drm: Fix HDMI hot-plug problem

Fix HDMI hot-plug problem which occur at the time of switching from 4K@60 t0 1080p@60 monitor. Signed-off-by: forain <[email protected]>
ruyisdk · Jul 29, 2024 · f784858 · f784858
1 parent 2067e60
commit f784858
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2158,6 +2158,11 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
 				    HDMI_MC_SWRSTZ);
 			drm_scdc_set_scrambling(hdmi->curr_conn, 0);
 		}
+	} else {
+		hdmi_writeb(hdmi, 0, HDMI_FC_SCRAMBLER_CTRL);
+		hdmi_writeb(hdmi, (u8)~HDMI_MC_SWRSTZ_TMDSSWRST_REQ,
+			    HDMI_MC_SWRSTZ);
+		drm_scdc_set_scrambling(hdmi->curr_conn, 0);
 	}
 
 	/* Set up horizontal active pixel width */