Re: [PATCH 1/2] drm/atomic-helper: Add option to update planes only on active crtc

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Op 22-07-15 om 16:30 schreef Daniel Vetter:
> With drivers supporting runtime pm it's generally not a good idea to
> touch the hardware when it's off. Add an option to the commit_planes
> helper to support this case.
>
> Note that the helpers already add all planes on a crtc when a modeset
> happens, hence plane updates will not be lost if drivers set this to
> true.
>
> Cc: Thierry Reding <treding@nvidia.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/drm_atomic_helper.c    | 15 +++++++++++++--
>  drivers/gpu/drm/exynos/exynos_drm_fb.c |  2 +-
>  drivers/gpu/drm/msm/msm_atomic.c       |  2 +-
>  drivers/gpu/drm/omapdrm/omap_drv.c     |  2 +-
>  drivers/gpu/drm/rcar-du/rcar_du_kms.c  |  2 +-
>  drivers/gpu/drm/sti/sti_drm_drv.c      |  2 +-
>  drivers/gpu/drm/tegra/drm.c            |  2 +-
>  include/drm/drm_atomic_helper.h        |  3 ++-
>  8 files changed, 21 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 91ad6bd13734..192412277586 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -989,7 +989,7 @@ int drm_atomic_helper_commit(struct drm_device *dev,
>  
>  	drm_atomic_helper_commit_modeset_disables(dev, state);
>  
> -	drm_atomic_helper_commit_planes(dev, state);
> +	drm_atomic_helper_commit_planes(dev, state, false);
>  
>  	drm_atomic_helper_commit_modeset_enables(dev, state);
>  
> @@ -1108,6 +1108,7 @@ EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
>   * drm_atomic_helper_commit_planes - commit plane state
>   * @dev: DRM device
>   * @old_state: atomic state object with old state structures
> + * @active_only: Only commit on active CRTC if set
>   *
>   * This function commits the new plane state using the plane and atomic helper
>   * functions for planes and crtcs. It assumes that the atomic state has already
> @@ -1122,7 +1123,8 @@ EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
>   * drm_atomic_helper_commit_planes_on_crtc() instead.
>   */
>  void drm_atomic_helper_commit_planes(struct drm_device *dev,
> -				     struct drm_atomic_state *old_state)
> +				     struct drm_atomic_state *old_state,
> +				     bool active_only)
>  {
>  	struct drm_crtc *crtc;
>  	struct drm_crtc_state *old_crtc_state;
> @@ -1138,6 +1140,9 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
>  		if (!funcs || !funcs->atomic_begin)
>  			continue;
>  
> +		if (active_only && !crtc->state->active)
> +			continue;
> +
>  		funcs->atomic_begin(crtc);
>  	}
>  
> @@ -1149,6 +1154,9 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
>  		if (!funcs)
>  			continue;
>  
> +		if (active_only && !plane->state->crtc->state->active)
> +			continue;
>
Find the null pointer deref. ;-)

Otherwise r-b.

~Maarten
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