Re: [PATCH v2 08/11] drm/i915/gen9+: Use the watermarks from crtc_state for everything, v2.

[Matt Roper <matthew.d.roper@intel.com>]

On Wed, Oct 26, 2016 at 03:41:36PM +0200, Maarten Lankhorst wrote:
> There's no need to keep a duplicate skl_pipe_wm around any more,
> everything can be discovered from crtc_state, which we pass around
> correctly now even in case of plane disable.
> 
> The copy in intel_crtc->wm.skl.active is equal to
> crtc_state->wm.skl.optimal after the atomic commit completes.
> It's useful for two-step watermark programming, but not required for
> gen9+ which does it in a single step. We can pull the old allocation
> from old_crtc_state.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Matt Roper <matthew.d.roper@intel.com>
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_display.c |  2 +-
>  drivers/gpu/drm/i915/intel_drv.h     |  1 -
>  drivers/gpu/drm/i915/intel_pm.c      | 18 ++++++++----------
>  3 files changed, 9 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 48eb0635ec0f..592a6ec354a7 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13478,7 +13478,7 @@ static void verify_wm_state(struct drm_crtc *crtc,
>  		return;
>  
>  	skl_pipe_wm_get_hw_state(crtc, &hw_wm);
> -	sw_wm = &intel_crtc->wm.active.skl;
> +	sw_wm = &to_intel_crtc_state(new_state)->wm.skl.optimal;
>  
>  	skl_ddb_get_hw_state(dev_priv, &hw_ddb);
>  	sw_ddb = &dev_priv->wm.skl_hw.ddb;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 73be640fad36..77a0a73e37b0 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -723,7 +723,6 @@ struct intel_crtc {
>  		/* watermarks currently being used  */
>  		union {
>  			struct intel_pipe_wm ilk;
> -			struct skl_pipe_wm skl;
>  		} active;
>  
>  		/* allow CxSR on this pipe */
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 5ff35833b258..fe4bc97ed56a 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3930,11 +3930,11 @@ bool skl_ddb_allocation_overlaps(struct drm_atomic_state *state,
>  }
>  
>  static int skl_update_pipe_wm(struct drm_crtc_state *cstate,
> -			      struct skl_ddb_allocation *ddb, /* out */
> +			      const struct skl_pipe_wm *old_pipe_wm,
>  			      struct skl_pipe_wm *pipe_wm, /* out */
> +			      struct skl_ddb_allocation *ddb, /* out */
>  			      bool *changed /* out */)
>  {
> -	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->crtc);
>  	struct intel_crtc_state *intel_cstate = to_intel_crtc_state(cstate);
>  	int ret;
>  
> @@ -3942,7 +3942,7 @@ static int skl_update_pipe_wm(struct drm_crtc_state *cstate,
>  	if (ret)
>  		return ret;
>  
> -	if (!memcmp(&intel_crtc->wm.active.skl, pipe_wm, sizeof(*pipe_wm)))
> +	if (!memcmp(old_pipe_wm, pipe_wm, sizeof(*pipe_wm)))
>  		*changed = false;
>  	else
>  		*changed = true;
> @@ -4177,10 +4177,12 @@ skl_compute_wm(struct drm_atomic_state *state)
>  	for_each_crtc_in_state(state, crtc, cstate, i) {
>  		struct intel_crtc_state *intel_cstate =
>  			to_intel_crtc_state(cstate);
> +		const struct skl_pipe_wm *old_pipe_wm =
> +			&to_intel_crtc_state(crtc->state)->wm.skl.optimal;
>  
>  		pipe_wm = &intel_cstate->wm.skl.optimal;
> -		ret = skl_update_pipe_wm(cstate, &results->ddb, pipe_wm,
> -					 &changed);
> +		ret = skl_update_pipe_wm(cstate, old_pipe_wm, pipe_wm,
> +					 &results->ddb, &changed);
>  		if (ret)
>  			return ret;
>  
> @@ -4224,8 +4226,6 @@ static void skl_update_wm(struct drm_crtc *crtc)
>  	if ((results->dirty_pipes & drm_crtc_mask(crtc)) == 0)
>  		return;
>  
> -	intel_crtc->wm.active.skl = *pipe_wm;
> -
>  	mutex_lock(&dev_priv->wm.wm_mutex);
>  
>  	/*
> @@ -4395,10 +4395,8 @@ void skl_wm_get_hw_state(struct drm_device *dev)
>  
>  		skl_pipe_wm_get_hw_state(crtc, &cstate->wm.skl.optimal);
>  
> -		if (intel_crtc->active) {
> +		if (intel_crtc->active)
>  			hw->dirty_pipes |= drm_crtc_mask(crtc);
> -			intel_crtc->wm.active.skl = cstate->wm.skl.optimal;
> -		}
>  	}
>  
>  	if (dev_priv->active_crtcs) {
> -- 
> 2.7.4
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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