Re: [PATCH 1/6] drm/i915: Use atomic state to obtain load detection crtc.

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Op 01-02-16 om 17:08 schreef Ville Syrjälä:
> On Mon, Feb 01, 2016 at 02:43:57PM +0100, Maarten Lankhorst wrote:
>> Instead of restoring dpms and a flag for whether a temp fb is allocated duplicate
>> the old plane_state and crtc_state, and restore the members we potentially touched.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
>> ---
>>  drivers/gpu/drm/i915/intel_display.c | 128 ++++++++++++++++++++---------------
>>  drivers/gpu/drm/i915/intel_drv.h     |   4 +-
>>  2 files changed, 76 insertions(+), 56 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index 4d8c9f7857db..0702ce8ec36a 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -10361,6 +10361,7 @@ mode_fits_in_fbdev(struct drm_device *dev,
>>  	if (obj->base.size < mode->vdisplay * fb->pitches[0])
>>  		return NULL;
>>  
>> +	drm_framebuffer_reference(fb);
>>  	return fb;
>>  #else
>>  	return NULL;
>> @@ -10426,6 +10427,9 @@ bool intel_get_load_detect_pipe(struct drm_connector *connector,
>>  		      encoder->base.id, encoder->name);
>>  
>>  retry:
>> +	old->old_pipe_config = NULL;
>> +	old->old_plane_state = NULL;
>> +
>>  	ret = drm_modeset_lock(&config->connection_mutex, ctx);
>>  	if (ret)
>>  		goto fail;
>> @@ -10441,24 +10445,15 @@ retry:
>>  	 */
>>  
>>  	/* See if we already have a CRTC for this connector */
>> -	if (encoder->crtc) {
>> -		crtc = encoder->crtc;
>> +	if (connector->state->crtc) {
>> +		crtc = connector->state->crtc;
>>  
>>  		ret = drm_modeset_lock(&crtc->mutex, ctx);
>>  		if (ret)
>>  			goto fail;
>> -		ret = drm_modeset_lock(&crtc->primary->mutex, ctx);
>> -		if (ret)
>> -			goto fail;
>> -
>> -		old->dpms_mode = connector->dpms;
>> -		old->load_detect_temp = false;
>>  
>>  		/* Make sure the crtc and connector are running */
>> -		if (connector->dpms != DRM_MODE_DPMS_ON)
>> -			connector->funcs->dpms(connector, DRM_MODE_DPMS_ON);
>> -
>> -		return true;
>> +		goto found;
>>  	}
>>  
>>  	/* Find an unused one (if possible) */
>> @@ -10466,8 +10461,15 @@ retry:
>>  		i++;
>>  		if (!(encoder->possible_crtcs & (1 << i)))
>>  			continue;
>> -		if (possible_crtc->state->enable)
>> +
>> +		ret = drm_modeset_lock(&possible_crtc->mutex, ctx);
>> +		if (ret)
>> +			goto fail;
>> +
>> +		if (possible_crtc->state->enable) {
>> +			drm_modeset_unlock(&possible_crtc->mutex);
>>  			continue;
>> +		}
>>  
>>  		crtc = possible_crtc;
>>  		break;
>> @@ -10481,17 +10483,19 @@ retry:
>>  		goto fail;
>>  	}
>>  
>> -	ret = drm_modeset_lock(&crtc->mutex, ctx);
>> -	if (ret)
>> -		goto fail;
>> +found:
>> +	intel_crtc = to_intel_crtc(crtc);
>> +
>>  	ret = drm_modeset_lock(&crtc->primary->mutex, ctx);
>>  	if (ret)
>>  		goto fail;
>>  
>> -	intel_crtc = to_intel_crtc(crtc);
>> -	old->dpms_mode = connector->dpms;
>> -	old->load_detect_temp = true;
>> -	old->release_fb = NULL;
>> +	old->old_pipe_config = intel_crtc_duplicate_state(crtc);
>> +	old->old_plane_state = intel_plane_duplicate_state(crtc->primary);
>> +	if (!old->old_pipe_config || !old->old_plane_state) {
>> +		ret = -ENOMEM;
>> +		goto fail;
>> +	}
>>  
>>  	state = drm_atomic_state_alloc(dev);
>>  	if (!state)
>> @@ -10505,7 +10509,9 @@ retry:
>>  		goto fail;
>>  	}
>>  
>> -	connector_state->crtc = crtc;
>> +	ret = drm_atomic_set_crtc_for_connector(connector_state, crtc);
>> +	if (ret)
>> +		goto fail;
>>  
>>  	crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
>>  	if (IS_ERR(crtc_state)) {
>> @@ -10529,7 +10535,6 @@ retry:
>>  	if (fb == NULL) {
>>  		DRM_DEBUG_KMS("creating tmp fb for load-detection\n");
>>  		fb = intel_framebuffer_create_for_mode(dev, mode, 24, 32);
>> -		old->release_fb = fb;
>>  	} else
>>  		DRM_DEBUG_KMS("reusing fbdev for load-detection framebuffer\n");
>>  	if (IS_ERR(fb)) {
>> @@ -10541,15 +10546,16 @@ retry:
>>  	if (ret)
>>  		goto fail;
>>  
>> -	drm_mode_copy(&crtc_state->base.mode, mode);
>> +	drm_framebuffer_unreference(fb);
>> +
>> +	ret = drm_atomic_set_mode_for_crtc(&crtc_state->base, mode);
>> +	if (ret)
>> +		goto fail;
>>  
>>  	if (drm_atomic_commit(state)) {
>>  		DRM_DEBUG_KMS("failed to set mode on load-detect pipe\n");
>> -		if (old->release_fb)
>> -			old->release_fb->funcs->destroy(old->release_fb);
>>  		goto fail;
>>  	}
>> -	crtc->primary->crtc = crtc;
>>  
>>  	/* let the connector get through one full cycle before testing */
>>  	intel_wait_for_vblank(dev, intel_crtc->pipe);
>> @@ -10559,6 +10565,12 @@ fail:
>>  	drm_atomic_state_free(state);
>>  	state = NULL;
>>  
>> +	if (old->old_pipe_config)
>> +		intel_crtc_destroy_state(crtc, old->old_pipe_config);
>> +
>> +	if (old->old_plane_state)
>> +		intel_plane_destroy_state(crtc->primary, old->old_plane_state);
>> +
>>  	if (ret == -EDEADLK) {
>>  		drm_modeset_backoff(ctx);
>>  		goto retry;
>> @@ -10575,61 +10587,69 @@ void intel_release_load_detect_pipe(struct drm_connector *connector,
>>  	struct intel_encoder *intel_encoder =
>>  		intel_attached_encoder(connector);
>>  	struct drm_encoder *encoder = &intel_encoder->base;
>> -	struct drm_crtc *crtc = encoder->crtc;
>> +	struct drm_crtc *crtc = connector->state->crtc;
>>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>>  	struct drm_atomic_state *state;
>>  	struct drm_connector_state *connector_state;
>>  	struct intel_crtc_state *crtc_state;
>> +	struct drm_plane_state *plane_state;
>>  	int ret;
>>  
>>  	DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
>>  		      connector->base.id, connector->name,
>>  		      encoder->base.id, encoder->name);
>>  
>> -	if (old->load_detect_temp) {
>> -		state = drm_atomic_state_alloc(dev);
>> -		if (!state)
>> -			goto fail;
>> +	if (!old->old_pipe_config)
>> +		return;
>>  
>> -		state->acquire_ctx = ctx;
>> +	state = drm_atomic_state_alloc(dev);
>> +	if (!state)
>> +		goto fail;
>>  
>> -		connector_state = drm_atomic_get_connector_state(state, connector);
>> -		if (IS_ERR(connector_state))
>> -			goto fail;
>> +	state->acquire_ctx = ctx;
>>  
>> -		crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
>> -		if (IS_ERR(crtc_state))
>> -			goto fail;
>> +	connector_state = drm_atomic_get_connector_state(state, connector);
>> +	if (IS_ERR(connector_state))
>> +		goto fail;
>>  
>> -		connector_state->crtc = NULL;
>> +	crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
>> +	if (IS_ERR(crtc_state))
>> +		goto fail;
>>  
>> -		crtc_state->base.enable = crtc_state->base.active = false;
>> +	plane_state = drm_atomic_get_plane_state(state, crtc->primary);
>> +	if (IS_ERR(plane_state))
>> +		goto fail;
>>  
>> -		ret = intel_modeset_setup_plane_state(state, crtc, NULL, NULL,
>> -						      0, 0);
>> +	if (!old->old_pipe_config->enable) {
>> +		ret = drm_atomic_set_crtc_for_connector(connector_state, NULL);
>>  		if (ret)
>>  			goto fail;
>> +	}
>>  
>> -		ret = drm_atomic_commit(state);
>> -		if (ret)
>> -			goto fail;
>> +	crtc_state->base.enable = old->old_pipe_config->enable;
>> +	crtc_state->base.active = old->old_pipe_config->active;
>>  
>> -		if (old->release_fb) {
>> -			drm_framebuffer_unregister_private(old->release_fb);
>> -			drm_framebuffer_unreference(old->release_fb);
>> -		}
>> +	drm_atomic_set_fb_for_plane(plane_state, old->old_plane_state->fb);
>> +	ret = drm_atomic_set_crtc_for_plane(plane_state, old->old_plane_state->crtc);
>> +	if (ret)
>> +		goto fail;
>>  
>> -		return;
>> -	}
>> +	old->old_plane_state->state = plane_state->state;
>> +	*plane_state = *old->old_plane_state;
> This part looks messy. I don't think there's any reason anyone
> interested in load detection should need to do these sort of
> gymnastics manually. So there really should be some kind of nice
> thing to just tell atomic that:
> "i have this old plane/crtc/connector/etc. state here, please
> just restore it"
We could create 2 atomic states, update the first one, and commit the second one in release_load_detect_pipe.

~Maarten
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