drm/bridge: cdns-dsi: Check return value when getting default PHY config

commit c6a7ef0 upstream.

Check for the return value of the phy_mipi_dphy_get_default_config()
call, and in case of an error, return back the same.

Fixes: fced5a3 ("drm/bridge: cdns: Convert to phy framework")
Cc: [email protected]
Reviewed-by: Tomi Valkeinen <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Tested-by: Tomi Valkeinen <[email protected]>
Signed-off-by: Aradhya Bhatia <[email protected]>
Signed-off-by: Aradhya Bhatia <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Aradhya Bhatia

drivers/gpu/drm/bridge/cdns-dsi.c

@@ -616,9 +616,11 @@ static int cdns_dsi_check_conf(struct cdns_dsi *dsi,
 	if (ret)
 		return ret;
 
-	phy_mipi_dphy_get_default_config(mode_clock * 1000,
-					 mipi_dsi_pixel_format_to_bpp(output->dev->format),
-					 nlanes, phy_cfg);
+	ret = phy_mipi_dphy_get_default_config(mode_clock * 1000,
+					       mipi_dsi_pixel_format_to_bpp(output->dev->format),
+					       nlanes, phy_cfg);
+	if (ret)
+		return ret;
 
 	ret = cdns_dsi_adjust_phy_config(dsi, dsi_cfg, phy_cfg, mode, mode_valid_check);
 	if (ret)