[Intel-gfx] [PATCH v3 6/7] drm/atomic: Convert get_existing_state callers to get_old/new_state, v2.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Thu Feb 16 14:34:01 UTC 2017
Op 17-01-17 om 02:27 schreef Laurent Pinchart:
> Hi Maarten,
>
> One more thing.
>
> On Monday 16 Jan 2017 10:37:43 Maarten Lankhorst wrote:
>> This is a straightforward conversion that converts all the users of
>> get_existing_state in atomic core to use get_old_state or get_new_state
>>
>> Changes since v1:
>> - Fix using the wrong state in
>> drm_atomic_helper_update_legacy_modeset_state.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>> ---
>> drivers/gpu/drm/drm_atomic.c | 6 +++---
>> drivers/gpu/drm/drm_atomic_helper.c | 39 ++++++++++++++--------------------
>> drivers/gpu/drm/drm_blend.c | 3 +--
>> 3 files changed, 22 insertions(+), 26 deletions(-)
> [snip]
>
>> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
>> b/drivers/gpu/drm/drm_atomic_helper.c index b26cf786ce12..1de8d5fbc8d3
>> 100644
>> --- a/drivers/gpu/drm/drm_atomic_helper.c
>> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> [snip]
>
>> @@ -698,8 +695,7 @@ disable_outputs(struct drm_device *dev, struct
>> drm_atomic_state *old_state) if (!old_conn_state->crtc)
>> continue;
>>
>> - old_crtc_state = drm_atomic_get_existing_crtc_state(old_state,
>> -
> old_conn_state->crtc);
>> + old_crtc_state = drm_atomic_get_new_crtc_state(old_state,
>> old_conn_state->crtc);
> This looks wrong. I believe you should call drm_atomic_get_old_crtc_state()
> here. If I'm not mistaken drm_atomic_get_existing_crtc_state() did the right
> thing as old_state->crtcs[*].state was set to the old state by the state swap
> operation.
This is wrong, even. Fixed in next version. At least looking at the code made it obvious. :)
> On the other hand, drm_atomic_helper_update_legacy_modeset_state() uses
> drm_atomic_get_new_plane_state() the same way you do here, even though it
> operates after state swap, and your changelog specifically mentions that
> you've fixed that in v2. It's getting too late to properly wrap my head around
> this, I'll let you check which option is correct (but I reserve the right to
> challenge it if your explanation isn't convincing enough ;-)).
update_legacy_modeset_state was looking at primary->state (new state) before,
but was using get_existing_state to check whether it's part of the commit, so it's
valid to look at plane->state.
This was fixed to get the new state, so it makes sense there.
>> if (!old_crtc_state->active ||
>> !drm_atomic_crtc_needs_modeset(old_conn_state->crtc-
>> state))
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