Re: [PATCH 3/9] drm/i915/wm: Consolidate SAGV pipe active/interlace checks to common code

["Govindapillai, Vinod" <vinod.govindapillai@intel.com>]

On Tue, 2026-03-24 at 15:48 +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> There are no differences between the platforms when
> considering whether SAGV can be used when the pipe is
> inactive or using an interlaced mode. Consolidate the
> checks to common code.
> 
> Note that we weren't even checking for interlaced modes
> on TGL+, but since we've previously soft defeatured
> interlaced modes on TGL+ that was more or less fine.
> The hardware does still have the capability though,
> and in case we ever decide to resurrect it having the
> check seems like a good idea.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/skl_watermark.c | 15 ++++++---------
>  1 file changed, 6 insertions(+), 9 deletions(-)
> 

Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>

> diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c
> b/drivers/gpu/drm/i915/display/skl_watermark.c
> index bcdca1b99fe4..e37fde9f765d 100644
> --- a/drivers/gpu/drm/i915/display/skl_watermark.c
> +++ b/drivers/gpu/drm/i915/display/skl_watermark.c
> @@ -308,12 +308,6 @@ static bool skl_crtc_can_enable_sagv(const
> struct intel_crtc_state *crtc_state)
>  	enum plane_id plane_id;
>  	int max_level = INT_MAX;
>  
> -	if (!crtc_state->hw.active)
> -		return true;
> -
> -	if (crtc_state->hw.pipe_mode.flags &
> DRM_MODE_FLAG_INTERLACE)
> -		return false;
> -
>  	for_each_plane_id_on_crtc(crtc, plane_id) {
>  		const struct skl_plane_wm *wm =
>  			&crtc_state-
> >wm.skl.optimal.planes[plane_id];
> @@ -356,9 +350,6 @@ static bool tgl_crtc_can_enable_sagv(const struct
> intel_crtc_state *crtc_state)
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state-
> >uapi.crtc);
>  	enum plane_id plane_id;
>  
> -	if (!crtc_state->hw.active)
> -		return true;
> -
>  	for_each_plane_id_on_crtc(crtc, plane_id) {
>  		const struct skl_plane_wm *wm =
>  			&crtc_state-
> >wm.skl.optimal.planes[plane_id];
> @@ -388,6 +379,12 @@ bool intel_crtc_can_enable_sagv(const struct
> intel_crtc_state *crtc_state)
>  	if (crtc_state->inherited)
>  		return false;
>  
> +	if (!crtc_state->hw.active)
> +		return true;
> +
> +	if (crtc_state->hw.pipe_mode.flags &
> DRM_MODE_FLAG_INTERLACE)
> +		return false;
> +
>  	if (HAS_SAGV_WM(display))
>  		return tgl_crtc_can_enable_sagv(crtc_state);
>  	else