Thanks. Confirmed that this fixes display output for me on a 4K monitor.
On Mon, Nov 23, 2020 at 2:46 AM Robert Foss <robert.foss@xxxxxxxxxx> wrote:
>
> 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: Peter Collingbourne <pcc@xxxxxxxxxx>
> ---
> drivers/gpu/drm/bridge/lontium-lt9611.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
> index d734d9402c35..e8eb8deb444b 100644
> --- 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_bridge_mode_valid(struct drm_bridge *bridge,
> 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)
> --
> 2.27.0
>
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