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

[Dmitry Baryshkov]

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.barysh...@linaro.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