[Intel-gfx] [PATCH 11/12] drm/i915: Assert that VRR is off during vblank evasion if necessary

[Golani, Mitulkumar Ajitkumar]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Ville
> Syrjala
> Sent: 01 September 2023 18:35
> To: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH 11/12] drm/i915: Assert that VRR is off during
> vblank evasion if necessary
> 
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Whenever we change the actual transcoder timings (clock via seamless M/N,
> full modeset, (or soon) vtotal via LRR) we want the timing generator to be in
> non-VRR during the commit.
> Warn if we forgot to turn VRR off prior to vblank evasion.
> 
> Cc: Manasi Navare <navaremanasi at chromium.org>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_crtc.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c
> b/drivers/gpu/drm/i915/display/intel_crtc.c
> index a04076064f02..a39e31c1ca85 100644
> --- a/drivers/gpu/drm/i915/display/intel_crtc.c
> +++ b/drivers/gpu/drm/i915/display/intel_crtc.c
> @@ -493,6 +493,10 @@ static void intel_crtc_vblank_evade_scanlines(struct
> intel_atomic_state *state,
>  	adjusted_mode = &crtc_state->hw.adjusted_mode;
> 
>  	if (crtc->mode_flags & I915_MODE_FLAG_VRR) {
> +		/* timing changes should happen with VRR disabled */
> +		drm_WARN_ON(state->base.dev,
> intel_crtc_needs_modeset(new_crtc_state) ||
> +			    new_crtc_state->update_m_n);
> +

Changes LGTM
Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>

Regards,
Mitul
>  		if (intel_vrr_is_push_sent(crtc_state))
>  			*vblank_start =
> intel_vrr_vmin_vblank_start(crtc_state);
>  		else
> --
> 2.41.0