Re: [PATCH v3 12/13] drm/i915: Only update mode related state if a modeset happened.

[Daniel Vetter <daniel@ffwll.ch>]

On Wed, Aug 05, 2015 at 12:37:10PM +0200, Maarten Lankhorst wrote:
> The rest will be a noop anyway, since without modeset there will be
> no updated dplls and no modeset state to update.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 30 +++++++-----------------------
>  1 file changed, 7 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 1fd8b7dec7da..aa444cbc2262 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12181,33 +12181,15 @@ fail:
>  	return ret;
>  }
>  
> -static bool intel_crtc_in_use(struct drm_crtc *crtc)
> -{
> -	struct drm_encoder *encoder;
> -	struct drm_device *dev = crtc->dev;
> -
> -	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
> -		if (encoder->crtc == crtc)
> -			return true;
> -
> -	return false;
> -}
> -
>  static void
> -intel_modeset_update_state(struct drm_atomic_state *state)
> +intel_modeset_update_crtc_state(struct drm_atomic_state *state)
>  {
>  	struct drm_crtc *crtc;
>  	struct drm_crtc_state *crtc_state;
>  	int i;
>  
> -	intel_shared_dpll_commit(state);

This should be right next to swap_state, and we should probably rename it
to be consistent.

> -
> -	drm_atomic_helper_update_legacy_modeset_state(state->dev, state);

This helper should always work, why try to optimize things?

> -
>  	/* Double check state. */
>  	for_each_crtc_in_state(state, crtc, crtc_state, i) {
> -		WARN_ON(crtc->state->enable != intel_crtc_in_use(crtc));

I guess this WARN_ON should be moved into the state checker? Or entirely
removed if redundant.

> -
>  		to_intel_crtc(crtc)->config = to_intel_crtc_state(crtc->state);
>  
>  		/* Update hwmode for vblank functions */
> @@ -13110,12 +13092,14 @@ static int intel_atomic_commit(struct drm_device *dev,
>  
>  	/* Only after disabling all output pipelines that will be changed can we
>  	 * update the the output configuration. */
> -	intel_modeset_update_state(state);
> +	intel_modeset_update_crtc_state(state);
>  
> -	/* The state has been swaped above, so state actually contains the
> -	 * old state now. */
> -	if (any_ms)
> +	if (any_ms) {
> +		intel_shared_dpll_commit(state);
> +
> +		drm_atomic_helper_update_legacy_modeset_state(state->dev, state);
>  		modeset_update_crtc_power_domains(state);
> +	}
>  
>  	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
>  	for_each_crtc_in_state(state, crtc, crtc_state, i) {
> -- 
> 2.1.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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