On Mon, May 31, 2021 at 10:46:41PM +0200, Anisse Astier wrote: > The ACPI OpRegion Mailbox #5 ASLE extension may contain an EDID to be > used for the embedded display. Add support for using it via by adding > the EDID to the list of available modes on the connector, and use it for > eDP when available. > > If a panel's EDID is broken, there may be an override EDID set in the > ACPI OpRegion mailbox #5. Use it if available.
Looks like Windows uses the ACPI _DDC method instead. We should probably do the same, just in case some crazy machine stores the EDID somewhere else. > > Fixes the GPD Win Max display. > > Based on original patch series by: Jani Nikula <jani.nik...@intel.com> > https://patchwork.kernel.org/project/intel-gfx/patch/20200828061941.17051-1-jani.nik...@intel.com/ > > Changes: > - EDID is copied and validated with drm_edid_is_valid > - Mode is now added via drm_add_edid_modes instead of using override > mechanism > - squashed the two patches > > Cc: Jani Nikula <jani.nik...@intel.com> > Cc: Uma Shankar <uma.shan...@intel.com> > Cc: Ville Syrjälä <ville.syrj...@linux.intel.com> > Signed-off-by: Anisse Astier <ani...@astier.eu> > --- > drivers/gpu/drm/i915/display/intel_dp.c | 3 + > drivers/gpu/drm/i915/display/intel_opregion.c | 69 ++++++++++++++++++- > drivers/gpu/drm/i915/display/intel_opregion.h | 8 +++ > 3 files changed, 79 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c > b/drivers/gpu/drm/i915/display/intel_dp.c > index 5c9222283044..43fb485c0e02 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -5191,6 +5191,9 @@ static bool intel_edp_init_connector(struct intel_dp > *intel_dp, > goto out_vdd_off; > } > > + /* Set up override EDID, if any, from ACPI OpRegion */ > + intel_opregion_edid_probe(intel_connector); > + > mutex_lock(&dev->mode_config.mutex); > edid = drm_get_edid(connector, &intel_dp->aux.ddc); > if (edid) { > diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c > b/drivers/gpu/drm/i915/display/intel_opregion.c > index dfd724e506b5..ef8d38f041eb 100644 > --- a/drivers/gpu/drm/i915/display/intel_opregion.c > +++ b/drivers/gpu/drm/i915/display/intel_opregion.c > @@ -196,6 +196,8 @@ struct opregion_asle_ext { > #define ASLE_IUER_WINDOWS_BTN (1 << 1) > #define ASLE_IUER_POWER_BTN (1 << 0) > > +#define ASLE_PHED_EDID_VALID_MASK 0x3 > + > /* Software System Control Interrupt (SWSCI) */ > #define SWSCI_SCIC_INDICATOR (1 << 0) > #define SWSCI_SCIC_MAIN_FUNCTION_SHIFT 1 > @@ -909,8 +911,10 @@ int intel_opregion_setup(struct drm_i915_private > *dev_priv) > opregion->asle->ardy = ASLE_ARDY_NOT_READY; > } > > - if (mboxes & MBOX_ASLE_EXT) > + if (mboxes & MBOX_ASLE_EXT) { > drm_dbg(&dev_priv->drm, "ASLE extension supported\n"); > + opregion->asle_ext = base + OPREGION_ASLE_EXT_OFFSET; > + } > > if (intel_load_vbt_firmware(dev_priv) == 0) > goto out; > @@ -1037,6 +1041,68 @@ intel_opregion_get_panel_type(struct drm_i915_private > *dev_priv) > return ret - 1; > } > > +/** > + * intel_opregion_edid_probe - Add EDID from ACPI OpRegion mailbox #5 > + * @intel_connector: eDP connector > + * > + * This reads the ACPI Opregion mailbox #5 to extract the EDID that is passed > + * to it. > + * > + * Will take a lock on the DRM mode_config to add the EDID; make sure it > isn't > + * called with lock taken. > + * > + */ > +void intel_opregion_edid_probe(struct intel_connector *intel_connector) > +{ > + struct drm_connector *connector = &intel_connector->base; > + struct drm_i915_private *i915 = to_i915(connector->dev); > + struct intel_opregion *opregion = &i915->opregion; > + const void *in_edid; > + const struct edid *edid; > + struct edid *new_edid; > + int len, ret, num; > + > + if (!opregion->asle_ext || connector->override_edid) > + return; > + > + in_edid = opregion->asle_ext->bddc; > + > + /* Validity corresponds to number of 128-byte blocks */ > + len = (opregion->asle_ext->phed & ASLE_PHED_EDID_VALID_MASK) * 128; > + if (!len || !memchr_inv(in_edid, 0, len)) > + return; > + > + edid = in_edid; > + > + if (len < EDID_LENGTH * (1 + edid->extensions)) { > + drm_dbg_kms(&i915->drm, "Invalid EDID in ACPI OpRegion (Mailbox > #5)\n"); > + return; > + } > + new_edid = drm_edid_duplicate(edid); > + if (!new_edid) { > + drm_err(&i915->drm, "Cannot duplicate EDID\n"); > + return; > + } > + if (!drm_edid_is_valid(new_edid)) { > + kfree(new_edid); > + drm_dbg_kms(&i915->drm, "Cannot validate EDID in ACPI OpRegion > (Mailbox #5)\n"); > + return; > + } > + > + ret = drm_connector_update_edid_property(connector, new_edid); > + if (ret) { > + kfree(new_edid); > + return; > + } > + > + mutex_lock(&connector->dev->mode_config.mutex); > + num = drm_add_edid_modes(connector, new_edid); > + mutex_unlock(&connector->dev->mode_config.mutex); > + > + drm_dbg_kms(&i915->drm, "Using OpRegion EDID for [CONNECTOR:%d:%s], > added %d mode(s)\n", > + connector->base.id, connector->name, num); > +} > + > void intel_opregion_register(struct drm_i915_private *i915) > { > struct intel_opregion *opregion = &i915->opregion; > @@ -1127,6 +1193,7 @@ void intel_opregion_unregister(struct drm_i915_private > *i915) > opregion->acpi = NULL; > opregion->swsci = NULL; > opregion->asle = NULL; > + opregion->asle_ext = NULL; > opregion->vbt = NULL; > opregion->lid_state = NULL; > } > diff --git a/drivers/gpu/drm/i915/display/intel_opregion.h > b/drivers/gpu/drm/i915/display/intel_opregion.h > index 4aa68ffbd30e..c1ecfcbb6f55 100644 > --- a/drivers/gpu/drm/i915/display/intel_opregion.h > +++ b/drivers/gpu/drm/i915/display/intel_opregion.h > @@ -29,12 +29,14 @@ > #include <linux/pci.h> > > struct drm_i915_private; > +struct intel_connector; > struct intel_encoder; > > struct opregion_header; > struct opregion_acpi; > struct opregion_swsci; > struct opregion_asle; > +struct opregion_asle_ext; > > struct intel_opregion { > struct opregion_header *header; > @@ -43,6 +45,7 @@ struct intel_opregion { > u32 swsci_gbda_sub_functions; > u32 swsci_sbcb_sub_functions; > struct opregion_asle *asle; > + struct opregion_asle_ext *asle_ext; > void *rvda; > void *vbt_firmware; > const void *vbt; > @@ -71,6 +74,7 @@ int intel_opregion_notify_encoder(struct intel_encoder > *intel_encoder, > int intel_opregion_notify_adapter(struct drm_i915_private *dev_priv, > pci_power_t state); > int intel_opregion_get_panel_type(struct drm_i915_private *dev_priv); > +void intel_opregion_edid_probe(struct intel_connector *connector); > > #else /* CONFIG_ACPI*/ > > @@ -117,6 +121,10 @@ static inline int intel_opregion_get_panel_type(struct > drm_i915_private *dev) > return -ENODEV; > } > > +void intel_opregion_edid_probe(struct intel_connector *connector) > +{ > +} > + > #endif /* CONFIG_ACPI */ > > #endif > -- > 2.31.1 -- Ville Syrjälä Intel
