diff options
| author | Rafał Miłecki <zajec5@gmail.com> | 2011-12-23 20:32:18 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-01-03 10:40:10 +0100 |
| commit | 92db7f6c860b8190571a9dc1fcbc16d003422fe8 (patch) | |
| tree | 8576bf61619850ba81eee0e0b1d020e7836c6ca5 /drivers/gpu/drm | |
| parent | drm/radeon/kms: setup HDMI mode on Evergreen encoders (diff) | |
| download | linux-92db7f6c860b8190571a9dc1fcbc16d003422fe8.tar.xz linux-92db7f6c860b8190571a9dc1fcbc16d003422fe8.zip | |
drm/radeon/kms: workaround invalid AVI infoframe checksum issue
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.
Cc: stable@vger.kernel.org
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/radeon/r600_hdmi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c index 5c805f7fea39..2c70a85e72c6 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)); |