From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/gpu/drm/panel/panel-novatek-nt35560.c | 558 ++++++++++++++++++++++++++
 1 file changed, 558 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-novatek-nt35560.c

(limited to 'drivers/gpu/drm/panel/panel-novatek-nt35560.c')

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35560.c b/drivers/gpu/drm/panel/panel-novatek-nt35560.c
new file mode 100644
index 0000000000..5bbea73412
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35560.c
@@ -0,0 +1,558 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * MIPI-DSI Novatek NT35560-based panel controller.
+ *
+ * Supported panels include:
+ * Sony ACX424AKM - a 480x854 AMOLED DSI panel
+ * Sony ACX424AKP - a 480x864 AMOLED DSI panel
+ *
+ * Copyright (C) Linaro Ltd. 2019-2021
+ * Author: Linus Walleij
+ * Based on code and know-how from Marcus Lorentzon
+ * Copyright (C) ST-Ericsson SA 2010
+ * Based on code and know-how from Johan Olson and Joakim Wesslen
+ * Copyright (C) Sony Ericsson Mobile Communications 2010
+ */
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#define NT35560_DCS_READ_ID1		0xDA
+#define NT35560_DCS_READ_ID2		0xDB
+#define NT35560_DCS_READ_ID3		0xDC
+#define NT35560_DCS_SET_MDDI		0xAE
+
+/*
+ * Sony seems to use vendor ID 0x81
+ */
+#define DISPLAY_SONY_ACX424AKP_ID1	0x8103
+#define DISPLAY_SONY_ACX424AKP_ID2	0x811a
+#define DISPLAY_SONY_ACX424AKP_ID3	0x811b
+/*
+ * The fourth ID looks like a bug, vendor IDs begin at 0x80
+ * and panel 00 ... seems like default values.
+ */
+#define DISPLAY_SONY_ACX424AKP_ID4	0x8000
+
+struct nt35560_config {
+	const struct drm_display_mode *vid_mode;
+	const struct drm_display_mode *cmd_mode;
+};
+
+struct nt35560 {
+	const struct nt35560_config *conf;
+	struct drm_panel panel;
+	struct device *dev;
+	struct regulator *supply;
+	struct gpio_desc *reset_gpio;
+	bool video_mode;
+};
+
+static const struct drm_display_mode sony_acx424akp_vid_mode = {
+	.clock = 27234,
+	.hdisplay = 480,
+	.hsync_start = 480 + 15,
+	.hsync_end = 480 + 15 + 0,
+	.htotal = 480 + 15 + 0 + 15,
+	.vdisplay = 864,
+	.vsync_start = 864 + 14,
+	.vsync_end = 864 + 14 + 1,
+	.vtotal = 864 + 14 + 1 + 11,
+	.width_mm = 48,
+	.height_mm = 84,
+	.flags = DRM_MODE_FLAG_PVSYNC,
+};
+
+/*
+ * The timings are not very helpful as the display is used in
+ * command mode using the maximum HS frequency.
+ */
+static const struct drm_display_mode sony_acx424akp_cmd_mode = {
+	.clock = 35478,
+	.hdisplay = 480,
+	.hsync_start = 480 + 154,
+	.hsync_end = 480 + 154 + 16,
+	.htotal = 480 + 154 + 16 + 32,
+	.vdisplay = 864,
+	.vsync_start = 864 + 1,
+	.vsync_end = 864 + 1 + 1,
+	.vtotal = 864 + 1 + 1 + 1,
+	/*
+	 * Some desired refresh rate, experiments at the maximum "pixel"
+	 * clock speed (HS clock 420 MHz) yields around 117Hz.
+	 */
+	.width_mm = 48,
+	.height_mm = 84,
+};
+
+static const struct nt35560_config sony_acx424akp_data = {
+	.vid_mode = &sony_acx424akp_vid_mode,
+	.cmd_mode = &sony_acx424akp_cmd_mode,
+};
+
+static const struct drm_display_mode sony_acx424akm_vid_mode = {
+	.clock = 27234,
+	.hdisplay = 480,
+	.hsync_start = 480 + 15,
+	.hsync_end = 480 + 15 + 0,
+	.htotal = 480 + 15 + 0 + 15,
+	.vdisplay = 854,
+	.vsync_start = 854 + 14,
+	.vsync_end = 854 + 14 + 1,
+	.vtotal = 854 + 14 + 1 + 11,
+	.width_mm = 46,
+	.height_mm = 82,
+	.flags = DRM_MODE_FLAG_PVSYNC,
+};
+
+/*
+ * The timings are not very helpful as the display is used in
+ * command mode using the maximum HS frequency.
+ */
+static const struct drm_display_mode sony_acx424akm_cmd_mode = {
+	.clock = 35478,
+	.hdisplay = 480,
+	.hsync_start = 480 + 154,
+	.hsync_end = 480 + 154 + 16,
+	.htotal = 480 + 154 + 16 + 32,
+	.vdisplay = 854,
+	.vsync_start = 854 + 1,
+	.vsync_end = 854 + 1 + 1,
+	.vtotal = 854 + 1 + 1 + 1,
+	.width_mm = 46,
+	.height_mm = 82,
+};
+
+static const struct nt35560_config sony_acx424akm_data = {
+	.vid_mode = &sony_acx424akm_vid_mode,
+	.cmd_mode = &sony_acx424akm_cmd_mode,
+};
+
+static inline struct nt35560 *panel_to_nt35560(struct drm_panel *panel)
+{
+	return container_of(panel, struct nt35560, panel);
+}
+
+#define FOSC			20 /* 20Mhz */
+#define SCALE_FACTOR_NS_DIV_MHZ	1000
+
+static int nt35560_set_brightness(struct backlight_device *bl)
+{
+	struct nt35560 *nt = bl_get_data(bl);
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
+	int period_ns = 1023;
+	int duty_ns = bl->props.brightness;
+	u8 pwm_ratio;
+	u8 pwm_div;
+	u8 par;
+	int ret;
+
+	if (backlight_is_blank(bl)) {
+		/* Disable backlight */
+		par = 0x00;
+		ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+					 &par, 1);
+		if (ret) {
+			dev_err(nt->dev, "failed to disable display backlight (%d)\n", ret);
+			return ret;
+		}
+		return 0;
+	}
+
+	/* Calculate the PWM duty cycle in n/256's */
+	pwm_ratio = max(((duty_ns * 256) / period_ns) - 1, 1);
+	pwm_div = max(1,
+		      ((FOSC * period_ns) / 256) /
+		      SCALE_FACTOR_NS_DIV_MHZ);
+
+	/* Set up PWM dutycycle ONE byte (differs from the standard) */
+	dev_dbg(nt->dev, "calculated duty cycle %02x\n", pwm_ratio);
+	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
+				 &pwm_ratio, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "failed to set display PWM ratio (%d)\n", ret);
+		return ret;
+	}
+
+	/*
+	 * Sequence to write PWMDIV:
+	 *	address		data
+	 *	0xF3		0xAA   CMD2 Unlock
+	 *	0x00		0x01   Enter CMD2 page 0
+	 *	0X7D		0x01   No reload MTP of CMD2 P1
+	 *	0x22		PWMDIV
+	 *	0x7F		0xAA   CMD2 page 1 lock
+	 */
+	par = 0xaa;
+	ret = mipi_dsi_dcs_write(dsi, 0xf3, &par, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "failed to unlock CMD 2 (%d)\n", ret);
+		return ret;
+	}
+	par = 0x01;
+	ret = mipi_dsi_dcs_write(dsi, 0x00, &par, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "failed to enter page 1 (%d)\n", ret);
+		return ret;
+	}
+	par = 0x01;
+	ret = mipi_dsi_dcs_write(dsi, 0x7d, &par, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "failed to disable MTP reload (%d)\n", ret);
+		return ret;
+	}
+	ret = mipi_dsi_dcs_write(dsi, 0x22, &pwm_div, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "failed to set PWM divisor (%d)\n", ret);
+		return ret;
+	}
+	par = 0xaa;
+	ret = mipi_dsi_dcs_write(dsi, 0x7f, &par, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "failed to lock CMD 2 (%d)\n", ret);
+		return ret;
+	}
+
+	/* Enable backlight */
+	par = 0x24;
+	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+				 &par, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "failed to enable display backlight (%d)\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct backlight_ops nt35560_bl_ops = {
+	.update_status = nt35560_set_brightness,
+};
+
+static const struct backlight_properties nt35560_bl_props = {
+	.type = BACKLIGHT_RAW,
+	.brightness = 512,
+	.max_brightness = 1023,
+};
+
+static int nt35560_read_id(struct nt35560 *nt)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
+	u8 vendor, version, panel;
+	u16 val;
+	int ret;
+
+	ret = mipi_dsi_dcs_read(dsi, NT35560_DCS_READ_ID1, &vendor, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "could not vendor ID byte\n");
+		return ret;
+	}
+	ret = mipi_dsi_dcs_read(dsi, NT35560_DCS_READ_ID2, &version, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "could not read device version byte\n");
+		return ret;
+	}
+	ret = mipi_dsi_dcs_read(dsi, NT35560_DCS_READ_ID3, &panel, 1);
+	if (ret < 0) {
+		dev_err(nt->dev, "could not read panel ID byte\n");
+		return ret;
+	}
+
+	if (vendor == 0x00) {
+		dev_err(nt->dev, "device vendor ID is zero\n");
+		return -ENODEV;
+	}
+
+	val = (vendor << 8) | panel;
+	switch (val) {
+	case DISPLAY_SONY_ACX424AKP_ID1:
+	case DISPLAY_SONY_ACX424AKP_ID2:
+	case DISPLAY_SONY_ACX424AKP_ID3:
+	case DISPLAY_SONY_ACX424AKP_ID4:
+		dev_info(nt->dev, "MTP vendor: %02x, version: %02x, panel: %02x\n",
+			 vendor, version, panel);
+		break;
+	default:
+		dev_info(nt->dev, "unknown vendor: %02x, version: %02x, panel: %02x\n",
+			 vendor, version, panel);
+		break;
+	}
+
+	return 0;
+}
+
+static int nt35560_power_on(struct nt35560 *nt)
+{
+	int ret;
+
+	ret = regulator_enable(nt->supply);
+	if (ret) {
+		dev_err(nt->dev, "failed to enable supply (%d)\n", ret);
+		return ret;
+	}
+
+	/* Assert RESET */
+	gpiod_set_value_cansleep(nt->reset_gpio, 1);
+	udelay(20);
+	/* De-assert RESET */
+	gpiod_set_value_cansleep(nt->reset_gpio, 0);
+	usleep_range(11000, 20000);
+
+	return 0;
+}
+
+static void nt35560_power_off(struct nt35560 *nt)
+{
+	/* Assert RESET */
+	gpiod_set_value_cansleep(nt->reset_gpio, 1);
+	usleep_range(11000, 20000);
+
+	regulator_disable(nt->supply);
+}
+
+static int nt35560_prepare(struct drm_panel *panel)
+{
+	struct nt35560 *nt = panel_to_nt35560(panel);
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
+	const u8 mddi = 3;
+	int ret;
+
+	ret = nt35560_power_on(nt);
+	if (ret)
+		return ret;
+
+	ret = nt35560_read_id(nt);
+	if (ret) {
+		dev_err(nt->dev, "failed to read panel ID (%d)\n", ret);
+		goto err_power_off;
+	}
+
+	/* Enabe tearing mode: send TE (tearing effect) at VBLANK */
+	ret = mipi_dsi_dcs_set_tear_on(dsi,
+				       MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	if (ret) {
+		dev_err(nt->dev, "failed to enable vblank TE (%d)\n", ret);
+		goto err_power_off;
+	}
+
+	/*
+	 * Set MDDI
+	 *
+	 * This presumably deactivates the Qualcomm MDDI interface and
+	 * selects DSI, similar code is found in other drivers such as the
+	 * Sharp LS043T1LE01 which makes us suspect that this panel may be
+	 * using a Novatek NT35565 or similar display driver chip that shares
+	 * this command. Due to the lack of documentation we cannot know for
+	 * sure.
+	 */
+	ret = mipi_dsi_dcs_write(dsi, NT35560_DCS_SET_MDDI,
+				 &mddi, sizeof(mddi));
+	if (ret < 0) {
+		dev_err(nt->dev, "failed to set MDDI (%d)\n", ret);
+		goto err_power_off;
+	}
+
+	/* Exit sleep mode */
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret) {
+		dev_err(nt->dev, "failed to exit sleep mode (%d)\n", ret);
+		goto err_power_off;
+	}
+	msleep(140);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret) {
+		dev_err(nt->dev, "failed to turn display on (%d)\n", ret);
+		goto err_power_off;
+	}
+	if (nt->video_mode) {
+		/* In video mode turn peripheral on */
+		ret = mipi_dsi_turn_on_peripheral(dsi);
+		if (ret) {
+			dev_err(nt->dev, "failed to turn on peripheral\n");
+			goto err_power_off;
+		}
+	}
+
+	return 0;
+
+err_power_off:
+	nt35560_power_off(nt);
+	return ret;
+}
+
+static int nt35560_unprepare(struct drm_panel *panel)
+{
+	struct nt35560 *nt = panel_to_nt35560(panel);
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
+	int ret;
+
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret) {
+		dev_err(nt->dev, "failed to turn display off (%d)\n", ret);
+		return ret;
+	}
+
+	/* Enter sleep mode */
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret) {
+		dev_err(nt->dev, "failed to enter sleep mode (%d)\n", ret);
+		return ret;
+	}
+	msleep(85);
+
+	nt35560_power_off(nt);
+
+	return 0;
+}
+
+
+static int nt35560_get_modes(struct drm_panel *panel,
+			     struct drm_connector *connector)
+{
+	struct nt35560 *nt = panel_to_nt35560(panel);
+	const struct nt35560_config *conf = nt->conf;
+	struct drm_display_mode *mode;
+
+	if (nt->video_mode)
+		mode = drm_mode_duplicate(connector->dev,
+					  conf->vid_mode);
+	else
+		mode = drm_mode_duplicate(connector->dev,
+					  conf->cmd_mode);
+	if (!mode) {
+		dev_err(panel->dev, "bad mode or failed to add mode\n");
+		return -EINVAL;
+	}
+	drm_mode_set_name(mode);
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+
+	drm_mode_probed_add(connector, mode);
+
+	return 1; /* Number of modes */
+}
+
+static const struct drm_panel_funcs nt35560_drm_funcs = {
+	.unprepare = nt35560_unprepare,
+	.prepare = nt35560_prepare,
+	.get_modes = nt35560_get_modes,
+};
+
+static int nt35560_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct nt35560 *nt;
+	int ret;
+
+	nt = devm_kzalloc(dev, sizeof(struct nt35560), GFP_KERNEL);
+	if (!nt)
+		return -ENOMEM;
+	nt->video_mode = of_property_read_bool(dev->of_node,
+						"enforce-video-mode");
+
+	mipi_dsi_set_drvdata(dsi, nt);
+	nt->dev = dev;
+
+	nt->conf = of_device_get_match_data(dev);
+	if (!nt->conf) {
+		dev_err(dev, "missing device configuration\n");
+		return -ENODEV;
+	}
+
+	dsi->lanes = 2;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	/*
+	 * FIXME: these come from the ST-Ericsson vendor driver for the
+	 * HREF520 and seems to reflect limitations in the PLLs on that
+	 * platform, if you have the datasheet, please cross-check the
+	 * actual max rates.
+	 */
+	dsi->lp_rate = 19200000;
+	dsi->hs_rate = 420160000;
+
+	if (nt->video_mode)
+		/* Burst mode using event for sync */
+		dsi->mode_flags =
+			MIPI_DSI_MODE_VIDEO |
+			MIPI_DSI_MODE_VIDEO_BURST;
+	else
+		dsi->mode_flags =
+			MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+	nt->supply = devm_regulator_get(dev, "vddi");
+	if (IS_ERR(nt->supply))
+		return PTR_ERR(nt->supply);
+
+	/* This asserts RESET by default */
+	nt->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+						 GPIOD_OUT_HIGH);
+	if (IS_ERR(nt->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(nt->reset_gpio),
+				     "failed to request GPIO\n");
+
+	drm_panel_init(&nt->panel, dev, &nt35560_drm_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	nt->panel.backlight = devm_backlight_device_register(dev, "nt35560", dev, nt,
+					&nt35560_bl_ops, &nt35560_bl_props);
+	if (IS_ERR(nt->panel.backlight))
+		return dev_err_probe(dev, PTR_ERR(nt->panel.backlight),
+				     "failed to register backlight device\n");
+
+	drm_panel_add(&nt->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		drm_panel_remove(&nt->panel);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void nt35560_remove(struct mipi_dsi_device *dsi)
+{
+	struct nt35560 *nt = mipi_dsi_get_drvdata(dsi);
+
+	mipi_dsi_detach(dsi);
+	drm_panel_remove(&nt->panel);
+}
+
+static const struct of_device_id nt35560_of_match[] = {
+	{
+		.compatible = "sony,acx424akp",
+		.data = &sony_acx424akp_data,
+	},
+	{
+		.compatible = "sony,acx424akm",
+		.data = &sony_acx424akm_data,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, nt35560_of_match);
+
+static struct mipi_dsi_driver nt35560_driver = {
+	.probe = nt35560_probe,
+	.remove = nt35560_remove,
+	.driver = {
+		.name = "panel-novatek-nt35560",
+		.of_match_table = nt35560_of_match,
+	},
+};
+module_mipi_dsi_driver(nt35560_driver);
+
+MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
+MODULE_DESCRIPTION("MIPI-DSI Novatek NT35560 Panel Driver");
+MODULE_LICENSE("GPL v2");
-- 
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