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* [PATCH v4] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
@ 2021-05-20  6:58 Kai-Heng Feng
  2021-06-04 15:57 ` Kai-Heng Feng
  2021-07-12  7:40 ` Ville Syrjälä
  0 siblings, 2 replies; 4+ messages in thread
From: Kai-Heng Feng @ 2021-05-20  6:58 UTC (permalink / raw)
  To: jani.nikula, joonas.lahtinen, rodrigo.vivi, ville.syrjala
  Cc: Kai-Heng Feng, David Airlie, Daniel Vetter, Takashi Iwai,
	Chris Wilson, Lucas De Marchi, Thomas Zimmermann, intel-gfx,
	open list:DRM DRIVERS, open list

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@intel.com/
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 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


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [PATCH v4] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
  2021-05-20  6:58 [PATCH v4] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops Kai-Heng Feng
@ 2021-06-04 15:57 ` Kai-Heng Feng
  2021-06-15  7:01   ` Kai-Heng Feng
  2021-07-12  7:40 ` Ville Syrjälä
  1 sibling, 1 reply; 4+ messages in thread
From: Kai-Heng Feng @ 2021-06-04 15:57 UTC (permalink / raw)
  To: Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Ville Syrjälä
  Cc: David Airlie, Daniel Vetter, Takashi Iwai, Chris Wilson,
	Lucas De Marchi, Thomas Zimmermann, intel-gfx,
	open list:DRM DRIVERS, open list

On Thu, May 20, 2021 at 2:58 PM Kai-Heng Feng
<kai.heng.feng@canonical.com> 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@intel.com/
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

A 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
>

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: [PATCH v4] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
  2021-06-04 15:57 ` Kai-Heng Feng
@ 2021-06-15  7:01   ` Kai-Heng Feng
  0 siblings, 0 replies; 4+ messages in thread
From: Kai-Heng Feng @ 2021-06-15  7:01 UTC (permalink / raw)
  To: Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Ville Syrjälä
  Cc: David Airlie, Daniel Vetter, Takashi Iwai, Chris Wilson,
	Lucas De Marchi, Thomas Zimmermann, intel-gfx,
	open list:DRM DRIVERS, open list

On Fri, Jun 4, 2021 at 11:57 PM Kai-Heng Feng
<kai.heng.feng@canonical.com> wrote:
>
> On Thu, May 20, 2021 at 2:58 PM Kai-Heng Feng
> <kai.heng.feng@canonical.com> 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@intel.com/
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>
> 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
> >

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: [PATCH v4] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
  2021-05-20  6:58 [PATCH v4] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops Kai-Heng Feng
  2021-06-04 15:57 ` Kai-Heng Feng
@ 2021-07-12  7:40 ` Ville Syrjälä
  1 sibling, 0 replies; 4+ messages in thread
From: Ville Syrjälä @ 2021-07-12  7:40 UTC (permalink / raw)
  To: Kai-Heng Feng
  Cc: jani.nikula, joonas.lahtinen, rodrigo.vivi, David Airlie,
	Daniel Vetter, Takashi Iwai, Chris Wilson, Lucas De Marchi,
	Thomas Zimmermann, intel-gfx, open list:DRM DRIVERS, open list

On Thu, May 20, 2021 at 02:58:20PM +0800, Kai-Heng Feng 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@intel.com/
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

Thanks. Pushed to drm-intel-next. And sorry for the lag.

> ---
>  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

-- 
Ville Syrjälä
Intel

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-07-12  8:29 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-20  6:58 [PATCH v4] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops Kai-Heng Feng
2021-06-04 15:57 ` Kai-Heng Feng
2021-06-15  7:01   ` Kai-Heng Feng
2021-07-12  7:40 ` Ville Syrjälä

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