[Intel-gfx] [PATCH v2 06/22] drm/i915/rkl: Update memory bandwidth parameters

[Ville Syrjälä]

On Mon, May 04, 2020 at 03:52:11PM -0700, Matt Roper wrote:
> The RKL platform has different memory characteristics from past
> platforms.  Update the values used by our memory bandwidth calculations
> accordingly.
> 
> Bspec: 53998
> Cc: James Ausmus <james.ausmus at intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_bw.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
> index 6e7cc3a4f1aa..d435cc6019e4 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_bw.c
> @@ -176,6 +176,12 @@ static const struct intel_sa_info tgl_sa_info = {
>  	.displayrtids = 256,
>  };
>  
> +static const struct intel_sa_info rkl_sa_info = {
> +	.deburst = 16,
> +	.deprogbwlimit = 20, /* GB/s */
> +	.displayrtids = 128,
> +};

Numbers appear to match the spec.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> +
>  static int icl_get_bw_info(struct drm_i915_private *dev_priv, const struct intel_sa_info *sa)
>  {
>  	struct intel_qgv_info qi = {};
> @@ -271,7 +277,9 @@ void intel_bw_init_hw(struct drm_i915_private *dev_priv)
>  	if (!HAS_DISPLAY(dev_priv))
>  		return;
>  
> -	if (IS_GEN(dev_priv, 12))
> +	if (IS_ROCKETLAKE(dev_priv))
> +		icl_get_bw_info(dev_priv, &rkl_sa_info);
> +	else if (IS_GEN(dev_priv, 12))
>  		icl_get_bw_info(dev_priv, &tgl_sa_info);
>  	else if (IS_GEN(dev_priv, 11))
>  		icl_get_bw_info(dev_priv, &icl_sa_info);
> -- 
> 2.24.1
> 
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-- 
Ville Syrjälä
Intel