[PATCH v3 14/21] drm/i915/xe2hpd: Do not program MBUS_DBOX BW credits

[Matt Roper]

On Mon, Apr 15, 2024 at 01:44:16PM +0530, Balasubramani Vivekanandan wrote:
> From: José Roberto de Souza <jose.souza at intel.com>
> 
> No display IP beyond Xe_LPD+ has "BW credits" bits in MBUS_DBOX_CTL
> register. Restrict the programming only to Xe_LPD+.
> 
> BSpec: 49213
> CC: Matt Roper <matthew.d.roper at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan at intel.com>

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

> ---
>  drivers/gpu/drm/i915/display/skl_watermark.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
> index 8436af8525da..baa4b5ad96b7 100644
> --- a/drivers/gpu/drm/i915/display/skl_watermark.c
> +++ b/drivers/gpu/drm/i915/display/skl_watermark.c
> @@ -3604,7 +3604,7 @@ static void intel_mbus_dbox_update(struct intel_atomic_state *state)
>  	for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc, new_dbuf_state->active_pipes) {
>  		u32 pipe_val = val;
>  
> -		if (DISPLAY_VER(i915) >= 14) {
> +		if (DISPLAY_VER_FULL(i915) == IP_VER(14, 0)) {
>  			if (xelpdp_is_only_pipe_per_dbuf_bank(crtc->pipe,
>  							      new_dbuf_state->active_pipes))
>  				pipe_val |= MBUS_DBOX_BW_8CREDITS_MTL;
> -- 
> 2.25.1
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation