From 99fc8e963a4c0203dba26a77cf737db6081bca14 Mon Sep 17 00:00:00 2001
From: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Date: Tue, 7 Nov 2017 19:56:20 +0300
Subject: [PATCH] drm/bridge: tc358767: filter out too high modes
Git-commit: 99fc8e963a4c0203dba26a77cf737db6081bca14
Patch-mainline: v4.15-rc2
References: bsc#1051510
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
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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;
}