Re: [PATCH v2 06/14] drm/i915: Update watermark related members in the crtc_state, v2.

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Nov 09, 2015 at 05:10:40PM +0100, Maarten Lankhorst wrote:
> Op 09-11-15 om 15:48 schreef Ander Conselvan De Oliveira:
> > On Tue, 2015-11-03 at 08:31 +0100, Maarten Lankhorst wrote:
> >> This removes another couple of hacks from intel_crtc->atomic, and
> >> creates proper atomic state for it.
> > Perhaps you could be more verbose about the hacks being removed.
> Right!
> >> Changes since v1:
> >> - Rebase on top of wm changes.
> >>
> >> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> >> ---
> >>  drivers/gpu/drm/i915/intel_atomic.c  |  2 ++
> >>  drivers/gpu/drm/i915/intel_display.c | 41 +++++++++++++++++------------------
> >> -
> >>  drivers/gpu/drm/i915/intel_drv.h     |  6 +++---
> >>  3 files changed, 24 insertions(+), 25 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_atomic.c
> >> b/drivers/gpu/drm/i915/intel_atomic.c
> >> index c4eadbc928b7..3e390db9d22b 100644
> >> --- a/drivers/gpu/drm/i915/intel_atomic.c
> >> +++ b/drivers/gpu/drm/i915/intel_atomic.c
> >> @@ -95,6 +95,8 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
> >>  
> >>  	crtc_state->update_pipe = false;
> >>  	crtc_state->disable_lp_wm = false;
> >> +	crtc_state->visible_changed = false;
> >> +	crtc_state->wm_changed = false;
> >>  
> >>  	return &crtc_state->base;
> >>  }
> >> diff --git a/drivers/gpu/drm/i915/intel_display.c
> >> b/drivers/gpu/drm/i915/intel_display.c
> >> index 54e4f04bb427..356e3a9e1741 100644
> >> --- a/drivers/gpu/drm/i915/intel_display.c
> >> +++ b/drivers/gpu/drm/i915/intel_display.c
> >> @@ -4753,6 +4753,8 @@ intel_pre_disable_primary(struct drm_crtc *crtc)
> >>  static void intel_post_plane_update(struct intel_crtc *crtc)
> >>  {
> >>  	struct intel_crtc_atomic_commit *atomic = &crtc->atomic;
> >> +	struct intel_crtc_state *pipe_config =
> >> +		to_intel_crtc_state(crtc->base.state);
> >>  	struct drm_device *dev = crtc->base.dev;
> >>  	struct drm_i915_private *dev_priv = dev->dev_private;
> >>  
> >> @@ -4761,10 +4763,9 @@ static void intel_post_plane_update(struct intel_crtc
> >> *crtc)
> >>  
> >>  	intel_frontbuffer_flip(dev, atomic->fb_bits);
> >>  
> >> -	if (atomic->disable_cxsr)
> >> -		crtc->wm.cxsr_allowed = true;
> >> +	crtc->wm.cxsr_allowed = true;
> >>  
> >> -	if (crtc->atomic.update_wm_post)
> >> +	if (pipe_config->wm_changed)
> >>  		intel_update_watermarks(&crtc->base);
> >>  
> >>  	if (atomic->update_fbc)
> >> @@ -4781,6 +4782,8 @@ static void intel_pre_plane_update(struct intel_crtc
> >> *crtc)
> >>  	struct drm_device *dev = crtc->base.dev;
> >>  	struct drm_i915_private *dev_priv = dev->dev_private;
> >>  	struct intel_crtc_atomic_commit *atomic = &crtc->atomic;
> >> +	struct intel_crtc_state *pipe_config =
> >> +		to_intel_crtc_state(crtc->base.state);
> >>  
> >>  	if (atomic->disable_fbc)
> >>  		intel_fbc_disable_crtc(crtc);
> >> @@ -4791,10 +4794,13 @@ static void intel_pre_plane_update(struct intel_crtc
> >> *crtc)
> >>  	if (atomic->pre_disable_primary)
> >>  		intel_pre_disable_primary(&crtc->base);
> >>  
> >> -	if (atomic->disable_cxsr) {
> >> +	if (pipe_config->visible_changed) {
> >>  		crtc->wm.cxsr_allowed = false;
> >>  		intel_set_memory_cxsr(dev_priv, false);
> >>  	}
> >> +
> >> +	if (!needs_modeset(&pipe_config->base) && pipe_config->wm_changed)
> >> +		intel_update_watermarks(&crtc->base);
> >>  }
> >>  
> >>  static void intel_crtc_disable_planes(struct drm_crtc *crtc, unsigned
> >> plane_mask)
> >> @@ -11617,6 +11623,7 @@ static bool needs_scaling(struct intel_plane_state
> >> *state)
> >>  int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state,
> >>  				    struct drm_plane_state *plane_state)
> >>  {
> >> +	struct intel_crtc_state *pipe_config =
> >> to_intel_crtc_state(crtc_state);
> >>  	struct drm_crtc *crtc = crtc_state->crtc;
> >>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> >>  	struct drm_plane *plane = plane_state->plane;
> >> @@ -11663,25 +11670,18 @@ int intel_plane_atomic_calc_changes(struct
> >> drm_crtc_state *crtc_state,
> >>  			 plane->base.id, was_visible, visible,
> >>  			 turn_off, turn_on, mode_changed);
> >>  
> >> -	if (turn_on) {
> >> -		intel_crtc->atomic.update_wm_pre = true;
> >> -		/* must disable cxsr around plane enable/disable */
> >> -		if (plane->type != DRM_PLANE_TYPE_CURSOR) {
> >> -			intel_crtc->atomic.disable_cxsr = true;
> >> -			/* to potentially re-enable cxsr */
> >> -			intel_crtc->atomic.wait_vblank = true;
> >> -			intel_crtc->atomic.update_wm_post = true;
> >> -		}
> >> -	} else if (turn_off) {
> >> -		intel_crtc->atomic.update_wm_post = true;
> >> +	if (turn_on || turn_off) {
> >> +		pipe_config->wm_changed = true;
> >> +
> >>  		/* must disable cxsr around plane enable/disable */
> >>  		if (plane->type != DRM_PLANE_TYPE_CURSOR) {
> >> +			pipe_config->visible_changed = true;
> >>  			if (is_crtc_enabled)
> >>  				intel_crtc->atomic.wait_vblank = true;
> >> -			intel_crtc->atomic.disable_cxsr = true;
> >>  		}
> > I'm a bit confused as to what the value of visible_changed is supposed to be. In
> > the comment in intel_drv.h you wrote "plane visibility changed". But that isn't
> > set if the cursor plane visibility changed. If the value of this is only
> > relevant for cxsr, maybe it make sense to still call it disable_cxsr?
> >
> Would it be terrible if I were to disable CXSR for cursor changes too?

Yes, we need vblank waits around cxsr updates.

> Else I'll rename it to disable_cxsr.
> 
> ~Maarten

-- 
Ville Syrjälä
Intel OTC
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