Re: [PATCH 01/13] drm/atomic: Only update crtc->x/y if it's part of the state.

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Jul 16, 2015 at 10:59:14AM +0200, Maarten Lankhorst wrote:
> Cc: dri-devel@lists.freedesktop.org
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  drivers/gpu/drm/drm_atomic_helper.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 0898afbc9e23..70e69904291d 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -667,8 +667,11 @@ drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
>  	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
>  		crtc->mode = crtc->state->mode;
>  		crtc->enabled = crtc->state->enable;
> -		crtc->x = crtc->primary->state->src_x >> 16;
> -		crtc->y = crtc->primary->state->src_y >> 16;
> +
> +		if (drm_atomic_get_existing_plane_state(old_state, crtc->primary)) {
> +			crtc->x = crtc->primary->state->src_x >> 16;
> +			crtc->y = crtc->primary->state->src_y >> 16;
> +		}

What's the benefit here of only updating when something changed? The
atomic state should be the master source so copying a few too many times
shouldn't matter really.
-Daniel

>  
>  		if (crtc->state->enable)
>  			drm_calc_timestamping_constants(crtc,
> -- 
> 2.1.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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