Am 28.04.2014 16:41, schrieb Alex Deucher:
> On Mon, Apr 28, 2014 at 4:17 AM, Christian K?nig
> <deathsimple at vodafone.de> wrote:
>> From: Christian K?nig <christian.koenig at amd.com>
>>
>> Some RV7xx generation hardware crashes after you
>> raise the UVD clocks for the first time. Try to
>> avoid this by using the lower clocks to boot these.
>>
>> Workaround for: https://bugzilla.kernel.org/show_bug.cgi?id=71891
>>
>> v2: lower clocks on IB test as well
>>
>> Signed-off-by: Christian K?nig <christian.koenig at amd.com>
>> Cc: stable at vger.kernel.org
> Any reason not to just always use lower clocks for the tests for all
> asics?
Yeah, evergreen and BTC don't want to boot UVD with the lower clocks, no
idea why.
But essentially it's just a workaround, we should really try to figure
out why this RV730 crashes so badly as soon as you raise the UVD clocks.
> Either way:
>
> Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Thanks,
Christian.
>
>> ---
>> drivers/gpu/drm/radeon/uvd_v1_0.c | 10 ++++++++--
>> 1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/radeon/uvd_v1_0.c
>> b/drivers/gpu/drm/radeon/uvd_v1_0.c
>> index 0a243f0..be42c81 100644
>> --- a/drivers/gpu/drm/radeon/uvd_v1_0.c
>> +++ b/drivers/gpu/drm/radeon/uvd_v1_0.c
>> @@ -83,7 +83,10 @@ int uvd_v1_0_init(struct radeon_device *rdev)
>> int r;
>>
>> /* raise clocks while booting up the VCPU */
>> - radeon_set_uvd_clocks(rdev, 53300, 40000);
>> + if (rdev->family < CHIP_RV740)
>> + radeon_set_uvd_clocks(rdev, 10000, 10000);
>> + else
>> + radeon_set_uvd_clocks(rdev, 53300, 40000);
>>
>> r = uvd_v1_0_start(rdev);
>> if (r)
>> @@ -407,7 +410,10 @@ int uvd_v1_0_ib_test(struct radeon_device *rdev, struct
>> radeon_ring *ring)
>> struct radeon_fence *fence = NULL;
>> int r;
>>
>> - r = radeon_set_uvd_clocks(rdev, 53300, 40000);
>> + if (rdev->family < CHIP_RV740)
>> + r = radeon_set_uvd_clocks(rdev, 10000, 10000);
>> + else
>> + r = radeon_set_uvd_clocks(rdev, 53300, 40000);
>> if (r) {
>> DRM_ERROR("radeon: failed to raise UVD clocks (%d).\n", r);
>> return r;
>> --
>> 1.9.1
>>
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