linux-kernel - [PATCH AUTOSEL for 4.9 41/55] drm/bridge: tc358767: filter out too high modes

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Message-ID: <20180124041521.32223-41-alexander.levin@microsoft.com>
Date:   Wed, 24 Jan 2018 04:15:50 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Andrey Gusakov <andrey.gusakov@...entembedded.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 41/55] drm/bridge: tc358767: filter out too
 high modes

From: Andrey Gusakov <andrey.gusakov@...entembedded.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@...sung.com>
Signed-off-by: Andrey Gusakov <andrey.gusakov@...entembedded.com>
Signed-off-by: Andrzej Hajda <a.hajda@...sung.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@...rosoft.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/tc358767.c
index 14b4e58f727f..97087f962363 100644
--- 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 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;
 }
 
-- 
2.11.0