Attachment 110680 Details for Bug 87172 – possible fix

[patch] possible fix

0001-drm-radeon-properly-filter-DP1.2-4k-modes-on-non-DP1.patch (text/plain), 1.29 KB, created by Alex Deucher on 2014-12-10 14:47:39 UTC

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Creator: Alex Deucher

Created: 2014-12-10 14:47:39 UTC

Size: 1.29 KB

patch

obsolete

>From 1c97cf204abec8583a53df0c5300209453b7a07c Mon Sep 17 00:00:00 2001
>From: Alex Deucher <alexander.deucher@amd.com>
>Date: Wed, 10 Dec 2014 09:42:10 -0500
>Subject: [PATCH] drm/radeon: properly filter DP1.2 4k modes on non-DP1.2 hw
>
>The check was already in place in the dp mode_valid check, but
>radeon_dp_get_dp_link_clock() never returned the high clock
>mode_valid was checking for because that function clipped the
>clock based on the hw capabilities.  Add an explicit check
>in the mode_valid function.
>
>bug:
>https://bugs.freedesktop.org/show_bug.cgi?id=87172
>
>Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
>Cc:stable@vge.kernel.org
>---
> drivers/gpu/drm/radeon/atombios_dp.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
>diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
>index 11ba9d2..db42a67 100644
>--- a/drivers/gpu/drm/radeon/atombios_dp.c
>+++ b/drivers/gpu/drm/radeon/atombios_dp.c
>@@ -492,6 +492,10 @@ int radeon_dp_mode_valid_helper(struct drm_connector *connector,
> 	struct radeon_connector_atom_dig *dig_connector;
> 	int dp_clock;
> 
>+	if ((mode->clock > 340000) &&
>+	    (!radeon_connector_is_dp12_capable(connector)))
>+		return MODE_CLOCK_HIGH;
>+
> 	if (!radeon_connector->con_priv)
> 		return MODE_CLOCK_HIGH;
> 	dig_connector = radeon_connector->con_priv;
>-- 
>1.8.3.1
>

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