Op 03-06-15 om 03:52 schreef Konduru, Chandra:
>
>> -----Original Message-----
>> From: Roper, Matthew D
>> Sent: Tuesday, June 02, 2015 6:30 PM
>> To: Maarten Lankhorst
>> Cc: intel-gfx@lists.freedesktop.org; Konduru, Chandra
>> Subject: Re: [Intel-gfx] [PATCH 08/24] drm/i915: Do not add planes from
>> intel_atomic_setup_scalers.
>>
>> On Mon, Jun 01, 2015 at 03:27:11PM +0200, Maarten Lankhorst wrote:
>>> This may postpone going to HQ mode until the plane is in the
>>> drm_atomic_state if it's not using scaler 0, but it does allow moving
>>> intel_atomic_setup_scalers to the crtc check function.
>>>
>>> Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
>>> ---
>>> drivers/gpu/drm/i915/intel_atomic.c | 41
>>> ++++++++++++++++++----------------
>> --
>>> drivers/gpu/drm/i915/intel_display.c | 27 +++++++++++++++---------
>>> drivers/gpu/drm/i915/intel_drv.h | 2 ++
>>> 3 files changed, 39 insertions(+), 31 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/intel_atomic.c
>> b/drivers/gpu/drm/i915/intel_atomic.c
>>> index 1edd1651c045..a8202fa0daa8 100644
>>> --- a/drivers/gpu/drm/i915/intel_atomic.c
>>> +++ b/drivers/gpu/drm/i915/intel_atomic.c
>>> @@ -100,14 +100,6 @@ int intel_atomic_check(struct drm_device *dev,
>>> if (ret)
>>> return ret;
>>>
>>> - /*
>>> - * FIXME: move to crtc atomic check function once this is
>>> - * more atomic friendly.
>>> - */
>>> - ret = intel_atomic_setup_scalers(dev, nuclear_crtc, crtc_state);
>>> - if (ret)
>>> - return ret;
>>> -
>>> return ret;
>>> }
>>>
>>> @@ -336,21 +328,10 @@ int intel_atomic_setup_scalers(struct drm_device
>> *dev,
>>> /* find the plane that set the bit as scaler_user */
>>> plane = drm_state->planes[i];
>>>
>>> - /*
>>> - * to enable/disable hq mode, add planes that are using
>> scaler
>>> - * into this transaction
>>> - */
>>> if (!plane) {
>>> - struct drm_plane_state *state;
>>> - plane = drm_plane_from_index(dev, i);
>>> - state =
>> drm_atomic_get_plane_state(drm_state, plane);
>>> - if (IS_ERR(state)) {
>>> - DRM_DEBUG_KMS("Failed to add
>> [PLANE:%d] to drm_state\n",
>>> - plane->base.id);
>>> - return PTR_ERR(state);
>>> - }
>>> + DRM_DEBUG_KMS("Failed to find [PLANE:%d]
>> in drm_state\n", plane->base.id);
>>> + continue;
>>> }
>>> -
>>> intel_plane = to_intel_plane(plane);
>>>
>>> /* plane on different crtc cannot be a scaler user of
>>> this
>> crtc */
>>> @@ -396,6 +377,24 @@ int intel_atomic_setup_scalers(struct drm_device
>> *dev,
>>> }
>>> }
>>>
>>> + /* plane not part of mask must leave hq mode? */
>>> + if (num_scalers_need > 1 && scaler_state->scalers[0].in_use &&
>>> + scaler_state->scalers[0].mode == PS_SCALER_MODE_HQ) {
>>> + scaler_state->scalers[0].mode = PS_SCALER_MODE_DYN;
>>> +
>>> + intel_crtc->atomic.skl_update_scaler0 =
>>> + PS_SCALER_EN | PS_SCALER_MODE_DYN;
>>> + }
>>> +
>>> + /* plane not part of mask can enter hq mode? */
>>> + if (num_scalers_need == 1 && scaler_state->scalers[0].in_use &&
>>> + intel_crtc->pipe != PIPE_C && scaler_state->scalers[0].mode !=
>> PS_SCALER_MODE_HQ) {
>>> + scaler_state->scalers[0].mode = PS_SCALER_MODE_HQ;
>>> +
>>> + intel_crtc->atomic.skl_update_scaler0 =
>>> + PS_SCALER_EN | PS_SCALER_MODE_HQ;
>>> + }
>>> +
>> I don't have access to the hw spec at the moment; is scaler #0 the only
>> one that can ever go into HQ mode?
> Yes
>
>> If there isn't a hardware
>> requirement about this, then it seems like we're missing the case where
>> planes A and B get scalers 0 and 1. Then plane A (and thus scaler 0) is
>> disabled, which should allow scaler 1 to go into HQ mode.
> In this case, scaler 0 to be allocated to plane B to operate in HQ mode.
Is it really bad to keep it on scaler 1 for a while until the next time the
plane is added?
>> I guess it's not immediately clear to me why we need to not pull the
>> other planes into the transaction. Is this just to avoid doing some
>> extra work for a plane that hasn't changed, or does it cause a problem
>> somehow?
> Per atomic design, unchanged planes can be added to transaction.
> And scaler implementation is using this design feature.
> Not sure what the issue here, but we need this feature continue
> to available.
>
Unchanged planes can be added, but this could pull in a primary plane, which
would need
to set atomic.wait_for_flips then. I can do that as special case when adding a
plane if
that's preferred.
~Maarten
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