4.9-stable review patch. If anyone has any objections, please let me know.
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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-em... 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; }