[PATCH v4 19/25] drm/i915/dsc: Add a power domain for VDSC on eDP/MIPI DSI

[Imre Deak]

On Tue, Sep 11, 2018 at 05:56:01PM -0700, Manasi Navare wrote:
> On Icelake, a separate power well PG2 is created for
> VDSC engine used for eDP/MIPI DSI. This patch adds a new
> display power domain for Power well 2.
> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Imre Deak <imre.deak at intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.h    |  1 +
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 12 ++++++------
>  2 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> index 3fe52788b4cf..bef71d27cdfe 100644
> --- a/drivers/gpu/drm/i915/intel_display.h
> +++ b/drivers/gpu/drm/i915/intel_display.h
> @@ -256,6 +256,7 @@ enum intel_display_power_domain {
>  	POWER_DOMAIN_MODESET,
>  	POWER_DOMAIN_GT_IRQ,
>  	POWER_DOMAIN_INIT,
> +	POWER_DOMAIN_VDSC_EDP_MIPI,

This is better named VDSC_PIPE_A. The other pipes have also VDSC
functionality which could be on separate power wells in the future.

>  
>  	POWER_DOMAIN_NUM,
>  };
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 480dadb1047b..146e2d6cf954 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -146,6 +146,8 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
>  		return "MODESET";
>  	case POWER_DOMAIN_GT_IRQ:
>  		return "GT_IRQ";
> +	case POWER_DOMAIN_VDSC_EDP_MIPI:
> +		return "VDSC_EDP_MIPI";
>  	default:
>  		MISSING_CASE(domain);
>  		return "?";
> @@ -1966,18 +1968,16 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
>  	BIT_ULL(POWER_DOMAIN_AUDIO) |			\
>  	BIT_ULL(POWER_DOMAIN_INIT))
>  	/*
> -	 * - transcoder WD
> -	 * - KVMR (HW control)
> + 	 * - eDP/MIPI DSI VDSC

We're not changing anything in the PW3 domains list, so why changing
the above?

>  	 */
>  #define ICL_PW_2_POWER_DOMAINS (			\
> -	ICL_PW_3_POWER_DOMAINS |			\
> -	BIT_ULL(POWER_DOMAIN_INIT))

The above is bogus, both the PW3 domains and the INIT domain should
stay included in the list of PW2 domains.

> +	BIT_ULL(POWER_DOMAIN_VDSC_EDP_MIPI))
>  	/*
> -	 * - eDP/DSI VDSC
> +	 * - transcoder WD

Why adding here the transcoder WD?

>  	 * - KVMR (HW control)
>  	 */
>  #define ICL_DISPLAY_DC_OFF_POWER_DOMAINS (		\
> -	ICL_PW_2_POWER_DOMAINS |			\
> +	ICL_PW_3_POWER_DOMAINS |			\

The PW2 domain list should stay included in the DC_OFF domain list (and
so no need to add the PW3 domain list either).

>  	BIT_ULL(POWER_DOMAIN_MODESET) |			\
>  	BIT_ULL(POWER_DOMAIN_AUX_A) |			\
>  	BIT_ULL(POWER_DOMAIN_INIT))
> -- 
> 2.18.0
>