Re: [PATCH] amdgpu/dc: Use DRM new-style object iterators.

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Op 11-10-17 om 20:55 schreef Leo:
>
>
> On 2017-10-11 10:30 AM, Maarten Lankhorst wrote:
>> Op 11-10-17 om 16:24 schreef sunpeng.li@amd.com:
>>> From: "Leo (Sunpeng) Li" <sunpeng.li@amd.com>
>>>
>>> Use the correct for_each_new/old_* iterators instead of for_each_*
>>>
>>> List of affected functions:
>>>
>>> amdgpu_dm_find_first_crtc_matching_connector: use for_each_new
>>>      - Old from_state_var flag was always choosing the new state
>>>
>>> amdgpu_dm_display_resume: use for_each_new
>>>      - drm_atomic_helper_duplicate_state is called during suspend to
>>>        cache the state
>>>      - It sets 'state' within the state triplet to 'new_state'
>>>
>>> amdgpu_dm_commit_planes: use for_each_old
>>>      - Called after the state was swapped (via atomic commit tail)
>>>
>>> amdgpu_dm_atomic_commit: use for_each_new
>>>      - Called before the state is swapped
>>>
>>> amdgpu_dm_atomic_commit_tail: use for_each_old
>>>      - Called after the state was swapped
>>>
>>> dm_update_crtcs_state: use for_each_new
>>>      - Called before the state is swapped (via atomic check)
>>>
>>> amdgpu_dm_atomic_check: use for_each_new
>>>      - Called before the state is swapped
>>>
>>> Also fix some typos.
>>>
>>> crct -> crtc
>>> undersacn -> underscan
>>>
>>> Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@amd.com>
>>> ---
>>>
>>> Hi Dave,
>>>
>>> This patch goes on top of your fixup for new api's patch. Please feel
>>> free to squash them.
>>>
>>> Thanks,
>>> Leo
>>>
>>>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 38 +++++++++--------------
>>>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  5 ++-
>>>   2 files changed, 16 insertions(+), 27 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> index 9bfe1f9..9394558 100644
>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> @@ -568,25 +568,17 @@ static int dm_suspend(void *handle)
>>>       return ret;
>>>   }
>>>   -struct amdgpu_dm_connector *amdgpu_dm_find_first_crct_matching_connector(
>>> +struct amdgpu_dm_connector *amdgpu_dm_find_first_crtc_matching_connector(
>>>       struct drm_atomic_state *state,
>>> -    struct drm_crtc *crtc,
>>> -    bool from_state_var)
>>> +    struct drm_crtc *crtc)
>>>   {
>>>       uint32_t i;
>>>       struct drm_connector_state *conn_state;
>>>       struct drm_connector *connector;
>>>       struct drm_crtc *crtc_from_state;
>>>   -    for_each_new_connector_in_state(
>>> -        state,
>>> -        connector,
>>> -        conn_state,
>>> -        i) {
>>> -        crtc_from_state =
>>> -            from_state_var ?
>>> -                conn_state->crtc :
>>> -                connector->state->crtc;
>>> +    for_each_new_connector_in_state(state, connector, conn_state, i) {
>>> +        crtc_from_state = conn_state->crtc;
>> Please assign crtc_from_state here with drm_atomic_get_(new/old)_crtc_state.
>
> We're trying to fetch a drm_crtc from a drm_connector_state, I don't think the state getters are applicable here.
>
> Also, the function should really be named 'find_first_connector_matching_crtc'. I'll fix that.
Oh I misunderstood. But in general derefencing $obj->state should be frowned upon. If you ever want to support atomic flip depth > 1,
all those references should be gone from your driver, and replaced with get_old/new_state..
>>
>>
>>>           if (crtc_from_state == crtc)
>>>               return to_amdgpu_dm_connector(connector);
>>> @@ -3890,7 +3882,7 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
>>>       unsigned long flags;
>>>         /* update planes when needed */
>>> -    for_each_new_plane_in_state(state, plane, old_plane_state, i) {
>>> +    for_each_old_plane_in_state(state, plane, old_plane_state, i) {
>>>           struct drm_plane_state *plane_state = plane->state;
>>>           struct drm_crtc *crtc = plane_state->crtc;
>>>           struct drm_framebuffer *fb = plane_state->fb;
>> Use for_each_oldnew_*_in_state
>>> @@ -4024,7 +4016,7 @@ void amdgpu_dm_atomic_commit_tail(
>>>       dm_state = to_dm_atomic_state(state);
>>>         /* update changed items */
>>> -    for_each_new_crtc_in_state(state, crtc, old_crtc_state, i) {
>>> +    for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
>>>           struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
>>>           struct drm_crtc_state *new_state = crtc->state;
>> Same.
>
> Good points, it seems like there's quite a few places where drm interfaces can be used. Thanks for pointing this out.
>
> Leo
>
>>>   @@ -4113,11 +4105,9 @@ void amdgpu_dm_atomic_commit_tail(
>>>               new_acrtc_state = to_dm_crtc_state(new_crtcs[i]->base.state);
>>>                 new_stream = new_acrtc_state->stream;
>>> -            aconnector =
>>> -                amdgpu_dm_find_first_crct_matching_connector(
>>> +            aconnector = amdgpu_dm_find_first_crtc_matching_connector(
>>>                       state,
>>> -                    &new_crtcs[i]->base,
>>> -                    false);
>>> +                    &new_crtcs[i]->base);
>>>               if (!aconnector) {
>>>                   DRM_DEBUG_DRIVER("Atomic commit: Failed to find connector for acrtc id:%d "
>>>                        "skipping freesync init\n",
>>> @@ -4150,8 +4140,8 @@ void amdgpu_dm_atomic_commit_tail(
>>>           }
>>>       }
>>>   -    /* Handle scaling and undersacn changes*/
>>> -    for_each_new_connector_in_state(state, connector, old_conn_state, i) {
>>> +    /* Handle scaling and underscan changes*/
>>> +    for_each_old_connector_in_state(state, connector, old_conn_state, i) {
>>>           struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
>>>           struct dm_connector_state *con_new_state =
>>>                   to_dm_connector_state(aconnector->base.state);
>> Same here..
>
>>> @@ -4205,7 +4195,7 @@ void amdgpu_dm_atomic_commit_tail(
>>>       }
>>>         /* update planes when needed per crtc*/
>>> -    for_each_new_crtc_in_state(state, pcrtc, old_crtc_state, j) {
>>> +    for_each_old_crtc_in_state(state, pcrtc, old_crtc_state, j) {
>>>           new_acrtc_state = to_dm_crtc_state(pcrtc->state);
>> Same.
>
>>>           if (new_acrtc_state->stream)
>>> @@ -4218,7 +4208,7 @@ void amdgpu_dm_atomic_commit_tail(
>>>        * mark consumed event for drm_atomic_helper_commit_hw_done
>>>        */
>>>       spin_lock_irqsave(&adev->ddev->event_lock, flags);
>>> -    for_each_new_crtc_in_state(state, crtc, old_crtc_state, i) {
>>> +    for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
>>>           struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
>>>             if (acrtc->base.state->event)
>> Same. You're dereferencing crtc->state
>
>>> @@ -4402,7 +4392,7 @@ static int dm_update_crtcs_state(
>>>           new_acrtc_state = to_dm_crtc_state(crtc_state);
>>>           acrtc = to_amdgpu_crtc(crtc);
>>>   -        aconnector = amdgpu_dm_find_first_crct_matching_connector(state, crtc, true);
>>> +        aconnector = amdgpu_dm_find_first_crtc_matching_connector(state, crtc);
>>>             /* TODO This hack should go away */
>>>           if (aconnector) {
>>> @@ -4715,7 +4705,7 @@ int amdgpu_dm_atomic_check(struct drm_device *dev,
>>>        if (ret)
>>>            goto fail;
>>>   -    /* Check scaling and undersacn changes*/
>>> +    /* Check scaling and underscan changes*/
>>>       /*TODO Removed scaling changes validation due to inability to commit
>>>        * new stream into context w\o causing full reset. Need to
>>>        * decide how to handle.
>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>>> index 630e6cd..c1b77bd 100644
>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>>> @@ -226,10 +226,9 @@ extern const struct amdgpu_ip_block_version dm_ip_block;
>>>   void amdgpu_dm_update_connector_after_detect(
>>>       struct amdgpu_dm_connector *aconnector);
>>>   -struct amdgpu_dm_connector *amdgpu_dm_find_first_crct_matching_connector(
>>> +struct amdgpu_dm_connector *amdgpu_dm_find_first_crtc_matching_connector(
>>>       struct drm_atomic_state *state,
>>> -    struct drm_crtc *crtc,
>>> -    bool from_state_var);
>>> +    struct drm_crtc *crtc);
>>>       struct amdgpu_framebuffer;
>>
>>

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