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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Andrey Gusakov <andrey.gusakov@cogentembedded.com>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.14 081/100] drm/bridge: tc358767: filter out too
 high modes
Thread-Topic: [PATCH AUTOSEL for 4.14 081/100] drm/bridge: tc358767: filter
 out too high modes
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Date:   Wed, 24 Jan 2018 04:15:07 +0000
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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-email-andrey.gusakov@cogentembedded.com
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/gpu/drm/bridge/tc358767.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc3=
58767.c
index e1996dbfb0a1..e571b5e29ae7 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;
 }
=20
--=20
2.11.0