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From c57372d1bf1128cd5d5c6371bdc53470ff00d10d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Fri, 23 Dec 2011 20:32:18 +0100
Subject: [PATCH 017/130] drm/radeon/kms: workaround invalid AVI infoframe
checksum issue
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
commit 92db7f6c860b8190571a9dc1fcbc16d003422fe8 upstream.
This change was verified to fix both issues with no video I've
investigated. I've also checked checksum calculation with fglrx on:
RV620, HD54xx, HD5450, HD6310, HD6320.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/gpu/drm/radeon/r600_hdmi.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c
index f5ac7e7..c45d921 100644
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -196,6 +196,13 @@ static void r600_hdmi_videoinfoframe(
frame[0xD] = (right_bar >> 8);
r600_hdmi_infoframe_checksum(0x82, 0x02, 0x0D, frame);
+ /* Our header values (type, version, length) should be alright, Intel
+ * is using the same. Checksum function also seems to be OK, it works
+ * fine for audio infoframe. However calculated value is always lower
+ * by 2 in comparison to fglrx. It breaks displaying anything in case
+ * of TVs that strictly check the checksum. Hack it manually here to
+ * workaround this issue. */
+ frame[0x0] += 2;
WREG32(offset+R600_HDMI_VIDEOINFOFRAME_0,
frame[0x0] | (frame[0x1] << 8) | (frame[0x2] << 16) | (frame[0x3] << 24));
--
1.7.9.4
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