Re: [PATCH v4 06/11] drm/i915/mtl: Add display power wells

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On Thu, Sep 01, 2022 at 11:03:37PM -0700, Radhakrishna Sripada wrote:
> From: Imre Deak <imre.deak@xxxxxxxxx>
> 
> Add support for display power wells on MTL. The differences from XE_LPD:
> - 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
> 
> v2:
>  - Update the comment in aux power well enable
>  - Reuse the noop sync fn for aux sync.
>  - Use REG_BIT for new register bit definitions
> 
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>

Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>

> ---
>  .../i915/display/intel_display_power_map.c    | 115 +++++++++++++++++-
>  .../i915/display/intel_display_power_well.c   |  44 +++++++
>  .../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               |  21 ++++
>  5 files changed, 191 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 5ddd1b93751c..dc04afc6cc8f 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 29cc05c04c65..9bf98a37204b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
> @@ -1798,6 +1798,43 @@ 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_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 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.
> +	 */
> +	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,
> @@ -1911,3 +1948,10 @@ 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 = i9xx_power_well_sync_hw_noop,
> +	.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 31a898176ebb..e13b521e322a 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 f2ad1d09ab43..98bd33645b43 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 e02e461a4b5d..99b2cd2abca4 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -3451,6 +3451,25 @@
>  #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   DP_AUX_CH_CTL_SEND_BUSY	    (1 << 31)
>  #define   DP_AUX_CH_CTL_DONE		    (1 << 30)
>  #define   DP_AUX_CH_CTL_INTERRUPT	    (1 << 29)
> @@ -3463,6 +3482,8 @@
>  #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 REG_BIT(19)
> +#define   XELPDP_DP_AUX_CH_CTL_POWER_STATUS  REG_BIT(18)
>  #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)
> -- 
> 2.34.1
> 

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



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