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Date: Thu, 10 Nov 2022 20:57:43 +0200
From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= <ville.syrjala@linux.intel.com>
To: Imre Deak <imre.deak@intel.com>
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Subject: Re: [Intel-gfx] [PATCH v3 4/9] drm/i915/tgl+: Enable display DC
 power states on all eDP ports
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On Thu, Nov 10, 2022 at 08:52:00PM +0200, Ville Syrjälä wrote:
> On Tue, Nov 08, 2022 at 05:18:25PM +0200, Imre Deak wrote:
> > Starting with TGL eDP is supported on ports B+ (besides port A), so make
> > sure DC states are not blocked on any such ports. For this add an
> > AUX_IO_<port> power domain for each port with eDP support. These domains
> > similarly to AUX_IO_A enable only the AUX_IO_<port> power well for an
> > enabled port, whereas the existing AUX_<port> domains enable both the
> > AUX_IO_<port> and the DC_OFF power wells as required by DP AUX transfers.
> > 
> > v2: (Ville)
> > - Split the change using AUX vs. AUX_IO on port A to a separate patch.
> > - Select AUX_IO vs. AUX based on crtc_state->has_psr instead of
> >   is_edp().
> > v3:
> > - Rebased on checking intel_encoder_can_psr() instead of crtc->has_psr.
> > 
> > Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > Signed-off-by: Imre Deak <imre.deak@intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_ddi.c      |  6 ++-
> >  .../drm/i915/display/intel_display_power.c    | 30 +++++++++++
> >  .../drm/i915/display/intel_display_power.h    |  7 +++
> >  .../i915/display/intel_display_power_map.c    | 53 +++++++++++++++++--
> >  4 files changed, 89 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> > index ca236cd7f9b76..a087609223c60 100644
> > --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> > @@ -848,6 +848,8 @@ bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
> >  static enum intel_display_power_domain
> >  intel_ddi_main_link_aux_domain(struct intel_digital_port *dig_port)
> >  {
> > +	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> > +
> >  	/* ICL+ HW requires corresponding AUX IOs to be powered up for PSR with
> >  	 * DC states enabled at the same time, while for driver initiated AUX
> >  	 * transfers we need the same AUX IOs to be powered but with DC states
> > @@ -860,8 +862,8 @@ intel_ddi_main_link_aux_domain(struct intel_digital_port *dig_port)
> >  	 * Note that PSR is enabled only on Port A even though this function
> >  	 * returns the correct domain for other ports too.
> >  	 */
> > -	if (dig_port->aux_ch == AUX_CH_A && intel_encoder_can_psr(&dig_port->base))
> > -		return POWER_DOMAIN_AUX_IO_A;
> > +	if (intel_encoder_can_psr(&dig_port->base))
> > +		return intel_display_power_aux_io_domain(i915, dig_port->aux_ch);
> >  	else
> >  		return intel_aux_power_domain(dig_port);
> >  }
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> > index 78f1749397e1d..61c6a3616db08 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> > @@ -131,6 +131,16 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
> >  		return "AUDIO_PLAYBACK";
> >  	case POWER_DOMAIN_AUX_IO_A:
> >  		return "AUX_IO_A";
> > +	case POWER_DOMAIN_AUX_IO_B:
> > +		return "AUX_IO_B";
> > +	case POWER_DOMAIN_AUX_IO_C:
> > +		return "AUX_IO_C";
> > +	case POWER_DOMAIN_AUX_IO_D:
> > +		return "AUX_IO_D";
> > +	case POWER_DOMAIN_AUX_IO_E:
> > +		return "AUX_IO_E";
> > +	case POWER_DOMAIN_AUX_IO_F:
> > +		return "AUX_IO_F";
> >  	case POWER_DOMAIN_AUX_A:
> >  		return "AUX_A";
> >  	case POWER_DOMAIN_AUX_B:
> > @@ -2356,6 +2366,7 @@ struct intel_ddi_port_domains {
> >  
> >  	enum intel_display_power_domain ddi_lanes;
> >  	enum intel_display_power_domain ddi_io;
> > +	enum intel_display_power_domain aux_io;
> >  	enum intel_display_power_domain aux_legacy_usbc;
> >  	enum intel_display_power_domain aux_tbt;
> >  };
> > @@ -2370,6 +2381,7 @@ i9xx_port_domains[] = {
> >  
> >  		.ddi_lanes = POWER_DOMAIN_PORT_DDI_LANES_A,
> >  		.ddi_io = POWER_DOMAIN_PORT_DDI_IO_A,
> > +		.aux_io = POWER_DOMAIN_AUX_IO_A,
> >  		.aux_legacy_usbc = POWER_DOMAIN_AUX_A,
> >  		.aux_tbt = POWER_DOMAIN_INVALID,
> >  	},
> > @@ -2385,6 +2397,7 @@ d11_port_domains[] = {
> >  
> >  		.ddi_lanes = POWER_DOMAIN_PORT_DDI_LANES_A,
> >  		.ddi_io = POWER_DOMAIN_PORT_DDI_IO_A,
> > +		.aux_io = POWER_DOMAIN_AUX_IO_A,
> >  		.aux_legacy_usbc = POWER_DOMAIN_AUX_A,
> >  		.aux_tbt = POWER_DOMAIN_INVALID,
> >  	}, {
> > @@ -2395,6 +2408,7 @@ d11_port_domains[] = {
> >  
> >  		.ddi_lanes = POWER_DOMAIN_PORT_DDI_LANES_C,
> >  		.ddi_io = POWER_DOMAIN_PORT_DDI_IO_C,
> > +		.aux_io = POWER_DOMAIN_AUX_IO_C,
> >  		.aux_legacy_usbc = POWER_DOMAIN_AUX_C,
> >  		.aux_tbt = POWER_DOMAIN_AUX_TBT1,
> >  	},
> > @@ -2410,6 +2424,7 @@ d12_port_domains[] = {
> >  
> >  		.ddi_lanes = POWER_DOMAIN_PORT_DDI_LANES_A,
> >  		.ddi_io = POWER_DOMAIN_PORT_DDI_IO_A,
> > +		.aux_io = POWER_DOMAIN_AUX_IO_A,
> >  		.aux_legacy_usbc = POWER_DOMAIN_AUX_A,
> >  		.aux_tbt = POWER_DOMAIN_INVALID,
> >  	}, {
> > @@ -2420,6 +2435,7 @@ d12_port_domains[] = {
> >  
> >  		.ddi_lanes = POWER_DOMAIN_PORT_DDI_LANES_TC1,
> >  		.ddi_io = POWER_DOMAIN_PORT_DDI_IO_TC1,
> > +		.aux_io = POWER_DOMAIN_INVALID,
> >  		.aux_legacy_usbc = POWER_DOMAIN_AUX_USBC1,
> >  		.aux_tbt = POWER_DOMAIN_AUX_TBT1,
> >  	},
> > @@ -2435,6 +2451,7 @@ d13_port_domains[] = {
> >  
> >  		.ddi_lanes = POWER_DOMAIN_PORT_DDI_LANES_A,
> >  		.ddi_io = POWER_DOMAIN_PORT_DDI_IO_A,
> > +		.aux_io = POWER_DOMAIN_AUX_IO_A,
> >  		.aux_legacy_usbc = POWER_DOMAIN_AUX_A,
> >  		.aux_tbt = POWER_DOMAIN_INVALID,
> >  	}, {
> > @@ -2445,6 +2462,7 @@ d13_port_domains[] = {
> >  
> >  		.ddi_lanes = POWER_DOMAIN_PORT_DDI_LANES_TC1,
> >  		.ddi_io = POWER_DOMAIN_PORT_DDI_IO_TC1,
> > +		.aux_io = POWER_DOMAIN_INVALID,
> >  		.aux_legacy_usbc = POWER_DOMAIN_AUX_USBC1,
> >  		.aux_tbt = POWER_DOMAIN_AUX_TBT1,
> >  	}, {
> > @@ -2455,6 +2473,7 @@ d13_port_domains[] = {
> >  
> >  		.ddi_lanes = POWER_DOMAIN_PORT_DDI_LANES_D,
> >  		.ddi_io = POWER_DOMAIN_PORT_DDI_IO_D,
> > +		.aux_io = POWER_DOMAIN_AUX_IO_D,
> >  		.aux_legacy_usbc = POWER_DOMAIN_AUX_D,
> >  		.aux_tbt = POWER_DOMAIN_INVALID,
> >  	},
> > @@ -2532,6 +2551,17 @@ intel_port_domains_for_aux_ch(struct drm_i915_private *i915, enum aux_ch aux_ch)
> >  	return NULL;
> >  }
> >  
> > +enum intel_display_power_domain
> > +intel_display_power_aux_io_domain(struct drm_i915_private *i915, enum aux_ch aux_ch)
> > +{
> > +	const struct intel_ddi_port_domains *domains = intel_port_domains_for_aux_ch(i915, aux_ch);
> > +
> > +	if (drm_WARN_ON(&i915->drm, !domains) || domains->aux_io == POWER_DOMAIN_INVALID)
> 
> Was there some valid use case for the INVALID? If not I'd include
> it in the warn as well.
> 
> > +		return POWER_DOMAIN_AUX_IO_A;

Hmm. And should we just return INVALID here? I think you added a check
for that in the caller.

> > +
> > +	return domains->aux_io + (int)(aux_ch - domains->aux_ch_start);
> > +}
> > +
> >  enum intel_display_power_domain
> >  intel_display_power_legacy_aux_domain(struct drm_i915_private *i915, enum aux_ch aux_ch)
> >  {
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h b/drivers/gpu/drm/i915/display/intel_display_power.h
> > index dd0ad99f17056..73c7db969dde6 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power.h
> > @@ -79,6 +79,11 @@ enum intel_display_power_domain {
> >  	POWER_DOMAIN_AUDIO_PLAYBACK,
> >  
> >  	POWER_DOMAIN_AUX_IO_A,
> > +	POWER_DOMAIN_AUX_IO_B,
> > +	POWER_DOMAIN_AUX_IO_C,
> > +	POWER_DOMAIN_AUX_IO_D,
> > +	POWER_DOMAIN_AUX_IO_E,
> > +	POWER_DOMAIN_AUX_IO_F,
> >  
> >  	POWER_DOMAIN_AUX_A,
> >  	POWER_DOMAIN_AUX_B,
> > @@ -255,6 +260,8 @@ intel_display_power_ddi_lanes_domain(struct drm_i915_private *i915, enum port po
> >  enum intel_display_power_domain
> >  intel_display_power_ddi_io_domain(struct drm_i915_private *i915, enum port port);
> >  enum intel_display_power_domain
> > +intel_display_power_aux_io_domain(struct drm_i915_private *i915, enum aux_ch aux_ch);
> > +enum intel_display_power_domain
> >  intel_display_power_legacy_aux_domain(struct drm_i915_private *i915, enum aux_ch aux_ch);
> >  enum intel_display_power_domain
> >  intel_display_power_tbt_aux_domain(struct drm_i915_private *i915, enum aux_ch aux_ch);
> > 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 43454022e6a66..b82c0d0a80c5f 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power_map.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power_map.c
> > @@ -170,6 +170,8 @@ I915_DECL_PW_DOMAINS(vlv_pwdoms_display,
> >  	POWER_DOMAIN_VGA,
> >  	POWER_DOMAIN_AUDIO_MMIO,
> >  	POWER_DOMAIN_AUDIO_PLAYBACK,
> > +	POWER_DOMAIN_AUX_IO_B,
> > +	POWER_DOMAIN_AUX_IO_C,
> >  	POWER_DOMAIN_AUX_B,
> >  	POWER_DOMAIN_AUX_C,
> >  	POWER_DOMAIN_GMBUS,
> > @@ -179,6 +181,8 @@ I915_DECL_PW_DOMAINS(vlv_pwdoms_dpio_cmn_bc,
> >  	POWER_DOMAIN_PORT_DDI_LANES_B,
> >  	POWER_DOMAIN_PORT_DDI_LANES_C,
> >  	POWER_DOMAIN_PORT_CRT,
> > +	POWER_DOMAIN_AUX_IO_B,
> > +	POWER_DOMAIN_AUX_IO_C,
> >  	POWER_DOMAIN_AUX_B,
> >  	POWER_DOMAIN_AUX_C,
> >  	POWER_DOMAIN_INIT);
> > @@ -186,6 +190,8 @@ I915_DECL_PW_DOMAINS(vlv_pwdoms_dpio_cmn_bc,
> >  I915_DECL_PW_DOMAINS(vlv_pwdoms_dpio_tx_bc_lanes,
> >  	POWER_DOMAIN_PORT_DDI_LANES_B,
> >  	POWER_DOMAIN_PORT_DDI_LANES_C,
> > +	POWER_DOMAIN_AUX_IO_B,
> > +	POWER_DOMAIN_AUX_IO_C,
> >  	POWER_DOMAIN_AUX_B,
> >  	POWER_DOMAIN_AUX_C,
> >  	POWER_DOMAIN_INIT);
> > @@ -243,6 +249,9 @@ I915_DECL_PW_DOMAINS(chv_pwdoms_display,
> >  	POWER_DOMAIN_VGA,
> >  	POWER_DOMAIN_AUDIO_MMIO,
> >  	POWER_DOMAIN_AUDIO_PLAYBACK,
> > +	POWER_DOMAIN_AUX_IO_B,
> > +	POWER_DOMAIN_AUX_IO_C,
> > +	POWER_DOMAIN_AUX_IO_D,
> >  	POWER_DOMAIN_AUX_B,
> >  	POWER_DOMAIN_AUX_C,
> >  	POWER_DOMAIN_AUX_D,
> > @@ -252,12 +261,15 @@ I915_DECL_PW_DOMAINS(chv_pwdoms_display,
> >  I915_DECL_PW_DOMAINS(chv_pwdoms_dpio_cmn_bc,
> >  	POWER_DOMAIN_PORT_DDI_LANES_B,
> >  	POWER_DOMAIN_PORT_DDI_LANES_C,
> > +	POWER_DOMAIN_AUX_IO_B,
> > +	POWER_DOMAIN_AUX_IO_C,
> >  	POWER_DOMAIN_AUX_B,
> >  	POWER_DOMAIN_AUX_C,
> >  	POWER_DOMAIN_INIT);
> >  
> >  I915_DECL_PW_DOMAINS(chv_pwdoms_dpio_cmn_d,
> >  	POWER_DOMAIN_PORT_DDI_LANES_D,
> > +	POWER_DOMAIN_AUX_IO_D,
> >  	POWER_DOMAIN_AUX_D,
> >  	POWER_DOMAIN_INIT);
> >  
> > @@ -305,6 +317,9 @@ static const struct i915_power_well_desc_list chv_power_wells[] = {
> >  	POWER_DOMAIN_VGA, \
> >  	POWER_DOMAIN_AUDIO_MMIO, \
> >  	POWER_DOMAIN_AUDIO_PLAYBACK, \
> > +	POWER_DOMAIN_AUX_IO_B, \
> > +	POWER_DOMAIN_AUX_IO_C, \
> > +	POWER_DOMAIN_AUX_IO_D, \
> >  	POWER_DOMAIN_AUX_B, \
> >  	POWER_DOMAIN_AUX_C, \
> >  	POWER_DOMAIN_AUX_D
> > @@ -407,6 +422,8 @@ static const struct i915_power_well_desc_list skl_power_wells[] = {
> >  	POWER_DOMAIN_VGA, \
> >  	POWER_DOMAIN_AUDIO_MMIO, \
> >  	POWER_DOMAIN_AUDIO_PLAYBACK, \
> > +	POWER_DOMAIN_AUX_IO_B, \
> > +	POWER_DOMAIN_AUX_IO_C, \
> >  	POWER_DOMAIN_AUX_B, \
> >  	POWER_DOMAIN_AUX_C
> >  
> > @@ -430,6 +447,8 @@ I915_DECL_PW_DOMAINS(bxt_pwdoms_dpio_cmn_a,
> >  I915_DECL_PW_DOMAINS(bxt_pwdoms_dpio_cmn_bc,
> >  	POWER_DOMAIN_PORT_DDI_LANES_B,
> >  	POWER_DOMAIN_PORT_DDI_LANES_C,
> > +	POWER_DOMAIN_AUX_IO_B,
> > +	POWER_DOMAIN_AUX_IO_C,
> >  	POWER_DOMAIN_AUX_B,
> >  	POWER_DOMAIN_AUX_C,
> >  	POWER_DOMAIN_INIT);
> > @@ -483,6 +502,8 @@ static const struct i915_power_well_desc_list bxt_power_wells[] = {
> >  	POWER_DOMAIN_VGA, \
> >  	POWER_DOMAIN_AUDIO_MMIO, \
> >  	POWER_DOMAIN_AUDIO_PLAYBACK, \
> > +	POWER_DOMAIN_AUX_IO_B, \
> > +	POWER_DOMAIN_AUX_IO_C, \
> >  	POWER_DOMAIN_AUX_B, \
> >  	POWER_DOMAIN_AUX_C
> >  
> > @@ -509,11 +530,13 @@ I915_DECL_PW_DOMAINS(glk_pwdoms_dpio_cmn_a,
> >  
> >  I915_DECL_PW_DOMAINS(glk_pwdoms_dpio_cmn_b,
> >  	POWER_DOMAIN_PORT_DDI_LANES_B,
> > +	POWER_DOMAIN_AUX_IO_B,
> >  	POWER_DOMAIN_AUX_B,
> >  	POWER_DOMAIN_INIT);
> >  
> >  I915_DECL_PW_DOMAINS(glk_pwdoms_dpio_cmn_c,
> >  	POWER_DOMAIN_PORT_DDI_LANES_C,
> > +	POWER_DOMAIN_AUX_IO_C,
> >  	POWER_DOMAIN_AUX_C,
> >  	POWER_DOMAIN_INIT);
> >  
> > @@ -523,10 +546,12 @@ I915_DECL_PW_DOMAINS(glk_pwdoms_aux_a,
> >  	POWER_DOMAIN_INIT);
> >  
> >  I915_DECL_PW_DOMAINS(glk_pwdoms_aux_b,
> > +	POWER_DOMAIN_AUX_IO_B,
> >  	POWER_DOMAIN_AUX_B,
> >  	POWER_DOMAIN_INIT);
> >  
> >  I915_DECL_PW_DOMAINS(glk_pwdoms_aux_c,
> > +	POWER_DOMAIN_AUX_IO_C,
> >  	POWER_DOMAIN_AUX_C,
> >  	POWER_DOMAIN_INIT);
> >  
> > @@ -617,6 +642,11 @@ I915_DECL_PW_DOMAINS(icl_pwdoms_pw_4,
> >  	POWER_DOMAIN_VGA, \
> >  	POWER_DOMAIN_AUDIO_MMIO, \
> >  	POWER_DOMAIN_AUDIO_PLAYBACK, \
> > +	POWER_DOMAIN_AUX_IO_B, \
> > +	POWER_DOMAIN_AUX_IO_C, \
> > +	POWER_DOMAIN_AUX_IO_D, \
> > +	POWER_DOMAIN_AUX_IO_E, \
> > +	POWER_DOMAIN_AUX_IO_F, \
> >  	POWER_DOMAIN_AUX_B, \
> >  	POWER_DOMAIN_AUX_C, \
> >  	POWER_DOMAIN_AUX_D, \
> > @@ -660,11 +690,21 @@ I915_DECL_PW_DOMAINS(icl_pwdoms_ddi_io_f,	POWER_DOMAIN_PORT_DDI_IO_F);
> >  I915_DECL_PW_DOMAINS(icl_pwdoms_aux_a,
> >  	POWER_DOMAIN_AUX_IO_A,
> >  	POWER_DOMAIN_AUX_A);
> > -I915_DECL_PW_DOMAINS(icl_pwdoms_aux_b,		POWER_DOMAIN_AUX_B);
> > -I915_DECL_PW_DOMAINS(icl_pwdoms_aux_c,		POWER_DOMAIN_AUX_C);
> > -I915_DECL_PW_DOMAINS(icl_pwdoms_aux_d,		POWER_DOMAIN_AUX_D);
> > -I915_DECL_PW_DOMAINS(icl_pwdoms_aux_e,		POWER_DOMAIN_AUX_E);
> > -I915_DECL_PW_DOMAINS(icl_pwdoms_aux_f,		POWER_DOMAIN_AUX_F);
> > +I915_DECL_PW_DOMAINS(icl_pwdoms_aux_b,
> > +	POWER_DOMAIN_AUX_IO_B,
> > +	POWER_DOMAIN_AUX_B);
> > +I915_DECL_PW_DOMAINS(icl_pwdoms_aux_c,
> > +	POWER_DOMAIN_AUX_IO_C,
> > +	POWER_DOMAIN_AUX_C);
> > +I915_DECL_PW_DOMAINS(icl_pwdoms_aux_d,
> > +	POWER_DOMAIN_AUX_IO_D,
> > +	POWER_DOMAIN_AUX_D);
> > +I915_DECL_PW_DOMAINS(icl_pwdoms_aux_e,
> > +	POWER_DOMAIN_AUX_IO_E,
> > +	POWER_DOMAIN_AUX_E);
> > +I915_DECL_PW_DOMAINS(icl_pwdoms_aux_f,
> > +	POWER_DOMAIN_AUX_IO_F,
> > +	POWER_DOMAIN_AUX_F);
> >  I915_DECL_PW_DOMAINS(icl_pwdoms_aux_tbt1,	POWER_DOMAIN_AUX_TBT1);
> >  I915_DECL_PW_DOMAINS(icl_pwdoms_aux_tbt2,	POWER_DOMAIN_AUX_TBT2);
> >  I915_DECL_PW_DOMAINS(icl_pwdoms_aux_tbt3,	POWER_DOMAIN_AUX_TBT3);
> > @@ -1215,6 +1255,9 @@ I915_DECL_PW_DOMAINS(xelpd_pwdoms_pw_a,
> >  	POWER_DOMAIN_PORT_DDI_LANES_TC4, \
> >  	POWER_DOMAIN_VGA, \
> >  	POWER_DOMAIN_AUDIO_PLAYBACK, \
> > +	POWER_DOMAIN_AUX_IO_C, \
> > +	POWER_DOMAIN_AUX_IO_D, \
> > +	POWER_DOMAIN_AUX_IO_E, \
> >  	POWER_DOMAIN_AUX_C, \
> >  	POWER_DOMAIN_AUX_D, \
> >  	POWER_DOMAIN_AUX_E, \
> > -- 
> > 2.37.1
> 
> -- 
> Ville Syrjälä
> Intel

-- 
Ville Syrjälä
Intel