[PATCH 4/6] drm/i915/xe3lpd: Update bandwidth parameters for display version 30.02

[Matt Roper]

On Tue, Jun 03, 2025 at 11:54:28PM +0530, Dnyaneshwar Bhadane wrote:
> From: Matt Atwood <matthew.s.atwood at intel.com>
> 
> Bandwidth parameters for WCL have been updated with respect to
> previous display releases. Encode them into xe3lpd_3002_sa_info and use
> that new struct.
> 
> Bspec: 68859
> Signed-off-by: Matt Atwood <matthew.s.atwood at intel.com>
> Signed-off-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane at intel.com>

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 a5dd2932b852..39b5f2759617 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_bw.c
> @@ -418,6 +418,13 @@ static const struct intel_sa_info xe3lpd_sa_info = {
>  	.derating = 10,
>  };
>  
> +static const struct intel_sa_info xe3lpd_3002_sa_info = {
> +	.deburst = 32,
> +	.deprogbwlimit = 22, /* GB/s */
> +	.displayrtids = 256,
> +	.derating = 10,
> +};
> +
>  static int icl_get_bw_info(struct intel_display *display, const struct intel_sa_info *sa)
>  {
>  	struct drm_i915_private *i915 = to_i915(display->drm);
> @@ -768,7 +775,9 @@ void intel_bw_init_hw(struct intel_display *display)
>  	if (!HAS_DISPLAY(display))
>  		return;
>  
> -	if (DISPLAY_VER(display) >= 30)
> +	if (DISPLAY_VERx100(display) >= 3002)
> +		tgl_get_bw_info(display, &xe3lpd_3002_sa_info);
> +	else if (DISPLAY_VER(display) >= 30)
>  		tgl_get_bw_info(display, &xe3lpd_sa_info);
>  	else if (DISPLAY_VERx100(display) >= 1401 && display->platform.dgfx &&
>  		 dram_info->type == INTEL_DRAM_GDDR_ECC)
> -- 
> 2.34.1
> 
> 

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