Message-ID: <20240828182210.565861-1-tejasvipin76@gmail.com>
Date: Wed, 28 Aug 2024 23:52:10 +0530
From: Tejas Vipin <tejasvipin76@...il.com>
To: neil.armstrong@...aro.org,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	daniel@...ll.ch
Cc: quic_jesszhan@...cinc.com,
	dianders@...omium.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Tejas Vipin <tejasvipin76@...il.com>
Subject: [PATCH v2] drm/panel: novatek-nt35950: transition to mipi_dsi wrapped functions

Changes the novatek-nt35950 panel to use multi style functions for
improved error handling.

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Signed-off-by: Tejas Vipin <tejasvipin76@...il.com>
---
Changes in v2:
    - Style changes
    - Fixed changes in logic

v1: https://lore.kernel.org/all/20240824084422.202946-1-tejasvipin76@gmail.com/
---
 drivers/gpu/drm/panel/panel-novatek-nt35950.c | 211 ++++++------------
 1 file changed, 66 insertions(+), 145 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35950.c b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
index 028fdac293f7..b036208f9356 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35950.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
@@ -100,106 +100,87 @@ static void nt35950_reset(struct nt35950 *nt)
 
 /*
  * nt35950_set_cmd2_page - Select manufacturer control (CMD2) page
+ * @dsi_ctx: context for mipi_dsi functions
  * @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)
+static void nt35950_set_cmd2_page(struct mipi_dsi_multi_context *dsi_ctx,
+				  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,
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, mauc_cmd2_page,
 					ARRAY_SIZE(mauc_cmd2_page));
-	if (ret < 0)
-		return ret;
-
-	nt->last_page = page;
-	return 0;
+	if (!dsi_ctx->accum_err)
+		nt->last_page = page;
 }
 
 /*
  * nt35950_set_data_compression - Set data compression mode
+ * @dsi_ctx: context for mipi_dsi functions
  * @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)
+static void nt35950_set_data_compression(struct mipi_dsi_multi_context *dsi_ctx,
+					 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;
-	}
+	if (last_page != 0)
+		nt35950_set_cmd2_page(dsi_ctx, nt, 0);
 
-	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_data_compression,
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, 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,
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, 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;
+	nt35950_set_cmd2_page(dsi_ctx, nt, 4);
 
 	/* Display Stream Compression setting, always 0x03 */
-	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd_vesa_dsc_setting,
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, 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_cmd2_page(dsi_ctx, nt, last_page);
 }
 
 /*
  * nt35950_set_scaler - Enable/disable resolution upscaling
- * @nt:        Main driver structure
+ * @dsi_ctx: context for mipi_dsi functions
  * @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)
+static void nt35950_set_scaler(struct mipi_dsi_multi_context *dsi_ctx,
+			       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));
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, cmd_scaler,
+					ARRAY_SIZE(cmd_scaler));
 }
 
 /*
  * nt35950_set_scale_mode - Resolution upscaling mode
- * @nt:   Main driver structure
+ * @dsi_ctx: context for mipi_dsi functions
  * @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)
+static void nt35950_set_scale_mode(struct mipi_dsi_multi_context *dsi_ctx,
+				   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));
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, cmd_scaler,
+					ARRAY_SIZE(cmd_scaler));
 }
 
 /*
  * nt35950_inject_black_image - Display a completely black image
- * @nt:   Main driver structure
+ * @dsi_ctx: context for mipi_dsi functions
  *
  * After IC setup, the attached panel may show random data
  * due to driveric behavior changes (resolution, compression,
@@ -208,43 +189,34 @@ static int nt35950_set_scale_mode(struct nt35950 *nt, u8 mode)
  * 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)
+static void nt35950_inject_black_image(struct mipi_dsi_multi_context *dsi_ctx)
 {
 	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;
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, cmd_test, ARRAY_SIZE(cmd_test));
 
 	/* Send a black image */
-	ret = mipi_dsi_dcs_write_buffer(nt->dsi[0], cmd0_black_img,
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, 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,
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, 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));
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, 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
+ * @dsi_ctx: context for mipi_dsi functions
  */
-static int nt35950_set_dispout(struct nt35950 *nt)
+static void nt35950_set_dispout(struct mipi_dsi_multi_context *dsi_ctx,
+				struct nt35950 *nt)
 {
 	u8 cmd_dispout[] = { MCS_PARAM_DISP_OUTPUT_CTRL, 0x00 };
 	const struct nt35950_panel_mode *mode_data = nt->desc->mode_data;
@@ -254,8 +226,8 @@ static int nt35950_set_dispout(struct nt35950 *nt)
 	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));
+	mipi_dsi_dcs_write_buffer_multi(dsi_ctx, cmd_dispout,
+					ARRAY_SIZE(cmd_dispout));
 }
 
 static int nt35950_get_current_mode(struct nt35950 *nt)
@@ -284,78 +256,47 @@ 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;
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
 
 	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;
+	nt35950_set_cmd2_page(&dsi_ctx, nt, 0);
+	nt35950_set_data_compression(&dsi_ctx, nt, mode_data[nt->cur_mode].compression);
+	nt35950_set_scale_mode(&dsi_ctx, mode_data[nt->cur_mode].scaler_mode);
+	nt35950_set_scaler(&dsi_ctx, mode_data[nt->cur_mode].scaler_on);
+	nt35950_set_dispout(&dsi_ctx, nt);
 
-	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;
-	}
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	mipi_dsi_dcs_set_tear_scanline_multi(&dsi_ctx, 0);
 
 	/* CMD2 Page 1 */
-	ret = nt35950_set_cmd2_page(nt, 1);
-	if (ret < 0)
-		return ret;
+	nt35950_set_cmd2_page(&dsi_ctx, nt, 1);
 
 	/* Unknown command */
-	mipi_dsi_dcs_write_seq(dsi, 0xd4, 0x88, 0x88);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xd4, 0x88, 0x88);
 
 	/* CMD2 Page 7 */
-	ret = nt35950_set_cmd2_page(nt, 7);
-	if (ret < 0)
-		return ret;
+	nt35950_set_cmd2_page(&dsi_ctx, nt, 7);
 
 	/* Enable SubPixel Rendering */
-	mipi_dsi_dcs_write_seq(dsi, MCS_PARAM_SPR_EN, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PARAM_SPR_EN, 0x01);
 
 	/* SPR Mode: YYG Rainbow-RGB */
-	mipi_dsi_dcs_write_seq(dsi, MCS_PARAM_SPR_MODE, MCS_SPR_MODE_YYG_RAINBOW_RGB);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PARAM_SPR_MODE,
+				     MCS_SPR_MODE_YYG_RAINBOW_RGB);
 
 	/* CMD3 */
-	ret = nt35950_inject_black_image(nt);
-	if (ret < 0)
-		return ret;
+	nt35950_inject_black_image(&dsi_ctx);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 120);
 
-	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
-	if (ret < 0)
-		return ret;
-	msleep(120);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 120);
 
-	ret = mipi_dsi_dcs_set_display_on(dsi);
-	if (ret < 0)
-		return ret;
-	msleep(120);
+	if (dsi_ctx.accum_err)
+		return dsi_ctx.accum_err;
 
 	nt->dsi[0]->mode_flags &= ~MIPI_DSI_MODE_LPM;
 	nt->dsi[1]->mode_flags &= ~MIPI_DSI_MODE_LPM;
@@ -363,30 +304,19 @@ static int nt35950_on(struct nt35950 *nt)
 	return 0;
 }
 
-static int nt35950_off(struct nt35950 *nt)
+static void nt35950_off(struct nt35950 *nt)
 {
-	struct device *dev = &nt->dsi[0]->dev;
-	int ret;
+	struct mipi_dsi_device *dsi = nt->dsi[0];
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
 
-	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);
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_usleep_range(&dsi_ctx, 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);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 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)
@@ -427,7 +357,6 @@ static int nt35950_sharp_init_vregs(struct nt35950 *nt, struct device *dev)
 static int nt35950_prepare(struct drm_panel *panel)
 {
 	struct nt35950 *nt = to_nt35950(panel);
-	struct device *dev = &nt->dsi[0]->dev;
 	int ret;
 
 	ret = regulator_enable(nt->vregs[0].consumer);
@@ -452,10 +381,6 @@ static int nt35950_prepare(struct drm_panel *panel)
 	nt35950_reset(nt);
 
 	ret = nt35950_on(nt);
-	if (ret < 0) {
-		dev_err(dev, "Failed to initialize panel: %d\n", ret);
-		goto end;
-	}
 
 end:
 	if (ret < 0) {
@@ -469,12 +394,8 @@ static int nt35950_prepare(struct drm_panel *panel)
 static int nt35950_unprepare(struct drm_panel *panel)
 {
 	struct nt35950 *nt = to_nt35950(panel);
-	struct device *dev = &nt->dsi[0]->dev;
-	int ret;
 
-	ret = nt35950_off(nt);
-	if (ret < 0)
-		dev_err(dev, "Failed to deinitialize panel: %d\n", ret);
+	nt35950_off(nt);
 
 	gpiod_set_value_cansleep(nt->reset_gpio, 0);
 	regulator_bulk_disable(ARRAY_SIZE(nt->vregs), nt->vregs);
-- 
2.46.0

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