Re: [PATCH v2 13/20] drm/i915: Always reset in intel_crtc_restore_mode

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

Op 07-07-15 om 12:17 schreef Daniel Vetter:
> On Tue, Jul 07, 2015 at 09:08:24AM +0200, Maarten Lankhorst wrote:
>> And get rid of things that are no longer true. This function is only
>> used for forcing a modeset when encoder properties are changed.
>>
>> All the existing state is fine in this case, only setting mode_changed
>> will force a full recalculation here, and take all the state needed.
>>
>> The previous commit will prevent unneeded modesets anyway.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>> ---
>>  drivers/gpu/drm/i915/intel_display.c | 58 ++++++++++--------------------------
>>  1 file changed, 16 insertions(+), 42 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index 16373309dcae..f7b1fc28142c 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -13260,63 +13260,37 @@ void intel_crtc_restore_mode(struct drm_crtc *crtc)
>>  {
>>  	struct drm_device *dev = crtc->dev;
>>  	struct drm_atomic_state *state;
>> -	struct intel_encoder *encoder;
>> -	struct intel_connector *connector;
>> -	struct drm_connector_state *connector_state;
>> -	struct intel_crtc_state *crtc_state;
>> +	struct drm_crtc_state *crtc_state;
>>  	int ret;
>>  
>>  	state = drm_atomic_state_alloc(dev);
>>  	if (!state) {
>> -		DRM_DEBUG_KMS("[CRTC:%d] mode restore failed, out of memory",
>> +		DRM_DEBUG_KMS("[CRTC:%d] crtc restore failed, out of memory",
>>  			      crtc->base.id);
>>  		return;
>>  	}
>>  
>> -	state->acquire_ctx = dev->mode_config.acquire_ctx;
>> -
>> -	/* The force restore path in the HW readout code relies on the staged
>> -	 * config still keeping the user requested config while the actual
>> -	 * state has been overwritten by the configuration read from HW. We
>> -	 * need to copy the staged config to the atomic state, otherwise the
>> -	 * mode set will just reapply the state the HW is already in. */
>> -	for_each_intel_encoder(dev, encoder) {
>> -		if (encoder->base.crtc != crtc)
>> -			continue;
>> +	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
>>  
>> -		for_each_intel_connector(dev, connector) {
>> -			if (connector->base.state->best_encoder !=
>> -			    &encoder->base)
>> -				continue;
>> -
>> -			connector_state = drm_atomic_get_connector_state(state, &connector->base);
>> -			if (IS_ERR(connector_state)) {
>> -				DRM_DEBUG_KMS("Failed to add [CONNECTOR:%d:%s] to state: %ld\n",
>> -					      connector->base.base.id,
>> -					      connector->base.name,
>> -					      PTR_ERR(connector_state));
>> -				continue;
>> -			}
>> +retry:
>> +	crtc_state = drm_atomic_get_crtc_state(state, crtc);
>> +	ret = PTR_ERR_OR_ZERO(crtc_state);
>> +	if (!ret) {
>> +		if (!crtc_state->active)
>> +			goto out;
>>  
>> -			connector_state->crtc = crtc;
>> -		}
>> +		crtc_state->mode_changed = true;
>> +		ret = intel_set_mode(state);
> I think here (instead of the hw state readout/restore code) we must do a
> full compute config of the pipe state - most of the connector properties
> need that to get reflected. Should be easy to test by changing the panel
> upscaling property. Hence I think we should be able to run a full-blown
> drm_atomic_commit here.
Which is what this code does?
Together with the previous commit at least, without it it just performs a full modeset and recalculation.
>>  	}
>>  
>> -	crtc_state = intel_atomic_get_crtc_state(state, to_intel_crtc(crtc));
>> -	if (IS_ERR(crtc_state)) {
>> -		DRM_DEBUG_KMS("Failed to add [CRTC:%d] to state: %ld\n",
>> -			      crtc->base.id, PTR_ERR(crtc_state));
>> -		drm_atomic_state_free(state);
>> -		return;
>> +	if (ret == -EDEADLK) {
>> +		drm_atomic_state_clear(state);
>> +		drm_modeset_backoff(state->acquire_ctx);
>> +		goto retry;
>>  	}
>>  
>> -	drm_mode_copy(&crtc_state->base.mode, &crtc->mode);
>> -
>> -	intel_modeset_setup_plane_state(state, crtc, &crtc->mode,
>> -					crtc->primary->fb, crtc->x, crtc->y);
>> -
>> -	ret = intel_set_mode(state);
>>  	if (ret)
>> +out:
>>  		drm_atomic_state_free(state);
>>  }
>>  
>> -- 
>> 2.1.0
>>
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