Re: [Intel-gfx] [PATCH v2 02/12] drm/i915: Make the CRTC state consistent during sanitize-disabling

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, May 04, 2023 at 02:10:38AM +0300, Imre Deak wrote:
> Make sure that the CRTC state is reset correctly, as expected after
> disabling the CRTC.
> 
> In particular this change will:
> - Zero all the CSC blob pointers after intel_crtc_free_hw_state()
>   has freed them.
> - Zero the shared DPLL and port PLL pointers and clear the
>   corresponding active flags in the PLL state.
> - Reset all the transcoder and pipe fields.
> 
> v2:
> - Reset fully the CRTC state. (Ville)
> - Clear pipe active flags in the DPLL state.
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_modeset_setup.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_modeset_setup.c b/drivers/gpu/drm/i915/display/intel_modeset_setup.c
> index eefa4018dc0c2..2ca66e49d8863 100644
> --- a/drivers/gpu/drm/i915/display/intel_modeset_setup.c
> +++ b/drivers/gpu/drm/i915/display/intel_modeset_setup.c
> @@ -88,13 +88,14 @@ static void intel_crtc_disable_noatomic(struct intel_crtc *crtc,
>  	crtc->active = false;
>  	crtc->base.enabled = false;
>  
> -	drm_WARN_ON(&i915->drm,
> -		    drm_atomic_set_mode_for_crtc(&crtc_state->uapi, NULL) < 0);
> -	crtc_state->uapi.active = false;
> -	crtc_state->uapi.connector_mask = 0;
> -	crtc_state->uapi.encoder_mask = 0;
> +	if (crtc_state->shared_dpll) {
> +		crtc_state->shared_dpll->state.pipe_mask &= ~BIT(pipe);

So that's basiclly unreference_shared_dpll(). I wonder if we can
refactor that a bit to by usable here?

> +		crtc_state->shared_dpll->active_mask &= ~BIT(pipe);
> +	}

Isn't this part of disable_shared_dpll()? Are we not calling that?

> +
> +	__drm_atomic_helper_crtc_destroy_state(&crtc_state->uapi);
>  	intel_crtc_free_hw_state(crtc_state);
> -	memset(&crtc_state->hw, 0, sizeof(crtc_state->hw));
> +	intel_crtc_state_reset(crtc_state, crtc);
>  
>  	for_each_encoder_on_crtc(&i915->drm, &crtc->base, encoder)
>  		encoder->base.crtc = NULL;
> -- 
> 2.37.2

-- 
Ville Syrjälä
Intel