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408 lines
11 KiB
408 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* DRM driver for ST7789V panels with flexible config
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*
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* Copyright 2019 Limor Fried
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* Copyright 2016 Noralf Trønnes
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#include <drm/drm_atomic_helper.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_cma_helper.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_mipi_dbi.h>
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#include <drm/drm_rect.h>
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#include <drm/drm_vblank.h>
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#include <drm/drm_modeset_helper.h>
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#include <video/mipi_display.h>
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#define ST77XX_MADCTL_MY 0x80
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#define ST77XX_MADCTL_MX 0x40
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#define ST77XX_MADCTL_MV 0x20
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#define ST77XX_MADCTL_ML 0x10
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#define ST77XX_MADCTL_BGR 0x08
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#define ST77XX_MADCTL_RGB 0x00
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static u32 col_offset = 0;
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static u32 row_offset = 0;
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static u8 col_hack_fix_offset = 0;
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static short x_offset = 0;
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static short y_offset = 0;
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static void st7789vada_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
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{
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struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
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struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev);
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unsigned int height = rect->y2 - rect->y1;
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unsigned int width = rect->x2 - rect->x1;
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struct mipi_dbi *dbi = &dbidev->dbi;
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bool swap = dbi->swap_bytes;
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u16 x1, x2, y1, y2;
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int idx, ret = 0;
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bool full;
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void *tr;
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if (!dbidev->enabled)
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return;
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if (!drm_dev_enter(fb->dev, &idx))
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return;
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full = width == fb->width && height == fb->height;
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DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
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if (!dbi->dc || !full || swap ||
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fb->format->format == DRM_FORMAT_XRGB8888) {
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tr = dbidev->tx_buf;
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ret = mipi_dbi_buf_copy(dbidev->tx_buf, fb, rect, swap);
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if (ret)
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goto err_msg;
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} else {
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tr = cma_obj->vaddr;
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}
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x1 = rect->x1 + x_offset;
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x2 = rect->x2 - 1 + x_offset;
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y1 = rect->y1 + y_offset;
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y2 = rect->y2 - 1 + y_offset;
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//printk(KERN_INFO "setaddrwin (%d, %d) -> (%d, %d) offsets: %d & %d \n", x1, y1, x2, y2, x_offset, y_offset);
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mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS,
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(x1 >> 8) & 0xFF, x1 & 0xFF,
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(x2 >> 8) & 0xFF, x2 & 0xFF);
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mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS,
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(y1 >> 8) & 0xFF, y1 & 0xFF,
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(y2 >> 8) & 0xFF, y2 & 0xFF);
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ret = mipi_dbi_command_buf(dbi, MIPI_DCS_WRITE_MEMORY_START, tr,
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width*height * 2);
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err_msg:
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if (ret)
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dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
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drm_dev_exit(idx);
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}
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static void st7789vada_pipe_update(struct drm_simple_display_pipe *pipe,
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struct drm_plane_state *old_state)
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{
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struct drm_plane_state *state = pipe->plane.state;
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struct drm_crtc *crtc = &pipe->crtc;
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struct drm_rect rect;
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if (drm_atomic_helper_damage_merged(old_state, state, &rect))
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st7789vada_fb_dirty(state->fb, &rect);
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if (crtc->state->event) {
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spin_lock_irq(&crtc->dev->event_lock);
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drm_crtc_send_vblank_event(crtc, crtc->state->event);
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spin_unlock_irq(&crtc->dev->event_lock);
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crtc->state->event = NULL;
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}
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}
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static struct drm_display_mode st7789vada_mode = {
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DRM_SIMPLE_MODE(240, 320, 58, 43),
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};
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DEFINE_DRM_GEM_CMA_FOPS(st7789vada_fops);
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static struct drm_driver st7789vada_driver = {
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.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
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.fops = &st7789vada_fops,
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.release = mipi_dbi_release,
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DRM_GEM_CMA_VMAP_DRIVER_OPS,
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.debugfs_init = mipi_dbi_debugfs_init,
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.name = "st7789vada",
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.desc = "ST7789V Adafruit",
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.date = "20200727",
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.major = 1,
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.minor = 0,
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};
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static const struct of_device_id st7789vada_of_match[] = {
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{ .compatible = "multi-inno,mi0283qt" },
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{},
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};
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MODULE_DEVICE_TABLE(of, st7789vada_of_match);
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static const struct spi_device_id st7789vada_id[] = {
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{ "st7789vada", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(spi, st7789vada_id);
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static void st7789vada_enable(struct drm_simple_display_pipe *pipe,
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struct drm_crtc_state *crtc_state,
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struct drm_plane_state *plane_state)
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{
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struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
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struct mipi_dbi *dbi = &dbidev->dbi;
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u8 addr_mode;
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u16 width = st7789vada_mode.htotal;
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u16 height = st7789vada_mode.vtotal;
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int ret, idx;
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//printk(KERN_INFO "w/h %d %d\n", width, height);
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if (!drm_dev_enter(pipe->crtc.dev, &idx))
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return;
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DRM_DEBUG_KMS("\n");
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ret = mipi_dbi_poweron_conditional_reset(dbidev);
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if (ret < 0)
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goto out_exit;
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if (ret == 1)
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goto out_enable;
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
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mipi_dbi_command(dbi, MIPI_DCS_SOFT_RESET);
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msleep(150);
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mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
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msleep(10);
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mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); // 16 bit color
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msleep(10);
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mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, 0);
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mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS, 0, 0, 0, 240);
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mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS, 0, 0, 320>>8, 320&0xFF);
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mipi_dbi_command(dbi, MIPI_DCS_ENTER_INVERT_MODE); // odd hack, displays are inverted
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mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);
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msleep(10);
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
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msleep(10);
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out_enable:
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/* The PiTFT has a hardware reset circuit that
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* resets only on power-on and not on each reboot through
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* a gpio like the rpi-display does.
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* As a result, we need to always apply the rotation value
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* regardless of the display "on/off" state.
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*/
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switch (dbidev->rotation) {
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default:
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addr_mode = 0;
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x_offset = col_offset;
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y_offset = row_offset;
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break;
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case 90:
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addr_mode = ST77XX_MADCTL_MV | ST77XX_MADCTL_MX;
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x_offset = row_offset;
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y_offset = col_offset;
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break;
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case 180:
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addr_mode = ST77XX_MADCTL_MX | ST77XX_MADCTL_MY;
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x_offset = (240 - width) - col_offset + col_hack_fix_offset;
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// hack tweak to account for extra pixel width to make even
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y_offset = (320 - height) - row_offset;
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break;
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case 270:
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addr_mode = ST77XX_MADCTL_MV | ST77XX_MADCTL_MY;
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x_offset = (320 - height) - row_offset;
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y_offset = (240 - width) - col_offset;
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break;
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}
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//printk(KERN_INFO "Rotation offsets %d %d\n", x_offset, y_offset);
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mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
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mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
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out_exit:
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drm_dev_exit(idx);
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}
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static const struct drm_simple_display_pipe_funcs st7789vada_pipe_funcs = {
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.enable = st7789vada_enable,
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.disable = mipi_dbi_pipe_disable,
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.update = st7789vada_pipe_update,
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.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
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};
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static int st7789vada_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct mipi_dbi_dev *dbidev;
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struct drm_device *drm;
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struct mipi_dbi *dbi;
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struct gpio_desc *dc;
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u32 rotation = 0;
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u32 width = 240;
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u32 height = 320;
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int ret;
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dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
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if (!dbidev)
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return -ENOMEM;
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//printk(KERN_INFO "ST7789 fake driver\n");
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dbi = &dbidev->dbi;
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drm = &dbidev->drm;
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ret = devm_drm_dev_init(dev, drm, &st7789vada_driver);
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if (ret) {
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kfree(dbidev);
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return ret;
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}
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drm_mode_config_init(drm);
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dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(dbi->reset)) {
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DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
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return PTR_ERR(dbi->reset);
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}
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dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
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if (IS_ERR(dc)) {
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DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
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return PTR_ERR(dc);
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}
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dbidev->regulator = devm_regulator_get(dev, "power");
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if (IS_ERR(dbidev->regulator))
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return PTR_ERR(dbidev->regulator);
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dbidev->backlight = devm_of_find_backlight(dev);
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if (IS_ERR(dbidev->backlight))
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return PTR_ERR(dbidev->backlight);
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device_property_read_u32(dev, "rotation", &rotation);
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//printk(KERN_INFO "Rotation %d\n", rotation);
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device_property_read_u32(dev, "width", &width);
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if (width % 2) {
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width +=1; // odd width will cause a kernel panic
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col_hack_fix_offset = 3;
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} else {
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col_hack_fix_offset = 0;
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}
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//printk(KERN_INFO "Width %d\n", width);
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if ((width == 0) || (width > 240)) {
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width = 240; // default to full framebuff;
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}
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device_property_read_u32(dev, "height", &height);
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//printk(KERN_INFO "Height %d\n", height);
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if ((height == 0) || (height > 320)) {
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height = 320; // default to full framebuff;
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}
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st7789vada_mode.hdisplay = st7789vada_mode.hsync_start =
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st7789vada_mode.hsync_end = st7789vada_mode.htotal = width;
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st7789vada_mode.vdisplay = st7789vada_mode.vsync_start =
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st7789vada_mode.vsync_end = st7789vada_mode.vtotal = height;
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device_property_read_u32(dev, "col_offset", &col_offset);
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//printk(KERN_INFO "Column offset %d\n", col_offset);
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device_property_read_u32(dev, "row_offset", &row_offset);
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//printk(KERN_INFO "Row offset %d\n", row_offset);
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ret = mipi_dbi_spi_init(spi, dbi, dc);
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if (ret)
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return ret;
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/* Cannot read from this controller via SPI */
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dbi->read_commands = NULL;
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ret = mipi_dbi_dev_init(dbidev, &st7789vada_pipe_funcs, &st7789vada_mode, rotation);
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if (ret)
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return ret;
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drm_mode_config_reset(drm);
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ret = drm_dev_register(drm, 0);
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if (ret)
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return ret;
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spi_set_drvdata(spi, drm);
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drm_fbdev_generic_setup(drm, 0);
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return 0;
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}
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static int st7789vada_remove(struct spi_device *spi)
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{
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struct drm_device *drm = spi_get_drvdata(spi);
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drm_dev_unplug(drm);
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drm_atomic_helper_shutdown(drm);
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return 0;
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}
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static void st7789vada_shutdown(struct spi_device *spi)
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{
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drm_atomic_helper_shutdown(spi_get_drvdata(spi));
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}
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static int __maybe_unused st7789vada_pm_suspend(struct device *dev)
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{
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return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
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}
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static int __maybe_unused st7789vada_pm_resume(struct device *dev)
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{
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drm_mode_config_helper_resume(dev_get_drvdata(dev));
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return 0;
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}
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static const struct dev_pm_ops st7789vada_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(st7789vada_pm_suspend, st7789vada_pm_resume)
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};
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static struct spi_driver st7789vada_spi_driver = {
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.driver = {
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.name = "st7789vada",
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.owner = THIS_MODULE,
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.of_match_table = st7789vada_of_match,
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.pm = &st7789vada_pm_ops,
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},
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.id_table = st7789vada_id,
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.probe = st7789vada_probe,
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.remove = st7789vada_remove,
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.shutdown = st7789vada_shutdown,
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};
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module_spi_driver(st7789vada_spi_driver);
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MODULE_DESCRIPTION("Sitronix ST7789V Flexible DRM driver");
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MODULE_AUTHOR("Noralf Trønnes + Limor Fried");
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MODULE_LICENSE("GPL");
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