[Intel-xe] [PATCH 22/42] drm/i915/xe2lpd: Add DC state support

[Srivatsa, Anusha]

> -----Original Message-----
> From: De Marchi, Lucas <lucas.demarchi at intel.com>
> Sent: Wednesday, August 23, 2023 10:07 AM
> To: intel-xe at lists.freedesktop.org; intel-gfx at lists.freedesktop.org
> Cc: Roper, Matthew D <matthew.d.roper at intel.com>; Srivatsa, Anusha
> <anusha.srivatsa at intel.com>; De Marchi, Lucas <lucas.demarchi at intel.com>
> Subject: [PATCH 22/42] drm/i915/xe2lpd: Add DC state support
> 
> From: Matt Roper <matthew.d.roper at intel.com>
> 
> Xe2_LPD supports DC5, DC6, and DC9 (DC3CO no longer exists).  The overall
> programming and requirements to enter DC states are similar to those of
> Xe_LPD+ although AUX transactions do not require DC5/DC6 exit as they did
> previously.
> 
> Bspec: 68851, 68857, 68886, 69115
> Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>	

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

> ---
>  .../drm/i915/display/intel_display_power.c    |  4 +++-
>  .../i915/display/intel_display_power_map.c    | 19 +++++++++++++++++++
>  2 files changed, 22 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 7e2059abae9a..508a3225d9f0 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -944,7 +944,9 @@ static u32 get_allowed_dc_mask(const struct
> drm_i915_private *dev_priv,
>  	if (!HAS_DISPLAY(dev_priv))
>  		return 0;
> 
> -	if (IS_DG2(dev_priv))
> +	if (DISPLAY_VER(dev_priv) >= 20)
> +		max_dc = 2;
> +	else if (IS_DG2(dev_priv))
>  		max_dc = 1;
>  	else if (IS_DG1(dev_priv))
>  		max_dc = 3;
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power_map.c
> b/drivers/gpu/drm/i915/display/intel_display_power_map.c
> index cef3b313c9f5..d74a742437c3 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power_map.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power_map.c
> @@ -1570,9 +1570,28 @@ static const struct i915_power_well_desc
> xe2lpd_power_wells_pica[] = {
>  	},
>  };
> 
> +I915_DECL_PW_DOMAINS(xe2lpd_pwdoms_dc_off,
> +	POWER_DOMAIN_DC_OFF,
> +	XELPD_PW_C_POWER_DOMAINS,
> +	XELPD_PW_D_POWER_DOMAINS,
> +	POWER_DOMAIN_AUDIO_MMIO,
> +	POWER_DOMAIN_MODESET,
> +	POWER_DOMAIN_INIT);
> +
> +static const struct i915_power_well_desc xe2lpd_power_wells_dcoff[] = {
> +	{
> +		.instances = &I915_PW_INSTANCES(
> +			I915_PW("DC_off", &xe2lpd_pwdoms_dc_off,
> +				.id = SKL_DISP_DC_OFF),
> +		),
> +		.ops = &gen9_dc_off_power_well_ops,
> +	},
> +};
> +
>  static const struct i915_power_well_desc_list xe2lpd_power_wells[] = {
>  	I915_PW_DESCRIPTORS(i9xx_power_wells_always_on),
>  	I915_PW_DESCRIPTORS(icl_power_wells_pw_1),
> +	I915_PW_DESCRIPTORS(xe2lpd_power_wells_dcoff),
>  	I915_PW_DESCRIPTORS(xelpdp_power_wells_main),
>  	I915_PW_DESCRIPTORS(xe2lpd_power_wells_pica),
>  };
> --
> 2.40.1