[PATCH v5 19/28] drm/i915/dsc: Add a power domain for VDSC on eDP/MIPI DSI

[Manasi Navare]

On Tue, Oct 16, 2018 at 10:19:06PM +0300, Ville Syrjälä wrote:
> On Tue, Oct 16, 2018 at 10:01:11PM +0300, Ville Syrjälä wrote:
> > On Fri, Oct 05, 2018 at 04:22:57PM -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.
> > > 
> > > v2:
> > > * Fix the power well mismatch CI error (Ville)
> > > * Rename as VDSC_PIPE_A (Imre)
> > > * Fix a whitespace (Anusha)
> > > * Fix Comments (Imre)
> > > 
> > > Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
> > > 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 | 4 +++-
> > >  2 files changed, 4 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> > > index 9eaba1bccae8..4c513169960c 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_PIPE_A,
> > 
> > I'd probably put it next to the other pipe related power domains.
> > So maybe after POWER_DOMAIN_PIPE_C_PANEL_FITTER.
> > 
> > And to match the current naming pattern it should be called
> > POWER_DOMAIN_PIPE_A_VDSC.
> 
> Hmm. We could also give it an alias TRANSCODER_EDP_VDSC. Making
> it an alias would avoid wasting yet another bit, but would make
> the code easier to understand as we wouldn't have to add comments
> explaining why we use a PIPE_A_VDSC power domain based on the
> usage of the EDP transcoder.
>

So you are suggesting adding an alias TRANSCODER_EDP_VDSC for POWER_DOMAIN_PIPE_A_VDSC?
But how does it avoid wasting another bit, since we would still have POWER_DOMAIN_PIPE_A_VDSC as a field
in enum power domains right?

Manasi
 
> The only slightly confusing piece would be
> intel_display_power_domain_str() as that would have to reuturn
> a string with both names perhaps?
> 
> > 
> > >  
> > >  	POWER_DOMAIN_NUM,
> > >  };
> > > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > > index 3cf8533e0834..3ed0a3a1015a 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_PIPE_A:
> > > +		return "VDSC_PIPE_A";
> > >  	default:
> > >  		MISSING_CASE(domain);
> > >  		return "?";
> > > @@ -1971,9 +1973,9 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
> > >  	 */
> > >  #define ICL_PW_2_POWER_DOMAINS (			\
> > >  	ICL_PW_3_POWER_DOMAINS |			\
> > > +	BIT_ULL(POWER_DOMAIN_VDSC_PIPE_A) |		\
> > >  	BIT_ULL(POWER_DOMAIN_INIT))
> > >  	/*
> > > -	 * - eDP/DSI VDSC
> > >  	 * - KVMR (HW control)
> > >  	 */
> > >  #define ICL_DISPLAY_DC_OFF_POWER_DOMAINS (		\
> > > -- 
> > > 2.18.0
> > 
> > -- 
> > Ville Syrjälä
> > Intel
> 
> -- 
> Ville Syrjälä
> Intel
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