RM-2110 dsi: minor tunings of dsi/panel per Tom's commands

The MB1166 still doesn't work good.
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
(cherry picked from commit be5ccd5b0a095f3fc93f8f3b33639965a2abaf18)

drivers/gpu/drm/imx/nwl_dsi-imx.c

@@ -35,6 +35,7 @@
 #include <linux/regmap.h>
 #include <soc/imx8/sc/sci.h>
 #include <video/videomode.h>
+#include <linux/gpio/consumer.h>
 
 #include "imx-drm.h"
 
@@ -920,6 +921,7 @@ static int imx_nwl_dsi_probe(struct platform_device *pdev)
 	struct device_node *remote_node, *endpoint;
 	int remote_ports = 0;
 	struct imx_mipi_dsi *dsi;
+	struct gpio_desc *reset_gpio;
 	int ret = 0;
 
 	if (!np)
@@ -963,6 +965,15 @@ static int imx_nwl_dsi_probe(struct platform_device *pdev)
 
 	pm_runtime_enable(dev);
 
+	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (reset_gpio) {
+		dev_info(dev, "Reset the panel\n");
+		gpiod_set_value_cansleep(reset_gpio, 1);
+		msleep(20);
+		gpiod_set_value_cansleep(reset_gpio, 0);
+		msleep(300);
+	}
+
 	if (of_property_read_bool(dev->of_node, "as_bridge")) {
 		ret = imx_nwl_dsi_parse_of(dev, true);
 		if (ret)

drivers/gpu/drm/panel/panel-orisetech-otm8009a.c

@@ -68,7 +68,7 @@ struct otm8009a {
 
 static const struct drm_display_mode default_mode = {
 #ifdef CONFIG_ARCH_FSL_IMX8MQ
-	.clock = 27000,
+	.clock = 24000,
 #else
 	.clock = 32729,
 #endif
@@ -224,6 +224,11 @@ static int otm8009a_init_sequence(struct otm8009a *ctx)
 	if (ret)
 		return ret;
 
+	/* Tearing mode */
+	ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	if (ret)
+		return ret;
+
 	/* Disable CABC feature */
 	dcs_write_seq(ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
 
@@ -381,7 +386,9 @@ static int otm8009a_backlight_update_status(struct backlight_device *bd)
 		 */
 		data[0] = MIPI_DCS_SET_DISPLAY_BRIGHTNESS;
 		data[1] = bd->props.brightness;
+#if 0
 		otm8009a_dcs_write_buf(ctx, data, ARRAY_SIZE(data));
+#endif
 
 		/* set Brightness Control & Backlight on */
 		data[1] = 0x24;
@@ -393,7 +400,9 @@ static int otm8009a_backlight_update_status(struct backlight_device *bd)
 
 	/* Update Brightness Control & Backlight */
 	data[0] = MIPI_DCS_WRITE_CONTROL_DISPLAY;
+#if 0
 	otm8009a_dcs_write_buf(ctx, data, ARRAY_SIZE(data));
+#endif
 
 	return 0;
 }
@@ -424,8 +433,13 @@ static int otm8009a_probe(struct mipi_dsi_device *dsi)
 
 	dsi->lanes = 2;
 	dsi->format = MIPI_DSI_FMT_RGB888;
+#if 0
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
 			  MIPI_DSI_MODE_LPM;
+#else
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM |
+			  MIPI_DSI_CLOCK_NON_CONTINUOUS;
+#endif
 
 	drm_panel_init(&ctx->panel);
 	ctx->panel.dev = dev;