linux-kernel - [PATCH RFC 6/7] drm/panel: lg-sw43408: add missing error handling

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Message-Id: <20240510-dsi-panels-upd-api-v1-6-317c78a0dcc8@linaro.org>
Date: Fri, 10 May 2024 01:37:39 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Douglas Anderson <dianders@...omium.org>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 Sumit Semwal <sumit.semwal@...aro.org>, 
 Caleb Connolly <caleb.connolly@...aro.org>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 Vinod Koul <vkoul@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH RFC 6/7] drm/panel: lg-sw43408: add missing error handling

Add missing error handling for the mipi_dsi_ functions that actually
return error code instead of silently ignoring it.

Fixes: 069a6c0e94f9 ("drm: panel: Add LG sw43408 panel driver")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/panel/panel-lg-sw43408.c | 33 ++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-lg-sw43408.c b/drivers/gpu/drm/panel/panel-lg-sw43408.c
index 2b3a73696dce..67a98ac508f8 100644
--- a/drivers/gpu/drm/panel/panel-lg-sw43408.c
+++ b/drivers/gpu/drm/panel/panel-lg-sw43408.c
@@ -62,16 +62,25 @@ static int sw43408_program(struct drm_panel *panel)
 {
 	struct sw43408_panel *ctx = to_panel_info(panel);
 	struct drm_dsc_picture_parameter_set pps;
+	int ret;
 
 	mipi_dsi_dcs_write_seq(ctx->link, MIPI_DCS_SET_GAMMA_CURVE, 0x02);
 
-	mipi_dsi_dcs_set_tear_on(ctx->link, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	ret = mipi_dsi_dcs_set_tear_on(ctx->link, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	if (ret < 0) {
+		dev_err(panel->dev, "Failed to set tearing: %d\n", ret);
+		return ret;
+	}
 
 	mipi_dsi_dcs_write_seq(ctx->link, 0x53, 0x0c, 0x30);
 	mipi_dsi_dcs_write_seq(ctx->link, 0x55, 0x00, 0x70, 0xdf, 0x00, 0x70, 0xdf);
 	mipi_dsi_dcs_write_seq(ctx->link, 0xf7, 0x01, 0x49, 0x0c);
 
-	mipi_dsi_dcs_exit_sleep_mode(ctx->link);
+	ret = mipi_dsi_dcs_exit_sleep_mode(ctx->link);
+	if (ret < 0) {
+		dev_err(panel->dev, "Failed to exit sleep mode: %d\n", ret);
+		return ret;
+	}
 
 	msleep(135);
 
@@ -97,14 +106,22 @@ static int sw43408_program(struct drm_panel *panel)
 	mipi_dsi_dcs_write_seq(ctx->link, 0x55, 0x04, 0x61, 0xdb, 0x04, 0x70, 0xdb);
 	mipi_dsi_dcs_write_seq(ctx->link, 0xb0, 0xca);
 
-	mipi_dsi_dcs_set_display_on(ctx->link);
+	ret = mipi_dsi_dcs_set_display_on(ctx->link);
+	if (ret < 0) {
+		dev_err(panel->dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
 
 	msleep(50);
 
 	ctx->link->mode_flags &= ~MIPI_DSI_MODE_LPM;
 
 	drm_dsc_pps_payload_pack(&pps, ctx->link->dsc);
-	mipi_dsi_picture_parameter_set(ctx->link, &pps);
+	ret = mipi_dsi_picture_parameter_set(ctx->link, &pps);
+	if (ret < 0) {
+		dev_err(panel->dev, "Failed to set PPS: %d\n", ret);
+		return ret;
+	}
 
 	ctx->link->mode_flags |= MIPI_DSI_MODE_LPM;
 
@@ -113,8 +130,12 @@ static int sw43408_program(struct drm_panel *panel)
 	 * PPS 1 if pps_identifier is 0
 	 * PPS 2 if pps_identifier is 1
 	 */
-	mipi_dsi_compression_mode_ext(ctx->link, true,
-				      MIPI_DSI_COMPRESSION_DSC, 1);
+	ret = mipi_dsi_compression_mode_ext(ctx->link, true,
+					    MIPI_DSI_COMPRESSION_DSC, 1);
+	if (ret < 0) {
+		dev_err(panel->dev, "Failed to set compression mode: %d\n", ret);
+		return ret;
+	}
 
 	return 0;
 }

-- 
2.39.2