4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrey Gusakov <andrey.gusa...@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.ha...@samsung.com>
Signed-off-by: Andrey Gusakov <andrey.gusa...@cogentembedded.com>
Signed-off-by: Andrzej Hajda <a.ha...@samsung.com>
Link: 
https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-3-git-send-email-andrey.gusa...@cogentembedded.com
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@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
@@ -1103,7 +1103,10 @@ 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;
 }
 


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