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* [PATCH v3] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
@ 2021-04-26 15:24 Kai-Heng Feng
  2021-05-11  3:33 ` Kai-Heng Feng
  2021-05-11 18:19 ` Ville Syrjälä
  0 siblings, 2 replies; 5+ messages in thread
From: Kai-Heng Feng @ 2021-04-26 15:24 UTC (permalink / raw)
  To: jani.nikula, joonas.lahtinen, rodrigo.vivi, ville.syrjala
  Cc: Kai-Heng Feng, David Airlie, Daniel Vetter, Takashi Iwai,
	Manasi Navare, José Roberto de Souza, Chris Wilson,
	Imre Deak, Dave Airlie, Maarten Lankhorst, Karthik B S,
	Matt Roper, 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.

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    | 18 ++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_acpi.h    |  3 +++
 drivers/gpu/drm/i915/display/intel_display.c |  2 ++
 3 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
index 833d0c1be4f1..d008d3976261 100644
--- a/drivers/gpu/drm/i915/display/intel_acpi.c
+++ b/drivers/gpu/drm/i915/display/intel_acpi.c
@@ -13,12 +13,17 @@
 #include "intel_display_types.h"
 
 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
+#define INTEL_DSM_FN_PLATFORM_MUX_ENABLE 0 /* No args */
 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
 
 static const guid_t intel_dsm_guid =
 	GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
 		  0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
 
+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 +181,19 @@ void intel_unregister_dsm_handler(void)
 {
 }
 
+void intel_dsm_enable_mux(struct drm_i915_private *i915)
+{
+	struct pci_dev *pdev = i915->drm.pdev;
+	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_PLATFORM_MUX_ENABLE, 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..def013cf6308 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_enable_mux(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_enable_mux(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_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index a10e26380ef3..d79dae370b20 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -11472,6 +11472,8 @@ void intel_modeset_init_hw(struct drm_i915_private *i915)
 {
 	struct intel_cdclk_state *cdclk_state;
 
+	intel_dsm_enable_mux(i915);
+
 	if (!HAS_DISPLAY(i915))
 		return;
 
-- 
2.30.2


^ permalink raw reply related	[flat|nested] 5+ messages in thread

* Re: [PATCH v3] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
  2021-04-26 15:24 [PATCH v3] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops Kai-Heng Feng
@ 2021-05-11  3:33 ` Kai-Heng Feng
  2021-05-11 18:19 ` Ville Syrjälä
  1 sibling, 0 replies; 5+ messages in thread
From: Kai-Heng Feng @ 2021-05-11  3:33 UTC (permalink / raw)
  To: Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Ville Syrjälä
  Cc: David Airlie, Daniel Vetter, Takashi Iwai, Manasi Navare,
	José Roberto de Souza, Chris Wilson, Imre Deak, Dave Airlie,
	Maarten Lankhorst, Karthik B S, Matt Roper, intel-gfx,
	open list:DRM DRIVERS, open list

On Mon, Apr 26, 2021 at 11:24 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.
>
> 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    | 18 ++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_acpi.h    |  3 +++
>  drivers/gpu/drm/i915/display/intel_display.c |  2 ++
>  3 files changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
> index 833d0c1be4f1..d008d3976261 100644
> --- a/drivers/gpu/drm/i915/display/intel_acpi.c
> +++ b/drivers/gpu/drm/i915/display/intel_acpi.c
> @@ -13,12 +13,17 @@
>  #include "intel_display_types.h"
>
>  #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
> +#define INTEL_DSM_FN_PLATFORM_MUX_ENABLE 0 /* No args */
>  #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
>
>  static const guid_t intel_dsm_guid =
>         GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
>                   0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
>
> +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 +181,19 @@ void intel_unregister_dsm_handler(void)
>  {
>  }
>
> +void intel_dsm_enable_mux(struct drm_i915_private *i915)
> +{
> +       struct pci_dev *pdev = i915->drm.pdev;
> +       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_PLATFORM_MUX_ENABLE, 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..def013cf6308 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_enable_mux(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_enable_mux(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_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index a10e26380ef3..d79dae370b20 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -11472,6 +11472,8 @@ void intel_modeset_init_hw(struct drm_i915_private *i915)
>  {
>         struct intel_cdclk_state *cdclk_state;
>
> +       intel_dsm_enable_mux(i915);
> +
>         if (!HAS_DISPLAY(i915))
>                 return;
>
> --
> 2.30.2
>

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH v3] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
  2021-04-26 15:24 [PATCH v3] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops Kai-Heng Feng
  2021-05-11  3:33 ` Kai-Heng Feng
@ 2021-05-11 18:19 ` Ville Syrjälä
  2021-05-14  9:38   ` Kai-Heng Feng
  1 sibling, 1 reply; 5+ messages in thread
From: Ville Syrjälä @ 2021-05-11 18:19 UTC (permalink / raw)
  To: Kai-Heng Feng
  Cc: jani.nikula, joonas.lahtinen, rodrigo.vivi, David Airlie,
	Daniel Vetter, Takashi Iwai, Manasi Navare,
	José Roberto de Souza, Chris Wilson, Imre Deak, Dave Airlie,
	Maarten Lankhorst, Karthik B S, Matt Roper, intel-gfx,
	open list:DRM DRIVERS, open list

On Mon, Apr 26, 2021 at 11:24:10PM +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.
> 
> 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    | 18 ++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_acpi.h    |  3 +++
>  drivers/gpu/drm/i915/display/intel_display.c |  2 ++
>  3 files changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
> index 833d0c1be4f1..d008d3976261 100644
> --- a/drivers/gpu/drm/i915/display/intel_acpi.c
> +++ b/drivers/gpu/drm/i915/display/intel_acpi.c
> @@ -13,12 +13,17 @@
>  #include "intel_display_types.h"
>  
>  #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
> +#define INTEL_DSM_FN_PLATFORM_MUX_ENABLE 0 /* No args */

This block of defines is for the other DSM. We don't want to
mix these up. We also want to name it according to the spec,
so something like GET_BIOS_DATA_FUNCS_SUPPORTED. Similarly
for the intel_dsm_enable_mux() wrapper function. + it needs
a comment to document that some BIOSes abuse it to do MUX
initialization and whatnot.

We should perhaps rename all the old DSM stuff to
something a bit less generic as well...

>  #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
>  
>  static const guid_t intel_dsm_guid =
>  	GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
>  		  0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
>  
> +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 +181,19 @@ void intel_unregister_dsm_handler(void)
>  {
>  }
>  
> +void intel_dsm_enable_mux(struct drm_i915_private *i915)
> +{
> +	struct pci_dev *pdev = i915->drm.pdev;
> +	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_PLATFORM_MUX_ENABLE, 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..def013cf6308 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_enable_mux(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_enable_mux(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_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index a10e26380ef3..d79dae370b20 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -11472,6 +11472,8 @@ void intel_modeset_init_hw(struct drm_i915_private *i915)
>  {
>  	struct intel_cdclk_state *cdclk_state;
>  
> +	intel_dsm_enable_mux(i915);
> +

This should probably be somewhere around where we do all the other
semi ACPI related init (OpRegion/etc.).

>  	if (!HAS_DISPLAY(i915))
>  		return;
>  
> -- 
> 2.30.2

-- 
Ville Syrjälä
Intel

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH v3] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
  2021-05-11 18:19 ` Ville Syrjälä
@ 2021-05-14  9:38   ` Kai-Heng Feng
  2021-05-17 12:15     ` Jani Nikula
  0 siblings, 1 reply; 5+ messages in thread
From: Kai-Heng Feng @ 2021-05-14  9:38 UTC (permalink / raw)
  To: Ville Syrjälä
  Cc: Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, David Airlie,
	Daniel Vetter, Takashi Iwai, Manasi Navare,
	José Roberto de Souza, Chris Wilson, Imre Deak, Dave Airlie,
	Maarten Lankhorst, Karthik B S, Matt Roper, intel-gfx,
	open list:DRM DRIVERS, open list

On Wed, May 12, 2021 at 2:19 AM Ville Syrjälä
<ville.syrjala@linux.intel.com> wrote:
>
> On Mon, Apr 26, 2021 at 11:24:10PM +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.
> >
> > 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    | 18 ++++++++++++++++++
> >  drivers/gpu/drm/i915/display/intel_acpi.h    |  3 +++
> >  drivers/gpu/drm/i915/display/intel_display.c |  2 ++
> >  3 files changed, 23 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
> > index 833d0c1be4f1..d008d3976261 100644
> > --- a/drivers/gpu/drm/i915/display/intel_acpi.c
> > +++ b/drivers/gpu/drm/i915/display/intel_acpi.c
> > @@ -13,12 +13,17 @@
> >  #include "intel_display_types.h"
> >
> >  #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
> > +#define INTEL_DSM_FN_PLATFORM_MUX_ENABLE 0 /* No args */
>
> This block of defines is for the other DSM. We don't want to
> mix these up. We also want to name it according to the spec,
> so something like GET_BIOS_DATA_FUNCS_SUPPORTED. Similarly
> for the intel_dsm_enable_mux() wrapper function. + it needs
> a comment to document that some BIOSes abuse it to do MUX
> initialization and whatnot.

Will do.


>
> We should perhaps rename all the old DSM stuff to
> something a bit less generic as well...

I can rename them as well. But what's the naming scheme you prefer?

>
> >  #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
> >
> >  static const guid_t intel_dsm_guid =
> >       GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
> >                 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
> >
> > +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 +181,19 @@ void intel_unregister_dsm_handler(void)
> >  {
> >  }
> >
> > +void intel_dsm_enable_mux(struct drm_i915_private *i915)
> > +{
> > +     struct pci_dev *pdev = i915->drm.pdev;
> > +     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_PLATFORM_MUX_ENABLE, 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..def013cf6308 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_enable_mux(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_enable_mux(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_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> > index a10e26380ef3..d79dae370b20 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -11472,6 +11472,8 @@ void intel_modeset_init_hw(struct drm_i915_private *i915)
> >  {
> >       struct intel_cdclk_state *cdclk_state;
> >
> > +     intel_dsm_enable_mux(i915);
> > +
>
> This should probably be somewhere around where we do all the other
> semi ACPI related init (OpRegion/etc.).

Hmm, but Jani prefers to put it inside intel_modeset_*() helpers. But
I don't see any opregion related functions are being called by
intel_modeset_*() helpers. Any suggestion?

Kai-Heng

>
> >       if (!HAS_DISPLAY(i915))
> >               return;
> >
> > --
> > 2.30.2
>
> --
> Ville Syrjälä
> Intel

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH v3] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops
  2021-05-14  9:38   ` Kai-Heng Feng
@ 2021-05-17 12:15     ` Jani Nikula
  0 siblings, 0 replies; 5+ messages in thread
From: Jani Nikula @ 2021-05-17 12:15 UTC (permalink / raw)
  To: Kai-Heng Feng, Ville Syrjälä
  Cc: Joonas Lahtinen, Rodrigo Vivi, David Airlie, Daniel Vetter,
	Takashi Iwai, Manasi Navare, José Roberto de Souza,
	Chris Wilson, Imre Deak, Dave Airlie, Maarten Lankhorst,
	Karthik B S, Matt Roper, intel-gfx, open list:DRM DRIVERS,
	open list

On Fri, 14 May 2021, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
> On Wed, May 12, 2021 at 2:19 AM Ville Syrjälä
> <ville.syrjala@linux.intel.com> wrote:
>>
>> On Mon, Apr 26, 2021 at 11:24:10PM +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.
>> >
>> > 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    | 18 ++++++++++++++++++
>> >  drivers/gpu/drm/i915/display/intel_acpi.h    |  3 +++
>> >  drivers/gpu/drm/i915/display/intel_display.c |  2 ++
>> >  3 files changed, 23 insertions(+)
>> >
>> > diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
>> > index 833d0c1be4f1..d008d3976261 100644
>> > --- a/drivers/gpu/drm/i915/display/intel_acpi.c
>> > +++ b/drivers/gpu/drm/i915/display/intel_acpi.c
>> > @@ -13,12 +13,17 @@
>> >  #include "intel_display_types.h"
>> >
>> >  #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
>> > +#define INTEL_DSM_FN_PLATFORM_MUX_ENABLE 0 /* No args */
>>
>> This block of defines is for the other DSM. We don't want to
>> mix these up. We also want to name it according to the spec,
>> so something like GET_BIOS_DATA_FUNCS_SUPPORTED. Similarly
>> for the intel_dsm_enable_mux() wrapper function. + it needs
>> a comment to document that some BIOSes abuse it to do MUX
>> initialization and whatnot.
>
> Will do.
>
>
>>
>> We should perhaps rename all the old DSM stuff to
>> something a bit less generic as well...
>
> I can rename them as well. But what's the naming scheme you prefer?
>
>>
>> >  #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
>> >
>> >  static const guid_t intel_dsm_guid =
>> >       GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
>> >                 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
>> >
>> > +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 +181,19 @@ void intel_unregister_dsm_handler(void)
>> >  {
>> >  }
>> >
>> > +void intel_dsm_enable_mux(struct drm_i915_private *i915)
>> > +{
>> > +     struct pci_dev *pdev = i915->drm.pdev;
>> > +     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_PLATFORM_MUX_ENABLE, 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..def013cf6308 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_enable_mux(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_enable_mux(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_display.c b/drivers/gpu/drm/i915/display/intel_display.c
>> > index a10e26380ef3..d79dae370b20 100644
>> > --- a/drivers/gpu/drm/i915/display/intel_display.c
>> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
>> > @@ -11472,6 +11472,8 @@ void intel_modeset_init_hw(struct drm_i915_private *i915)
>> >  {
>> >       struct intel_cdclk_state *cdclk_state;
>> >
>> > +     intel_dsm_enable_mux(i915);
>> > +
>>
>> This should probably be somewhere around where we do all the other
>> semi ACPI related init (OpRegion/etc.).
>
> Hmm, but Jani prefers to put it inside intel_modeset_*() helpers. But
> I don't see any opregion related functions are being called by
> intel_modeset_*() helpers. Any suggestion?

I think I mainly wanted it in intel_display.c instead of at the driver
top level.

BR,
Jani.


>
> Kai-Heng
>
>>
>> >       if (!HAS_DISPLAY(i915))
>> >               return;
>> >
>> > --
>> > 2.30.2
>>
>> --
>> Ville Syrjälä
>> Intel

-- 
Jani Nikula, Intel Open Source Graphics Center

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2021-05-17 12:16 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-26 15:24 [PATCH v3] drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops Kai-Heng Feng
2021-05-11  3:33 ` Kai-Heng Feng
2021-05-11 18:19 ` Ville Syrjälä
2021-05-14  9:38   ` Kai-Heng Feng
2021-05-17 12:15     ` Jani Nikula

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