[PATCH v2 3/3] drm/i915/xe3lpd: Update bandwidth parameters

[Matt Roper]

On Mon, Feb 17, 2025 at 12:35:25PM -0300, Gustavo Sousa wrote:
> Bandwidth parameters for Xe3_LPD have been updated with respect to
> previous display releases. Encode them into xe3lpd_sa_info and use that
> new struct.
> 
> Bspec: 68859
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>

Matches the spec.

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

> ---
>  drivers/gpu/drm/i915/display/intel_bw.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
> index 51b82979a8e4..32096d3c4b9f 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_bw.c
> @@ -404,6 +404,13 @@ static const struct intel_sa_info xe2_hpd_sa_info = {
>  	/* Other values not used by simplified algorithm */
>  };
>  
> +static const struct intel_sa_info xe3lpd_sa_info = {
> +	.deburst = 32,
> +	.deprogbwlimit = 65, /* GB/s */
> +	.displayrtids = 256,
> +	.derating = 10,
> +};
> +
>  static int icl_get_bw_info(struct drm_i915_private *dev_priv, const struct intel_sa_info *sa)
>  {
>  	struct intel_display *display = &dev_priv->display;
> @@ -759,7 +766,9 @@ void intel_bw_init_hw(struct drm_i915_private *dev_priv)
>  	if (!HAS_DISPLAY(display))
>  		return;
>  
> -	if (DISPLAY_VERx100(display) >= 1401 && display->platform.dgfx)
> +	if (DISPLAY_VER(display) >= 30)
> +		tgl_get_bw_info(dev_priv, &xe3lpd_sa_info);
> +	else if (DISPLAY_VERx100(display) >= 1401 && display->platform.dgfx)
>  		xe2_hpd_get_bw_info(dev_priv, &xe2_hpd_sa_info);
>  	else if (DISPLAY_VER(display) >= 14)
>  		tgl_get_bw_info(dev_priv, &mtl_sa_info);
> -- 
> 2.48.1
> 

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