[Intel-gfx] [PATCH v3] drm/atomic: Add the crtc to affected crtc only if uapi.enable = true

[Navare, Manasi]

Hi Ville,

Could you take a look at this, this addresses teh review comments from prev version

Manasi

On Mon, Oct 04, 2021 at 04:59:13AM -0700, Manasi Navare wrote:
> In case of a modeset where a mode gets split across mutiple CRTCs
> in the driver specific implementation (bigjoiner in i915) we wrongly count
> the affected CRTCs based on the drm_crtc_mask and indicate the stolen CRTC as
> an affected CRTC in atomic_check_only().
> This triggers a warning since affected CRTCs doent match requested CRTC.
> 
> To fix this in such bigjoiner configurations, we should only
> increment affected crtcs if that CRTC is enabled in UAPI not
> if it is just used internally in the driver to split the mode.
> 
> v3: Add the same uapi crtc_state->enable check in requested
> crtc calc (Ville)
> 
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Simon Ser <contact at emersion.fr>
> Cc: Pekka Paalanen <pekka.paalanen at collabora.co.uk>
> Cc: Daniel Stone <daniels at collabora.com>
> Cc: Daniel Vetter <daniel.vetter at intel.com>
> Cc: dri-devel at lists.freedesktop.org
> Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
> ---
>  drivers/gpu/drm/drm_atomic.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index ff1416cd609a..a1e4c7905ebb 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1310,8 +1310,10 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
>  
>  	DRM_DEBUG_ATOMIC("checking %p\n", state);
>  
> -	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
> -		requested_crtc |= drm_crtc_mask(crtc);
> +	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
> +		if (new_crtc_state->enable)
> +			requested_crtc |= drm_crtc_mask(crtc);
> +	}
>  
>  	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
>  		ret = drm_atomic_plane_check(old_plane_state, new_plane_state);
> @@ -1360,8 +1362,10 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
>  		}
>  	}
>  
> -	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
> -		affected_crtc |= drm_crtc_mask(crtc);
> +	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
> +		if (new_crtc_state->enable)
> +			affected_crtc |= drm_crtc_mask(crtc);
> +	}
>  
>  	/*
>  	 * For commits that allow modesets drivers can add other CRTCs to the
> -- 
> 2.19.1
>