[PATCH RESEND v6 1/2] drm/panel: Add support for Truly NT35597 panel driver

[PATCH RESEND v6 1/2] drm/panel: Add support for Truly NT35597 panel driver

[Abhinav Kumar]

From: "abhinavk@codeaurora.org" <abhinavk@codeaurora.org>

Add support for Truly NT35597 panel driver used
in MSM reference platforms.

This panel driver supports both single DSI and dual DSI
modes.

However, this patch series adds support only for
dual DSI mode.

Changes in v6:
- Introduce panel config to store panel specific
  details
- Bring back the size member for the panel command
  structure to make the design more scalable
- Move the display mode from the DT to driver
- Change the compatible string to indicate which
  which board and panel it will be used for
- Rename the functions to match the panel driver
- Have a data member for each compatible string
- Remove the panel commands split as its not
  required for the panel init functionality

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
---
 drivers/gpu/drm/panel/Kconfig               |   8 +
 drivers/gpu/drm/panel/Makefile              |   1 +
 drivers/gpu/drm/panel/panel-truly-nt35597.c | 705 ++++++++++++++++++++++++++++
 3 files changed, 714 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-truly-nt35597.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 6020c30..7ae74c2 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -186,4 +186,12 @@ config DRM_PANEL_SITRONIX_ST7789V
 	  Say Y here if you want to enable support for the Sitronix
 	  ST7789V controller for 240x320 LCD panels
 
+config DRM_PANEL_TRULY_NT35597_WQXGA
+	tristate "Truly WQXGA"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	select VIDEOMODE_HELPERS
+	help
+	  Say Y here if you want to enable support for Truly NT35597 WQXGA Dual DSI
+	  Video Mode panel
 endmenu
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 5ccaaa9..80fd19f 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
+obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
new file mode 100644
index 0000000..691be03
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-truly-nt35597.c
@@ -0,0 +1,705 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/of_device.h>
+
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_mipi_dsi.h>
+
+static const char * const regulator_names[] = {
+	"vdda",
+	"vdispp",
+	"vdispn",
+};
+
+static unsigned long const regulator_enable_loads[] = {
+	62000,
+	100000,
+	100000,
+};
+
+static unsigned long const regulator_disable_loads[] = {
+	80,
+	100,
+	100,
+};
+
+struct nt35597_config {
+	u32 width_mm;
+	u32 height_mm;
+	char panel_name[256];
+	void *panel_on_cmds;
+	u32 num_on_cmds;
+	struct drm_display_mode *dm;
+};
+
+struct truly_nt35597 {
+	struct device *dev;
+	struct drm_panel panel;
+
+	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *mode_gpio;
+
+	struct backlight_device *backlight;
+
+	struct mipi_dsi_device *dsi[2];
+
+	const struct nt35597_config *config;
+	bool prepared;
+	bool enabled;
+};
+
+static inline struct truly_nt35597 *panel_to_ctx(struct drm_panel *panel)
+{
+	return container_of(panel, struct truly_nt35597, panel);
+}
+
+#define MAX_LEN	5
+#define SHORT_PACKET 2
+#define LONG_PACKET 4
+
+struct cmd_set {
+	u8 commands[MAX_LEN];
+	int size;
+};
+
+static struct cmd_set qcom_2k_panel_magic_cmds[] = {
+	/* CMD2_P0 */
+	{ { 0xff, 0x20 }, 2 },
+	{ { 0xfb, 0x01 }, 2 },
+	{ { 0x00, 0x01 }, 2 },
+	{ { 0x01, 0x55 }, 2 },
+	{ { 0x02, 0x45 }, 2 },
+	{ { 0x05, 0x40 }, 2 },
+	{ { 0x06, 0x19 }, 2 },
+	{ { 0x07, 0x1e }, 2 },
+	{ { 0x0b, 0x73 }, 2 },
+	{ { 0x0c, 0x73 }, 2 },
+	{ { 0x0e, 0xb0 }, 2 },
+	{ { 0x0f, 0xae }, 2 },
+	{ { 0x11, 0xb8 }, 2 },
+	{ { 0x13, 0x00 }, 2 },
+	{ { 0x58, 0x80 }, 2 },
+	{ { 0x59, 0x01 }, 2 },
+	{ { 0x5a, 0x00 }, 2 },
+	{ { 0x5b, 0x01 }, 2 },
+	{ { 0x5c, 0x80 }, 2 },
+	{ { 0x5d, 0x81 }, 2 },
+	{ { 0x5e, 0x00 }, 2 },
+	{ { 0x5f, 0x01 }, 2 },
+	{ { 0x72, 0x11 }, 2 },
+	{ { 0x68, 0x03 }, 2 },
+	/* CMD2_P4 */
+	{ { 0xFF, 0x24 }, 2 },
+	{ { 0xFB, 0x01 }, 2 },
+	{ { 0x00, 0x1C }, 2 },
+	{ { 0x01, 0x0B }, 2 },
+	{ { 0x02, 0x0C }, 2 },
+	{ { 0x03, 0x01 }, 2 },
+	{ { 0x04, 0x0F }, 2 },
+	{ { 0x05, 0x10 }, 2 },
+	{ { 0x06, 0x10 }, 2 },
+	{ { 0x07, 0x10 }, 2 },
+	{ { 0x08, 0x89 }, 2 },
+	{ { 0x09, 0x8A }, 2 },
+	{ { 0x0A, 0x13 }, 2 },
+	{ { 0x0B, 0x13 }, 2 },
+	{ { 0x0C, 0x15 }, 2 },
+	{ { 0x0D, 0x15 }, 2 },
+	{ { 0x0E, 0x17 }, 2 },
+	{ { 0x0F, 0x17 }, 2 },
+	{ { 0x10, 0x1C }, 2 },
+	{ { 0x11, 0x0B }, 2 },
+	{ { 0x12, 0x0C }, 2 },
+	{ { 0x13, 0x01 }, 2 },
+	{ { 0x14, 0x0F }, 2 },
+	{ { 0x15, 0x10 }, 2 },
+	{ { 0x16, 0x10 }, 2 },
+	{ { 0x17, 0x10 }, 2 },
+	{ { 0x18, 0x89 }, 2 },
+	{ { 0x19, 0x8A }, 2 },
+	{ { 0x1A, 0x13 }, 2 },
+	{ { 0x1B, 0x13 }, 2 },
+	{ { 0x1C, 0x15 }, 2 },
+	{ { 0x1D, 0x15 }, 2 },
+	{ { 0x1E, 0x17 }, 2 },
+	{ { 0x1F, 0x17 }, 2 },
+	/* STV */
+	{ { 0x20, 0x40 }, 2 },
+	{ { 0x21, 0x01 }, 2 },
+	{ { 0x22, 0x00 }, 2 },
+	{ { 0x23, 0x40 }, 2 },
+	{ { 0x24, 0x40 }, 2 },
+	{ { 0x25, 0x6D }, 2 },
+	{ { 0x26, 0x40 }, 2 },
+	{ { 0x27, 0x40 }, 2 },
+	/* Vend */
+	{ { 0xE0, 0x00 }, 2 },
+	{ { 0xDC, 0x21 }, 2 },
+	{ { 0xDD, 0x22 }, 2 },
+	{ { 0xDE, 0x07 }, 2 },
+	{ { 0xDF, 0x07 }, 2 },
+	{ { 0xE3, 0x6D }, 2 },
+	{ { 0xE1, 0x07 }, 2 },
+	{ { 0xE2, 0x07 }, 2 },
+	/* UD */
+	{ { 0x29, 0xD8 }, 2 },
+	{ { 0x2A, 0x2A }, 2 },
+	/* CLK */
+	{ { 0x4B, 0x03 }, 2 },
+	{ { 0x4C, 0x11 }, 2 },
+	{ { 0x4D, 0x10 }, 2 },
+	{ { 0x4E, 0x01 }, 2 },
+	{ { 0x4F, 0x01 }, 2 },
+	{ { 0x50, 0x10 }, 2 },
+	{ { 0x51, 0x00 }, 2 },
+	{ { 0x52, 0x80 }, 2 },
+	{ { 0x53, 0x00 }, 2 },
+	{ { 0x56, 0x00 }, 2 },
+	{ { 0x54, 0x07 }, 2 },
+	{ { 0x58, 0x07 }, 2 },
+	{ { 0x55, 0x25 }, 2 },
+	/* Reset XDONB */
+	{ { 0x5B, 0x43 }, 2 },
+	{ { 0x5C, 0x00 }, 2 },
+	{ { 0x5F, 0x73 }, 2 },
+	{ { 0x60, 0x73 }, 2 },
+	{ { 0x63, 0x22 }, 2 },
+	{ { 0x64, 0x00 }, 2 },
+	{ { 0x67, 0x08 }, 2 },
+	{ { 0x68, 0x04 }, 2 },
+	/* Resolution:1440x2560 */
+	{ { 0x72, 0x02 }, 2 },
+	/* mux */
+	{ { 0x7A, 0x80 }, 2 },
+	{ { 0x7B, 0x91 }, 2 },
+	{ { 0x7C, 0xD8 }, 2 },
+	{ { 0x7D, 0x60 }, 2 },
+	{ { 0x7F, 0x15 }, 2 },
+	{ { 0x75, 0x15 }, 2 },
+	/* ABOFF */
+	{ { 0xB3, 0xC0 }, 2 },
+	{ { 0xB4, 0x00 }, 2 },
+	{ { 0xB5, 0x00 }, 2 },
+	/* Source EQ */
+	{ { 0x78, 0x00 }, 2 },
+	{ { 0x79, 0x00 }, 2 },
+	{ { 0x80, 0x00 }, 2 },
+	{ { 0x83, 0x00 }, 2 },
+	/* FP BP */
+	{ { 0x93, 0x0A }, 2 },
+	{ { 0x94, 0x0A }, 2 },
+	/* Inversion Type */
+	{ { 0x8A, 0x00 }, 2 },
+	{ { 0x9B, 0xFF }, 2 },
+	/* IMGSWAP =1 @PortSwap=1 */
+	{ { 0x9D, 0xB0 }, 2 },
+	{ { 0x9F, 0x63 }, 2 },
+	{ { 0x98, 0x10 }, 2 },
+	/* FRM */
+	{ { 0xEC, 0x00 }, 2 },
+	/* CMD1 */
+	{ { 0xFF, 0x10 }, 2 },
+	/* VBP+VSA=,VFP = 10H */
+	{ { 0x3B, 0x03, 0x0A, 0x0A }, 4 },
+	/* FTE on */
+	{ { 0x35, 0x00 }, 2 },
+	/* EN_BK =1(auto black) */
+	{ { 0xE5, 0x01 }, 2 },
+	/* CMD mode(10) VDO mode(03) */
+	{ { 0xBB, 0x03 }, 2 },
+	/* Non Reload MTP */
+	{ { 0xFB, 0x01 }, 2 },
+};
+
+static int truly_dcs_write(struct drm_panel *panel, u32 command)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
+		ret = mipi_dsi_dcs_write(ctx->dsi[i],
+			command, NULL, 0);
+		if (ret < 0) {
+			DRM_DEV_ERROR(ctx->dev,
+				"set_display_off cmd failed for dsi = %d\n",
+			i);
+		}
+	}
+
+	return ret;
+}
+
+static int truly_dcs_write_buf(struct drm_panel *panel,
+	u32 size, u8 *buf)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
+		ret = mipi_dsi_dcs_write_buffer(ctx->dsi[i],
+			buf,
+			size);
+
+		if (ret < 0) {
+			DRM_DEV_ERROR(ctx->dev,
+				"failed to tx cmd [%d], err: %d\n",
+				i, ret);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+#define truly_call_write_func(ret, func, panel, command) {\
+	ret = func(panel, command);     \
+}
+
+#define truly_write_buf_func(ret, func, panel, size, buf) {\
+	ret = func(panel, size, buf); \
+}
+
+static int truly_35597_power_on(struct truly_nt35597 *ctx)
+{
+	int ret, i;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
+		ret = regulator_set_load(ctx->supplies[i].consumer,
+					regulator_enable_loads[i]);
+		if (ret)
+			return ret;
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	/* Reset sequence of truly panel requires
+	 * the reset pin to be pulled high for 10ms
+	 * followed by a low period of 10ms and then
+	 * pulled high again
+	 */
+
+	gpiod_set_value(ctx->reset_gpio, 1);
+	msleep(20);
+	gpiod_set_value(ctx->reset_gpio, 0);
+	msleep(20);
+	gpiod_set_value(ctx->reset_gpio, 1);
+
+	return 0;
+}
+
+static int truly_nt35597_power_off(struct truly_nt35597 *ctx)
+{
+	int ret, i;
+
+	gpiod_set_value(ctx->reset_gpio, 0);
+
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
+		ret = regulator_set_load(ctx->supplies[i].consumer,
+				regulator_disable_loads[i]);
+		if (ret)
+			return ret;
+	}
+
+	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+}
+
+static int truly_nt35597_disable(struct drm_panel *panel)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret;
+
+	if (!ctx->enabled)
+		return 0;
+
+	if (ctx->backlight) {
+		ret = backlight_disable(ctx->backlight);
+		if (ret < 0)
+			DRM_DEV_ERROR(ctx->dev, "backlight disable failed %d\n",
+				ret);
+	}
+
+	ctx->enabled = false;
+	return 0;
+}
+
+static int truly_nt35597_unprepare(struct drm_panel *panel)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret = 0;
+
+	if (!ctx->prepared)
+		return 0;
+
+	ctx->dsi[0]->mode_flags = 0;
+	ctx->dsi[1]->mode_flags = 0;
+
+	truly_call_write_func(ret, truly_dcs_write, panel,
+		MIPI_DCS_SET_DISPLAY_OFF);
+
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"set_display_off cmd failed ret = %d\n",
+			ret);
+	}
+
+	/* 120ms delay required here as per DCS spec */
+	msleep(120);
+
+	truly_call_write_func(ret, truly_dcs_write, panel,
+		MIPI_DCS_ENTER_SLEEP_MODE);
+
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"enter_sleep cmd failed ret = %d\n",
+			ret);
+	}
+
+	ret = truly_nt35597_power_off(ctx);
+	if (ret < 0)
+		DRM_DEV_ERROR(ctx->dev,
+			"truly_nt35597_power_off failed ret = %d\n",
+			ret);
+
+	ctx->prepared = false;
+	return ret;
+}
+
+static int truly_nt35597_prepare(struct drm_panel *panel)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret;
+	int i;
+	struct cmd_set *panel_on_cmds;
+	const struct nt35597_config *config;
+	u32 num_cmds;
+
+	if (ctx->prepared)
+		return 0;
+
+	ret = truly_35597_power_on(ctx);
+	if (ret < 0)
+		return ret;
+
+	ctx->dsi[0]->mode_flags |= MIPI_DSI_MODE_LPM;
+	ctx->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	config = ctx->config;
+	panel_on_cmds = (struct cmd_set *)config->panel_on_cmds;
+	num_cmds = config->num_on_cmds;
+
+	for (i = 0; i < num_cmds; i++)
+		truly_write_buf_func(ret, truly_dcs_write_buf,
+			panel, panel_on_cmds[i].size,
+			panel_on_cmds[i].commands);
+
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"panel_cmds_set failed ret = %d\n",
+			ret);
+	}
+
+	/* As per DSI spec need to wait for 120ms
+	 * after sending the exit sleep DCS command
+	 */
+
+	truly_call_write_func(ret, truly_dcs_write, panel,
+		MIPI_DCS_EXIT_SLEEP_MODE);
+
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"exit_sleep_mode cmd failed ret = %d\n",
+			ret);
+	}
+
+	msleep(120);
+
+	truly_call_write_func(ret, truly_dcs_write, panel,
+		MIPI_DCS_SET_DISPLAY_ON);
+
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"set_display_on cmd failed ret = %d\n",
+			ret);
+	}
+
+	/* Adding 120ms delay before the start of
+	 * pixel stream to the panel after sending
+	 * the set_display_on DCS command
+	 */
+
+	msleep(120);
+
+	ctx->prepared = true;
+
+	return 0;
+}
+
+static int truly_nt35597_enable(struct drm_panel *panel)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret;
+
+	if (ctx->enabled)
+		return 0;
+
+	if (ctx->backlight) {
+		ret = backlight_enable(ctx->backlight);
+		if (ret < 0)
+			DRM_DEV_ERROR(ctx->dev, "backlight enable failed %d\n",
+						  ret);
+	}
+
+	ctx->enabled = true;
+
+	return 0;
+}
+
+static int truly_nt35597_get_modes(struct drm_panel *panel)
+{
+	struct drm_connector *connector = panel->connector;
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	struct drm_display_mode *mode;
+	const struct nt35597_config *config;
+
+	config = ctx->config;
+	mode = drm_mode_create(connector->dev);
+	if (!mode) {
+		DRM_DEV_ERROR(ctx->dev,
+			"failed to create a new display mode\n");
+		return 0;
+	}
+
+	connector->display_info.width_mm = config->width_mm;
+	connector->display_info.height_mm = config->height_mm;
+	/* Copy the mode from the DT and add it */
+	drm_mode_copy(mode, config->dm);
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs truly_nt35597_drm_funcs = {
+	.disable = truly_nt35597_disable,
+	.unprepare = truly_nt35597_unprepare,
+	.prepare = truly_nt35597_prepare,
+	.enable = truly_nt35597_enable,
+	.get_modes = truly_nt35597_get_modes,
+};
+
+static int truly_nt35597_panel_add(struct truly_nt35597 *ctx)
+{
+	struct device *dev = ctx->dev;
+	int ret, i;
+	const struct nt35597_config *config;
+
+	config = ctx->config;
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
+		ctx->supplies[i].supply = regulator_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+				      ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ctx->reset_gpio)) {
+		DRM_DEV_ERROR(dev, "cannot get reset gpio %ld\n",
+			PTR_ERR(ctx->reset_gpio));
+		return PTR_ERR(ctx->reset_gpio);
+	}
+
+	ctx->mode_gpio = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->mode_gpio)) {
+		DRM_DEV_ERROR(dev, "cannot get mode gpio %ld\n",
+			PTR_ERR(ctx->mode_gpio));
+		return PTR_ERR(ctx->mode_gpio);
+	}
+
+	/* dual port */
+	gpiod_set_value(ctx->mode_gpio, 0);
+
+	drm_panel_init(&ctx->panel);
+	ctx->panel.dev = dev;
+	ctx->panel.funcs = &truly_nt35597_drm_funcs;
+	drm_panel_add(&ctx->panel);
+
+	return 0;
+}
+
+static struct drm_display_mode qcom_sdm845_mtp_2k_mode = {
+	.name = "1440x2560",
+	.clock = 268316,
+	.hdisplay = 1440,
+	.hsync_start = 1440 + 200,
+	.hsync_end = 1440 + 200 + 32,
+	.htotal = 1440 + 200 + 32 + 64,
+	.vdisplay = 2560,
+	.vsync_start = 2560 + 8,
+	.vsync_end = 2560 + 8 + 1,
+	.vtotal = 2560 + 8 + 1 + 7,
+	.vrefresh = 60,
+	.flags = 0,
+};
+
+static struct nt35597_config nt35597_dir = {
+	.width_mm = 74,
+	.height_mm = 131,
+	.panel_name = "qcom_sdm845_mtp_2k_panel",
+	.dm = &qcom_sdm845_mtp_2k_mode,
+	.panel_on_cmds = qcom_2k_panel_magic_cmds,
+	.num_on_cmds = ARRAY_SIZE(qcom_2k_panel_magic_cmds),
+};
+
+static int truly_nt35597_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct truly_nt35597 *ctx;
+	struct mipi_dsi_device *dsi1_device;
+	struct device_node *dsi1;
+	struct mipi_dsi_host *dsi1_host;
+	struct mipi_dsi_device *dsi_dev;
+	int ret = 0;
+	int i;
+
+	const struct mipi_dsi_device_info info = {.type = "trulynt35597",
+		.channel = 0,
+		.node = NULL,
+	};
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+
+	if (!ctx)
+		return -ENOMEM;
+
+	/* This device represents itself as one with
+	 * two input ports which are fed by the output
+	 * ports of the two DSI controllers . The DSI0
+	 * is the master controller and has most of the
+	 * panel related info in its child node.
+	 */
+
+	ctx->config = of_device_get_match_data(dev);
+
+	if (!ctx->config) {
+		dev_err(dev, "missing device configuration\n");
+		return -ENODEV;
+	}
+
+	dsi1 = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
+	if (!dsi1) {
+		DRM_DEV_ERROR(dev,
+			"failed to get remote node for dsi1_device\n");
+		ret = -ENODEV;
+		goto err_get_remote;
+	}
+
+	dsi1_host = of_find_mipi_dsi_host_by_node(dsi1);
+	if (!dsi1_host) {
+		DRM_DEV_ERROR(dev, "failed to find dsi host\n");
+		ret = -EPROBE_DEFER;
+		goto err_host;
+	}
+
+	of_node_put(dsi1);
+
+	/* register the second DSI device */
+	dsi1_device = mipi_dsi_device_register_full(dsi1_host, &info);
+	if (IS_ERR(dsi1_device)) {
+		DRM_DEV_ERROR(dev, "failed to create dsi device\n");
+		ret = PTR_ERR(dsi);
+		goto err_dsi_device;
+	}
+
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	ctx->dev = dev;
+	ctx->dsi[0] = dsi;
+	ctx->dsi[1] = dsi1_device;
+
+	ret = truly_nt35597_panel_add(ctx);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "failed to add panel\n");
+		goto err_panel_add;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
+		dsi_dev = ctx->dsi[i];
+		dsi_dev->lanes = 4;
+		dsi_dev->format = MIPI_DSI_FMT_RGB888;
+		dsi_dev->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM |
+			MIPI_DSI_CLOCK_NON_CONTINUOUS;
+		ret = mipi_dsi_attach(dsi_dev);
+		if (ret < 0) {
+			DRM_DEV_ERROR(dev,
+				"dsi attach failed i = %d\n", i);
+				goto err_dsi_attach;
+		}
+	}
+
+	return 0;
+
+err_dsi_attach:
+	drm_panel_remove(&ctx->panel);
+err_panel_add:
+	mipi_dsi_device_unregister(dsi1_device);
+err_dsi_device:
+err_host:
+	of_node_put(dsi1);
+err_get_remote:
+	return ret;
+}
+
+static int truly_nt35597_remove(struct mipi_dsi_device *dsi)
+{
+	struct truly_nt35597 *ctx = mipi_dsi_get_drvdata(dsi);
+
+	if (ctx->dsi[0])
+		mipi_dsi_detach(ctx->dsi[0]);
+	if (ctx->dsi[1]) {
+		mipi_dsi_detach(ctx->dsi[1]);
+		mipi_dsi_device_unregister(ctx->dsi[1]);
+	}
+
+	drm_panel_remove(&ctx->panel);
+	return 0;
+}
+
+static const struct of_device_id truly_wqxga_of_match[] = {
+	{	.compatible = "qcom,sdm845-mtp-2K-display",
+		.data = &nt35597_dir,
+	},
+
+	{ }
+};
+MODULE_DEVICE_TABLE(of, truly_wqxga_of_match);
+
+static struct mipi_dsi_driver truly_wqxga_driver = {
+	.driver = {
+		.name = "panel_truly_nt35597",
+		.of_match_table = truly_wqxga_of_match,
+	},
+	.probe = truly_nt35597_probe,
+	.remove = truly_nt35597_remove,
+};
+module_mipi_dsi_driver(truly_wqxga_driver);
+
+MODULE_DESCRIPTION("Truly NT35597 DSI Panel Driver");
+MODULE_LICENSE("GPL v2");
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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[PATCH RESEND v6 2/2] dt-bindings: Add Truly NT35597 panel driver bindings

[Abhinav Kumar]

From: "abhinavk@codeaurora.org" <abhinavk@codeaurora.org>

Add the device tree bindings for Truly NT35597 panel driver.
This panel driver supports both single DSI and dual DSI.

However, this patch series supports only dual DSI.

Changes in v6:
  - Change the compatible string to indicate the
    reference board and the panel
  - Remove the display timing node

Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
---
 .../devicetree/bindings/display/truly,nt35597.txt  | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/truly,nt35597.txt

diff --git a/Documentation/devicetree/bindings/display/truly,nt35597.txt b/Documentation/devicetree/bindings/display/truly,nt35597.txt
new file mode 100644
index 0000000..68960a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/truly,nt35597.txt
@@ -0,0 +1,55 @@
+Truly model NT35597 1440x2560 DSI Panel
+
+Required properties:
+- compatible: should be "qcom,sdm845-mtp-2K-display"
+- vdda-supply: phandle of the regulator that provides the supply voltage
+  Power IC supply
+- vdispp-supply: phandle of the regulator that provides the supply voltage
+  for positive LCD bias
+- vdispn-supply: phandle of the regulator that provides the supply voltage
+  for negative LCD bias
+- reset-gpios: phandle of gpio for reset line
+  This should be 8mA, gpio can be configured using mux, pinctrl, pinctrl-names
+- mode-gpios: phandle of the gpio for choosing the mode of the display
+  for single DSI or Dual DSI
+  This should be low for dual DSI and high for single DSI mode
+- ports: This device has two video ports driven by two DSIs. Their connections
+  are modelled using the OF graph bindings specified in
+  Documentation/devicetree/bindings/graph.txt.
+  - port@0: DSI input port driven by master DSI
+  - port@1: DSI input port driven by secondary DSI
+
+Example:
+
+	dsi@ae94000 {
+		panel@0 {
+			compatible = "qcom,sdm845-mtp-2K-display";
+			reg = <0>;
+			vdda-supply = <&pm8998_l14>;
+			vdispp-supply = <&lab_regulator>;
+			vdispn-supply = <&ibb_regulator>;
+			pinctrl-names = "default", "suspend";
+			pinctrl-0 = <&dpu_dsi_active>;
+			pinctrl-1 = <&dpu_dsi_suspend>;
+
+			reset-gpios = <&tlmm 6 0>;
+			mode-gpios = <&tlmm 52 0>;
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				port@0 {
+					reg = <0>;
+					panel0_in: endpoint {
+						remote-endpoint = <&dsi0_out>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					panel1_in: endpoint {
+						remote-endpoint = <&dsi1_out>;
+					};
+				};
+			};
+		};
+	};
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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Re: [PATCH RESEND v6 1/2] drm/panel: Add support for Truly NT35597 panel driver

[Sam Ravnborg]

Hi Abhinav.

On Tue, Aug 28, 2018 at 03:39:46PM -0700, Abhinav Kumar wrote:
> From: "abhinavk@codeaurora.org" <abhinavk@codeaurora.org>
> 
> Add support for Truly NT35597 panel driver used
> in MSM reference platforms.
> 
> This panel driver supports both single DSI and dual DSI
> modes.
> 
> However, this patch series adds support only for
> dual DSI mode.
> 
> Changes in v6:
...

Comments from:
https://lists.freedesktop.org/archives/dri-devel/2018-August/187562.html

seems not to be addressed? Did you miss them?

	Sam
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Re: [PATCH RESEND v6 1/2] drm/panel: Add support for Truly NT35597 panel driver

[abhinavk]

Hi Sam

Yes, looks like I missed Philip's comments.

Will reply to his mail and fix them in v7.

Thanks for pointing it out.

Abhinav

On 2018-08-28 21:34, Sam Ravnborg wrote:
> Hi Abhinav.
> 
> On Tue, Aug 28, 2018 at 03:39:46PM -0700, Abhinav Kumar wrote:
>> From: "abhinavk@codeaurora.org" <abhinavk@codeaurora.org>
>> 
>> Add support for Truly NT35597 panel driver used
>> in MSM reference platforms.
>> 
>> This panel driver supports both single DSI and dual DSI
>> modes.
>> 
>> However, this patch series adds support only for
>> dual DSI mode.
>> 
>> Changes in v6:
> ...
> 
> Comments from:
> https://lists.freedesktop.org/archives/dri-devel/2018-August/187562.html
> 
> seems not to be addressed? Did you miss them?
> 
> 	Sam
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Re: [PATCH RESEND v6 2/2] dt-bindings: Add Truly NT35597 panel driver bindings

[Linus Walleij]

On Wed, Aug 29, 2018 at 12:39 AM Abhinav Kumar <abhinavk@codeaurora.org> wrote:

> From: "abhinavk@codeaurora.org" <abhinavk@codeaurora.org>
>
> Add the device tree bindings for Truly NT35597 panel driver.
> This panel driver supports both single DSI and dual DSI.
>
> However, this patch series supports only dual DSI.
>
> Changes in v6:
>   - Change the compatible string to indicate the
>     reference board and the panel
>   - Remove the display timing node
>
> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>

I like this much better :)

> +Truly model NT35597 1440x2560 DSI Panel

Maybe say just
"Truly model NT35597 DSI display driver"

Then a blurb of text like this:

"The Truly NT35597 is a generic display driver, currently only configured
for use in the 2K display on th Qualcomm SDM845."

The rest is fine.

With the above changes:
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij
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Re: [PATCH RESEND v6 1/2] drm/panel: Add support for Truly NT35597 panel driver

[Bjorn Andersson]

On Tue 28 Aug 15:39 PDT 2018, Abhinav Kumar wrote:

> From: "abhinavk@codeaurora.org" <abhinavk@codeaurora.org>
> 
> Add support for Truly NT35597 panel driver used
> in MSM reference platforms.
> 
> This panel driver supports both single DSI and dual DSI
> modes.
> 
> However, this patch series adds support only for
> dual DSI mode.
> 
> Changes in v6:
> - Introduce panel config to store panel specific
>   details
> - Bring back the size member for the panel command
>   structure to make the design more scalable
> - Move the display mode from the DT to driver
> - Change the compatible string to indicate which
>   which board and panel it will be used for
> - Rename the functions to match the panel driver
> - Have a data member for each compatible string
> - Remove the panel commands split as its not
>   required for the panel init functionality
> 
> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
[..]
> diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
[..]
> +	{	.compatible = "qcom,sdm845-mtp-2K-display",

I do not agree with Linus here.

If I understand correctly the variability in the video timing comes from
the fact that the LCD Driver IC (NT35597) can be paired with different
LCD panels. As such I strongly believe that the compatible should
describe this combo, not which phone/devkit you mounted a panel using
this Driver IC on.

Regards,
Bjorn
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Re: [PATCH RESEND v6 1/2] drm/panel: Add support for Truly NT35597 panel driver

[Linus Walleij]

On Mon, Sep 3, 2018 at 9:50 PM Bjorn Andersson
<bjorn.andersson@linaro.org> wrote:
> On Tue 28 Aug 15:39 PDT 2018, Abhinav Kumar wrote:
> > From: "abhinavk@codeaurora.org" <abhinavk@codeaurora.org>
> >
> > Add support for Truly NT35597 panel driver used
> > in MSM reference platforms.
> >
> > This panel driver supports both single DSI and dual DSI
> > modes.
> >
> > However, this patch series adds support only for
> > dual DSI mode.
> >
> > Changes in v6:
> > - Introduce panel config to store panel specific
> >   details
> > - Bring back the size member for the panel command
> >   structure to make the design more scalable
> > - Move the display mode from the DT to driver
> > - Change the compatible string to indicate which
> >   which board and panel it will be used for
> > - Rename the functions to match the panel driver
> > - Have a data member for each compatible string
> > - Remove the panel commands split as its not
> >   required for the panel init functionality
> >
> > Signed-off-by: Archit Taneja <architt@codeaurora.org>
> > Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
> [..]
> > diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
> [..]
> > +     {       .compatible = "qcom,sdm845-mtp-2K-display",
>
> I do not agree with Linus here.
>
> If I understand correctly the variability in the video timing comes from
> the fact that the LCD Driver IC (NT35597) can be paired with different
> LCD panels. As such I strongly believe that the compatible should
> describe this combo, not which phone/devkit you mounted a panel using
> this Driver IC on.

I agree with that.

I just saw "it's some qualcomm string, not just the name of the LCD
driver so OK".

The inability to parse the "qcom,*" string is just my ignorance, sorry
for that.

Yours,
Linus Walleij
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Re: [PATCH RESEND v6 1/2] drm/panel: Add support for Truly NT35597 panel driver

[Abhinav Kumar]

Hi Bjorn and Linus

Thanks for the comments.

Based on this, since we want to remove the dev/phone dependency but 
retain the driver + panel dependency on the compatible string, while 
addressing Philip's comments, I shall rename the string as 
"truly,nt35597-2K-display".

Let me know if there are any concerns with this.

Thanks

Abhinav

On 2018-09-03 15:00, Linus Walleij wrote:
> On Mon, Sep 3, 2018 at 9:50 PM Bjorn Andersson
> <bjorn.andersson@linaro.org> wrote:
>> On Tue 28 Aug 15:39 PDT 2018, Abhinav Kumar wrote:
>> > From: "abhinavk@codeaurora.org" <abhinavk@codeaurora.org>
>> >
>> > Add support for Truly NT35597 panel driver used
>> > in MSM reference platforms.
>> >
>> > This panel driver supports both single DSI and dual DSI
>> > modes.
>> >
>> > However, this patch series adds support only for
>> > dual DSI mode.
>> >
>> > Changes in v6:
>> > - Introduce panel config to store panel specific
>> >   details
>> > - Bring back the size member for the panel command
>> >   structure to make the design more scalable
>> > - Move the display mode from the DT to driver
>> > - Change the compatible string to indicate which
>> >   which board and panel it will be used for
>> > - Rename the functions to match the panel driver
>> > - Have a data member for each compatible string
>> > - Remove the panel commands split as its not
>> >   required for the panel init functionality
>> >
>> > Signed-off-by: Archit Taneja <architt@codeaurora.org>
>> > Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
>> [..]
>> > diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
>> [..]
>> > +     {       .compatible = "qcom,sdm845-mtp-2K-display",
>> 
>> I do not agree with Linus here.
>> 
>> If I understand correctly the variability in the video timing comes 
>> from
>> the fact that the LCD Driver IC (NT35597) can be paired with different
>> LCD panels. As such I strongly believe that the compatible should
>> describe this combo, not which phone/devkit you mounted a panel using
>> this Driver IC on.
> 
> I agree with that.
> 
> I just saw "it's some qualcomm string, not just the name of the LCD
> driver so OK".
> 
> The inability to parse the "qcom,*" string is just my ignorance, sorry
> for that.
> 
> Yours,
> Linus Walleij
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> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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