From 33d2dbe323583bb2f344c857a100f1116fad70d9 Mon Sep 17 00:00:00 2001 From: xiota <> Date: Fri, 29-Dec-2023 12:34:56 +0000 Subject: [PATCH 2/2] i915-vga-arbiter --- .../drm/i915/display/intel_display_driver.c | 16 ++++++++-- .../drm/i915/display/intel_display_driver.h | 1 + drivers/gpu/drm/i915/display/intel_vga.c | 31 +++++++++++++++++++ drivers/gpu/drm/i915/display/intel_vga.h | 4 +++ drivers/gpu/drm/i915/i915_params.c | 3 ++ drivers/gpu/drm/i915/i915_params.h | 1 + 6 files changed, 53 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c index 8f144d4d3..915a5ec47 100644 --- a/drivers/gpu/drm/i915/display/intel_display_driver.c +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c @@ -205,9 +205,11 @@ int intel_display_driver_probe_noirq(struct drm_i915_private *i915) intel_bios_init(i915); - ret = intel_vga_register(i915); - if (ret) - goto cleanup_bios; + if (!i915_modparams.enable_hd_vgaarb || !HAS_PCH_SPLIT(i915)) { + ret = intel_vga_register(i915); + if (ret) + goto cleanup_bios; + } /* FIXME: completely on the wrong abstraction layer */ ret = intel_power_domains_init(i915); @@ -366,6 +368,12 @@ int intel_display_driver_probe(struct drm_i915_private *i915) if (ret) return ret; + /* + * Must do this after fbcon init so that + * vgacon_save_screen() works during the handover. + */ + intel_vga_disable_mem(i915); + /* Only enable hotplug handling once the fbdev is fully set up. */ intel_hpd_init(i915); intel_hpd_poll_disable(i915); @@ -412,6 +420,7 @@ void intel_display_driver_remove(struct drm_i915_private *i915) if (!HAS_DISPLAY(i915)) return; + intel_vga_enable_mem(i915); flush_workqueue(i915->display.wq.flip); flush_workqueue(i915->display.wq.modeset); @@ -444,6 +453,7 @@ void intel_display_driver_remove_noirq(struct drm_i915_private *i915) intel_unregister_dsm_handler(); /* flush any delayed tasks or pending work */ + intel_vga_enable_mem(i915); flush_workqueue(i915->unordered_wq); intel_hdcp_component_fini(i915); diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.h b/drivers/gpu/drm/i915/display/intel_display_driver.h index c276a58ee..54b752a93 100644 --- a/drivers/gpu/drm/i915/display/intel_display_driver.h +++ b/drivers/gpu/drm/i915/display/intel_display_driver.h @@ -13,6 +13,7 @@ struct drm_i915_private; struct drm_modeset_acquire_ctx; struct pci_dev; +extern void intel_vga_disable_mem(struct drm_i915_private *dev_priv); bool intel_display_driver_probe_defer(struct pci_dev *pdev); void intel_display_driver_init_hw(struct drm_i915_private *i915); void intel_display_driver_early_probe(struct drm_i915_private *i915); diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c index 286a0bdd2..18d30ee84 100644 --- a/drivers/gpu/drm/i915/display/intel_vga.c +++ b/drivers/gpu/drm/i915/display/intel_vga.c @@ -47,6 +47,36 @@ void intel_vga_disable(struct drm_i915_private *dev_priv) intel_de_posting_read(dev_priv, vga_reg); } +void intel_vga_enable_mem(struct drm_i915_private *dev_priv) +{ + struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev); + + /* Enable VGA memory on Intel HD */ + if (i915_modparams.enable_hd_vgaarb && HAS_PCH_SPLIT(dev_priv)) { + vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO); + outb(inb(VGA_MIS_R) | (1 << 1), VGA_MIS_W); + vga_set_legacy_decoding(pdev, VGA_RSRC_LEGACY_IO | + VGA_RSRC_LEGACY_MEM | + VGA_RSRC_NORMAL_IO | + VGA_RSRC_NORMAL_MEM); + vga_put(pdev, VGA_RSRC_LEGACY_IO); + } +} + +void intel_vga_disable_mem(struct drm_i915_private *dev_priv) +{ + struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev); + /* Disable VGA memory on Intel HD */ + if (i915_modparams.enable_hd_vgaarb && HAS_PCH_SPLIT(dev_priv)) { + vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO); + outb(inb(VGA_MIS_R) & ~(1 << 1), VGA_MIS_W); + vga_set_legacy_decoding(pdev, VGA_RSRC_LEGACY_IO | + VGA_RSRC_NORMAL_IO | + VGA_RSRC_NORMAL_MEM); + vga_put(pdev, VGA_RSRC_LEGACY_IO); + } +} + void intel_vga_redisable_power_on(struct drm_i915_private *dev_priv) { i915_reg_t vga_reg = intel_vga_cntrl_reg(dev_priv); @@ -55,6 +85,7 @@ void intel_vga_redisable_power_on(struct drm_i915_private *dev_priv) drm_dbg_kms(&dev_priv->drm, "Something enabled VGA plane, disabling it\n"); intel_vga_disable(dev_priv); + intel_vga_disable_mem(dev_priv); } } diff --git a/drivers/gpu/drm/i915/display/intel_vga.h b/drivers/gpu/drm/i915/display/intel_vga.h index ba5b55b91..7e2af7924 100644 --- a/drivers/gpu/drm/i915/display/intel_vga.h +++ b/drivers/gpu/drm/i915/display/intel_vga.h @@ -15,4 +15,8 @@ void intel_vga_redisable_power_on(struct drm_i915_private *i915); int intel_vga_register(struct drm_i915_private *i915); void intel_vga_unregister(struct drm_i915_private *i915); +/* i915 vga arb patch */ +void intel_vga_enable_mem(struct drm_i915_private *i915); +void intel_vga_disable_mem(struct drm_i915_private *i915); + #endif /* __INTEL_VGA_H__ */ diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index 0a171b57f..739d31067 100644 --- a/drivers/gpu/drm/i915/i915_params.c +++ b/drivers/gpu/drm/i915/i915_params.c @@ -160,6 +160,9 @@ i915_param_named_unsafe(invert_brightness, int, 0400, i915_param_named(disable_display, bool, 0400, "Disable display (default: false)"); +i915_param_named(enable_hd_vgaarb, bool, 0444, + "Enable support for VGA arbitration on Intel HD IGD. (default: false)"); + i915_param_named(memtest, bool, 0400, "Perform a read/write test of all device memory on module load (default: off)"); diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h index 68abf0ad6..507d29c52 100644 --- a/drivers/gpu/drm/i915/i915_params.h +++ b/drivers/gpu/drm/i915/i915_params.h @@ -79,6 +79,7 @@ struct drm_printer; param(unsigned int, lmem_size, 0, 0400) \ param(unsigned int, lmem_bar_size, 0, 0400) \ /* leave bools at the end to not create holes */ \ + param(bool, enable_hd_vgaarb, false, 0600) \ param(bool, enable_hangcheck, true, 0600) \ param(bool, load_detect_test, false, 0600) \ param(bool, force_reset_modeset_test, false, 0600) \ -- 2.43.0