linux-kernel - [PATCH 3.11 189/272] drm/radeon: re-enable sw ACR support on pre-DCE4

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Message-Id: <1386334761-25517-190-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  6 Dec 2013 12:57:58 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alex Deucher <alexander.deucher@....com>,
	Rafał Miłecki <zajec5@...il.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 189/272] drm/radeon: re-enable sw ACR support on pre-DCE4

3.11.10.1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@....com>

commit b852c985010a77c850b7548d64bbb964ca462b02 upstream.

HW ACR support may have issues on some older chips, so
use SW ACR for now until we've tested further.

Signed-off-by: Alex Deucher <alexander.deucher@....com>
CC: Rafał Miłecki <zajec5@...il.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/gpu/drm/radeon/r600_hdmi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c
index ffd02da..4140fe8 100644
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -345,6 +345,7 @@ void r600_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode *mod
 	}
 
 	WREG32(HDMI0_ACR_PACKET_CONTROL + offset,
+	       HDMI0_ACR_SOURCE | /* select SW CTS value - XXX verify that hw CTS works on all families */
 	       HDMI0_ACR_AUTO_SEND); /* allow hw to sent ACR packets when required */
 
 	WREG32(HDMI0_VBI_PACKET_CONTROL + offset,
-- 
1.8.3.2

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