[Intel-gfx] [PATCH 10/23] drm/i915/mtl: Add display power wells
Matt Roper
matthew.d.roper at intel.com
Tue Aug 2 01:23:36 UTC 2022
On Wed, Jul 27, 2022 at 06:34:07PM -0700, Radhakrishna Sripada wrote:
> From: Imre Deak <imre.deak at intel.com>
>
> Add support for display power wells on MTL. The differences from D13:
> - 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 at intel.com>
> ---
> .../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
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