[Intel-xe] [Intel-gfx] [PATCH v3 16/29] drm/i915/xe2lpd: Add display power well
Matt Roper
matthew.d.roper at intel.com
Tue Sep 12 16:04:17 UTC 2023
On Mon, Sep 11, 2023 at 09:48:24PM -0700, Lucas De Marchi wrote:
> From: Ravi Kumar Vodapalli <ravi.kumar.vodapalli at intel.com>
>
> Add Display Power Well for LNL platform. It's mostly the same as MTL
It might be better to say "Xe2_LPD" and "Xe_LPD+" instead of LNL/MTL?
> platform so reuse the code. PGPICA1 contains type-C capable port slices
> which requires the well to power powered up, so add new power well
> definition for it.
Maybe add a sentence noting that the dc_off fake powerwell will be added
in a follow-up patch so that people don't think it was overlooked here?
>
> BSpec: 68886
> Signed-off-by: Ravi Kumar Vodapalli <ravi.kumar.vodapalli at intel.com>
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
> .../i915/display/intel_display_power_map.c | 36 ++++++++++++++-
> .../i915/display/intel_display_power_well.c | 44 +++++++++++++++++++
> .../i915/display/intel_display_power_well.h | 1 +
> .../gpu/drm/i915/display/intel_dp_aux_regs.h | 5 +++
> 4 files changed, 85 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 0f1b93d139ca..31c11586ede5 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power_map.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power_map.c
> @@ -1536,6 +1536,38 @@ static const struct i915_power_well_desc_list xelpdp_power_wells[] = {
> I915_PW_DESCRIPTORS(xelpdp_power_wells_main),
> };
>
> +I915_DECL_PW_DOMAINS(xe2lpd_pwdoms_pica_tc,
> + POWER_DOMAIN_PORT_DDI_LANES_TC1,
> + POWER_DOMAIN_PORT_DDI_LANES_TC2,
> + POWER_DOMAIN_PORT_DDI_LANES_TC3,
> + POWER_DOMAIN_PORT_DDI_LANES_TC4,
> + POWER_DOMAIN_AUX_USBC1,
> + POWER_DOMAIN_AUX_USBC2,
> + POWER_DOMAIN_AUX_USBC3,
> + POWER_DOMAIN_AUX_USBC4,
> + POWER_DOMAIN_AUX_TBT1,
> + POWER_DOMAIN_AUX_TBT2,
> + POWER_DOMAIN_AUX_TBT3,
> + POWER_DOMAIN_AUX_TBT4,
> + POWER_DOMAIN_INIT);
> +
> +static const struct i915_power_well_desc xe2lpd_power_wells_pica[] = {
> + {
> + .instances = &I915_PW_INSTANCES(I915_PW("PICA_TC",
> + &xe2lpd_pwdoms_pica_tc,
> + .id = DISP_PW_ID_NONE),
> + ),
> + .ops = &xe2lpd_pica_power_well_ops,
> + },
> +};
> +
> +static const struct i915_power_well_desc_list xe2lpd_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),
> + I915_PW_DESCRIPTORS(xe2lpd_power_wells_pica),
> +};
> +
> static void init_power_well_domains(const struct i915_power_well_instance *inst,
> struct i915_power_well *power_well)
> {
> @@ -1643,7 +1675,9 @@ int intel_display_power_map_init(struct i915_power_domains *power_domains)
> return 0;
> }
>
> - if (DISPLAY_VER(i915) >= 14)
> + if (DISPLAY_VER(i915) >= 20)
> + return set_power_wells(power_domains, xe2lpd_power_wells);
> + else if (DISPLAY_VER(i915) >= 14)
> return set_power_wells(power_domains, xelpdp_power_wells);
> else if (IS_DG2(i915))
> return set_power_wells(power_domains, xehpd_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 ca0714eba17a..adfe9901bde4 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
> @@ -1833,6 +1833,43 @@ static bool xelpdp_aux_power_well_enabled(struct drm_i915_private *dev_priv,
> XELPDP_DP_AUX_CH_CTL_POWER_STATUS;
> }
>
> +static void xe2lpd_pica_power_well_enable(struct drm_i915_private *dev_priv,
> + struct i915_power_well *power_well)
> +{
> + intel_de_rmw(dev_priv, XE2LPD_PICA_PW_CTL,
> + XE2LPD_PICA_CTL_POWER_REQUEST,
> + XE2LPD_PICA_CTL_POWER_REQUEST);
Do we need rmw here? Bit 31 is the only writable bit in the register
(bit 30 is RO and can't be clobbered), so a simple write should suffice?
Ditto on the disable below.
> +
> + if (intel_de_wait_for_set(dev_priv, XE2LPD_PICA_PW_CTL,
> + XE2LPD_PICA_CTL_POWER_STATUS, 1)) {
> + drm_dbg_kms(&dev_priv->drm, "pica power well enable timeout\n");
> +
> + drm_WARN(&dev_priv->drm, 1, "Power well PICA timeout when enabled");
> + }
> +}
> +
> +static void xe2lpd_pica_power_well_disable(struct drm_i915_private *dev_priv,
> + struct i915_power_well *power_well)
> +{
> + intel_de_rmw(dev_priv, XE2LPD_PICA_PW_CTL,
> + XE2LPD_PICA_CTL_POWER_REQUEST,
> + 0);
> +
> + if (intel_de_wait_for_clear(dev_priv, XE2LPD_PICA_PW_CTL,
> + XE2LPD_PICA_CTL_POWER_STATUS, 1)) {
> + drm_dbg_kms(&dev_priv->drm, "pica power well disable timeout\n");
> +
> + drm_WARN(&dev_priv->drm, 1, "Power well PICA timeout when disabled");
> + }
> +}
> +
> +static bool xe2lpd_pica_power_well_enabled(struct drm_i915_private *dev_priv,
> + struct i915_power_well *power_well)
> +{
> + return intel_de_read(dev_priv, XE2LPD_PICA_PW_CTL) &
> + XE2LPD_PICA_CTL_POWER_STATUS;
> +}
> +
> const struct i915_power_well_ops i9xx_always_on_power_well_ops = {
> .sync_hw = i9xx_power_well_sync_hw_noop,
> .enable = i9xx_always_on_power_well_noop,
> @@ -1952,3 +1989,10 @@ const struct i915_power_well_ops xelpdp_aux_power_well_ops = {
> .disable = xelpdp_aux_power_well_disable,
> .is_enabled = xelpdp_aux_power_well_enabled,
> };
> +
> +const struct i915_power_well_ops xe2lpd_pica_power_well_ops = {
> + .sync_hw = i9xx_power_well_sync_hw_noop,
> + .enable = xe2lpd_pica_power_well_enable,
> + .disable = xe2lpd_pica_power_well_disable,
> + .is_enabled = xe2lpd_pica_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 a8736588314d..9357a9a73c06 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power_well.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_power_well.h
> @@ -176,5 +176,6 @@ 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;
> +extern const struct i915_power_well_ops xe2lpd_pica_power_well_ops;
>
> #endif
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_regs.h b/drivers/gpu/drm/i915/display/intel_dp_aux_regs.h
> index b4e96baae25a..c869f5661530 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_regs.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_regs.h
> @@ -86,4 +86,9 @@
> _XELPDP_DP_AUX_CH_DATA(__xe2lpd_aux_ch_idx(aux_ch), i) : \
> _XELPDP_DP_AUX_CH_DATA(aux_ch, i))
>
> +/* PICA Power Well Control */
> +#define XE2LPD_PICA_PW_CTL _MMIO(0x16fe04)
Is this the right header for this? It doesn't seem directly related to
DP AUX.
Matt
> +#define XE2LPD_PICA_CTL_POWER_REQUEST REG_BIT(31)
> +#define XE2LPD_PICA_CTL_POWER_STATUS REG_BIT(30)
> +
> #endif /* __INTEL_DP_AUX_REGS_H__ */
> --
> 2.40.1
>
--
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation
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