[mirror_ubuntu-focal-kernel.git] / drivers / gpu / drm / tinydrm / st7586.c

/*
 * DRM driver for Sitronix ST7586 panels
 *
 * Copyright 2017 David Lechner <david@lechnology.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/delay.h>
#include <linux/dma-buf.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_rect.h>
#include <drm/drm_vblank.h>
#include <drm/tinydrm/mipi-dbi.h>
#include <drm/tinydrm/tinydrm-helpers.h>

/* controller-specific commands */
#define ST7586_DISP_MODE_GRAY	0x38
#define ST7586_DISP_MODE_MONO	0x39
#define ST7586_ENABLE_DDRAM	0x3a
#define ST7586_SET_DISP_DUTY	0xb0
#define ST7586_SET_PART_DISP	0xb4
#define ST7586_SET_NLINE_INV	0xb5
#define ST7586_SET_VOP		0xc0
#define ST7586_SET_BIAS_SYSTEM	0xc3
#define ST7586_SET_BOOST_LEVEL	0xc4
#define ST7586_SET_VOP_OFFSET	0xc7
#define ST7586_ENABLE_ANALOG	0xd0
#define ST7586_AUTO_READ_CTRL	0xd7
#define ST7586_OTP_RW_CTRL	0xe0
#define ST7586_OTP_CTRL_OUT	0xe1
#define ST7586_OTP_READ		0xe3

#define ST7586_DISP_CTRL_MX	BIT(6)
#define ST7586_DISP_CTRL_MY	BIT(7)

/*
 * The ST7586 controller has an unusual pixel format where 2bpp grayscale is
 * packed 3 pixels per byte with the first two pixels using 3 bits and the 3rd
 * pixel using only 2 bits.
 *
 * |  D7  |  D6  |  D5  ||      |      || 2bpp |
 * | (D4) | (D3) | (D2) ||  D1  |  D0  || GRAY |
 * +------+------+------++------+------++------+
 * |  1   |  1   |  1   ||  1   |  1   || 0  0 | black
 * |  1   |  0   |  0   ||  1   |  0   || 0  1 | dark gray
 * |  0   |  1   |  0   ||  0   |  1   || 1  0 | light gray
 * |  0   |  0   |  0   ||  0   |  0   || 1  1 | white
 */

static const u8 st7586_lookup[] = { 0x7, 0x4, 0x2, 0x0 };

static void st7586_xrgb8888_to_gray332(u8 *dst, void *vaddr,
				       struct drm_framebuffer *fb,
				       struct drm_rect *clip)
{
	size_t len = (clip->x2 - clip->x1) * (clip->y2 - clip->y1);
	unsigned int x, y;
	u8 *src, *buf, val;

	buf = kmalloc(len, GFP_KERNEL);
	if (!buf)
		return;

	tinydrm_xrgb8888_to_gray8(buf, vaddr, fb, clip);
	src = buf;

	for (y = clip->y1; y < clip->y2; y++) {
		for (x = clip->x1; x < clip->x2; x += 3) {
			val = st7586_lookup[*src++ >> 6] << 5;
			val |= st7586_lookup[*src++ >> 6] << 2;
			val |= st7586_lookup[*src++ >> 6] >> 1;
			*dst++ = val;
		}
	}

	kfree(buf);
}

static int st7586_buf_copy(void *dst, struct drm_framebuffer *fb,
			   struct drm_rect *clip)
{
	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
	void *src = cma_obj->vaddr;
	int ret = 0;

	if (import_attach) {
		ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
					       DMA_FROM_DEVICE);
		if (ret)
			return ret;
	}

	st7586_xrgb8888_to_gray332(dst, src, fb, clip);

	if (import_attach)
		ret = dma_buf_end_cpu_access(import_attach->dmabuf,
					     DMA_FROM_DEVICE);

	return ret;
}

static void st7586_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
{
	struct tinydrm_device *tdev = fb->dev->dev_private;
	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
	int start, end;
	int ret = 0;

	if (!mipi->enabled)
		return;

	/* 3 pixels per byte, so grow clip to nearest multiple of 3 */
	rect->x1 = rounddown(rect->x1, 3);
	rect->x2 = roundup(rect->x2, 3);

	DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));

	ret = st7586_buf_copy(mipi->tx_buf, fb, rect);
	if (ret)
		goto err_msg;

	/* Pixels are packed 3 per byte */
	start = rect->x1 / 3;
	end = rect->x2 / 3;

	mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS,
			 (start >> 8) & 0xFF, start & 0xFF,
			 (end >> 8) & 0xFF, (end - 1) & 0xFF);
	mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS,
			 (rect->y1 >> 8) & 0xFF, rect->y1 & 0xFF,
			 (rect->y2 >> 8) & 0xFF, (rect->y2 - 1) & 0xFF);

	ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START,
				   (u8 *)mipi->tx_buf,
				   (end - start) * (rect->y2 - rect->y1));
err_msg:
	if (ret)
		dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
}

static void st7586_pipe_update(struct drm_simple_display_pipe *pipe,
			       struct drm_plane_state *old_state)
{
	struct drm_plane_state *state = pipe->plane.state;
	struct drm_crtc *crtc = &pipe->crtc;
	struct drm_rect rect;

	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
		st7586_fb_dirty(state->fb, &rect);

	if (crtc->state->event) {
		spin_lock_irq(&crtc->dev->event_lock);
		drm_crtc_send_vblank_event(crtc, crtc->state->event);
		spin_unlock_irq(&crtc->dev->event_lock);
		crtc->state->event = NULL;
	}
}

static void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
			       struct drm_crtc_state *crtc_state,
			       struct drm_plane_state *plane_state)
{
	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
	struct drm_framebuffer *fb = plane_state->fb;
	struct drm_rect rect = {
		.x1 = 0,
		.x2 = fb->width,
		.y1 = 0,
		.y2 = fb->height,
	};
	int ret;
	u8 addr_mode;

	DRM_DEBUG_KMS("\n");

	ret = mipi_dbi_poweron_reset(mipi);
	if (ret)
		return;

	mipi_dbi_command(mipi, ST7586_AUTO_READ_CTRL, 0x9f);
	mipi_dbi_command(mipi, ST7586_OTP_RW_CTRL, 0x00);

	msleep(10);

	mipi_dbi_command(mipi, ST7586_OTP_READ);

	msleep(20);

	mipi_dbi_command(mipi, ST7586_OTP_CTRL_OUT);
	mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);

	msleep(50);

	mipi_dbi_command(mipi, ST7586_SET_VOP_OFFSET, 0x00);
	mipi_dbi_command(mipi, ST7586_SET_VOP, 0xe3, 0x00);
	mipi_dbi_command(mipi, ST7586_SET_BIAS_SYSTEM, 0x02);
	mipi_dbi_command(mipi, ST7586_SET_BOOST_LEVEL, 0x04);
	mipi_dbi_command(mipi, ST7586_ENABLE_ANALOG, 0x1d);
	mipi_dbi_command(mipi, ST7586_SET_NLINE_INV, 0x00);
	mipi_dbi_command(mipi, ST7586_DISP_MODE_GRAY);
	mipi_dbi_command(mipi, ST7586_ENABLE_DDRAM, 0x02);

	switch (mipi->rotation) {
	default:
		addr_mode = 0x00;
		break;
	case 90:
		addr_mode = ST7586_DISP_CTRL_MY;
		break;
	case 180:
		addr_mode = ST7586_DISP_CTRL_MX | ST7586_DISP_CTRL_MY;
		break;
	case 270:
		addr_mode = ST7586_DISP_CTRL_MX;
		break;
	}
	mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);

	mipi_dbi_command(mipi, ST7586_SET_DISP_DUTY, 0x7f);
	mipi_dbi_command(mipi, ST7586_SET_PART_DISP, 0xa0);
	mipi_dbi_command(mipi, MIPI_DCS_SET_PARTIAL_AREA, 0x00, 0x00, 0x00, 0x77);
	mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);

	msleep(100);

	mipi->enabled = true;
	st7586_fb_dirty(fb, &rect);

	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
}

static void st7586_pipe_disable(struct drm_simple_display_pipe *pipe)
{
	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);

	DRM_DEBUG_KMS("\n");

	if (!mipi->enabled)
		return;

	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
	mipi->enabled = false;
}

static const u32 st7586_formats[] = {
	DRM_FORMAT_XRGB8888,
};

static int st7586_init(struct device *dev, struct mipi_dbi *mipi,
		const struct drm_simple_display_pipe_funcs *pipe_funcs,
		struct drm_driver *driver, const struct drm_display_mode *mode,
		unsigned int rotation)
{
	size_t bufsize = (mode->vdisplay + 2) / 3 * mode->hdisplay;
	struct tinydrm_device *tdev = &mipi->tinydrm;
	int ret;

	mutex_init(&mipi->cmdlock);

	mipi->tx_buf = devm_kmalloc(dev, bufsize, GFP_KERNEL);
	if (!mipi->tx_buf)
		return -ENOMEM;

	ret = devm_tinydrm_init(dev, tdev, driver);
	if (ret)
		return ret;

	ret = tinydrm_display_pipe_init(tdev->drm, &tdev->pipe, pipe_funcs,
					DRM_MODE_CONNECTOR_VIRTUAL,
					st7586_formats,
					ARRAY_SIZE(st7586_formats),
					mode, rotation);
	if (ret)
		return ret;

	drm_plane_enable_fb_damage_clips(&tdev->pipe.plane);

	tdev->drm->mode_config.preferred_depth = 32;
	mipi->rotation = rotation;

	drm_mode_config_reset(tdev->drm);

	DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n",
		      tdev->drm->mode_config.preferred_depth, rotation);

	return 0;
}

static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = {
	.enable		= st7586_pipe_enable,
	.disable	= st7586_pipe_disable,
	.update		= st7586_pipe_update,
	.prepare_fb	= drm_gem_fb_simple_display_pipe_prepare_fb,
};

static const struct drm_display_mode st7586_mode = {
	DRM_SIMPLE_MODE(178, 128, 37, 27),
};

DEFINE_DRM_GEM_CMA_FOPS(st7586_fops);

static struct drm_driver st7586_driver = {
	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
				  DRIVER_ATOMIC,
	.fops			= &st7586_fops,
	DRM_GEM_CMA_VMAP_DRIVER_OPS,
	.debugfs_init		= mipi_dbi_debugfs_init,
	.name			= "st7586",
	.desc			= "Sitronix ST7586",
	.date			= "20170801",
	.major			= 1,
	.minor			= 0,
};

static const struct of_device_id st7586_of_match[] = {
	{ .compatible = "lego,ev3-lcd" },
	{},
};
MODULE_DEVICE_TABLE(of, st7586_of_match);

static const struct spi_device_id st7586_id[] = {
	{ "ev3-lcd", 0 },
	{ },
};
MODULE_DEVICE_TABLE(spi, st7586_id);

static int st7586_probe(struct spi_device *spi)
{
	struct device *dev = &spi->dev;
	struct mipi_dbi *mipi;
	struct gpio_desc *a0;
	u32 rotation = 0;
	int ret;

	mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
	if (!mipi)
		return -ENOMEM;

	mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(mipi->reset)) {
		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
		return PTR_ERR(mipi->reset);
	}

	a0 = devm_gpiod_get(dev, "a0", GPIOD_OUT_LOW);
	if (IS_ERR(a0)) {
		DRM_DEV_ERROR(dev, "Failed to get gpio 'a0'\n");
		return PTR_ERR(a0);
	}

	device_property_read_u32(dev, "rotation", &rotation);

	ret = mipi_dbi_spi_init(spi, mipi, a0);
	if (ret)
		return ret;

	/* Cannot read from this controller via SPI */
	mipi->read_commands = NULL;

	/*
	 * we are using 8-bit data, so we are not actually swapping anything,
	 * but setting mipi->swap_bytes makes mipi_dbi_typec3_command() do the
	 * right thing and not use 16-bit transfers (which results in swapped
	 * bytes on little-endian systems and causes out of order data to be
	 * sent to the display).
	 */
	mipi->swap_bytes = true;

	ret = st7586_init(&spi->dev, mipi, &st7586_pipe_funcs, &st7586_driver,
			  &st7586_mode, rotation);
	if (ret)
		return ret;

	spi_set_drvdata(spi, mipi->tinydrm.drm);

	return devm_tinydrm_register(&mipi->tinydrm);
}

static void st7586_shutdown(struct spi_device *spi)
{
	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
}

static struct spi_driver st7586_spi_driver = {
	.driver = {
		.name = "st7586",
		.owner = THIS_MODULE,
		.of_match_table = st7586_of_match,
	},
	.id_table = st7586_id,
	.probe = st7586_probe,
	.shutdown = st7586_shutdown,
};
module_spi_driver(st7586_spi_driver);

MODULE_DESCRIPTION("Sitronix ST7586 DRM driver");
MODULE_AUTHOR("David Lechner <david@lechnology.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
eac99d4a DL	1	/*
	2	* DRM driver for Sitronix ST7586 panels
	3	*
	4	* Copyright 2017 David Lechner <david@lechnology.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/delay.h>
	13	#include <linux/dma-buf.h>
	14	#include <linux/gpio/consumer.h>
	15	#include <linux/module.h>
	16	#include <linux/property.h>
	17	#include <linux/spi/spi.h>
	18	#include <video/mipi_display.h>
	19
d0a51634	20	#include <drm/drm_atomic_helper.h>
af741381	21	#include <drm/drm_damage_helper.h>
84056e9b	22	#include <drm/drm_drv.h>
3db8d37d NT	23	#include <drm/drm_fb_cma_helper.h>
3db8d37d NT	24	#include <drm/drm_gem_cma_helper.h>
cce1a877	25	#include <drm/drm_gem_framebuffer_helper.h>
b051b345	26	#include <drm/drm_rect.h>
af741381	27	#include <drm/drm_vblank.h>
eac99d4a DL	28	#include <drm/tinydrm/mipi-dbi.h>
	29	#include <drm/tinydrm/tinydrm-helpers.h>
	30
	31	/* controller-specific commands */
	32	#define ST7586_DISP_MODE_GRAY 0x38
	33	#define ST7586_DISP_MODE_MONO 0x39
	34	#define ST7586_ENABLE_DDRAM 0x3a
	35	#define ST7586_SET_DISP_DUTY 0xb0
	36	#define ST7586_SET_PART_DISP 0xb4
	37	#define ST7586_SET_NLINE_INV 0xb5
	38	#define ST7586_SET_VOP 0xc0
	39	#define ST7586_SET_BIAS_SYSTEM 0xc3
	40	#define ST7586_SET_BOOST_LEVEL 0xc4
	41	#define ST7586_SET_VOP_OFFSET 0xc7
	42	#define ST7586_ENABLE_ANALOG 0xd0
	43	#define ST7586_AUTO_READ_CTRL 0xd7
	44	#define ST7586_OTP_RW_CTRL 0xe0
	45	#define ST7586_OTP_CTRL_OUT 0xe1
	46	#define ST7586_OTP_READ 0xe3
	47
	48	#define ST7586_DISP_CTRL_MX BIT(6)
	49	#define ST7586_DISP_CTRL_MY BIT(7)
	50
	51	/*
	52	* The ST7586 controller has an unusual pixel format where 2bpp grayscale is
	53	* packed 3 pixels per byte with the first two pixels using 3 bits and the 3rd
	54	* pixel using only 2 bits.
	55	*
	56	* \| D7 \| D6 \| D5 \|\| \| \|\| 2bpp \|
	57	* \| (D4) \| (D3) \| (D2) \|\| D1 \| D0 \|\| GRAY \|
	58	* +------+------+------++------+------++------+
	59	* \| 1 \| 1 \| 1 \|\| 1 \| 1 \|\| 0 0 \| black
	60	* \| 1 \| 0 \| 0 \|\| 1 \| 0 \|\| 0 1 \| dark gray
	61	* \| 0 \| 1 \| 0 \|\| 0 \| 1 \|\| 1 0 \| light gray
	62	* \| 0 \| 0 \| 0 \|\| 0 \| 0 \|\| 1 1 \| white
	63	*/
	64
	65	static const u8 st7586_lookup[] = { 0x7, 0x4, 0x2, 0x0 };
	66
	67	static void st7586_xrgb8888_to_gray332(u8 dst, void vaddr,
	68	struct drm_framebuffer *fb,
b051b345	69	struct drm_rect *clip)
eac99d4a DL	70	{
	71	size_t len = (clip->x2 - clip->x1) * (clip->y2 - clip->y1);
	72	unsigned int x, y;
	73	u8 src, buf, val;
	74
	75	buf = kmalloc(len, GFP_KERNEL);
	76	if (!buf)
	77	return;
	78
	79	tinydrm_xrgb8888_to_gray8(buf, vaddr, fb, clip);
	80	src = buf;
	81
	82	for (y = clip->y1; y < clip->y2; y++) {
	83	for (x = clip->x1; x < clip->x2; x += 3) {
	84	val = st7586_lookup[*src++ >> 6] << 5;
	85	val \|= st7586_lookup[*src++ >> 6] << 2;
	86	val \|= st7586_lookup[*src++ >> 6] >> 1;
	87	*dst++ = val;
	88	}
	89	}
	90
	91	kfree(buf);
	92	}
	93
	94	static int st7586_buf_copy(void dst, struct drm_framebuffer fb,
b051b345	95	struct drm_rect *clip)
eac99d4a DL	96	{
	97	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
	98	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
	99	void *src = cma_obj->vaddr;
	100	int ret = 0;
	101
	102	if (import_attach) {
	103	ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
	104	DMA_FROM_DEVICE);
	105	if (ret)
	106	return ret;
	107	}
	108
	109	st7586_xrgb8888_to_gray332(dst, src, fb, clip);
	110
	111	if (import_attach)
	112	ret = dma_buf_end_cpu_access(import_attach->dmabuf,
	113	DMA_FROM_DEVICE);
	114
	115	return ret;
	116	}
	117
af741381	118	static void st7586_fb_dirty(struct drm_framebuffer fb, struct drm_rect rect)
eac99d4a DL	119	{
	120	struct tinydrm_device *tdev = fb->dev->dev_private;
	121	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
eac99d4a DL	122	int start, end;
	123	int ret = 0;
	124
eac99d4a	125	if (!mipi->enabled)
af741381	126	return;
eac99d4a DL	127
eac99d4a DL	128	/* 3 pixels per byte, so grow clip to nearest multiple of 3 */
b051b345 NT	129	rect->x1 = rounddown(rect->x1, 3);
b051b345 NT	130	rect->x2 = roundup(rect->x2, 3);
eac99d4a	131
b051b345	132	DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
eac99d4a	133
b051b345	134	ret = st7586_buf_copy(mipi->tx_buf, fb, rect);
eac99d4a	135	if (ret)
af741381	136	goto err_msg;
eac99d4a DL	137
eac99d4a DL	138	/* Pixels are packed 3 per byte */
b051b345 NT	139	start = rect->x1 / 3;
b051b345 NT	140	end = rect->x2 / 3;
eac99d4a DL	141
	142	mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS,
	143	(start >> 8) & 0xFF, start & 0xFF,
	144	(end >> 8) & 0xFF, (end - 1) & 0xFF);
	145	mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS,
b051b345 NT	146	(rect->y1 >> 8) & 0xFF, rect->y1 & 0xFF,
b051b345 NT	147	(rect->y2 >> 8) & 0xFF, (rect->y2 - 1) & 0xFF);
eac99d4a DL	148
	149	ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START,
	150	(u8 *)mipi->tx_buf,
b051b345	151	(end - start) * (rect->y2 - rect->y1));
af741381 NT	152	err_msg:
	153	if (ret)
	154	dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
eac99d4a DL	155	}
eac99d4a DL	156
af741381 NT	157	static void st7586_pipe_update(struct drm_simple_display_pipe *pipe,
	158	struct drm_plane_state *old_state)
	159	{
	160	struct drm_plane_state *state = pipe->plane.state;
	161	struct drm_crtc *crtc = &pipe->crtc;
	162	struct drm_rect rect;
	163
	164	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
	165	st7586_fb_dirty(state->fb, &rect);
	166
	167	if (crtc->state->event) {
	168	spin_lock_irq(&crtc->dev->event_lock);
	169	drm_crtc_send_vblank_event(crtc, crtc->state->event);
	170	spin_unlock_irq(&crtc->dev->event_lock);
	171	crtc->state->event = NULL;
	172	}
	173	}
eac99d4a	174
f3bbc908	175	static void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
0c9c7fd0 VS	176	struct drm_crtc_state *crtc_state,
0c9c7fd0 VS	177	struct drm_plane_state *plane_state)
eac99d4a DL	178	{
	179	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
	180	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
af741381 NT	181	struct drm_framebuffer *fb = plane_state->fb;
	182	struct drm_rect rect = {
	183	.x1 = 0,
	184	.x2 = fb->width,
	185	.y1 = 0,
	186	.y2 = fb->height,
	187	};
eac99d4a DL	188	int ret;
	189	u8 addr_mode;
	190
	191	DRM_DEBUG_KMS("\n");
	192
070ab128 NT	193	ret = mipi_dbi_poweron_reset(mipi);
070ab128 NT	194	if (ret)
eac99d4a	195	return;
eac99d4a	196
070ab128	197	mipi_dbi_command(mipi, ST7586_AUTO_READ_CTRL, 0x9f);
eac99d4a DL	198	mipi_dbi_command(mipi, ST7586_OTP_RW_CTRL, 0x00);
	199
	200	msleep(10);
	201
	202	mipi_dbi_command(mipi, ST7586_OTP_READ);
	203
	204	msleep(20);
	205
	206	mipi_dbi_command(mipi, ST7586_OTP_CTRL_OUT);
	207	mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
	208	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
	209
	210	msleep(50);
	211
	212	mipi_dbi_command(mipi, ST7586_SET_VOP_OFFSET, 0x00);
	213	mipi_dbi_command(mipi, ST7586_SET_VOP, 0xe3, 0x00);
	214	mipi_dbi_command(mipi, ST7586_SET_BIAS_SYSTEM, 0x02);
	215	mipi_dbi_command(mipi, ST7586_SET_BOOST_LEVEL, 0x04);
	216	mipi_dbi_command(mipi, ST7586_ENABLE_ANALOG, 0x1d);
	217	mipi_dbi_command(mipi, ST7586_SET_NLINE_INV, 0x00);
	218	mipi_dbi_command(mipi, ST7586_DISP_MODE_GRAY);
	219	mipi_dbi_command(mipi, ST7586_ENABLE_DDRAM, 0x02);
	220
	221	switch (mipi->rotation) {
	222	default:
	223	addr_mode = 0x00;
	224	break;
	225	case 90:
	226	addr_mode = ST7586_DISP_CTRL_MY;
	227	break;
	228	case 180:
	229	addr_mode = ST7586_DISP_CTRL_MX \| ST7586_DISP_CTRL_MY;
	230	break;
	231	case 270:
	232	addr_mode = ST7586_DISP_CTRL_MX;
	233	break;
	234	}
	235	mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
	236
	237	mipi_dbi_command(mipi, ST7586_SET_DISP_DUTY, 0x7f);
	238	mipi_dbi_command(mipi, ST7586_SET_PART_DISP, 0xa0);
	239	mipi_dbi_command(mipi, MIPI_DCS_SET_PARTIAL_AREA, 0x00, 0x00, 0x00, 0x77);
	240	mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
	241
	242	msleep(100);
	243
af741381 NT	244	mipi->enabled = true;
af741381 NT	245	st7586_fb_dirty(fb, &rect);
eac99d4a	246
af741381	247	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
eac99d4a DL	248	}
	249
	250	static void st7586_pipe_disable(struct drm_simple_display_pipe *pipe)
	251	{
	252	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
	253	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
	254
	255	DRM_DEBUG_KMS("\n");
	256
	257	if (!mipi->enabled)
	258	return;
	259
	260	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
	261	mipi->enabled = false;
	262	}
	263
	264	static const u32 st7586_formats[] = {
	265	DRM_FORMAT_XRGB8888,
	266	};
	267
	268	static int st7586_init(struct device dev, struct mipi_dbi mipi,
	269	const struct drm_simple_display_pipe_funcs *pipe_funcs,
	270	struct drm_driver driver, const struct drm_display_mode mode,
	271	unsigned int rotation)
	272	{
	273	size_t bufsize = (mode->vdisplay + 2) / 3 * mode->hdisplay;
	274	struct tinydrm_device *tdev = &mipi->tinydrm;
	275	int ret;
	276
	277	mutex_init(&mipi->cmdlock);
	278
	279	mipi->tx_buf = devm_kmalloc(dev, bufsize, GFP_KERNEL);
	280	if (!mipi->tx_buf)
	281	return -ENOMEM;
	282
af741381	283	ret = devm_tinydrm_init(dev, tdev, driver);
eac99d4a DL	284	if (ret)
	285	return ret;
	286
96f2a9ae	287	ret = tinydrm_display_pipe_init(tdev->drm, &tdev->pipe, pipe_funcs,
eac99d4a DL	288	DRM_MODE_CONNECTOR_VIRTUAL,
	289	st7586_formats,
	290	ARRAY_SIZE(st7586_formats),
	291	mode, rotation);
	292	if (ret)
	293	return ret;
	294
af741381 NT	295	drm_plane_enable_fb_damage_clips(&tdev->pipe.plane);
af741381 NT	296
eac99d4a DL	297	tdev->drm->mode_config.preferred_depth = 32;
	298	mipi->rotation = rotation;
	299
	300	drm_mode_config_reset(tdev->drm);
	301
	302	DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n",
	303	tdev->drm->mode_config.preferred_depth, rotation);
	304
	305	return 0;
	306	}
	307
	308	static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = {
	309	.enable = st7586_pipe_enable,
	310	.disable = st7586_pipe_disable,
af741381	311	.update = st7586_pipe_update,
ccc3b2b3	312	.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
eac99d4a DL	313	};
	314
	315	static const struct drm_display_mode st7586_mode = {
06db4b8b	316	DRM_SIMPLE_MODE(178, 128, 37, 27),
eac99d4a DL	317	};
	318
	319	DEFINE_DRM_GEM_CMA_FOPS(st7586_fops);
	320
	321	static struct drm_driver st7586_driver = {
	322	.driver_features = DRIVER_GEM \| DRIVER_MODESET \| DRIVER_PRIME \|
	323	DRIVER_ATOMIC,
	324	.fops = &st7586_fops,
3db8d37d	325	DRM_GEM_CMA_VMAP_DRIVER_OPS,
eac99d4a DL	326	.debugfs_init = mipi_dbi_debugfs_init,
	327	.name = "st7586",
	328	.desc = "Sitronix ST7586",
	329	.date = "20170801",
	330	.major = 1,
	331	.minor = 0,
	332	};
	333
	334	static const struct of_device_id st7586_of_match[] = {
	335	{ .compatible = "lego,ev3-lcd" },
	336	{},
	337	};
	338	MODULE_DEVICE_TABLE(of, st7586_of_match);
	339
	340	static const struct spi_device_id st7586_id[] = {
	341	{ "ev3-lcd", 0 },
	342	{ },
	343	};
	344	MODULE_DEVICE_TABLE(spi, st7586_id);
	345
	346	static int st7586_probe(struct spi_device *spi)
	347	{
	348	struct device *dev = &spi->dev;
eac99d4a DL	349	struct mipi_dbi *mipi;
	350	struct gpio_desc *a0;
	351	u32 rotation = 0;
	352	int ret;
	353
	354	mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
	355	if (!mipi)
	356	return -ENOMEM;
	357
	358	mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	359	if (IS_ERR(mipi->reset)) {
e43e8181	360	DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
eac99d4a DL	361	return PTR_ERR(mipi->reset);
	362	}
	363
	364	a0 = devm_gpiod_get(dev, "a0", GPIOD_OUT_LOW);
	365	if (IS_ERR(a0)) {
e43e8181	366	DRM_DEV_ERROR(dev, "Failed to get gpio 'a0'\n");
eac99d4a DL	367	return PTR_ERR(a0);
	368	}
	369
	370	device_property_read_u32(dev, "rotation", &rotation);
	371
	372	ret = mipi_dbi_spi_init(spi, mipi, a0);
	373	if (ret)
	374	return ret;
	375
	376	/* Cannot read from this controller via SPI */
	377	mipi->read_commands = NULL;
	378
	379	/*
	380	* we are using 8-bit data, so we are not actually swapping anything,
	381	* but setting mipi->swap_bytes makes mipi_dbi_typec3_command() do the
	382	* right thing and not use 16-bit transfers (which results in swapped
	383	* bytes on little-endian systems and causes out of order data to be
	384	* sent to the display).
	385	*/
	386	mipi->swap_bytes = true;
	387
	388	ret = st7586_init(&spi->dev, mipi, &st7586_pipe_funcs, &st7586_driver,
	389	&st7586_mode, rotation);
	390	if (ret)
	391	return ret;
	392
d0a51634	393	spi_set_drvdata(spi, mipi->tinydrm.drm);
eac99d4a	394
95a0cfe9	395	return devm_tinydrm_register(&mipi->tinydrm);
eac99d4a DL	396	}
	397
	398	static void st7586_shutdown(struct spi_device *spi)
	399	{
d0a51634	400	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
eac99d4a DL	401	}
	402
	403	static struct spi_driver st7586_spi_driver = {
	404	.driver = {
	405	.name = "st7586",
	406	.owner = THIS_MODULE,
	407	.of_match_table = st7586_of_match,
	408	},
	409	.id_table = st7586_id,
	410	.probe = st7586_probe,
	411	.shutdown = st7586_shutdown,
	412	};
	413	module_spi_driver(st7586_spi_driver);
	414
	415	MODULE_DESCRIPTION("Sitronix ST7586 DRM driver");
	416	MODULE_AUTHOR("David Lechner <david@lechnology.com>");
	417	MODULE_LICENSE("GPL");