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[v3,2/7] drm/bridge: tc358767: filter out too high modes

Message ID 1510073785-16108-3-git-send-email-andrey.gusakov@cogentembedded.com (mailing list archive)
State New, archived
Headers show

Commit Message

Andrey Gusakov Nov. 7, 2017, 4:56 p.m. UTC 
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>
---
 drivers/gpu/drm/bridge/tc358767.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index d52cd41..948a486 100644
--- 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 drm_bridge *bridge,
 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;
 }