| From foo@baz Thu Feb 1 14:00:34 CET 2018 |
| From: Andrey Gusakov <andrey.gusakov@cogentembedded.com> |
| Date: Tue, 7 Nov 2017 19:56:20 +0300 |
| Subject: drm/bridge: tc358767: filter out too high modes |
| |
| From: Andrey Gusakov <andrey.gusakov@cogentembedded.com> |
| |
| |
| [ Upstream commit 99fc8e963a4c0203dba26a77cf737db6081bca14 ] |
| |
| Pixel clock limitation for DPI is 154 MHz. Do not accept modes |
| with higher pixel clock rate. |
| |
| Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> |
| Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com> |
| Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> |
| Link: https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-3-git-send-email-andrey.gusakov@cogentembedded.com |
| Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| drivers/gpu/drm/bridge/tc358767.c | 5 ++++- |
| 1 file changed, 4 insertions(+), 1 deletion(-) |
| |
| --- a/drivers/gpu/drm/bridge/tc358767.c |
| +++ b/drivers/gpu/drm/bridge/tc358767.c |
| @@ -1109,7 +1109,10 @@ static bool tc_bridge_mode_fixup(struct |
| static int tc_connector_mode_valid(struct drm_connector *connector, |
| struct drm_display_mode *mode) |
| { |
| - /* Accept any mode */ |
| + /* DPI interface clock limitation: upto 154 MHz */ |
| + if (mode->clock > 154000) |
| + return MODE_CLOCK_HIGH; |
| + |
| return MODE_OK; |
| } |
| |