Re: [PATCH 10/23] drm/i915/mtl: Add display power wells

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On Mon, Aug 01, 2022 at 06:23:39PM -0700, Matt Roper wrote:
> On Wed, Jul 27, 2022 at 06:34:07PM -0700, Radhakrishna Sripada wrote:
> > From: Imre Deak <imre.deak@xxxxxxxxx>
> > 
> > Add support for display power wells on MTL. The differences from D13:

Also, this should be "...from Xe_LPD"


Matt

> > - The AUX HW block is moved to the PICA block, where the registers are on
> >   an always-on power well and the functionality needs to be powered on/off
> >   via the AUX_CH_CTL register: [1], [2]
> > - The DDI IO power on/off programming sequence is moved to the PHY PLL
> >   enable/disable sequence. [3], [4], [5]
> > 
> > Bspec: [1] 49233, [2] 65247, [3] 64568, [4] 65451, [5] 65450
> > 
> > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> > ---
> >  .../i915/display/intel_display_power_map.c    | 115 +++++++++++++++++-
> >  .../i915/display/intel_display_power_well.c   |  43 +++++++
> >  .../i915/display/intel_display_power_well.h   |   4 +
> >  drivers/gpu/drm/i915/display/intel_dp_aux.c   |   8 ++
> >  drivers/gpu/drm/i915/i915_reg.h               |  30 +++++
> >  5 files changed, 199 insertions(+), 1 deletion(-)
> > 
> > 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 97b367f39f35..cd28976f8076 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power_map.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power_map.c
> > @@ -1350,6 +1350,117 @@ static const struct i915_power_well_desc_list xelpd_power_wells[] = {
> >  	I915_PW_DESCRIPTORS(xelpd_power_wells_main),
> >  };
> >  
> > +/*
> > + * MTL is based on XELPD power domains with the exception of power gating for:
> > + * - DDI_IO (moved to PLL logic)
> > + * - AUX and AUX_IO functionality and register access for USBC1-4 (PICA always-on)
> > + */
> > +#define XELPDP_PW_2_POWER_DOMAINS \
> > +	XELPD_PW_B_POWER_DOMAINS, \
> > +	XELPD_PW_C_POWER_DOMAINS, \
> > +	XELPD_PW_D_POWER_DOMAINS, \
> > +	POWER_DOMAIN_AUDIO_PLAYBACK, \
> > +	POWER_DOMAIN_VGA, \
> > +	POWER_DOMAIN_PORT_DDI_LANES_TC1, \
> > +	POWER_DOMAIN_PORT_DDI_LANES_TC2, \
> > +	POWER_DOMAIN_PORT_DDI_LANES_TC3, \
> > +	POWER_DOMAIN_PORT_DDI_LANES_TC4
> > +
> > +I915_DECL_PW_DOMAINS(xelpdp_pwdoms_pw_2,
> > +	XELPDP_PW_2_POWER_DOMAINS,
> > +	POWER_DOMAIN_INIT);
> > +
> > +I915_DECL_PW_DOMAINS(xelpdp_pwdoms_dc_off,
> > +	XELPDP_PW_2_POWER_DOMAINS,
> > +	POWER_DOMAIN_AUDIO_MMIO,
> > +	POWER_DOMAIN_MODESET,
> > +	POWER_DOMAIN_AUX_A,
> > +	POWER_DOMAIN_AUX_B,
> > +	POWER_DOMAIN_INIT);
> > +
> > +I915_DECL_PW_DOMAINS(xelpdp_pwdoms_aux_tc1,
> > +	POWER_DOMAIN_AUX_USBC1,
> > +	POWER_DOMAIN_AUX_TBT1);
> > +
> > +I915_DECL_PW_DOMAINS(xelpdp_pwdoms_aux_tc2,
> > +	POWER_DOMAIN_AUX_USBC2,
> > +	POWER_DOMAIN_AUX_TBT2);
> > +
> > +I915_DECL_PW_DOMAINS(xelpdp_pwdoms_aux_tc3,
> > +	POWER_DOMAIN_AUX_USBC3,
> > +	POWER_DOMAIN_AUX_TBT3);
> > +
> > +I915_DECL_PW_DOMAINS(xelpdp_pwdoms_aux_tc4,
> > +	POWER_DOMAIN_AUX_USBC4,
> > +	POWER_DOMAIN_AUX_TBT4);
> > +
> > +static const struct i915_power_well_desc xelpdp_power_wells_main[] = {
> > +	{
> > +		.instances = &I915_PW_INSTANCES(
> > +			I915_PW("DC_off", &xelpdp_pwdoms_dc_off,
> > +				.id = SKL_DISP_DC_OFF),
> > +		),
> > +		.ops = &gen9_dc_off_power_well_ops,
> > +	}, {
> > +		.instances = &I915_PW_INSTANCES(
> > +			I915_PW("PW_2", &xelpdp_pwdoms_pw_2,
> > +				.hsw.idx = ICL_PW_CTL_IDX_PW_2,
> > +				.id = SKL_DISP_PW_2),
> > +		),
> > +		.ops = &hsw_power_well_ops,
> > +		.has_vga = true,
> > +		.has_fuses = true,
> > +	}, {
> > +		.instances = &I915_PW_INSTANCES(
> > +			I915_PW("PW_A", &xelpd_pwdoms_pw_a,
> > +				.hsw.idx = XELPD_PW_CTL_IDX_PW_A),
> > +		),
> > +		.ops = &hsw_power_well_ops,
> > +		.irq_pipe_mask = BIT(PIPE_A),
> > +		.has_fuses = true,
> > +	}, {
> > +		.instances = &I915_PW_INSTANCES(
> > +			I915_PW("PW_B", &xelpd_pwdoms_pw_b,
> > +				.hsw.idx = XELPD_PW_CTL_IDX_PW_B),
> > +		),
> > +		.ops = &hsw_power_well_ops,
> > +		.irq_pipe_mask = BIT(PIPE_B),
> > +		.has_fuses = true,
> > +	}, {
> > +		.instances = &I915_PW_INSTANCES(
> > +			I915_PW("PW_C", &xelpd_pwdoms_pw_c,
> > +				.hsw.idx = XELPD_PW_CTL_IDX_PW_C),
> > +		),
> > +		.ops = &hsw_power_well_ops,
> > +		.irq_pipe_mask = BIT(PIPE_C),
> > +		.has_fuses = true,
> > +	}, {
> > +		.instances = &I915_PW_INSTANCES(
> > +			I915_PW("PW_D", &xelpd_pwdoms_pw_d,
> > +				.hsw.idx = XELPD_PW_CTL_IDX_PW_D),
> > +		),
> > +		.ops = &hsw_power_well_ops,
> > +		.irq_pipe_mask = BIT(PIPE_D),
> > +		.has_fuses = true,
> > +	}, {
> > +		.instances = &I915_PW_INSTANCES(
> > +			I915_PW("AUX_A", &icl_pwdoms_aux_a, .xelpdp.aux_ch = AUX_CH_A),
> > +			I915_PW("AUX_B", &icl_pwdoms_aux_b, .xelpdp.aux_ch = AUX_CH_B),
> > +			I915_PW("AUX_TC1", &xelpdp_pwdoms_aux_tc1, .xelpdp.aux_ch = AUX_CH_USBC1),
> > +			I915_PW("AUX_TC2", &xelpdp_pwdoms_aux_tc2, .xelpdp.aux_ch = AUX_CH_USBC2),
> > +			I915_PW("AUX_TC3", &xelpdp_pwdoms_aux_tc3, .xelpdp.aux_ch = AUX_CH_USBC3),
> > +			I915_PW("AUX_TC4", &xelpdp_pwdoms_aux_tc4, .xelpdp.aux_ch = AUX_CH_USBC4),
> > +		),
> > +		.ops = &xelpdp_aux_power_well_ops,
> > +	},
> > +};
> > +
> > +static const struct i915_power_well_desc_list xelpdp_power_wells[] = {
> > +	I915_PW_DESCRIPTORS(i9xx_power_wells_always_on),
> > +	I915_PW_DESCRIPTORS(icl_power_wells_pw_1),
> > +	I915_PW_DESCRIPTORS(xelpdp_power_wells_main),
> > +};
> > +
> >  static void init_power_well_domains(const struct i915_power_well_instance *inst,
> >  				    struct i915_power_well *power_well)
> >  {
> > @@ -1457,7 +1568,9 @@ int intel_display_power_map_init(struct i915_power_domains *power_domains)
> >  		return 0;
> >  	}
> >  
> > -	if (DISPLAY_VER(i915) >= 13)
> > +	if (DISPLAY_VER(i915) >= 14)
> > +		return set_power_wells(power_domains, xelpdp_power_wells);
> > +	else if (DISPLAY_VER(i915) >= 13)
> >  		return set_power_wells(power_domains, xelpd_power_wells);
> >  	else if (IS_DG1(i915))
> >  		return set_power_wells(power_domains, dg1_power_wells);
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.c b/drivers/gpu/drm/i915/display/intel_display_power_well.c
> > index 91cfd5890f46..7c854c1a110b 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
> > @@ -1797,6 +1797,42 @@ tgl_tc_cold_off_power_well_is_enabled(struct drm_i915_private *dev_priv,
> >  	return intel_power_well_refcount(power_well);
> >  }
> >  
> > +static void xelpdp_aux_power_well_sync_hw(struct drm_i915_private *i915,
> > +					  struct i915_power_well *power_well)
> > +{
> > +}
> 
> We can just use i9xx_power_well_sync_hw_noop instead of creating another
> empty function.
> 
> > +
> > +static void xelpdp_aux_power_well_enable(struct drm_i915_private *dev_priv,
> > +					 struct i915_power_well *power_well)
> > +{
> > +	enum aux_ch aux_ch = i915_power_well_instance(power_well)->xelpdp.aux_ch;
> > +
> > +	intel_de_rmw(dev_priv, XELPDP_DP_AUX_CH_CTL(aux_ch),
> > +		     XELPDP_DP_AUX_CH_CTL_POWER_REQUEST,
> > +		     XELPDP_DP_AUX_CH_CTL_POWER_REQUEST);
> > +	/* The power status flag doesn't indicate that the power up completed. */
> 
> This comment isn't super clear by itself.  Maybe something like
> 
>         /*
>          * The power status flag cannot be used to determine whether aux
>          * power wells have finished powering up.  Instead we're
>          * expected to just wait a fixed 600us after raising the request
>          * bit.
>          */
> 
> would be more clear.
> 
> > +	usleep_range(600, 1200);
> > +}
> > +
> > +static void xelpdp_aux_power_well_disable(struct drm_i915_private *dev_priv,
> > +					  struct i915_power_well *power_well)
> > +{
> > +	enum aux_ch aux_ch = i915_power_well_instance(power_well)->xelpdp.aux_ch;
> > +
> > +	intel_de_rmw(dev_priv, XELPDP_DP_AUX_CH_CTL(aux_ch),
> > +		     XELPDP_DP_AUX_CH_CTL_POWER_REQUEST,
> > +		     0);
> > +	usleep_range(10, 30);
> > +}
> > +
> > +static bool xelpdp_aux_power_well_enabled(struct drm_i915_private *dev_priv,
> > +					  struct i915_power_well *power_well)
> > +{
> > +	enum aux_ch aux_ch = i915_power_well_instance(power_well)->xelpdp.aux_ch;
> > +
> > +	return intel_de_read(dev_priv, XELPDP_DP_AUX_CH_CTL(aux_ch)) &
> > +		XELPDP_DP_AUX_CH_CTL_POWER_STATUS;
> > +}
> >  
> >  const struct i915_power_well_ops i9xx_always_on_power_well_ops = {
> >  	.sync_hw = i9xx_power_well_sync_hw_noop,
> > @@ -1910,3 +1946,10 @@ const struct i915_power_well_ops tgl_tc_cold_off_ops = {
> >  	.disable = tgl_tc_cold_off_power_well_disable,
> >  	.is_enabled = tgl_tc_cold_off_power_well_is_enabled,
> >  };
> > +
> > +const struct i915_power_well_ops xelpdp_aux_power_well_ops = {
> > +	.sync_hw = xelpdp_aux_power_well_sync_hw,
> > +	.enable = xelpdp_aux_power_well_enable,
> > +	.disable = xelpdp_aux_power_well_disable,
> > +	.is_enabled = xelpdp_aux_power_well_enabled,
> > +};
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.h b/drivers/gpu/drm/i915/display/intel_display_power_well.h
> > index d0624642dcb6..03d11576327d 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power_well.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power_well.h
> > @@ -80,6 +80,9 @@ struct i915_power_well_instance {
> >  			 */
> >  			u8 idx;
> >  		} hsw;
> > +		struct {
> > +			u8 aux_ch;
> > +		} xelpdp;
> >  	};
> >  };
> >  
> > @@ -169,5 +172,6 @@ extern const struct i915_power_well_ops vlv_dpio_power_well_ops;
> >  extern const struct i915_power_well_ops icl_aux_power_well_ops;
> >  extern const struct i915_power_well_ops icl_ddi_power_well_ops;
> >  extern const struct i915_power_well_ops tgl_tc_cold_off_ops;
> > +extern const struct i915_power_well_ops xelpdp_aux_power_well_ops;
> >  
> >  #endif
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
> > index 2bc119374555..40c4bdd9cb26 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
> > @@ -150,6 +150,7 @@ static u32 skl_get_aux_send_ctl(struct intel_dp *intel_dp,
> >  				u32 unused)
> >  {
> >  	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > +	struct drm_i915_private *i915 =	to_i915(dig_port->base.base.dev);
> >  	u32 ret;
> >  
> >  	/*
> > @@ -170,6 +171,13 @@ static u32 skl_get_aux_send_ctl(struct intel_dp *intel_dp,
> >  	if (intel_tc_port_in_tbt_alt_mode(dig_port))
> >  		ret |= DP_AUX_CH_CTL_TBT_IO;
> >  
> > +	/*
> > +	 * Power request bit is already set during aux power well enable.
> > +	 * Preserve the bit across aux transactions.
> > +	 */
> > +	if (DISPLAY_VER(i915) >= 14)
> > +		ret |= XELPDP_DP_AUX_CH_CTL_POWER_REQUEST;
> > +
> >  	return ret;
> >  }
> >  
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index baf747adf1db..6087d40eed70 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -3619,6 +3619,34 @@
> >  #define DP_AUX_CH_CTL(aux_ch)	_MMIO_PORT(aux_ch, _DPA_AUX_CH_CTL, _DPB_AUX_CH_CTL)
> >  #define DP_AUX_CH_DATA(aux_ch, i)	_MMIO(_PORT(aux_ch, _DPA_AUX_CH_DATA1, _DPB_AUX_CH_DATA1) + (i) * 4) /* 5 registers */
> >  
> > +#define _XELPDP_USBC1_AUX_CH_CTL	0x16F210
> > +#define _XELPDP_USBC2_AUX_CH_CTL	0x16F410
> > +#define _XELPDP_USBC3_AUX_CH_CTL	0x16F610
> > +#define _XELPDP_USBC4_AUX_CH_CTL	0x16F810
> > +
> > +#define _XELPDP_USBC1_AUX_CH_DATA1	0x16F214
> > +#define _XELPDP_USBC2_AUX_CH_DATA1	0x16F414
> > +#define _XELPDP_USBC3_AUX_CH_DATA1	0x16F614
> > +#define _XELPDP_USBC4_AUX_CH_DATA1	0x16F814
> > +
> > +#define XELPDP_DP_AUX_CH_CTL(aux_ch)		_MMIO(_PICK(aux_ch, \
> > +						       _DPA_AUX_CH_CTL, \
> > +						       _DPB_AUX_CH_CTL, \
> > +						       0, /* port/aux_ch C is non-existent */ \
> > +						       _XELPDP_USBC1_AUX_CH_CTL, \
> > +						       _XELPDP_USBC2_AUX_CH_CTL, \
> > +						       _XELPDP_USBC3_AUX_CH_CTL, \
> > +						       _XELPDP_USBC4_AUX_CH_CTL))
> > +
> > +#define XELPDP_DP_AUX_CH_DATA(aux_ch, i)	_MMIO(_PICK(aux_ch, \
> > +						       _DPA_AUX_CH_DATA1, \
> > +						       _DPB_AUX_CH_DATA1, \
> > +						       0, /* port/aux_ch C is non-existent */ \
> > +						       _XELPDP_USBC1_AUX_CH_DATA1, \
> > +						       _XELPDP_USBC2_AUX_CH_DATA1, \
> > +						       _XELPDP_USBC3_AUX_CH_DATA1, \
> > +						       _XELPDP_USBC4_AUX_CH_DATA1) + (i) * 4)
> > +
> >  #define   DP_AUX_CH_CTL_SEND_BUSY	    (1 << 31)
> >  #define   DP_AUX_CH_CTL_DONE		    (1 << 30)
> >  #define   DP_AUX_CH_CTL_INTERRUPT	    (1 << 29)
> > @@ -3631,6 +3659,8 @@
> >  #define   DP_AUX_CH_CTL_RECEIVE_ERROR	    (1 << 25)
> >  #define   DP_AUX_CH_CTL_MESSAGE_SIZE_MASK    (0x1f << 20)
> >  #define   DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT   20
> > +#define   XELPDP_DP_AUX_CH_CTL_POWER_REQUEST (1 << 19)
> > +#define   XELPDP_DP_AUX_CH_CTL_POWER_STATUS  (1 << 18)
> 
> We should probably start using REG_BIT() for the new bits at least.
> 
> 
> Matt
> 
> >  #define   DP_AUX_CH_CTL_PRECHARGE_2US_MASK   (0xf << 16)
> >  #define   DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT  16
> >  #define   DP_AUX_CH_CTL_AUX_AKSV_SELECT	    (1 << 15)
> > -- 
> > 2.25.1
> > 
> 
> -- 
> Matt Roper
> Graphics Software Engineer
> VTT-OSGC Platform Enablement
> Intel Corporation

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation



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