[Intel-gfx] [PATCH v5 21/22] drm/i915/dg1: DG1 does not support DC6

[Souza, Jose]

On Fri, 2020-07-24 at 14:39 -0700, Lucas De Marchi wrote:
> From: Anshuman Gupta <
> anshuman.gupta at intel.com
> >
> 
> DC6 is not supported on DG1, so change the allowed DC mask for DG1.
> 
> Cc: Uma Shankar <
> uma.shankar at intel.com
> >
> Signed-off-by: Anshuman Gupta <
> anshuman.gupta at intel.com
> >
> ---
>  drivers/gpu/drm/i915/display/intel_display_power.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> index 21f39c94056e..389a0f2d3a14 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -4689,7 +4689,10 @@ static u32 get_allowed_dc_mask(const struct drm_i915_private *dev_priv,
>  	int max_dc;
>  
>  	if (INTEL_GEN(dev_priv) >= 12) {
> -		max_dc = 4;
> +		if (IS_DG1(dev_priv))

Better change to IS_DGFX() as DC6 is a SOC power-saving state, no discrete card will enter it.
With this change:
Reviewed-by: José Roberto de Souza <jose.souza at intel.com>

> +			max_dc = 3;
> +		else
> +			max_dc = 4;
>  		/*
>  		 * DC9 has a separate HW flow from the rest of the DC states,
>  		 * not depending on the DMC firmware. It's needed by system
>