Re: [PATCH 2/3] drm/atomic: Use explicit old/new state in drm_atomic_crtc_check()

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Nov 01, 2018 at 08:46:45PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Convert drm_atomic_crtc_check() over to using explicit old vs. new
> crtc states. Avoids the confusion of "what does crtc->state mean
> again?".

Yeah much better.

> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> ---
>  drivers/gpu/drm/drm_atomic.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 064c48075917..dde696181efe 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -315,9 +315,11 @@ drm_atomic_get_crtc_state(struct drm_atomic_state *state,
>  }
>  EXPORT_SYMBOL(drm_atomic_get_crtc_state);
>  
> -static int drm_atomic_crtc_check(struct drm_crtc *crtc,
> -		struct drm_crtc_state *state)
> +static int drm_atomic_crtc_check(const struct drm_crtc_state *old_crtc_state,
> +				 const struct drm_crtc_state *new_crtc_state)
>  {
> +	struct drm_crtc *crtc = new_crtc_state->crtc;
> +
>  	/* NOTE: we explicitly don't enforce constraints such as primary
>  	 * layer covering entire screen, since that is something we want
>  	 * to allow (on hw that supports it).  For hw that does not, it
> @@ -326,7 +328,7 @@ static int drm_atomic_crtc_check(struct drm_crtc *crtc,
>  	 * TODO: Add generic modeset state checks once we support those.
>  	 */
>  
> -	if (state->active && !state->enable) {
> +	if (new_crtc_state->active && !new_crtc_state->enable) {
>  		DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active without enabled\n",
>  				 crtc->base.id, crtc->name);
>  		return -EINVAL;
> @@ -336,14 +338,14 @@ static int drm_atomic_crtc_check(struct drm_crtc *crtc,
>  	 * as this is a kernel-internal detail that userspace should never
>  	 * be able to trigger. */
>  	if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
> -	    WARN_ON(state->enable && !state->mode_blob)) {
> +	    WARN_ON(new_crtc_state->enable && !new_crtc_state->mode_blob)) {
>  		DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled without mode blob\n",
>  				 crtc->base.id, crtc->name);
>  		return -EINVAL;
>  	}
>  
>  	if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
> -	    WARN_ON(!state->enable && state->mode_blob)) {
> +	    WARN_ON(!new_crtc_state->enable && new_crtc_state->mode_blob)) {
>  		DRM_DEBUG_ATOMIC("[CRTC:%d:%s] disabled with mode blob\n",
>  				 crtc->base.id, crtc->name);
>  		return -EINVAL;
> @@ -359,7 +361,8 @@ static int drm_atomic_crtc_check(struct drm_crtc *crtc,
>  	 * and legacy page_flip IOCTL which also reject service on a disabled
>  	 * pipe.
>  	 */
> -	if (state->event && !state->active && !crtc->state->active) {
> +	if (new_crtc_state->event &&
> +	    !new_crtc_state->active && !old_crtc_state->active) {
>  		DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requesting event but off\n",
>  				 crtc->base.id, crtc->name);
>  		return -EINVAL;
> @@ -965,7 +968,8 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
>  	struct drm_plane *plane;
>  	struct drm_plane_state *plane_state;
>  	struct drm_crtc *crtc;
> -	struct drm_crtc_state *crtc_state;
> +	struct drm_crtc_state *old_crtc_state;
> +	struct drm_crtc_state *new_crtc_state;
>  	struct drm_connector *conn;
>  	struct drm_connector_state *conn_state;
>  	int i, ret = 0;
> @@ -981,8 +985,8 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
>  		}
>  	}
>  
> -	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> -		ret = drm_atomic_crtc_check(crtc, crtc_state);
> +	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
> +		ret = drm_atomic_crtc_check(old_crtc_state, new_crtc_state);
>  		if (ret) {
>  			DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic core check failed\n",
>  					 crtc->base.id, crtc->name);
> @@ -1010,8 +1014,8 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
>  	}
>  
>  	if (!state->allow_modeset) {
> -		for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> -			if (drm_atomic_crtc_needs_modeset(crtc_state)) {
> +		for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
> +			if (drm_atomic_crtc_needs_modeset(new_crtc_state)) {
>  				DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requires full modeset\n",
>  						 crtc->base.id, crtc->name);
>  				return -EINVAL;
> -- 
> 2.18.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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