drm: add st7586 driver for Sharp Brain 2nd generation SubLCD
This commit is contained in:
Suguru Saito
Takumi Sueda
parent
a76c481de1
commit
30f2bc6cf9
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@ -0,0 +1,443 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* DRM driver for Sitronix ST7586 panels for Brain 2nd SubLCD
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*
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* Copyright 2021 Suguru Saito <sg.sgch07@gmail.com>
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*
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* based on st7586.c
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* Copyright 2017 David Lechner <david@lechnology.com>
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*/
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#include <linux/delay.h>
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#include <linux/dma-buf.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/spi/spi.h>
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#include <video/mipi_display.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_format_helper.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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/* controller-specific commands */
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#define ST7586_DISP_MODE_GRAY 0x38
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#define ST7586_DISP_MODE_MONO 0x39
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#define ST7586_ENABLE_DDRAM 0x3a
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#define ST7586_SET_DISP_DUTY 0xb0
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#define ST7586_SET_OUTPUT_COM 0xb1
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#define ST7586_SET_PART_DISP 0xb4
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#define ST7586_SET_NLINE_INV 0xb5
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#define ST7586_SET_VOP 0xc0
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#define ST7586_SET_BIAS_SYSTEM 0xc3
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#define ST7586_SET_BOOST_LEVEL 0xc4
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#define ST7586_SET_VOP_OFFSET 0xc7
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#define ST7586_ENABLE_ANALOG 0xd0
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#define ST7586_AUTO_READ_CTRL 0xd7
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#define ST7586_OTP_RW_CTRL 0xe0
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#define ST7586_OTP_CTRL_OUT 0xe1
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#define ST7586_OTP_READ 0xe3
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#define ST7586_DISP_CTRL_MX BIT(6)
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#define ST7586_DISP_CTRL_MY BIT(7)
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#define BRAIN_PAGE_OFFSET 0x28
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/*
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* The ST7586 controller has an unusual pixel format where 2bpp grayscale is
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* packed 3 pixels per byte with the first two pixels using 3 bits and the 3rd
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* pixel using only 2 bits.
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*
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* | D7 | D6 | D5 || | || 2bpp |
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* | (D4) | (D3) | (D2) || D1 | D0 || GRAY |
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* +------+------+------++------+------++------+
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* | 1 | 1 | 1 || 1 | 1 || 0 0 | black
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* | 1 | 0 | 0 || 1 | 0 || 0 1 | dark gray
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* | 0 | 1 | 0 || 0 | 1 || 1 0 | light gray
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* | 0 | 0 | 0 || 0 | 0 || 1 1 | white
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*/
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static const u8 st7586_lookup[] = { 0x7, 0x4, 0x2, 0x0 };
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static void st7586_xrgb8888_to_gray332_word(u16 *dst, void *vaddr,
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struct drm_framebuffer *fb,
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struct drm_rect *clip)
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{
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size_t len = (clip->x2 - clip->x1) * (clip->y2 - clip->y1);
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unsigned int x, y;
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u8 *src, *buf;
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u16 packed;
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buf = kmalloc(len, GFP_KERNEL);
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if (!buf)
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return;
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drm_fb_xrgb8888_to_gray8(buf, vaddr, fb, clip);
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src = buf;
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for (y = clip->y1; y < clip->y2; y++) {
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for (x = clip->x1; x < clip->x2; x += 3*2) {
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/*
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* buf: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, ...
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* dst: 210543, 876ba9, ...
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*/
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packed = (st7586_lookup[*src++ >> 6] & 0x03) << 8;
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packed |= st7586_lookup[*src++ >> 6] << 10;
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packed |= st7586_lookup[*src++ >> 6] << 13;
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packed |= (st7586_lookup[*src++ >> 6] & 0x03) << 0;
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packed |= st7586_lookup[*src++ >> 6] << 2;
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packed |= st7586_lookup[*src++ >> 6] << 5;
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*dst++ = packed;
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}
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}
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kfree(buf);
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}
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static int st7586_buf_copy(void *dst, struct drm_framebuffer *fb,
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struct drm_rect *clip)
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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 dma_buf_attachment *import_attach = cma_obj->base.import_attach;
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void *src = cma_obj->vaddr;
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int ret = 0;
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if (import_attach) {
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ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
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DMA_FROM_DEVICE);
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if (ret)
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return ret;
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}
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st7586_xrgb8888_to_gray332_word(dst, src, fb, clip);
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if (import_attach)
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ret = dma_buf_end_cpu_access(import_attach->dmabuf,
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DMA_FROM_DEVICE);
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return ret;
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}
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static void st7586_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
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{
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struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev);
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struct mipi_dbi *dbi = &dbidev->dbi;
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int start_col, end_col, start_page, end_page, len, idx, ret = 0;
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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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/* 3 pixels per byte, so grow clip to nearest multiple of 3 */
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rect->x1 = rounddown(rect->x1, 3);
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rect->x2 = roundup(rect->x2, 3);
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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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ret = st7586_buf_copy(dbidev->tx_buf, fb, rect);
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if (ret)
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goto err_msg;
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/* Pixels are packed 3 per byte */
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start_col = rect->x1 / 3;
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end_col = rect->x2 / 3;
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len = (end_col - start_col) * (rect->y2 - rect->y1) / 2;
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/* Write to top-side DDRAM */
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start_page = rect->y1 + BRAIN_PAGE_OFFSET;
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end_page = (rect->y2 - rect->y1) / 2 + BRAIN_PAGE_OFFSET;
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mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS,
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(start_col >> 8) & 0xFF, start_col & 0xFF,
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(end_col >> 8) & 0xFF, (end_col - 1) & 0xFF);
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mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS,
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(start_page >> 8) & 0xFF, start_page & 0xFF,
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(end_page >> 8) & 0xFF, (end_page - 1) & 0xFF);
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ret = mipi_dbi_command_buf(dbi, MIPI_DCS_WRITE_MEMORY_START,
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(u8 *)dbidev->tx_buf, len);
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if (ret)
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goto err_msg;
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/* Write to bottom-side DDRAM */
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start_page = (rect->y2 - rect->y1) / 2 + BRAIN_PAGE_OFFSET;
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end_page = rect->y2 + BRAIN_PAGE_OFFSET;
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mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS,
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(start_col >> 8) & 0xFF, start_col & 0xFF,
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(end_col >> 8) & 0xFF, (end_col - 1) & 0xFF);
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mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS,
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(start_page >> 8) & 0xFF, start_page & 0xFF,
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(end_page >> 8) & 0xFF, (end_page - 1) & 0xFF);
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ret = mipi_dbi_command_buf(dbi, MIPI_DCS_WRITE_MEMORY_START,
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((u8 *)dbidev->tx_buf) + len, len);
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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 st7586_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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st7586_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 void st7586_pipe_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 drm_framebuffer *fb = plane_state->fb;
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struct mipi_dbi *dbi = &dbidev->dbi;
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struct drm_rect rect = {
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.x1 = 0,
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.x2 = fb->width,
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.y1 = 0,
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.y2 = fb->height,
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};
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int idx, ret;
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u8 addr_mode;
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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_reset(dbidev);
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if (ret)
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goto out_exit;
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mipi_dbi_command(dbi, ST7586_AUTO_READ_CTRL, 0x9f);
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mipi_dbi_command(dbi, ST7586_OTP_RW_CTRL, 0x00);
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msleep(10);
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mipi_dbi_command(dbi, ST7586_OTP_READ);
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msleep(20);
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mipi_dbi_command(dbi, ST7586_OTP_CTRL_OUT);
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mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
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msleep(50);
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mipi_dbi_command(dbi, ST7586_SET_VOP_OFFSET, 0x00);
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mipi_dbi_command(dbi, ST7586_SET_VOP, 0x19, 0x01);
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mipi_dbi_command(dbi, ST7586_SET_BIAS_SYSTEM, 0x03);
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mipi_dbi_command(dbi, ST7586_SET_BOOST_LEVEL, 0x07);
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mipi_dbi_command(dbi, ST7586_ENABLE_ANALOG, 0x1d);
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mipi_dbi_command(dbi, ST7586_SET_NLINE_INV, 0x00);
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mipi_dbi_command(dbi, ST7586_DISP_MODE_GRAY);
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mipi_dbi_command(dbi, ST7586_ENABLE_DDRAM, 0x02);
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switch (dbidev->rotation) {
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default:
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addr_mode = 0x00;
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break;
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case 90:
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addr_mode = ST7586_DISP_CTRL_MY;
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break;
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case 180:
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addr_mode = ST7586_DISP_CTRL_MX | ST7586_DISP_CTRL_MY;
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break;
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case 270:
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addr_mode = ST7586_DISP_CTRL_MX;
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break;
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}
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mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
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mipi_dbi_command(dbi, ST7586_SET_DISP_DUTY, 0x77);
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mipi_dbi_command(dbi, ST7586_SET_OUTPUT_COM, BRAIN_PAGE_OFFSET);
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mipi_dbi_command(dbi, ST7586_SET_PART_DISP, 0xa0);
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mipi_dbi_command(dbi, MIPI_DCS_SET_PARTIAL_AREA, 0x00, 0x00, 0x00, 0x9f);
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mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);
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msleep(100);
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dbidev->enabled = true;
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st7586_fb_dirty(fb, &rect);
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
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out_exit:
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drm_dev_exit(idx);
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}
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static void st7586_pipe_disable(struct drm_simple_display_pipe *pipe)
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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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/*
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* This callback is not protected by drm_dev_enter/exit since we want to
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* turn off the display on regular driver unload. It's highly unlikely
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* that the underlying SPI controller is gone should this be called after
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* unplug.
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*/
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DRM_DEBUG_KMS("\n");
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if (!dbidev->enabled)
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return;
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mipi_dbi_command(&dbidev->dbi, MIPI_DCS_SET_DISPLAY_OFF);
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dbidev->enabled = false;
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}
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static const u32 st7586_formats[] = {
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DRM_FORMAT_XRGB8888,
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};
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static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = {
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.enable = st7586_pipe_enable,
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.disable = st7586_pipe_disable,
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.update = st7586_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 const struct drm_display_mode st7586_mode = {
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DRM_SIMPLE_MODE(240, 120, 51, 26),
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};
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DEFINE_DRM_GEM_CMA_FOPS(st7586_fops);
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static struct drm_driver st7586_driver = {
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.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
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.fops = &st7586_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 = "brain-st7586",
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.desc = "Sitronix ST7586 for Sharp Brain 2nd generation SubLCD",
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.date = "20211002",
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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 st7586_of_match[] = {
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{ .compatible = "brain,st7586" },
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{},
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};
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MODULE_DEVICE_TABLE(of, st7586_of_match);
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static const struct spi_device_id st7586_id[] = {
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{ "brain-slcd", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(spi, st7586_id);
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static int st7586_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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u32 rotation = 0;
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size_t bufsize;
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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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dbi = &dbidev->dbi;
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drm = &dbidev->drm;
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ret = devm_drm_dev_init(dev, drm, &st7586_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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bufsize = (st7586_mode.vdisplay + 2) / 3 * st7586_mode.hdisplay;
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dbi->reset = devm_gpiod_get(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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device_property_read_u32(dev, "rotation", &rotation);
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ret = mipi_dbi_spi_init(spi, dbi, NULL);
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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_with_formats(dbidev, &st7586_pipe_funcs,
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st7586_formats, ARRAY_SIZE(st7586_formats),
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&st7586_mode, rotation, bufsize);
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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 st7586_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 st7586_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 struct spi_driver st7586_spi_driver = {
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.driver = {
|
||||
.name = "brain-st7586",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = st7586_of_match,
|
||||
},
|
||||
.id_table = st7586_id,
|
||||
.probe = st7586_probe,
|
||||
.remove = st7586_remove,
|
||||
.shutdown = st7586_shutdown,
|
||||
};
|
||||
module_spi_driver(st7586_spi_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Sitronix ST7586 DRM driver for Sharp Brain 2nd generation SubLCD");
|
||||
MODULE_AUTHOR("Suguru Saito <sg.sgch07@gmail.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue