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@xxxxxxxxx/ Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> --- 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 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
