On 2019-10-01 5:43 p.m., Gustavo A. R. Silva wrote:
> Hi,
>
> On 10/1/19 16:29, Liu, Leo wrote:
>> On 2019-10-01 1:16 p.m., Gustavo A. R. Silva wrote:
>>> Notice that there is a *continue* statement in the middle of the
>>> for loop and that prevents the code below from ever being reached:
>>>
>>> r = amdgpu_ring_test_ring(ring);
>>> if (r) {
>>> ring->sched.ready = false;
>>> goto done;
>>> }
>>>
>>> Fix this by removing the continue statement and updating ring->sched.ready
>>> to true before calling amdgpu_ring_test_ring(ring).
>>>
>>> Notice that this fix is based on
>>> commit 1b61de45dfaf ("drm/amdgpu: add initial VCN2.0 support (v2)")
>>>
>>> Addresses-Coverity-ID 1485608 ("Structurally dead code")
>>> Fixes: 28c17d72072b ("drm/amdgpu: add VCN2.5 basic supports")
>>> Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
>>> ---
>>>
>>> Any feedback is greatly appreciated.
>>>
>>> drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c | 5 +++--
>>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c b/drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c
>>> index 395c2259f979..47b0dcd59e13 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c
>>> @@ -258,6 +258,7 @@ static int vcn_v2_5_hw_init(void *handle)
>>> adev->nbio_funcs->vcn_doorbell_range(adev, ring->use_doorbell,
>>> ring->doorbell_index, j);
>>>
>>> + ring->sched.ready = true;
>> This is redundant. all the sched->ready is initialized as true, please
>> refer to drm_sched_init()
>>
> I see... so in the following commit 1b61de45dfaf ("drm/amdgpu: add initial VCN2.0 support (v2)")
> that line is also redundant?
Yes.
>>> r = amdgpu_ring_test_ring(ring);
>>> if (r) {
>>> ring->sched.ready = false;
>>> @@ -266,8 +267,7 @@ static int vcn_v2_5_hw_init(void *handle)
>>>
>>> for (i = 0; i < adev->vcn.num_enc_rings; ++i) {
>>> ring = &adev->vcn.inst[j].ring_enc[i];
>>> - ring->sched.ready = false;
>>> - continue;
>>> + ring->sched.ready = true;
>> Because the VCN 2.5 FW still has issue for encode, so we have it
>> disabled here.
>>
> OK. So, maybe we can add a comment pointing that out?
That could be better.
Thanks,
Leo
>
> Thanks
> --
> Gustavo
>
>>> r = amdgpu_ring_test_ring(ring);
>>> if (r) {
>>> ring->sched.ready = false;
>>> @@ -276,6 +276,7 @@ static int vcn_v2_5_hw_init(void *handle)
>>> }
>>>
>>> ring = &adev->vcn.inst[j].ring_jpeg;
>>> + ring->sched.ready = true;
>>> r = amdgpu_ring_test_ring(ring);
>>> if (r) {
>>> ring->sched.ready = false;
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