From: Robert Foss <robert.foss@xxxxxxxxxx> commit d1a97648ae028a44536927c87837c45ada7141c9 upstream. 4k requires two dsi pipes, so don't report MODE_OK when only a single pipe is configured. But rather report MODE_PANEL to signal that requirements of the panel are not being met. Reported-by: Peter Collingbourne <pcc@xxxxxxxxxx> Suggested-by: Peter Collingbourne <pcc@xxxxxxxxxx> Signed-off-by: Robert Foss <robert.foss@xxxxxxxxxx> Tested-by: John Stultz <john.stultz@xxxxxxxxxx> Tested-by: Anibal Limon <anibal.limon@xxxxxxxxxx> Tested-by: Peter Collingbourne <pcc@xxxxxxxxxx> Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> Acked-by: Vinod Koul <vkoul@xxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20201217140933.1133969-1-robert.foss@xxxxxxxxxx Cc: Peter Collingbourne <pcc@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/bridge/lontium-lt9611.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -867,8 +867,14 @@ static enum drm_mode_status lt9611_bridg const struct drm_display_mode *mode) { struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode); + struct lt9611 *lt9611 = bridge_to_lt9611(bridge); - return lt9611_mode ? MODE_OK : MODE_BAD; + if (!lt9611_mode) + return MODE_BAD; + else if (lt9611_mode->intfs > 1 && !lt9611->dsi1) + return MODE_PANEL; + else + return MODE_OK; } static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
