Re: [PATCH 06/10] drm/i915: Update legacy primary state outside the commit hook.

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

Op 14-09-15 om 15:13 schreef Daniel Vetter:
> On Mon, Sep 14, 2015 at 11:52:26AM +0200, Maarten Lankhorst wrote:
>> Op 10-09-15 om 17:41 schreef Daniel Vetter:
>>> On Thu, Sep 10, 2015 at 04:08:01PM +0200, Maarten Lankhorst wrote:
>>>> This should allow not running plane commit when the crtc is off.
>>>> While the atomic helpers update those, crtc->x/y is only updated
>>>> during modesets, and primary plane is updated after this function
>>>> returns.
>>>>
>>>> Unfortunately non-atomic watermarks and fbc still depend on this
>>>> state inside i915, so it has to be kept in sync.
>>>>
>>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>>>> ---
>>>>  drivers/gpu/drm/i915/intel_display.c | 15 ++++++++-------
>>>>  1 file changed, 8 insertions(+), 7 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>>>> index 87c5eba08454..b809ee2a8678 100644
>>>> --- a/drivers/gpu/drm/i915/intel_display.c
>>>> +++ b/drivers/gpu/drm/i915/intel_display.c
>>>> @@ -12198,6 +12198,14 @@ intel_modeset_update_crtc_state(struct drm_atomic_state *state)
>>>>  			crtc->hwmode = crtc->state->adjusted_mode;
>>>>  		else
>>>>  			crtc->hwmode.crtc_clock = 0;
>>>> +
>>>> +		if (drm_atomic_get_existing_plane_state(state, crtc->primary)) {
>>>> +			struct drm_plane_state *plane_state = crtc->primary->state;
>>>> +
>>>> +			crtc->primary->fb = plane_state->fb;
>>>> +			crtc->x = plane_state->src_x >> 16;
>>>> +			crtc->y = plane_state->src_y >> 16;
>>>> +		}
>>> drm_atomic_helper_update_legacy_modeset_state should do that for us, not?
>>> Atm we have an if (any_ms) check for it, but that seems to just be a bug
>>> really.
>> That function doesn't update primary->fb though. This is fixed up by the caller of drm_atomic_commit
>> after the call succeeds. We need it sooner because update_fbc unfortunately still looks at the legacy state.
>>
>> There are a few other users of the legacy state left in i915, but they should be more easy to convert than fbc.
> Hm, I tried looking really hard but didn't find anything that cared about
> plane->fb. Can you please point me at them?
>
Look for primary->fb. :-) Also crtc->y is used in __intel_fbc_update.

~Maarten
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