[PATCH 1/2] drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels

[PATCH 1/2] drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels

[AngeloGioacchino Del Regno]

Add a driver for panels using the Novatek NT35950 Display Driver IC,
including support for the Sharp LS055D1SX04, found in some Sony Xperia
Z5 Premium and XZ Premium smartphones.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
---
 drivers/gpu/drm/panel/Kconfig                 |  11 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-novatek-nt35950.c | 702 ++++++++++++++++++
 3 files changed, 714 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-novatek-nt35950.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index ab5a52c71ec5..1cf064d597a2 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -271,6 +271,17 @@ config DRM_PANEL_NOVATEK_NT35510
 	  around the Novatek NT35510 display controller, such as some
 	  Hydis panels.
 
+config DRM_PANEL_NOVATEK_NT35950
+	tristate "Novatek NT35950 DSI panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the panels built
+	  around the Novatek NT35950 display controller, such as some
+	  Sharp panels used in Sony Xperia Z5 Premium and XZ Premium
+	  mobile phones.
+
 config DRM_PANEL_NOVATEK_NT36672A
 	tristate "Novatek NT36672A DSI panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 1b494d479ffd..190b5f90af4d 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_DRM_PANEL_LG_LB035Q02) += panel-lg-lb035q02.o
 obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
 obj-$(CONFIG_DRM_PANEL_NEC_NL8048HL11) += panel-nec-nl8048hl11.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT35510) += panel-novatek-nt35510.o
+obj-$(CONFIG_DRM_PANEL_NOVATEK_NT35950) += panel-novatek-nt35950.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36672A) += panel-novatek-nt36672a.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT39016) += panel-novatek-nt39016.o
 obj-$(CONFIG_DRM_PANEL_MANTIX_MLAF057WE51) += panel-mantix-mlaf057we51.o
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35950.c b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
new file mode 100644
index 000000000000..d42c7af0d75c
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
@@ -0,0 +1,702 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Novatek NT35950 DriverIC panels driver
+ *
+ * Copyright (c) 2021 AngeloGioacchino Del Regno
+ *                    <angelogioacchino.delregno@somainline.org>
+ */
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#define MCS_CMD_MAUCCTR			0xf0 /* Manufacturer command enable */
+#define MCS_PARAM_SCALER_FUNCTION	0x58 /* Scale-up function */
+#define MCS_PARAM_SCALEUP_MODE		0xc9
+ #define MCS_SCALEUP_SIMPLE		0x0
+ #define MCS_SCALEUP_BILINEAR		BIT(0)
+ #define MCS_SCALEUP_DUPLICATE		(BIT(0) | BIT(4))
+
+/* VESA Display Stream Compression param */
+#define MCS_PARAM_VESA_DSC_ON		0x03
+
+/* Data Compression mode */
+#define MCS_PARAM_DATA_COMPRESSION	0x90
+ #define MCS_DATA_COMPRESSION_NONE	0x00
+ #define MCS_DATA_COMPRESSION_FBC	0x02
+ #define MCS_DATA_COMPRESSION_DSC	0x03
+
+/* Display Output control */
+#define MCS_PARAM_DISP_OUTPUT_CTRL	0xb4
+ #define MCS_DISP_OUT_SRAM_EN		BIT(0)
+ #define MCS_DISP_OUT_VIDEO_MODE	BIT(4)
+
+/* VESA Display Stream Compression setting */
+#define MCS_PARAM_VESA_DSC_SETTING	0xc0
+
+/* SubPixel Rendering (SPR) */
+#define MCS_PARAM_SPR_EN		0xe3
+#define MCS_PARAM_SPR_MODE		0xef
+ #define MCS_SPR_MODE_YYG_RAINBOW_RGB	0x01
+
+#define NT35950_VREG_MAX		4
+
+struct nt35950 {
+	struct drm_panel panel;
+	struct drm_connector *connector;
+	struct mipi_dsi_device *dsi[2];
+	struct regulator_bulk_data vregs[NT35950_VREG_MAX];
+	struct gpio_desc *reset_gpio;
+	const struct nt35950_panel_desc *desc;
+
+	int cur_mode;
+	u8 last_page;
+	bool prepared;
+};
+
+struct nt35950_panel_mode {
+	const struct drm_display_mode mode;
+
+	bool enable_sram;
+	bool is_video_mode;
+	u8 scaler_on;
+	u8 scaler_mode;
+	u8 compression;
+	u8 spr_en;
+	u8 spr_mode;
+};
+
+struct nt35950_panel_desc {
+	const char *model_name;
+	const struct mipi_dsi_device_info dsi_info;
+	const struct nt35950_panel_mode *mode_data;
+
+	bool is_dual_dsi;
+	u8 num_lanes;
+	u8 num_modes;
+};
+
+static inline struct nt35950 *to_nt35950(struct drm_panel *panel)
+{
+	return container_of(panel, struct nt35950, panel);
+}
+
+#define dsi_dcs_write_seq(dsi, seq...) do {				\
+		static const u8 d[] = { seq };				\
+		int ret;						\
+		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
+		if (ret < 0)						\
+			return ret;					\
+	} while (0)
+
+static void nt35950_reset(struct nt35950 *nt)
+{
+	gpiod_set_value_cansleep(nt->reset_gpio, 1);
+	usleep_range(12000, 13000);
+	gpiod_set_value_cansleep(nt->reset_gpio, 0);
+	usleep_range(300, 400);
+	gpiod_set_value_cansleep(nt->reset_gpio, 1);
+	usleep_range(12000, 13000);
+}
+
+/*
+ * nt35950_set_cmd2_page - Select manufacturer control (CMD2) page
+ * @nt:   Main driver structure
+ * @page: Page number (0-7)
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_cmd2_page(struct nt35950 *nt, u8 page)
+{
+	const u8 mauc_cmd2_page[] = { MCS_CMD_MAUCCTR, 0x55, 0xaa, 0x52,
+				      0x08, page };
+	int ret;
+
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], mauc_cmd2_page,
+					ARRAY_SIZE(mauc_cmd2_page));
+	if (ret < 0)
+		return ret;
+
+	nt->last_page = page;
+	return 0;
+}
+
+/*
+ * nt35950_set_data_compression - Set data compression mode
+ * @nt:        Main driver structure
+ * @comp_mode: Compression mode
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_data_compression(struct nt35950 *nt, u8 comp_mode)
+{
+	u8 cmd_data_compression[] = { MCS_PARAM_DATA_COMPRESSION, comp_mode };
+	u8 cmd_vesa_dsc_on[] = { MCS_PARAM_VESA_DSC_ON, !!comp_mode };
+	u8 cmd_vesa_dsc_setting[] = { MCS_PARAM_VESA_DSC_SETTING, 0x03 };
+	u8 last_page = nt->last_page;
+	int ret;
+
+	/* Set CMD2 Page 0 if we're not there yet */
+	if (last_page != 0) {
+		ret = nt35950_set_cmd2_page(nt, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_data_compression,
+					ARRAY_SIZE(cmd_data_compression));
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_vesa_dsc_on,
+					ARRAY_SIZE(cmd_vesa_dsc_on));
+	if (ret < 0)
+		return ret;
+
+	/* Set the vesa dsc setting on Page 4 */
+	ret = nt35950_set_cmd2_page(nt, 4);
+	if (ret < 0)
+		return ret;
+
+	/* Display Stream Compression setting, always 0x03 */
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_vesa_dsc_setting,
+					ARRAY_SIZE(cmd_vesa_dsc_setting));
+	if (ret < 0)
+		return ret;
+
+	/* Get back to the previously set page */
+	return nt35950_set_cmd2_page(nt, last_page);
+}
+
+/*
+ * nt35950_set_scaler - Enable/disable resolution upscaling
+ * @nt:        Main driver structure
+ * @scale_up:  Scale up function control
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_scaler(struct nt35950 *nt, u8 scale_up)
+{
+	u8 cmd_scaler[] = { MCS_PARAM_SCALER_FUNCTION, scale_up };
+
+	return mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_scaler,
+					 ARRAY_SIZE(cmd_scaler));
+}
+
+/*
+ * nt35950_set_scale_mode - Resolution upscaling mode
+ * @nt:   Main driver structure
+ * @mode: Scaler mode (MCS_DATA_COMPRESSION_*)
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_scale_mode(struct nt35950 *nt, u8 mode)
+{
+	u8 cmd_scaler[] = { MCS_PARAM_SCALEUP_MODE, mode };
+
+	return mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_scaler,
+					 ARRAY_SIZE(cmd_scaler));
+}
+
+/*
+ * nt35950_inject_black_image - Display a completely black image
+ * @nt:   Main driver structure
+ *
+ * After IC setup, the attached panel may show random data
+ * due to driveric behavior changes (resolution, compression,
+ * scaling, etc). This function, called after parameters setup,
+ * makes the driver ic to output a completely black image to
+ * the display.
+ * It makes sense to push a black image before sending the sleep-out
+ * and display-on commands.
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_inject_black_image(struct nt35950 *nt)
+{
+	const u8 cmd0_black_img[] = { 0x6f, 0x01 };
+	const u8 cmd1_black_img[] = { 0xf3, 0x10 };
+	u8 cmd_test[] = { 0xff, 0xaa, 0x55, 0xa5, 0x80 };
+	int ret;
+
+	/* Enable test command */
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_test, ARRAY_SIZE(cmd_test));
+	if (ret < 0)
+		return ret;
+
+	/* Send a black image */
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd0_black_img,
+					ARRAY_SIZE(cmd0_black_img));
+	if (ret < 0)
+		return ret;
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd1_black_img,
+					ARRAY_SIZE(cmd1_black_img));
+	if (ret < 0)
+		return ret;
+
+	/* Disable test command */
+	cmd_test[ARRAY_SIZE(cmd_test) - 1] = 0x00;
+	return mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_test, ARRAY_SIZE(cmd_test));
+}
+
+/*
+ * nt35950_set_dispout - Set Display Output register parameters
+ * @nt:    Main driver structure
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_dispout(struct nt35950 *nt)
+{
+	u8 cmd_dispout[] = { MCS_PARAM_DISP_OUTPUT_CTRL, 0x00 };
+	const struct nt35950_panel_mode *mode_data = nt->desc->mode_data;
+
+	if (mode_data[nt->cur_mode].is_video_mode)
+		cmd_dispout[1] |= MCS_DISP_OUT_VIDEO_MODE;
+	if (mode_data[nt->cur_mode].enable_sram)
+		cmd_dispout[1] |= MCS_DISP_OUT_SRAM_EN;
+
+	return mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_dispout,
+					 ARRAY_SIZE(cmd_dispout));
+}
+
+static int nt35950_get_current_mode(struct nt35950 *nt)
+{
+	struct drm_connector *connector = nt->connector;
+	struct drm_crtc_state *crtc_state;
+	int i;
+
+	/* Return the default (first) mode if no info available yet */
+	if (!connector->state || !connector->state->crtc)
+		return 0;
+
+	crtc_state = connector->state->crtc->state;
+
+	for (i = 0; i < nt->desc->num_modes; i++) {
+		if (drm_mode_match(&crtc_state->mode,
+				   &nt->desc->mode_data[i].mode,
+				   DRM_MODE_MATCH_TIMINGS | DRM_MODE_MATCH_CLOCK))
+			return i;
+	}
+
+	return 0;
+}
+
+static int nt35950_on(struct nt35950 *nt)
+{
+	const struct nt35950_panel_mode *mode_data = nt->desc->mode_data;
+	struct mipi_dsi_device *dsi = nt->dsi[0];
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	nt->cur_mode = nt35950_get_current_mode(nt);
+	nt->dsi[0]->mode_flags |= MIPI_DSI_MODE_LPM;
+	nt->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	ret = nt35950_set_cmd2_page(nt, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = nt35950_set_data_compression(nt, mode_data[nt->cur_mode].compression);
+	if (ret < 0)
+		return ret;
+
+	ret = nt35950_set_scale_mode(nt, mode_data[nt->cur_mode].scaler_mode);
+	if (ret < 0)
+		return ret;
+
+	ret = nt35950_set_scaler(nt, mode_data[nt->cur_mode].scaler_on);
+	if (ret < 0)
+		return ret;
+
+	ret = nt35950_set_dispout(nt);
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set tear on: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_tear_scanline(dsi, 0);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set tear scanline: %d\n", ret);
+		return ret;
+	}
+
+	/* CMD2 Page 1 */
+	ret = nt35950_set_cmd2_page(nt, 1);
+	if (ret < 0)
+		return ret;
+
+	/* Unknown command */
+	dsi_dcs_write_seq(dsi, 0xd4, 0x88, 0x88);
+
+	/* CMD2 Page 7 */
+	ret = nt35950_set_cmd2_page(nt, 7);
+	if (ret < 0)
+		return ret;
+
+	/* Enable SubPixel Rendering */
+	dsi_dcs_write_seq(dsi, MCS_PARAM_SPR_EN, 0x01);
+
+	/* SPR Mode: YYG Rainbow-RGB */
+	dsi_dcs_write_seq(dsi, MCS_PARAM_SPR_MODE, MCS_SPR_MODE_YYG_RAINBOW_RGB);
+
+	/* CMD3 */
+	ret = nt35950_inject_black_image(nt);
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0)
+		return ret;
+	msleep(120);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0)
+		return ret;
+	msleep(120);
+
+	nt->dsi[0]->mode_flags &= ~MIPI_DSI_MODE_LPM;
+	nt->dsi[1]->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int nt35950_off(struct nt35950 *nt)
+{
+	struct device *dev = &nt->dsi[0]->dev;
+	int ret;
+
+	ret = mipi_dsi_dcs_set_display_off(nt->dsi[0]);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display off: %d\n", ret);
+		goto set_lpm;
+	}
+	usleep_range(10000, 11000);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(nt->dsi[0]);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
+		goto set_lpm;
+	}
+	msleep(150);
+
+set_lpm:
+	nt->dsi[0]->mode_flags |= MIPI_DSI_MODE_LPM;
+	nt->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int nt35950_sharp_init_vregs(struct nt35950 *nt, struct device *dev)
+{
+	int ret;
+
+	nt->vregs[0].supply = "vddio";
+	nt->vregs[1].supply = "avdd";
+	nt->vregs[2].supply = "avee";
+	nt->vregs[3].supply = "dvdd";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(nt->vregs),
+				      nt->vregs);
+	if (ret < 0)
+		return ret;
+
+	ret = regulator_is_supported_voltage(nt->vregs[0].consumer,
+					     1750000, 1950000);
+	if (!ret)
+		return -EINVAL;
+	ret = regulator_is_supported_voltage(nt->vregs[1].consumer,
+					     5200000, 5900000);
+	if (!ret)
+		return -EINVAL;
+	/* AVEE is negative: -5.90V to -5.20V */
+	ret = regulator_is_supported_voltage(nt->vregs[2].consumer,
+					     5200000, 5900000);
+	if (!ret)
+		return -EINVAL;
+
+	ret = regulator_is_supported_voltage(nt->vregs[3].consumer,
+					     1300000, 1400000);
+	if (!ret)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int nt35950_prepare(struct drm_panel *panel)
+{
+	struct nt35950 *nt = to_nt35950(panel);
+	struct device *dev = &nt->dsi[0]->dev;
+	int ret;
+
+	if (nt->prepared)
+		return 0;
+
+	ret = regulator_enable(nt->vregs[0].consumer);
+	if (ret)
+		return ret;
+	usleep_range(2000, 5000);
+
+	ret = regulator_enable(nt->vregs[3].consumer);
+	if (ret)
+		goto end;
+	usleep_range(15000, 18000);
+
+	ret = regulator_enable(nt->vregs[1].consumer);
+	if (ret)
+		goto end;
+
+	ret = regulator_enable(nt->vregs[2].consumer);
+	if (ret)
+		goto end;
+	usleep_range(12000, 13000);
+
+	nt35950_reset(nt);
+
+	ret = nt35950_on(nt);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		goto end;
+	}
+	nt->prepared = true;
+
+end:
+	if (ret < 0) {
+		regulator_bulk_disable(ARRAY_SIZE(nt->vregs), nt->vregs);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int nt35950_unprepare(struct drm_panel *panel)
+{
+	struct nt35950 *nt = to_nt35950(panel);
+	struct device *dev = &nt->dsi[0]->dev;
+	int ret;
+
+	if (!nt->prepared)
+		return 0;
+
+	ret = nt35950_off(nt);
+	if (ret < 0)
+		dev_err(dev, "Failed to deinitialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(nt->reset_gpio, 0);
+	regulator_bulk_disable(ARRAY_SIZE(nt->vregs), nt->vregs);
+
+	nt->prepared = false;
+	return 0;
+}
+
+static int nt35950_get_modes(struct drm_panel *panel,
+			     struct drm_connector *connector)
+{
+	struct nt35950 *nt = to_nt35950(panel);
+	int i;
+
+	for (i = 0; i < nt->desc->num_modes; i++) {
+		struct drm_display_mode *mode;
+
+		mode = drm_mode_duplicate(connector->dev,
+					  &nt->desc->mode_data[i].mode);
+		if (!mode)
+			return -ENOMEM;
+
+		drm_mode_set_name(mode);
+
+		mode->type |= DRM_MODE_TYPE_DRIVER;
+		if (nt->desc->num_modes == 1)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+		drm_mode_probed_add(connector, mode);
+	}
+
+	connector->display_info.bpc = 8;
+	connector->display_info.height_mm = nt->desc->mode_data[0].mode.height_mm;
+	connector->display_info.width_mm = nt->desc->mode_data[0].mode.width_mm;
+	nt->connector = connector;
+
+	return nt->desc->num_modes;
+}
+
+static const struct drm_panel_funcs nt35950_panel_funcs = {
+	.prepare = nt35950_prepare,
+	.unprepare = nt35950_unprepare,
+	.get_modes = nt35950_get_modes,
+};
+
+static int nt35950_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct device_node *dsi_r;
+	struct mipi_dsi_host *dsi_r_host;
+	struct nt35950 *nt;
+	const struct mipi_dsi_device_info *info;
+	int i, num_dsis = 1, ret;
+
+	nt = devm_kzalloc(dev, sizeof(*nt), GFP_KERNEL);
+	if (!nt)
+		return -ENOMEM;
+
+	ret = nt35950_sharp_init_vregs(nt, dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Regulator init failure.\n");
+
+	nt->desc = of_device_get_match_data(dev);
+	if (!nt->desc)
+		return -ENODEV;
+
+	nt->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_ASIS);
+	if (IS_ERR(nt->reset_gpio)) {
+		return dev_err_probe(dev, PTR_ERR(nt->reset_gpio),
+				     "Failed to get reset gpio\n");
+	}
+
+	/* If the panel is connected on two DSIs then DSI0 left, DSI1 right */
+	if (nt->desc->is_dual_dsi) {
+		info = &nt->desc->dsi_info;
+		dsi_r = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
+		if (!dsi_r) {
+			dev_err(dev, "Cannot get secondary DSI node.\n");
+			return -ENODEV;
+		}
+		dsi_r_host = of_find_mipi_dsi_host_by_node(dsi_r);
+		of_node_put(dsi_r);
+		if (!dsi_r_host) {
+			dev_err(dev, "Cannot get secondary DSI host\n");
+			return -EPROBE_DEFER;
+		}
+
+		nt->dsi[1] = mipi_dsi_device_register_full(dsi_r_host, info);
+		if (!nt->dsi[1]) {
+			dev_err(dev, "Cannot get secondary DSI node\n");
+			return -ENODEV;
+		}
+		num_dsis++;
+	}
+
+	nt->dsi[0] = dsi;
+	mipi_dsi_set_drvdata(dsi, nt);
+
+	drm_panel_init(&nt->panel, dev, &nt35950_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	ret = drm_panel_of_backlight(&nt->panel);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get backlight\n");
+
+	drm_panel_add(&nt->panel);
+
+	for (i = 0; i < num_dsis; i++) {
+		nt->dsi[i]->lanes = nt->desc->num_lanes;
+		nt->dsi[i]->format = MIPI_DSI_FMT_RGB888;
+
+		nt->dsi[i]->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS |
+					 MIPI_DSI_MODE_LPM;
+
+		if (nt->desc->mode_data[0].is_video_mode)
+			nt->dsi[i]->mode_flags |= MIPI_DSI_MODE_VIDEO;
+
+		ret = mipi_dsi_attach(nt->dsi[i]);
+		if (ret < 0) {
+			return dev_err_probe(dev, ret,
+					     "Cannot attach to DSI%d host.\n", i);
+		}
+	}
+
+	/* Make sure to set RESX LOW before starting the power-on sequence */
+	gpiod_set_value_cansleep(nt->reset_gpio, 0);
+	return 0;
+}
+
+static int nt35950_remove(struct mipi_dsi_device *dsi)
+{
+	struct nt35950 *nt = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(nt->dsi[0]);
+	if (ret < 0)
+		dev_err(&dsi->dev,
+			"Failed to detach from DSI0 host: %d\n", ret);
+
+	if (nt->dsi[1]) {
+		ret = mipi_dsi_detach(nt->dsi[1]);
+		if (ret < 0)
+			dev_err(&dsi->dev,
+				"Failed to detach from DSI1 host: %d\n", ret);
+		mipi_dsi_device_unregister(nt->dsi[1]);
+	};
+
+	drm_panel_remove(&nt->panel);
+
+	return 0;
+}
+
+static const struct nt35950_panel_mode sharp_ls055d1sx04_modes[] = {
+	{
+		/* 1920x1080 60Hz no compression */
+		.mode = {
+			.clock = 214537,
+			.hdisplay = 1080,
+			.hsync_start = 1080 + 400,
+			.hsync_end = 1080 + 400 + 40,
+			.htotal = 1080 + 400 + 40 + 300,
+			.vdisplay = 1920,
+			.vsync_start = 1920 + 12,
+			.vsync_end = 1920 + 12 + 2,
+			.vtotal = 1920 + 12 + 2 + 10,
+			.width_mm = 68,
+			.height_mm = 121,
+		},
+		.compression = MCS_DATA_COMPRESSION_NONE,
+		.enable_sram = true,
+		.is_video_mode = false,
+		.scaler_on = 1,
+		.scaler_mode = MCS_SCALEUP_DUPLICATE,
+	},
+	/* TODO: Add 2160x3840 60Hz when DSC is supported */
+};
+
+const struct nt35950_panel_desc sharp_ls055d1sx04 = {
+	.model_name = "Sharp LS055D1SX04",
+	.dsi_info = {
+		.type = "LS055D1SX04",
+		.channel = 0,
+		.node = NULL,
+	},
+	.mode_data = sharp_ls055d1sx04_modes,
+	.num_modes = ARRAY_SIZE(sharp_ls055d1sx04_modes),
+	.is_dual_dsi = true,
+	.num_lanes = 4,
+};
+
+static const struct of_device_id nt35950_of_match[] = {
+	{ .compatible = "sharp,ls055d1sx04", .data = &sharp_ls055d1sx04 },
+	{  }
+};
+MODULE_DEVICE_TABLE(of, nt35950_of_match);
+
+static struct mipi_dsi_driver nt35950_driver = {
+	.probe = nt35950_probe,
+	.remove = nt35950_remove,
+	.driver = {
+		.name = "panel-novatek-nt35950",
+		.of_match_table = nt35950_of_match,
+	},
+};
+module_mipi_dsi_driver(nt35950_driver);
+
+MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>");
+MODULE_DESCRIPTION("Novatek NT35950 DriverIC panels driver");
+MODULE_LICENSE("GPL v2");
-- 
2.32.0

[PATCH 1/2] drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels

[AngeloGioacchino Del Regno]

Add a driver for panels using the Novatek NT35950 Display Driver IC,
including support for the Sharp LS055D1SX04, found in some Sony Xperia
Z5 Premium and XZ Premium smartphones.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
---
 drivers/gpu/drm/panel/Kconfig                 |  11 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-novatek-nt35950.c | 702 ++++++++++++++++++
 3 files changed, 714 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-novatek-nt35950.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index ab5a52c71ec5..1cf064d597a2 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -271,6 +271,17 @@ config DRM_PANEL_NOVATEK_NT35510
 	  around the Novatek NT35510 display controller, such as some
 	  Hydis panels.
 
+config DRM_PANEL_NOVATEK_NT35950
+	tristate "Novatek NT35950 DSI panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the panels built
+	  around the Novatek NT35950 display controller, such as some
+	  Sharp panels used in Sony Xperia Z5 Premium and XZ Premium
+	  mobile phones.
+
 config DRM_PANEL_NOVATEK_NT36672A
 	tristate "Novatek NT36672A DSI panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 1b494d479ffd..190b5f90af4d 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_DRM_PANEL_LG_LB035Q02) += panel-lg-lb035q02.o
 obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
 obj-$(CONFIG_DRM_PANEL_NEC_NL8048HL11) += panel-nec-nl8048hl11.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT35510) += panel-novatek-nt35510.o
+obj-$(CONFIG_DRM_PANEL_NOVATEK_NT35950) += panel-novatek-nt35950.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36672A) += panel-novatek-nt36672a.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT39016) += panel-novatek-nt39016.o
 obj-$(CONFIG_DRM_PANEL_MANTIX_MLAF057WE51) += panel-mantix-mlaf057we51.o
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35950.c b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
new file mode 100644
index 000000000000..d42c7af0d75c
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
@@ -0,0 +1,702 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Novatek NT35950 DriverIC panels driver
+ *
+ * Copyright (c) 2021 AngeloGioacchino Del Regno
+ *                    <angelogioacchino.delregno@somainline.org>
+ */
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#define MCS_CMD_MAUCCTR			0xf0 /* Manufacturer command enable */
+#define MCS_PARAM_SCALER_FUNCTION	0x58 /* Scale-up function */
+#define MCS_PARAM_SCALEUP_MODE		0xc9
+ #define MCS_SCALEUP_SIMPLE		0x0
+ #define MCS_SCALEUP_BILINEAR		BIT(0)
+ #define MCS_SCALEUP_DUPLICATE		(BIT(0) | BIT(4))
+
+/* VESA Display Stream Compression param */
+#define MCS_PARAM_VESA_DSC_ON		0x03
+
+/* Data Compression mode */
+#define MCS_PARAM_DATA_COMPRESSION	0x90
+ #define MCS_DATA_COMPRESSION_NONE	0x00
+ #define MCS_DATA_COMPRESSION_FBC	0x02
+ #define MCS_DATA_COMPRESSION_DSC	0x03
+
+/* Display Output control */
+#define MCS_PARAM_DISP_OUTPUT_CTRL	0xb4
+ #define MCS_DISP_OUT_SRAM_EN		BIT(0)
+ #define MCS_DISP_OUT_VIDEO_MODE	BIT(4)
+
+/* VESA Display Stream Compression setting */
+#define MCS_PARAM_VESA_DSC_SETTING	0xc0
+
+/* SubPixel Rendering (SPR) */
+#define MCS_PARAM_SPR_EN		0xe3
+#define MCS_PARAM_SPR_MODE		0xef
+ #define MCS_SPR_MODE_YYG_RAINBOW_RGB	0x01
+
+#define NT35950_VREG_MAX		4
+
+struct nt35950 {
+	struct drm_panel panel;
+	struct drm_connector *connector;
+	struct mipi_dsi_device *dsi[2];
+	struct regulator_bulk_data vregs[NT35950_VREG_MAX];
+	struct gpio_desc *reset_gpio;
+	const struct nt35950_panel_desc *desc;
+
+	int cur_mode;
+	u8 last_page;
+	bool prepared;
+};
+
+struct nt35950_panel_mode {
+	const struct drm_display_mode mode;
+
+	bool enable_sram;
+	bool is_video_mode;
+	u8 scaler_on;
+	u8 scaler_mode;
+	u8 compression;
+	u8 spr_en;
+	u8 spr_mode;
+};
+
+struct nt35950_panel_desc {
+	const char *model_name;
+	const struct mipi_dsi_device_info dsi_info;
+	const struct nt35950_panel_mode *mode_data;
+
+	bool is_dual_dsi;
+	u8 num_lanes;
+	u8 num_modes;
+};
+
+static inline struct nt35950 *to_nt35950(struct drm_panel *panel)
+{
+	return container_of(panel, struct nt35950, panel);
+}
+
+#define dsi_dcs_write_seq(dsi, seq...) do {				\
+		static const u8 d[] = { seq };				\
+		int ret;						\
+		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
+		if (ret < 0)						\
+			return ret;					\
+	} while (0)
+
+static void nt35950_reset(struct nt35950 *nt)
+{
+	gpiod_set_value_cansleep(nt->reset_gpio, 1);
+	usleep_range(12000, 13000);
+	gpiod_set_value_cansleep(nt->reset_gpio, 0);
+	usleep_range(300, 400);
+	gpiod_set_value_cansleep(nt->reset_gpio, 1);
+	usleep_range(12000, 13000);
+}
+
+/*
+ * nt35950_set_cmd2_page - Select manufacturer control (CMD2) page
+ * @nt:   Main driver structure
+ * @page: Page number (0-7)
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_cmd2_page(struct nt35950 *nt, u8 page)
+{
+	const u8 mauc_cmd2_page[] = { MCS_CMD_MAUCCTR, 0x55, 0xaa, 0x52,
+				      0x08, page };
+	int ret;
+
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], mauc_cmd2_page,
+					ARRAY_SIZE(mauc_cmd2_page));
+	if (ret < 0)
+		return ret;
+
+	nt->last_page = page;
+	return 0;
+}
+
+/*
+ * nt35950_set_data_compression - Set data compression mode
+ * @nt:        Main driver structure
+ * @comp_mode: Compression mode
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_data_compression(struct nt35950 *nt, u8 comp_mode)
+{
+	u8 cmd_data_compression[] = { MCS_PARAM_DATA_COMPRESSION, comp_mode };
+	u8 cmd_vesa_dsc_on[] = { MCS_PARAM_VESA_DSC_ON, !!comp_mode };
+	u8 cmd_vesa_dsc_setting[] = { MCS_PARAM_VESA_DSC_SETTING, 0x03 };
+	u8 last_page = nt->last_page;
+	int ret;
+
+	/* Set CMD2 Page 0 if we're not there yet */
+	if (last_page != 0) {
+		ret = nt35950_set_cmd2_page(nt, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_data_compression,
+					ARRAY_SIZE(cmd_data_compression));
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_vesa_dsc_on,
+					ARRAY_SIZE(cmd_vesa_dsc_on));
+	if (ret < 0)
+		return ret;
+
+	/* Set the vesa dsc setting on Page 4 */
+	ret = nt35950_set_cmd2_page(nt, 4);
+	if (ret < 0)
+		return ret;
+
+	/* Display Stream Compression setting, always 0x03 */
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_vesa_dsc_setting,
+					ARRAY_SIZE(cmd_vesa_dsc_setting));
+	if (ret < 0)
+		return ret;
+
+	/* Get back to the previously set page */
+	return nt35950_set_cmd2_page(nt, last_page);
+}
+
+/*
+ * nt35950_set_scaler - Enable/disable resolution upscaling
+ * @nt:        Main driver structure
+ * @scale_up:  Scale up function control
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_scaler(struct nt35950 *nt, u8 scale_up)
+{
+	u8 cmd_scaler[] = { MCS_PARAM_SCALER_FUNCTION, scale_up };
+
+	return mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_scaler,
+					 ARRAY_SIZE(cmd_scaler));
+}
+
+/*
+ * nt35950_set_scale_mode - Resolution upscaling mode
+ * @nt:   Main driver structure
+ * @mode: Scaler mode (MCS_DATA_COMPRESSION_*)
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_scale_mode(struct nt35950 *nt, u8 mode)
+{
+	u8 cmd_scaler[] = { MCS_PARAM_SCALEUP_MODE, mode };
+
+	return mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_scaler,
+					 ARRAY_SIZE(cmd_scaler));
+}
+
+/*
+ * nt35950_inject_black_image - Display a completely black image
+ * @nt:   Main driver structure
+ *
+ * After IC setup, the attached panel may show random data
+ * due to driveric behavior changes (resolution, compression,
+ * scaling, etc). This function, called after parameters setup,
+ * makes the driver ic to output a completely black image to
+ * the display.
+ * It makes sense to push a black image before sending the sleep-out
+ * and display-on commands.
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_inject_black_image(struct nt35950 *nt)
+{
+	const u8 cmd0_black_img[] = { 0x6f, 0x01 };
+	const u8 cmd1_black_img[] = { 0xf3, 0x10 };
+	u8 cmd_test[] = { 0xff, 0xaa, 0x55, 0xa5, 0x80 };
+	int ret;
+
+	/* Enable test command */
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_test, ARRAY_SIZE(cmd_test));
+	if (ret < 0)
+		return ret;
+
+	/* Send a black image */
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd0_black_img,
+					ARRAY_SIZE(cmd0_black_img));
+	if (ret < 0)
+		return ret;
+	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd1_black_img,
+					ARRAY_SIZE(cmd1_black_img));
+	if (ret < 0)
+		return ret;
+
+	/* Disable test command */
+	cmd_test[ARRAY_SIZE(cmd_test) - 1] = 0x00;
+	return mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_test, ARRAY_SIZE(cmd_test));
+}
+
+/*
+ * nt35950_set_dispout - Set Display Output register parameters
+ * @nt:    Main driver structure
+ *
+ * Return: Number of transferred bytes or negative number on error
+ */
+static int nt35950_set_dispout(struct nt35950 *nt)
+{
+	u8 cmd_dispout[] = { MCS_PARAM_DISP_OUTPUT_CTRL, 0x00 };
+	const struct nt35950_panel_mode *mode_data = nt->desc->mode_data;
+
+	if (mode_data[nt->cur_mode].is_video_mode)
+		cmd_dispout[1] |= MCS_DISP_OUT_VIDEO_MODE;
+	if (mode_data[nt->cur_mode].enable_sram)
+		cmd_dispout[1] |= MCS_DISP_OUT_SRAM_EN;
+
+	return mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_dispout,
+					 ARRAY_SIZE(cmd_dispout));
+}
+
+static int nt35950_get_current_mode(struct nt35950 *nt)
+{
+	struct drm_connector *connector = nt->connector;
+	struct drm_crtc_state *crtc_state;
+	int i;
+
+	/* Return the default (first) mode if no info available yet */
+	if (!connector->state || !connector->state->crtc)
+		return 0;
+
+	crtc_state = connector->state->crtc->state;
+
+	for (i = 0; i < nt->desc->num_modes; i++) {
+		if (drm_mode_match(&crtc_state->mode,
+				   &nt->desc->mode_data[i].mode,
+				   DRM_MODE_MATCH_TIMINGS | DRM_MODE_MATCH_CLOCK))
+			return i;
+	}
+
+	return 0;
+}
+
+static int nt35950_on(struct nt35950 *nt)
+{
+	const struct nt35950_panel_mode *mode_data = nt->desc->mode_data;
+	struct mipi_dsi_device *dsi = nt->dsi[0];
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	nt->cur_mode = nt35950_get_current_mode(nt);
+	nt->dsi[0]->mode_flags |= MIPI_DSI_MODE_LPM;
+	nt->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	ret = nt35950_set_cmd2_page(nt, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = nt35950_set_data_compression(nt, mode_data[nt->cur_mode].compression);
+	if (ret < 0)
+		return ret;
+
+	ret = nt35950_set_scale_mode(nt, mode_data[nt->cur_mode].scaler_mode);
+	if (ret < 0)
+		return ret;
+
+	ret = nt35950_set_scaler(nt, mode_data[nt->cur_mode].scaler_on);
+	if (ret < 0)
+		return ret;
+
+	ret = nt35950_set_dispout(nt);
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set tear on: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_tear_scanline(dsi, 0);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set tear scanline: %d\n", ret);
+		return ret;
+	}
+
+	/* CMD2 Page 1 */
+	ret = nt35950_set_cmd2_page(nt, 1);
+	if (ret < 0)
+		return ret;
+
+	/* Unknown command */
+	dsi_dcs_write_seq(dsi, 0xd4, 0x88, 0x88);
+
+	/* CMD2 Page 7 */
+	ret = nt35950_set_cmd2_page(nt, 7);
+	if (ret < 0)
+		return ret;
+
+	/* Enable SubPixel Rendering */
+	dsi_dcs_write_seq(dsi, MCS_PARAM_SPR_EN, 0x01);
+
+	/* SPR Mode: YYG Rainbow-RGB */
+	dsi_dcs_write_seq(dsi, MCS_PARAM_SPR_MODE, MCS_SPR_MODE_YYG_RAINBOW_RGB);
+
+	/* CMD3 */
+	ret = nt35950_inject_black_image(nt);
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0)
+		return ret;
+	msleep(120);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0)
+		return ret;
+	msleep(120);
+
+	nt->dsi[0]->mode_flags &= ~MIPI_DSI_MODE_LPM;
+	nt->dsi[1]->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int nt35950_off(struct nt35950 *nt)
+{
+	struct device *dev = &nt->dsi[0]->dev;
+	int ret;
+
+	ret = mipi_dsi_dcs_set_display_off(nt->dsi[0]);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display off: %d\n", ret);
+		goto set_lpm;
+	}
+	usleep_range(10000, 11000);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(nt->dsi[0]);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
+		goto set_lpm;
+	}
+	msleep(150);
+
+set_lpm:
+	nt->dsi[0]->mode_flags |= MIPI_DSI_MODE_LPM;
+	nt->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int nt35950_sharp_init_vregs(struct nt35950 *nt, struct device *dev)
+{
+	int ret;
+
+	nt->vregs[0].supply = "vddio";
+	nt->vregs[1].supply = "avdd";
+	nt->vregs[2].supply = "avee";
+	nt->vregs[3].supply = "dvdd";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(nt->vregs),
+				      nt->vregs);
+	if (ret < 0)
+		return ret;
+
+	ret = regulator_is_supported_voltage(nt->vregs[0].consumer,
+					     1750000, 1950000);
+	if (!ret)
+		return -EINVAL;
+	ret = regulator_is_supported_voltage(nt->vregs[1].consumer,
+					     5200000, 5900000);
+	if (!ret)
+		return -EINVAL;
+	/* AVEE is negative: -5.90V to -5.20V */
+	ret = regulator_is_supported_voltage(nt->vregs[2].consumer,
+					     5200000, 5900000);
+	if (!ret)
+		return -EINVAL;
+
+	ret = regulator_is_supported_voltage(nt->vregs[3].consumer,
+					     1300000, 1400000);
+	if (!ret)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int nt35950_prepare(struct drm_panel *panel)
+{
+	struct nt35950 *nt = to_nt35950(panel);
+	struct device *dev = &nt->dsi[0]->dev;
+	int ret;
+
+	if (nt->prepared)
+		return 0;
+
+	ret = regulator_enable(nt->vregs[0].consumer);
+	if (ret)
+		return ret;
+	usleep_range(2000, 5000);
+
+	ret = regulator_enable(nt->vregs[3].consumer);
+	if (ret)
+		goto end;
+	usleep_range(15000, 18000);
+
+	ret = regulator_enable(nt->vregs[1].consumer);
+	if (ret)
+		goto end;
+
+	ret = regulator_enable(nt->vregs[2].consumer);
+	if (ret)
+		goto end;
+	usleep_range(12000, 13000);
+
+	nt35950_reset(nt);
+
+	ret = nt35950_on(nt);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		goto end;
+	}
+	nt->prepared = true;
+
+end:
+	if (ret < 0) {
+		regulator_bulk_disable(ARRAY_SIZE(nt->vregs), nt->vregs);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int nt35950_unprepare(struct drm_panel *panel)
+{
+	struct nt35950 *nt = to_nt35950(panel);
+	struct device *dev = &nt->dsi[0]->dev;
+	int ret;
+
+	if (!nt->prepared)
+		return 0;
+
+	ret = nt35950_off(nt);
+	if (ret < 0)
+		dev_err(dev, "Failed to deinitialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(nt->reset_gpio, 0);
+	regulator_bulk_disable(ARRAY_SIZE(nt->vregs), nt->vregs);
+
+	nt->prepared = false;
+	return 0;
+}
+
+static int nt35950_get_modes(struct drm_panel *panel,
+			     struct drm_connector *connector)
+{
+	struct nt35950 *nt = to_nt35950(panel);
+	int i;
+
+	for (i = 0; i < nt->desc->num_modes; i++) {
+		struct drm_display_mode *mode;
+
+		mode = drm_mode_duplicate(connector->dev,
+					  &nt->desc->mode_data[i].mode);
+		if (!mode)
+			return -ENOMEM;
+
+		drm_mode_set_name(mode);
+
+		mode->type |= DRM_MODE_TYPE_DRIVER;
+		if (nt->desc->num_modes == 1)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+		drm_mode_probed_add(connector, mode);
+	}
+
+	connector->display_info.bpc = 8;
+	connector->display_info.height_mm = nt->desc->mode_data[0].mode.height_mm;
+	connector->display_info.width_mm = nt->desc->mode_data[0].mode.width_mm;
+	nt->connector = connector;
+
+	return nt->desc->num_modes;
+}
+
+static const struct drm_panel_funcs nt35950_panel_funcs = {
+	.prepare = nt35950_prepare,
+	.unprepare = nt35950_unprepare,
+	.get_modes = nt35950_get_modes,
+};
+
+static int nt35950_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct device_node *dsi_r;
+	struct mipi_dsi_host *dsi_r_host;
+	struct nt35950 *nt;
+	const struct mipi_dsi_device_info *info;
+	int i, num_dsis = 1, ret;
+
+	nt = devm_kzalloc(dev, sizeof(*nt), GFP_KERNEL);
+	if (!nt)
+		return -ENOMEM;
+
+	ret = nt35950_sharp_init_vregs(nt, dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Regulator init failure.\n");
+
+	nt->desc = of_device_get_match_data(dev);
+	if (!nt->desc)
+		return -ENODEV;
+
+	nt->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_ASIS);
+	if (IS_ERR(nt->reset_gpio)) {
+		return dev_err_probe(dev, PTR_ERR(nt->reset_gpio),
+				     "Failed to get reset gpio\n");
+	}
+
+	/* If the panel is connected on two DSIs then DSI0 left, DSI1 right */
+	if (nt->desc->is_dual_dsi) {
+		info = &nt->desc->dsi_info;
+		dsi_r = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
+		if (!dsi_r) {
+			dev_err(dev, "Cannot get secondary DSI node.\n");
+			return -ENODEV;
+		}
+		dsi_r_host = of_find_mipi_dsi_host_by_node(dsi_r);
+		of_node_put(dsi_r);
+		if (!dsi_r_host) {
+			dev_err(dev, "Cannot get secondary DSI host\n");
+			return -EPROBE_DEFER;
+		}
+
+		nt->dsi[1] = mipi_dsi_device_register_full(dsi_r_host, info);
+		if (!nt->dsi[1]) {
+			dev_err(dev, "Cannot get secondary DSI node\n");
+			return -ENODEV;
+		}
+		num_dsis++;
+	}
+
+	nt->dsi[0] = dsi;
+	mipi_dsi_set_drvdata(dsi, nt);
+
+	drm_panel_init(&nt->panel, dev, &nt35950_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	ret = drm_panel_of_backlight(&nt->panel);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get backlight\n");
+
+	drm_panel_add(&nt->panel);
+
+	for (i = 0; i < num_dsis; i++) {
+		nt->dsi[i]->lanes = nt->desc->num_lanes;
+		nt->dsi[i]->format = MIPI_DSI_FMT_RGB888;
+
+		nt->dsi[i]->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS |
+					 MIPI_DSI_MODE_LPM;
+
+		if (nt->desc->mode_data[0].is_video_mode)
+			nt->dsi[i]->mode_flags |= MIPI_DSI_MODE_VIDEO;
+
+		ret = mipi_dsi_attach(nt->dsi[i]);
+		if (ret < 0) {
+			return dev_err_probe(dev, ret,
+					     "Cannot attach to DSI%d host.\n", i);
+		}
+	}
+
+	/* Make sure to set RESX LOW before starting the power-on sequence */
+	gpiod_set_value_cansleep(nt->reset_gpio, 0);
+	return 0;
+}
+
+static int nt35950_remove(struct mipi_dsi_device *dsi)
+{
+	struct nt35950 *nt = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(nt->dsi[0]);
+	if (ret < 0)
+		dev_err(&dsi->dev,
+			"Failed to detach from DSI0 host: %d\n", ret);
+
+	if (nt->dsi[1]) {
+		ret = mipi_dsi_detach(nt->dsi[1]);
+		if (ret < 0)
+			dev_err(&dsi->dev,
+				"Failed to detach from DSI1 host: %d\n", ret);
+		mipi_dsi_device_unregister(nt->dsi[1]);
+	};
+
+	drm_panel_remove(&nt->panel);
+
+	return 0;
+}
+
+static const struct nt35950_panel_mode sharp_ls055d1sx04_modes[] = {
+	{
+		/* 1920x1080 60Hz no compression */
+		.mode = {
+			.clock = 214537,
+			.hdisplay = 1080,
+			.hsync_start = 1080 + 400,
+			.hsync_end = 1080 + 400 + 40,
+			.htotal = 1080 + 400 + 40 + 300,
+			.vdisplay = 1920,
+			.vsync_start = 1920 + 12,
+			.vsync_end = 1920 + 12 + 2,
+			.vtotal = 1920 + 12 + 2 + 10,
+			.width_mm = 68,
+			.height_mm = 121,
+		},
+		.compression = MCS_DATA_COMPRESSION_NONE,
+		.enable_sram = true,
+		.is_video_mode = false,
+		.scaler_on = 1,
+		.scaler_mode = MCS_SCALEUP_DUPLICATE,
+	},
+	/* TODO: Add 2160x3840 60Hz when DSC is supported */
+};
+
+const struct nt35950_panel_desc sharp_ls055d1sx04 = {
+	.model_name = "Sharp LS055D1SX04",
+	.dsi_info = {
+		.type = "LS055D1SX04",
+		.channel = 0,
+		.node = NULL,
+	},
+	.mode_data = sharp_ls055d1sx04_modes,
+	.num_modes = ARRAY_SIZE(sharp_ls055d1sx04_modes),
+	.is_dual_dsi = true,
+	.num_lanes = 4,
+};
+
+static const struct of_device_id nt35950_of_match[] = {
+	{ .compatible = "sharp,ls055d1sx04", .data = &sharp_ls055d1sx04 },
+	{  }
+};
+MODULE_DEVICE_TABLE(of, nt35950_of_match);
+
+static struct mipi_dsi_driver nt35950_driver = {
+	.probe = nt35950_probe,
+	.remove = nt35950_remove,
+	.driver = {
+		.name = "panel-novatek-nt35950",
+		.of_match_table = nt35950_of_match,
+	},
+};
+module_mipi_dsi_driver(nt35950_driver);
+
+MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>");
+MODULE_DESCRIPTION("Novatek NT35950 DriverIC panels driver");
+MODULE_LICENSE("GPL v2");
-- 
2.32.0

[PATCH 2/2] dt-bindings: display: Add bindings for Novatek NT35950

[AngeloGioacchino Del Regno]

The nt35950 IC from Novatek is a Driver IC used to drive MIPI-DSI panels,
with Static RAM for content retention in command mode and also supports
video mode with VESA Frame Buffer Compression or Display Stream Compression
on single, or dual dsi port(s).
This DDIC is also capable of upscaling an input image to the panel's native
resolution, for example it can upscale a 1920x1080 input to 3840x2160 with
either bilinear interpolation or pixel duplication.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
---
 .../display/panel/novatek,nt35950.yaml        | 106 ++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml

diff --git a/Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml b/Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml
new file mode 100644
index 000000000000..377a05d48a02
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/novatek,nt35950.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Novatek NT35950-based display panels
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
+
+description: |
+  The nt35950 IC from Novatek is a Driver IC used to drive MIPI-DSI panels,
+  with Static RAM for content retention in command mode and also supports
+  video mode with VESA Frame Buffer Compression or Display Stream Compression
+  on single, or dual dsi port(s).
+  This DDIC is also capable of upscaling an input image to the panel's native
+  resolution, for example it can upscale a 1920x1080 input to 3840x2160 with
+  either bilinear interpolation or pixel duplication.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - sharp,ls055d1sx04
+      - const: novatek,nt35950
+    description: This indicates the panel manufacturer of the panel
+      that is in turn using the NT35950 panel driver. The compatible
+      string determines how the NT35950 panel driver shall be configured
+      to work with the indicated panel. The novatek,nt35950 compatible shall
+      always be provided as a fallback.
+
+  reset-gpios:
+    maxItems: 1
+    description: phandle of gpio for reset line - This should be 8mA, gpio
+      can be configured using mux, pinctrl, pinctrl-names (active high)
+
+  avdd-supply:
+    description: positive boost supply regulator
+  avee-supply:
+    description: negative boost supply regulator
+  dvdd-supply:
+    description: regulator that supplies the digital voltage
+  vddio-supply:
+    description: regulator that supplies the I/O voltage
+
+  backlight: true
+  ports: true
+  reg: true
+
+required:
+  - compatible
+  - reg
+  - reset-gpios
+  - avdd-supply
+  - avee-supply
+  - dvdd-supply
+  - vddio-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "sharp,ls055d1sx04", "novatek,nt35950";
+            reg = <0>;
+
+            backlight = <&pmi8998_wled>;
+            reset-gpios = <&tlmm 94 GPIO_ACTIVE_HIGH>;
+
+            avdd-supply = <&lab>;
+            avee-supply = <&ibb>;
+            dvdd-supply = <&disp_dvdd_vreg>;
+            vddio-supply = <&vreg_l14a_1p85>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    panel_in0: endpoint {
+                        remote-endpoint = <&dsi0_out>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+                    panel_in1: endpoint {
+                        remote-endpoint = <&dsi1_out>;
+                    };
+                };
+            };
+        };
+    };
+
+...
-- 
2.32.0

[PATCH 2/2] dt-bindings: display: Add bindings for Novatek NT35950

[AngeloGioacchino Del Regno]

The nt35950 IC from Novatek is a Driver IC used to drive MIPI-DSI panels,
with Static RAM for content retention in command mode and also supports
video mode with VESA Frame Buffer Compression or Display Stream Compression
on single, or dual dsi port(s).
This DDIC is also capable of upscaling an input image to the panel's native
resolution, for example it can upscale a 1920x1080 input to 3840x2160 with
either bilinear interpolation or pixel duplication.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
---
 .../display/panel/novatek,nt35950.yaml        | 106 ++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml

diff --git a/Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml b/Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml
new file mode 100644
index 000000000000..377a05d48a02
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/novatek,nt35950.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Novatek NT35950-based display panels
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
+
+description: |
+  The nt35950 IC from Novatek is a Driver IC used to drive MIPI-DSI panels,
+  with Static RAM for content retention in command mode and also supports
+  video mode with VESA Frame Buffer Compression or Display Stream Compression
+  on single, or dual dsi port(s).
+  This DDIC is also capable of upscaling an input image to the panel's native
+  resolution, for example it can upscale a 1920x1080 input to 3840x2160 with
+  either bilinear interpolation or pixel duplication.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - sharp,ls055d1sx04
+      - const: novatek,nt35950
+    description: This indicates the panel manufacturer of the panel
+      that is in turn using the NT35950 panel driver. The compatible
+      string determines how the NT35950 panel driver shall be configured
+      to work with the indicated panel. The novatek,nt35950 compatible shall
+      always be provided as a fallback.
+
+  reset-gpios:
+    maxItems: 1
+    description: phandle of gpio for reset line - This should be 8mA, gpio
+      can be configured using mux, pinctrl, pinctrl-names (active high)
+
+  avdd-supply:
+    description: positive boost supply regulator
+  avee-supply:
+    description: negative boost supply regulator
+  dvdd-supply:
+    description: regulator that supplies the digital voltage
+  vddio-supply:
+    description: regulator that supplies the I/O voltage
+
+  backlight: true
+  ports: true
+  reg: true
+
+required:
+  - compatible
+  - reg
+  - reset-gpios
+  - avdd-supply
+  - avee-supply
+  - dvdd-supply
+  - vddio-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "sharp,ls055d1sx04", "novatek,nt35950";
+            reg = <0>;
+
+            backlight = <&pmi8998_wled>;
+            reset-gpios = <&tlmm 94 GPIO_ACTIVE_HIGH>;
+
+            avdd-supply = <&lab>;
+            avee-supply = <&ibb>;
+            dvdd-supply = <&disp_dvdd_vreg>;
+            vddio-supply = <&vreg_l14a_1p85>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    panel_in0: endpoint {
+                        remote-endpoint = <&dsi0_out>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+                    panel_in1: endpoint {
+                        remote-endpoint = <&dsi1_out>;
+                    };
+                };
+            };
+        };
+    };
+
+...
-- 
2.32.0

Re: [PATCH 2/2] dt-bindings: display: Add bindings for Novatek NT35950

[Rob Herring]

On Wed, 01 Sep 2021 19:31:27 +0200, AngeloGioacchino Del Regno wrote:
> The nt35950 IC from Novatek is a Driver IC used to drive MIPI-DSI panels,
> with Static RAM for content retention in command mode and also supports
> video mode with VESA Frame Buffer Compression or Display Stream Compression
> on single, or dual dsi port(s).
> This DDIC is also capable of upscaling an input image to the panel's native
> resolution, for example it can upscale a 1920x1080 input to 3840x2160 with
> either bilinear interpolation or pixel duplication.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
> ---
>  .../display/panel/novatek,nt35950.yaml        | 106 ++++++++++++++++++
>  1 file changed, 106 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH 2/2] dt-bindings: display: Add bindings for Novatek NT35950

[Rob Herring]

On Wed, 01 Sep 2021 19:31:27 +0200, AngeloGioacchino Del Regno wrote:
> The nt35950 IC from Novatek is a Driver IC used to drive MIPI-DSI panels,
> with Static RAM for content retention in command mode and also supports
> video mode with VESA Frame Buffer Compression or Display Stream Compression
> on single, or dual dsi port(s).
> This DDIC is also capable of upscaling an input image to the panel's native
> resolution, for example it can upscale a 1920x1080 input to 3840x2160 with
> either bilinear interpolation or pixel duplication.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
> ---
>  .../display/panel/novatek,nt35950.yaml        | 106 ++++++++++++++++++
>  1 file changed, 106 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/novatek,nt35950.yaml
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH 1/2] drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels

[Marijn Suijten]

On 2021-09-01 19:31:26, AngeloGioacchino Del Regno wrote:
> Add a driver for panels using the Novatek NT35950 Display Driver IC,
> including support for the Sharp LS055D1SX04, found in some Sony Xperia
> Z5 Premium and XZ Premium smartphones.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>

Somehow this got lost in the heat of the moment:

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>

Re: [PATCH 1/2] drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels

[Marijn Suijten]

On 2021-09-01 19:31:26, AngeloGioacchino Del Regno wrote:
> Add a driver for panels using the Novatek NT35950 Display Driver IC,
> including support for the Sharp LS055D1SX04, found in some Sony Xperia
> Z5 Premium and XZ Premium smartphones.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>

Somehow this got lost in the heat of the moment:

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>

Re: [PATCH 1/2] drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels

[Sam Ravnborg]

Hi AngeloGioacchino,

On Wed, Sep 01, 2021 at 07:31:26PM +0200, AngeloGioacchino Del Regno wrote:
> Add a driver for panels using the Novatek NT35950 Display Driver IC,
> including support for the Sharp LS055D1SX04, found in some Sony Xperia
> Z5 Premium and XZ Premium smartphones.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>

Driver looks good and I have applied it to drm-misc-next.
As we cannot apply a driver without the bindings, the bindings patch was
applied first.
I also added the r-b from Marijn on the driver.

The patches will show up in -next in 1-2 weeks from now.

	Sam