[Intel-gfx] [PATCH 16/56] drm/i915/xelpd: Required bandwidth increases when VT-d is active

[Srivatsa, Anusha]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Matt
> Roper
> Sent: Thursday, March 11, 2021 2:36 PM
> To: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH 16/56] drm/i915/xelpd: Required bandwidth
> increases when VT-d is active
> 
> If VT-d is active, the memory bandwidth usage of the display is 5% higher.
> Take this into account when determining whether we can support a display
> configuration.
> 
> Bspec: 64631
> Cc: Matt Atwood <matthew.s.atwood at intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>

Reviewed-by: Anusha Srivatsa <anusha.srivatsa at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_bw.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.c
> b/drivers/gpu/drm/i915/display/intel_bw.c
> index 20dbc3759d27..23cf9bf31e41 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_bw.c
> @@ -344,6 +344,9 @@ static unsigned int intel_bw_data_rate(struct
> drm_i915_private *dev_priv,
>  	for_each_pipe(dev_priv, pipe)
>  		data_rate += bw_state->data_rate[pipe];
> 
> +	if (DISPLAY_VER(dev_priv) >= 13 && intel_vtd_active())
> +		data_rate = data_rate * 105 / 100;
> +
>  	return data_rate;
>  }
> 
> --
> 2.25.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx