[PATCH 52/53] drm/i915/dg2: Update to bigjoiner path

[Navare, Manasi]

On Thu, Jul 01, 2021 at 01:24:26PM -0700, Matt Roper wrote:
> From: Animesh Manna <animesh.manna at intel.com>
> 
> In verify_mpllb_state() encoder is retrieved from best_encoder
> of connector_state. As there will be only one connector_state
> for bigjoiner and checking encoder may not be needed for
> bigjoiner-slave. This code path related to mpll is done on dg2
> and need this fix to avoid null pointer dereference issue.
> 
> Cc: Manasi Navare <manasi.d.navare at intel.com>
> Signed-off-by: Animesh Manna <animesh.manna at intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>

Reviewed-by: Manasi Navare <manasi.d.navare at intel.com>

Manasi

> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 9655f1b1b41b..3f4e811145b6 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -9153,6 +9153,9 @@ verify_mpllb_state(struct intel_atomic_state *state,
>  	if (!new_crtc_state->hw.active)
>  		return;
>  
> +	if (new_crtc_state->bigjoiner_slave)
> +		return;
> +
>  	encoder = intel_get_crtc_new_encoder(state, new_crtc_state);
>  	intel_mpllb_readout_hw_state(encoder, &mpllb_hw_state);
>  
> -- 
> 2.25.4
>