Inefficient DRM
This commit is contained in:
Andrew D'Angelo
parent
56fc25d3cc
commit
3b8b23c9c5
831
sharp.c
831
sharp.c
@ -1,427 +1,506 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* DRM driver for 2.7" Sharp Memory LCD
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*
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* Copyright 2023 Andrew D'Angelo
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*/
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/property.h>
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#include <linux/sched/clock.h>
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#include <linux/spi/spi.h>
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#include <linux/kthread.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/time.h>
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#include <linux/timer.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_connector.h>
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#include <drm/drm_damage_helper.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fb_dma_helper.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_format_helper.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_gem_atomic_helper.h>
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#include <drm/drm_gem_dma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_rect.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_simple_kms_helper.h>
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#include <linux/fb.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/vmalloc.h>
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#define CMD_WRITE_LINE 0b10000000
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#define CMD_CLEAR_SCREEN 0b00100000
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#include <linux/gpio.h>
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#include <linux/uaccess.h>
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#define GPIO_DISP 22
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#define GPIO_SCS 8
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#define GPIO_VCOM 23
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#define LCDWIDTH 400
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#define VIDEOMEMSIZE (1*1024*1024) /* 1 MB */
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char commandByte = 0b10000000;
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char vcomByte = 0b01000000;
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char clearByte = 0b00100000;
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char paddingByte = 0b00000000;
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char DISP = 22;
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char SCS = 8;
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char VCOM = 23;
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int lcdWidth = LCDWIDTH;
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int lcdHeight = 240;
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int fpsCounter;
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static int seuil = 4; // Indispensable pour fbcon
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module_param(seuil, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP );
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char vcomState;
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unsigned char lineBuffer[LCDWIDTH/8];
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struct sharp {
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struct sharp_memory_panel {
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struct drm_device drm;
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struct drm_simple_display_pipe pipe;
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const struct drm_display_mode *mode;
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struct drm_connector connector;
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struct spi_device *spi;
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int id;
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char name[sizeof("sharp-3")];
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struct mutex mutex;
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struct work_struct work;
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spinlock_t lock;
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struct timer_list vcom_timer;
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unsigned int height;
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unsigned int width;
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};
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struct sharp *screen;
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struct fb_info *info;
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static void *videomemory;
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static u_long videomemorysize = VIDEOMEMSIZE;
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void vfb_fillrect(struct fb_info *p, const struct fb_fillrect *region);
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static int vfb_mmap(struct fb_info *info, struct vm_area_struct *vma);
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void sendLine(char *buffer, char lineNumber);
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static struct fb_var_screeninfo vfb_default = {
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.xres = 400,
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.yres = 240,
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.xres_virtual = 400,
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.yres_virtual = 240,
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.bits_per_pixel = 24,
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.grayscale = 1,
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.red = { 0, 8, 0 },
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.green = { 0, 8, 0 },
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.blue = { 0, 8, 0 },
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.activate = FB_ACTIVATE_NOW,
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.height = 400,
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.width = 240,
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.pixclock = 20000,
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.left_margin = 0,
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.right_margin = 0,
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.upper_margin = 0,
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.lower_margin = 0,
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.hsync_len = 128,
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.vsync_len = 128,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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static struct fb_fix_screeninfo vfb_fix = {
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.id = "Sharp FB",
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.type = FB_TYPE_PACKED_PIXELS,
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.line_length = 1200,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.visual = FB_VISUAL_MONO10,
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.accel = FB_ACCEL_NONE,
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};
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static struct fb_ops vfb_ops = {
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.fb_read = fb_sys_read,
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.fb_write = fb_sys_write,
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.fb_fillrect = sys_fillrect,
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.fb_copyarea = sys_copyarea,
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.fb_imageblit = sys_imageblit,
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.fb_mmap = vfb_mmap,
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};
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static struct task_struct *thread1;
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static struct task_struct *fpsThread;
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static struct task_struct *vcomToggleThread;
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static int vfb_mmap(struct fb_info *info,
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struct vm_area_struct *vma)
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static inline struct sharp_memory_panel *drm_to_panel(struct drm_device *drm)
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{
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unsigned long start = vma->vm_start;
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unsigned long size = vma->vm_end - vma->vm_start;
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
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unsigned long page, pos;
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printk(KERN_CRIT "start %ld size %ld offset %ld", start, size, offset);
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if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
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return -EINVAL;
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if (size > info->fix.smem_len)
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return -EINVAL;
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if (offset > info->fix.smem_len - size)
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return -EINVAL;
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pos = (unsigned long)info->fix.smem_start + offset;
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while (size > 0) {
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page = vmalloc_to_pfn((void *)pos);
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if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {
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return -EAGAIN;
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}
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start += PAGE_SIZE;
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pos += PAGE_SIZE;
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if (size > PAGE_SIZE)
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size -= PAGE_SIZE;
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else
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size = 0;
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return container_of(drm, struct sharp_memory_panel, drm);
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}
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return 0;
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}
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void vfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)
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static void vcom_timer_callback(struct timer_list *t)
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{
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printk(KERN_CRIT "from fillrect");
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static u8 vcom_setting = 0;
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struct sharp_memory_panel *panel = from_timer(panel, t, vcom_timer);
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// Toggle the GPIO pin
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vcom_setting = (vcom_setting) ? 0 : 1;
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gpio_set_value(GPIO_VCOM, vcom_setting);
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// Reschedule the timer
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mod_timer(&panel->vcom_timer, jiffies + msecs_to_jiffies(500));
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}
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static void *rvmalloc(unsigned long size)
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static int sharp_memory_spi_clear_screen(struct sharp_memory_panel *panel)
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{
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void *mem;
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unsigned long adr;
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struct spi_transfer tr[1] = {};
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int ret;
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u8 *command_buf;
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size = PAGE_ALIGN(size);
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mem = vmalloc_32(size);
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if (!mem)
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return NULL;
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memset(mem, 0, size); /* Clear the ram out, no junk to the user */
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adr = (unsigned long) mem;
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while (size > 0) {
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SetPageReserved(vmalloc_to_page((void *)adr));
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adr += PAGE_SIZE;
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size -= PAGE_SIZE;
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command_buf = kmalloc(2, GFP_KERNEL);
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if (!command_buf) {
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return -ENOMEM;
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}
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return mem;
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// Clear screen command and trailer
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command_buf[0] = CMD_CLEAR_SCREEN;
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command_buf[1] = 0;
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tr[0].tx_buf = command_buf;
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tr[0].len = 2;
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ndelay(80);
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gpio_set_value(GPIO_SCS, 1);
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ret = spi_sync_transfer(panel->spi, tr, 1);
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gpio_set_value(GPIO_SCS, 0);
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goto out_free;
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out_free:
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kfree(command_buf);
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return ret;
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}
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static void rvfree(void *mem, unsigned long size)
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static inline u8 sharp_memory_reverse_byte(u8 b)
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{
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unsigned long adr;
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if (!mem)
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return;
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adr = (unsigned long) mem;
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while ((long) size > 0) {
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ClearPageReserved(vmalloc_to_page((void *)adr));
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adr += PAGE_SIZE;
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size -= PAGE_SIZE;
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}
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vfree(mem);
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}
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void clearDisplay(void) {
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char buffer[2] = {clearByte, paddingByte};
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gpio_set_value(SCS, 1);
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spi_write(screen->spi, (const u8 *)buffer, 2);
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gpio_set_value(SCS, 0);
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}
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char reverseByte(char b) {
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b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
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b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
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b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
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return b;
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}
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int vcomToggleFunction(void* v)
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static int sharp_memory_spi_write_line(struct sharp_memory_panel *panel,
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size_t y, const void *line_data, size_t len)
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{
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while (!kthread_should_stop())
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{
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msleep(50);
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vcomState = vcomState ? 0:1;
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gpio_set_value(VCOM, vcomState);
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}
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return 0;
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}
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void *tx_buf = NULL;
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struct spi_transfer tr[3] = {};
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u8 *command_buf, *trailer_buf;
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int ret;
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int fpsThreadFunction(void* v)
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{
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while (!kthread_should_stop())
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{
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msleep(5000);
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printk(KERN_DEBUG "FPS sharp : %d\n", fpsCounter);
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fpsCounter = 0;
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}
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return 0;
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}
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int thread_fn(void* v)
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{
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//int i;
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int x,y,i;
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char pixel;
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char hasChanged = 0;
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unsigned char *screenBufferCompressed;
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char bufferByte = 0;
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char sendBuffer[1 + (1+50+1)*1 + 1];
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clearDisplay();
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//unsigned char *screenBufferCompressed;
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screenBufferCompressed = vzalloc((50+4)*240*sizeof(unsigned char)); //plante si on met moins
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//char bufferByte = 0;
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//char sendBuffer[1 + (1+50+1)*1 + 1];
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sendBuffer[0] = commandByte;
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sendBuffer[52] = paddingByte;
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sendBuffer[1 + 52] = paddingByte;
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// Init screen to black
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for(y=0 ; y < 240 ; y++)
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{
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gpio_set_value(SCS, 1);
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screenBufferCompressed[y*(50+4)] = commandByte;
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screenBufferCompressed[y*(50+4) + 1] = reverseByte(y+1); //sharp display lines are indexed from 1
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screenBufferCompressed[y*(50+4) + 52] = paddingByte;
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screenBufferCompressed[y*(50+4) + 53] = paddingByte;
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//screenBufferCompressed is all to 0 by default (vzalloc)
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spi_write(screen->spi, (const u8 *)(screenBufferCompressed+(y*(50+4))), 54);
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gpio_set_value(SCS, 0);
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}
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// Main loop
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while (!kthread_should_stop())
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{
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msleep(50);
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for(y=0 ; y < 240 ; y++)
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{
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hasChanged = 0;
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for(x=0 ; x<50 ; x++)
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{
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for(i=0 ; i<8 ; i++ )
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{
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pixel = ioread8((void*)((uintptr_t)info->fix.smem_start + (x*8 + y*400 + i)*3));
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if(pixel)
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{
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// passe le bit 7 - i a 1
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bufferByte |= (1 << (7 - i));
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}
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else
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{
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// passe le bit 7 - i a 0
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bufferByte &= ~(1 << (7 - i));
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}
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}
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if(!hasChanged && (screenBufferCompressed[x + 2 + y*(50+4)] != bufferByte))
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{
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hasChanged = 1;
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}
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screenBufferCompressed[x+2 + y*(50+4)] = bufferByte;
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}
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if(hasChanged)
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{
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gpio_set_value(SCS, 1);
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//la memoire allouee avec vzalloc semble trop lente...
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memcpy(sendBuffer, screenBufferCompressed+y*(50+4), 54);
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spi_write(screen->spi, (const u8 *)(sendBuffer), 54);
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gpio_set_value(SCS, 0);
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}
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}
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}
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return 0;
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}
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static int sharp_probe(struct spi_device *spi)
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{
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char our_thread[] = "updateScreen";
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char thread_vcom[] = "vcom";
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char thread_fps[] = "fpsThread";
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int retval;
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screen = devm_kzalloc(&spi->dev, sizeof(*screen), GFP_KERNEL);
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if (!screen)
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command_buf = kmalloc(2, GFP_KERNEL);
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if (!command_buf) {
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return -ENOMEM;
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}
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spi->bits_per_word = 8;
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spi->max_speed_hz = 2000000;
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trailer_buf = kzalloc(2, GFP_KERNEL);
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if (!trailer_buf) {
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return -ENOMEM;
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}
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screen->spi = spi;
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// Write line at line Y command
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command_buf[0] = CMD_WRITE_LINE;
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command_buf[1] = sharp_memory_reverse_byte((u8)(y + 1)); // Indexed from 1
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tr[0].tx_buf = command_buf;
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tr[0].len = 2;
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spi_set_drvdata(spi, screen);
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// Line data
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tx_buf = kmemdup(line_data, len, GFP_KERNEL);
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tr[1].tx_buf = tx_buf;
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tr[1].len = len;
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thread1 = kthread_create(thread_fn,NULL,our_thread);
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if((thread1))
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// Trailer
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tr[2].tx_buf = trailer_buf;
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tr[2].len = 2;
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ndelay(80);
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gpio_set_value(GPIO_SCS, 1);
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ret = spi_sync_transfer(panel->spi, tr, 3);
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gpio_set_value(GPIO_SCS, 0);
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goto out_free;
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out_free:
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kfree(trailer_buf);
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kfree(tx_buf);
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kfree(command_buf);
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return ret;
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}
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static void sharp_memory_gray8_to_mono_reversed(u8 *dst, u8 const *src,
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int line_width, struct drm_rect const* clip)
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{
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wake_up_process(thread1);
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#if 0
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u8 *gray8 = buf, *mono = buf;
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int y, xb, i;
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for (y = clip->y1; y < clip->y2; y++) {
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for (xb = clip->x1; xb < clip->x2; xb++) {
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u8 byte = 0x00;
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for (i = 0; i < 8; i++) {
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int x = xb * 8 + i;
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byte >>= 1;
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if (gray8[y * line_width + x] >> 7) {
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byte |= BIT(7);
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}
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}
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*mono++ = byte;
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}
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}
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#else
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int x, y, i;
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for (y = clip->y1; y < clip->y2; y++) {
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for (x = clip->x1; x < clip->x2; x++) {
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dst[(y * line_width + x) / 8] = 0;
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}
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for (x = clip->x1; x < clip->x2; x++) {
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if (src[y * line_width + x] & BIT(7)) {
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dst[(y * line_width + x) / 8] |= 0b10000000 >> (x % 8);
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}
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}
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}
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#endif
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}
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fpsThread = kthread_create(fpsThreadFunction,NULL,thread_fps);
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if((fpsThread))
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static int sharp_memory_fb_dirty(struct drm_framebuffer *fb,
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struct drm_rect const* dirty_rect)
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{
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wake_up_process(fpsThread);
|
||||
struct drm_gem_dma_object *dma_obj = drm_fb_dma_get_gem_obj(fb, 0);
|
||||
struct sharp_memory_panel *panel = drm_to_panel(fb->dev);
|
||||
unsigned int dst_pitch = 0;
|
||||
struct iosys_map dst, vmap;
|
||||
struct drm_rect clip;
|
||||
int idx, y, ret = 0;
|
||||
u8 *buf = NULL, *buf2 = NULL;
|
||||
|
||||
if (!drm_dev_enter(fb->dev, &idx)) {
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
vcomToggleThread = kthread_create(vcomToggleFunction,NULL,thread_vcom);
|
||||
if((vcomToggleThread))
|
||||
// Clip dirty region rows
|
||||
clip.x1 = 0;
|
||||
clip.x2 = fb->width;
|
||||
#if 0
|
||||
clip.y1 = dirty_rect->y1;
|
||||
clip.y2 = dirty_rect->y2;
|
||||
#else
|
||||
clip.y1 = 0;
|
||||
clip.y2 = fb->height;
|
||||
#endif
|
||||
|
||||
// buf is the size of the whole screen, but only the clip region
|
||||
// is copied from framebuffer
|
||||
//buf = kmalloc_array(fb->width, fb->height, GFP_KERNEL);
|
||||
buf = kmalloc(fb->width * fb->height, GFP_KERNEL);
|
||||
if (!buf) {
|
||||
ret = -ENOMEM;
|
||||
goto out_exit;
|
||||
}
|
||||
buf2 = kmalloc(panel->width * panel->height / 8, GFP_KERNEL);
|
||||
memset(buf, fb->width * fb->height, 0);
|
||||
memset(buf2, panel->width * panel->height / 8, 0);
|
||||
|
||||
ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
|
||||
if (ret) {
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
iosys_map_set_vaddr(&dst, buf);
|
||||
iosys_map_set_vaddr(&vmap, dma_obj->vaddr);
|
||||
drm_fb_xrgb8888_to_gray8(&dst, NULL, &vmap, fb, &clip);
|
||||
|
||||
drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
|
||||
|
||||
sharp_memory_gray8_to_mono_reversed(buf2, buf, fb->width, &clip);
|
||||
|
||||
for (y = clip.y1; y < clip.y2; y++) {
|
||||
sharp_memory_spi_write_line(panel, y,
|
||||
&buf2[(y * panel->width) / 8], panel->width / 8);
|
||||
}
|
||||
|
||||
out_free:
|
||||
kfree(buf2);
|
||||
kfree(buf);
|
||||
out_exit:
|
||||
drm_dev_exit(idx);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
static void power_off(struct sharp_memory_panel *panel)
|
||||
{
|
||||
wake_up_process(vcomToggleThread);
|
||||
printk(KERN_INFO "sharp_memory: powering off\n");
|
||||
|
||||
/* Turn off power and all signals */
|
||||
gpio_set_value(GPIO_SCS, 0);
|
||||
gpio_set_value(GPIO_DISP, 0);
|
||||
gpio_set_value(GPIO_VCOM, 0);
|
||||
}
|
||||
|
||||
gpio_request(SCS, "SCS");
|
||||
gpio_direction_output(SCS, 0);
|
||||
|
||||
gpio_request(VCOM, "VCOM");
|
||||
gpio_direction_output(VCOM, 0);
|
||||
|
||||
gpio_request(DISP, "DISP");
|
||||
gpio_direction_output(DISP, 1);
|
||||
|
||||
// SCREEN PART
|
||||
retval = -ENOMEM;
|
||||
|
||||
if (!(videomemory = rvmalloc(videomemorysize)))
|
||||
return retval;
|
||||
|
||||
memset(videomemory, 0, videomemorysize);
|
||||
|
||||
info = framebuffer_alloc(sizeof(u32) * 256, &spi->dev);
|
||||
if (!info)
|
||||
goto err;
|
||||
|
||||
info->screen_base = (char __iomem *)videomemory;
|
||||
info->fbops = &vfb_ops;
|
||||
|
||||
info->var = vfb_default;
|
||||
vfb_fix.smem_start = (unsigned long) videomemory;
|
||||
vfb_fix.smem_len = videomemorysize;
|
||||
info->fix = vfb_fix;
|
||||
info->par = NULL;
|
||||
info->flags = FBINFO_FLAG_DEFAULT;
|
||||
|
||||
retval = fb_alloc_cmap(&info->cmap, 16, 0);
|
||||
if (retval < 0)
|
||||
goto err1;
|
||||
|
||||
retval = register_framebuffer(info);
|
||||
if (retval < 0)
|
||||
goto err2;
|
||||
|
||||
fb_info(info, "Virtual frame buffer device, using %ldK of video memory\n",
|
||||
videomemorysize >> 10);
|
||||
return 0;
|
||||
err2:
|
||||
fb_dealloc_cmap(&info->cmap);
|
||||
err1:
|
||||
framebuffer_release(info);
|
||||
err:
|
||||
rvfree(videomemory, videomemorysize);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void sharp_remove(struct spi_device *spi)
|
||||
static void sharp_memory_pipe_enable(struct drm_simple_display_pipe *pipe,
|
||||
struct drm_crtc_state *crtc_state, struct drm_plane_state *plane_state)
|
||||
{
|
||||
if (info) {
|
||||
unregister_framebuffer(info);
|
||||
fb_dealloc_cmap(&info->cmap);
|
||||
framebuffer_release(info);
|
||||
}
|
||||
kthread_stop(thread1);
|
||||
kthread_stop(fpsThread);
|
||||
kthread_stop(vcomToggleThread);
|
||||
printk(KERN_CRIT "out of screen module");
|
||||
//return 0;
|
||||
printk(KERN_INFO "sharp_memory: entering sharp_memory_pipe_enable\n");
|
||||
|
||||
struct sharp_memory_panel *panel = drm_to_panel(pipe->crtc.dev);
|
||||
struct spi_device *spi = panel->spi;
|
||||
int idx;
|
||||
|
||||
if (!drm_dev_enter(pipe->crtc.dev, &idx)) {
|
||||
return;
|
||||
}
|
||||
|
||||
static struct spi_driver sharp_driver = {
|
||||
.probe = sharp_probe,
|
||||
.remove = sharp_remove,
|
||||
.driver = {
|
||||
.name = "sharp",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
/* Power up sequence */
|
||||
gpio_set_value(GPIO_SCS, 0);
|
||||
gpio_set_value(GPIO_DISP, 1);
|
||||
gpio_set_value(GPIO_VCOM, 0);
|
||||
usleep_range(5000, 10000);
|
||||
|
||||
// Clear display
|
||||
sharp_memory_spi_clear_screen(panel);
|
||||
|
||||
// Initialize and schedule the VCOM timer
|
||||
timer_setup(&panel->vcom_timer, vcom_timer_callback, 0);
|
||||
mod_timer(&panel->vcom_timer, jiffies + msecs_to_jiffies(500));
|
||||
|
||||
printk(KERN_INFO "sharp_memory: completed sharp_memory_pipe_enable\n");
|
||||
|
||||
out_exit:
|
||||
drm_dev_exit(idx);
|
||||
}
|
||||
|
||||
static void sharp_memory_pipe_disable(struct drm_simple_display_pipe *pipe)
|
||||
{
|
||||
printk(KERN_INFO "sharp_memory: sharp_memory_pipe_disable\n");
|
||||
|
||||
struct sharp_memory_panel *panel = drm_to_panel(pipe->crtc.dev);
|
||||
struct spi_device *spi = panel->spi;
|
||||
|
||||
// Cancel the timer
|
||||
del_timer_sync(&panel->vcom_timer);
|
||||
|
||||
power_off(panel);
|
||||
}
|
||||
|
||||
static void sharp_memory_pipe_update(struct drm_simple_display_pipe *pipe,
|
||||
struct drm_plane_state *old_state)
|
||||
{
|
||||
struct drm_plane_state *state = pipe->plane.state;
|
||||
struct drm_rect rect;
|
||||
int idx;
|
||||
|
||||
if (!pipe->crtc.state->active) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (drm_atomic_helper_damage_merged(old_state, state, &rect)) {
|
||||
sharp_memory_fb_dirty(state->fb, &rect);
|
||||
}
|
||||
}
|
||||
|
||||
static const struct drm_simple_display_pipe_funcs sharp_memory_pipe_funcs = {
|
||||
.enable = sharp_memory_pipe_enable,
|
||||
.disable = sharp_memory_pipe_disable,
|
||||
.update = sharp_memory_pipe_update,
|
||||
.prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
|
||||
};
|
||||
|
||||
module_spi_driver(sharp_driver);
|
||||
static int sharp_memory_connector_get_modes(struct drm_connector *connector)
|
||||
{
|
||||
struct sharp_memory_panel *panel = drm_to_panel(connector->dev);
|
||||
struct drm_display_mode *mode;
|
||||
|
||||
MODULE_AUTHOR("Ael Gain <ael.gain@free.fr>");
|
||||
MODULE_DESCRIPTION("Sharp memory lcd driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("spi:sharp");
|
||||
mode = drm_mode_duplicate(connector->dev, panel->mode);
|
||||
if (!mode) {
|
||||
DRM_ERROR("Failed to duplicate mode\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
drm_mode_set_name(mode);
|
||||
mode->type |= DRM_MODE_TYPE_PREFERRED;
|
||||
drm_mode_probed_add(connector, mode);
|
||||
|
||||
connector->display_info.width_mm = mode->width_mm;
|
||||
connector->display_info.height_mm = mode->height_mm;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static const struct drm_connector_helper_funcs sharp_memory_connector_hfuncs = {
|
||||
.get_modes = sharp_memory_connector_get_modes,
|
||||
};
|
||||
|
||||
static const struct drm_connector_funcs sharp_memory_connector_funcs = {
|
||||
.reset = drm_atomic_helper_connector_reset,
|
||||
.fill_modes = drm_helper_probe_single_connector_modes,
|
||||
.destroy = drm_connector_cleanup,
|
||||
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
|
||||
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
|
||||
};
|
||||
|
||||
static const struct drm_mode_config_funcs sharp_memory_mode_config_funcs = {
|
||||
.fb_create = drm_gem_fb_create_with_dirty,
|
||||
.atomic_check = drm_atomic_helper_check,
|
||||
.atomic_commit = drm_atomic_helper_commit,
|
||||
};
|
||||
|
||||
static const uint32_t sharp_memory_formats[] = {
|
||||
DRM_FORMAT_XRGB8888,
|
||||
};
|
||||
|
||||
static const struct drm_display_mode sharp_memory_ls027b7dh01_mode = {
|
||||
DRM_SIMPLE_MODE(400, 240, 59, 35),
|
||||
};
|
||||
|
||||
DEFINE_DRM_GEM_DMA_FOPS(sharp_memory_fops);
|
||||
|
||||
static const struct drm_driver sharp_memory_driver = {
|
||||
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
|
||||
.fops = &sharp_memory_fops,
|
||||
DRM_GEM_DMA_DRIVER_OPS_VMAP,
|
||||
.name = "sharp_memory",
|
||||
.desc = "Sharp Memory LCD panel",
|
||||
.date = "20230526",
|
||||
.major = 1,
|
||||
.minor = 0,
|
||||
};
|
||||
|
||||
static int sharp_memory_probe(struct spi_device *spi)
|
||||
{
|
||||
printk(KERN_INFO "sharp_memory: entering sharp_memory_probe\n");
|
||||
|
||||
const struct drm_display_mode *mode;
|
||||
struct device *dev = &spi->dev;
|
||||
struct sharp_memory_panel *panel;
|
||||
struct drm_device *drm;
|
||||
int ret;
|
||||
|
||||
/* The SPI device is used to allocate dma memory */
|
||||
if (!dev->coherent_dma_mask) {
|
||||
ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
|
||||
if (ret) {
|
||||
dev_warn(dev, "Failed to set dma mask %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
panel = devm_drm_dev_alloc(dev, &sharp_memory_driver,
|
||||
struct sharp_memory_panel, drm);
|
||||
if (IS_ERR(panel)) {
|
||||
printk(KERN_ERR "sharp_memory: failed to allocate panel\n");
|
||||
return PTR_ERR(panel);
|
||||
}
|
||||
|
||||
drm = &panel->drm;
|
||||
|
||||
ret = drmm_mode_config_init(drm);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
drm->mode_config.funcs = &sharp_memory_mode_config_funcs;
|
||||
|
||||
panel->spi = spi;
|
||||
|
||||
mode = &sharp_memory_ls027b7dh01_mode;
|
||||
panel->mode = mode;
|
||||
panel->width = mode->hdisplay;
|
||||
panel->height = mode->vdisplay;
|
||||
|
||||
drm->mode_config.min_width = mode->hdisplay;
|
||||
drm->mode_config.max_width = mode->hdisplay;
|
||||
drm->mode_config.min_height = mode->vdisplay;
|
||||
drm->mode_config.max_height = mode->vdisplay;
|
||||
|
||||
drm_connector_helper_add(&panel->connector, &sharp_memory_connector_hfuncs);
|
||||
ret = drm_connector_init(drm, &panel->connector, &sharp_memory_connector_funcs,
|
||||
DRM_MODE_CONNECTOR_SPI);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = drm_simple_display_pipe_init(drm, &panel->pipe, &sharp_memory_pipe_funcs,
|
||||
sharp_memory_formats, ARRAY_SIZE(sharp_memory_formats),
|
||||
NULL, &panel->connector);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
drm_mode_config_reset(drm);
|
||||
|
||||
printk(KERN_INFO "sharp_memory: registering DRM device\n");
|
||||
|
||||
ret = drm_dev_register(drm, 0);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
spi_set_drvdata(spi, drm);
|
||||
drm_fbdev_generic_setup(drm, 0);
|
||||
|
||||
printk(KERN_INFO "sharp_memory: successful probe\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void sharp_memory_remove(struct spi_device *spi)
|
||||
{
|
||||
printk(KERN_DEBUG "sharp_memory: entered sharp_memory_remove\n");
|
||||
struct drm_device *drm = spi_get_drvdata(spi);
|
||||
printk(KERN_DEBUG "sharp_memory: completed spi_get_drvdata\n");
|
||||
struct sharp_memory_panel *panel = drm_to_panel(drm);
|
||||
printk(KERN_DEBUG "sharp_memory: completed drm_to_panel\n");
|
||||
|
||||
drm_dev_unplug(drm);
|
||||
printk(KERN_DEBUG "sharp_memory: completed drm_dev_unplug\n");
|
||||
drm_atomic_helper_shutdown(drm);
|
||||
printk(KERN_DEBUG "sharp_memory: completed drm_atomic_helper_shutdown\n");
|
||||
}
|
||||
|
||||
static void sharp_memory_shutdown(struct spi_device *spi)
|
||||
{
|
||||
drm_atomic_helper_shutdown(spi_get_drvdata(spi));
|
||||
}
|
||||
|
||||
static struct spi_driver sharp_memory_spi_driver = {
|
||||
.driver = {
|
||||
.name = "sharp",
|
||||
},
|
||||
.probe = sharp_memory_probe,
|
||||
.remove = sharp_memory_remove,
|
||||
.shutdown = sharp_memory_shutdown,
|
||||
};
|
||||
module_spi_driver(sharp_memory_spi_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Sharp Memory LCD DRM driver");
|
||||
MODULE_AUTHOR("Andrew D'Angelo");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user