Re: [PATCH v2 4/4] drm/i915: Calculate vlv/chv intermediate watermarks correctly, v2.

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

On Mon, May 01, 2017 at 03:34:34PM +0200, Maarten Lankhorst wrote:
> The watermarks it should calculate against are the old optimal watermarks.
> The currently active crtc watermarks are pure fiction, and are invalid in
> case of a nonblocking modeset, page flip enabling/disabling planes or any
> other reason.
> 
> When the crtc is disabled or during a modeset the intermediate watermarks
> don't need to be programmed separately, and could be directly assigned
> to the optimal watermarks.
> 
> Also rename crtc_state to new_crtc_state, to distinguish it from the old state.
> 
> Changes since v1:
> - Use intel_atomic_get_old_crtc_state. (ville)
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 20 ++++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 0f344b1fff45..a09396ee1f3d 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -1458,16 +1458,24 @@ static void vlv_atomic_update_fifo(struct intel_atomic_state *state,
>  
>  static int vlv_compute_intermediate_wm(struct drm_device *dev,
>  				       struct intel_crtc *crtc,
> -				       struct intel_crtc_state *crtc_state)
> +				       struct intel_crtc_state *new_crtc_state)
>  {
> -	struct vlv_wm_state *intermediate = &crtc_state->wm.vlv.intermediate;
> -	const struct vlv_wm_state *optimal = &crtc_state->wm.vlv.optimal;
> -	const struct vlv_wm_state *active = &crtc->wm.active.vlv;
> +	struct vlv_wm_state *intermediate = &new_crtc_state->wm.vlv.intermediate;
> +	const struct vlv_wm_state *optimal = &new_crtc_state->wm.vlv.optimal;
> +	const struct intel_crtc_state *old_crtc_state =
> +		intel_atomic_get_old_crtc_state(new_crtc_state->base.state, crtc);
> +	const struct vlv_wm_state *active = &old_crtc_state->wm.vlv.optimal;
>  	int level;
>  
> +	if (!new_crtc_state->base.active || drm_atomic_crtc_needs_modeset(&new_crtc_state->base)) {
> +		*intermediate = *optimal;
> +
> +		return 0;
> +	}
> +
>  	intermediate->num_levels = min(optimal->num_levels, active->num_levels);
>  	intermediate->cxsr = optimal->cxsr && active->cxsr &&
> -		!crtc_state->disable_cxsr;
> +		!new_crtc_state->disable_cxsr;

We need to consider disable_cxsr even in the modeset case.

>  
>  	for (level = 0; level < intermediate->num_levels; level++) {
>  		enum plane_id plane_id;
> @@ -1491,7 +1499,7 @@ static int vlv_compute_intermediate_wm(struct drm_device *dev,
>  	 * omit the post-vblank programming; only update if it's different.
>  	 */
>  	if (memcmp(intermediate, optimal, sizeof(*intermediate)) != 0)
> -		crtc_state->wm.need_postvbl_update = true;
> +		new_crtc_state->wm.need_postvbl_update = true;
>  
>  	return 0;
>  }
> -- 
> 2.9.3
> 
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-- 
Ville Syrjälä
Intel OTC
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