[Intel-gfx] [PATCH v3 17/25] drm/i915/dp_mst: Fix PBN calculation with FEC overhead

[Lisovskiy, Stanislav]

On Thu, Sep 14, 2023 at 10:26:51PM +0300, Imre Deak wrote:
> On 8b/10b MST links the PBN value for DSC streams must be calculated
> accounting for the FEC overhead. The same applies to 8b/10b non-DSC
> streams if there is another DSC stream on the same link. Fix up the PBN
> calculation accordingly.
> 
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dp_mst.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index 01291bbb44693..c1fea894d3774 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -110,7 +110,8 @@ static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
>  
>  		crtc_state->pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock,
>  						       bpp << 4,
> -						       false);
> +						       (dsc || crtc_state->fec_enable) &&
> +							!intel_dp_is_uhbr(crtc_state));
>  
>  		slots = drm_dp_atomic_find_time_slots(state, &intel_dp->mst_mgr,
>  						      connector->port,
> -- 
> 2.37.2
>