On Fri, Jun 4, 2021 at 11:57 PM Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> wrote: > > On Thu, May 20, 2021 at 2:58 PM Kai-Heng Feng > <kai.heng.feng@xxxxxxxxxxxxx> wrote: > > > > On HP Fury G7 Workstations, graphics output is re-routed from Intel GFX > > to discrete GFX after S3. This is not desirable, because userspace will > > treat connected display as a new one, losing display settings. > > > > The expected behavior is to let discrete GFX drives all external > > displays. > > > > The platform in question uses ACPI method \_SB.PCI0.HGME to enable MUX. > > The method is inside the another _DSM, so add the _DSM and call it > > accordingly. > > > > I also tested some MUX-less and iGPU only laptops with that _DSM, no > > regression was found. > > > > v4: > > - Rebase. > > - Change the DSM name to avoid confusion. > > - Move the function call to intel_opregion. > > > > v3: > > - Remove BXT from names. > > - Change the parameter type. > > - Fold the function into intel_modeset_init_hw(). > > > > v2: > > - Forward declare struct pci_dev. > > > > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3113 > > References: https://lore.kernel.org/intel-gfx/1460040732-31417-4-git-send-email-animesh.manna@xxxxxxxxx/ > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> > > A gentle ping... Another gentle ping... > > > --- > > drivers/gpu/drm/i915/display/intel_acpi.c | 19 +++++++++++++++++++ > > drivers/gpu/drm/i915/display/intel_acpi.h | 3 +++ > > drivers/gpu/drm/i915/display/intel_opregion.c | 3 +++ > > 3 files changed, 25 insertions(+) > > > > diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c > > index 833d0c1be4f1..7cfe91fc05f2 100644 > > --- a/drivers/gpu/drm/i915/display/intel_acpi.c > > +++ b/drivers/gpu/drm/i915/display/intel_acpi.c > > @@ -19,6 +19,12 @@ static const guid_t intel_dsm_guid = > > GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f, > > 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c); > > > > +#define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */ > > + > > +static const guid_t intel_dsm_guid2 = > > + GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260, > > + 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14); > > + > > static char *intel_dsm_port_name(u8 id) > > { > > switch (id) { > > @@ -176,6 +182,19 @@ void intel_unregister_dsm_handler(void) > > { > > } > > > > +void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915) > > +{ > > + struct pci_dev *pdev = to_pci_dev(i915->drm.dev); > > + acpi_handle dhandle; > > + > > + dhandle = ACPI_HANDLE(&pdev->dev); > > + if (!dhandle) > > + return; > > + > > + acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID, > > + INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL); > > +} > > + > > /* > > * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices > > * Attached to the Display Adapter). > > diff --git a/drivers/gpu/drm/i915/display/intel_acpi.h b/drivers/gpu/drm/i915/display/intel_acpi.h > > index e8b068661d22..9f197401c313 100644 > > --- a/drivers/gpu/drm/i915/display/intel_acpi.h > > +++ b/drivers/gpu/drm/i915/display/intel_acpi.h > > @@ -11,11 +11,14 @@ struct drm_i915_private; > > #ifdef CONFIG_ACPI > > void intel_register_dsm_handler(void); > > void intel_unregister_dsm_handler(void); > > +void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915); > > void intel_acpi_device_id_update(struct drm_i915_private *i915); > > #else > > static inline void intel_register_dsm_handler(void) { return; } > > static inline void intel_unregister_dsm_handler(void) { return; } > > static inline > > +void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915) { return; } > > +static inline > > void intel_acpi_device_id_update(struct drm_i915_private *i915) { return; } > > #endif /* CONFIG_ACPI */ > > > > diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c > > index dfd724e506b5..3855fba70980 100644 > > --- a/drivers/gpu/drm/i915/display/intel_opregion.c > > +++ b/drivers/gpu/drm/i915/display/intel_opregion.c > > @@ -1078,6 +1078,9 @@ void intel_opregion_resume(struct drm_i915_private *i915) > > opregion->asle->ardy = ASLE_ARDY_READY; > > } > > > > + /* Some platforms abuse the _DSM to enable MUX */ > > + intel_dsm_get_bios_data_funcs_supported(i915); > > + > > intel_opregion_notify_adapter(i915, PCI_D0); > > } > > > > -- > > 2.31.1 > >
