From bd149c5c439683f2b2bb011e6aa08c304ea4fe77 Mon Sep 17 00:00:00 2001 From: Mark Weiman Date: Fri, 10 Feb 2017 10:57:22 -0500 Subject: [PATCH] i915: Add module option to support VGA arbiter on HD devices --- drivers/gpu/drm/i915/i915_drv.c | 22 +++++++++++++++++++--- drivers/gpu/drm/i915/i915_params.c | 5 +++++ drivers/gpu/drm/i915/i915_params.h | 1 + drivers/gpu/drm/i915/intel_display.c | 30 ++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_drv.h | 1 + 5 files changed, 56 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 670beebc32f6..4250d27d0709 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -585,10 +585,20 @@ static int i915_load_modeset_init(struct drm_device *dev) * If we are a secondary display controller (!PCI_DISPLAY_CLASS_VGA), * then we do not take part in VGA arbitration and the * vga_client_register() fails with -ENODEV. + * + * NB. The set_decode callback here actually works on GMCH + * devices, on newer HD devices we can only disable VGA MMIO space. + * Disabling VGA I/O space requires disabling I/O in the PCI command + * register. Nonetheless, we like to pretend that we participate in + * VGA arbitration and can dynamically disable VGA I/O space because + * this makes X happy, even though it's a complete lie. */ - ret = vga_client_register(pdev, dev, NULL, i915_vga_set_decode); - if (ret && ret != -ENODEV) - goto out; + if (!i915.enable_hd_vgaarb || !HAS_PCH_SPLIT(dev)) { + ret = vga_client_register(dev->pdev, dev, NULL, + i915_vga_set_decode); + if (ret && ret != -ENODEV) + goto out; + } intel_register_dsm_handler(); @@ -628,6 +638,12 @@ static int i915_load_modeset_init(struct drm_device *dev) if (ret) goto cleanup_gem; + /* + * Must do this after fbcon init so that + * vgacon_save_screen() works during the handover. + */ + i915_disable_vga_mem(dev); + /* Only enable hotplug handling once the fbdev is fully set up. */ intel_hpd_init(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index 768ad89d9cd4..adb3a0188ae6 100644 --- a/drivers/gpu/drm/i915/i915_params.c +++ b/drivers/gpu/drm/i915/i915_params.c @@ -50,6 +50,7 @@ struct i915_params i915 __read_mostly = { .invert_brightness = 0, .disable_display = 0, .enable_cmd_parser = 1, + .enable_hd_vgaarb = false, .use_mmio_flip = 0, .mmio_debug = 0, .verbose_state_checks = 1, @@ -182,6 +183,10 @@ module_param_named_unsafe(enable_cmd_parser, i915.enable_cmd_parser, int, 0600); MODULE_PARM_DESC(enable_cmd_parser, "Enable command parsing (1=enabled [default], 0=disabled)"); +module_param_named(enable_hd_vgaarb, i915.enable_hd_vgaarb, bool, 0444); +MODULE_PARM_DESC(enable_hd_vgaarb, + "Enable support for VGA arbitration on Intel HD IGD. (default: false)"); + module_param_named_unsafe(use_mmio_flip, i915.use_mmio_flip, int, 0600); MODULE_PARM_DESC(use_mmio_flip, "use MMIO flips (-1=never, 0=driver discretion [default], 1=always)"); diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h index 3a0dd78ddb38..0a3af055b22f 100644 --- a/drivers/gpu/drm/i915/i915_params.h +++ b/drivers/gpu/drm/i915/i915_params.h @@ -60,6 +60,7 @@ struct i915_params { bool force_reset_modeset_test; bool reset; bool disable_display; + bool enable_hd_vgaarb; bool verbose_state_checks; bool nuclear_pageflip; bool enable_dp_mst; diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 8079e5b380cb..d2593978c114 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -16266,6 +16266,33 @@ static void i915_disable_vga(struct drm_device *dev) POSTING_READ(vga_reg); } +static void i915_enable_vga_mem(struct drm_device *dev) +{ + /* Enable VGA memory on Intel HD */ + if (i915.enable_hd_vgaarb && HAS_PCH_SPLIT(dev)) { + vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); + outb(inb(VGA_MSR_READ) | VGA_MSR_MEM_EN, VGA_MSR_WRITE); + vga_set_legacy_decoding(dev->pdev, VGA_RSRC_LEGACY_IO | + VGA_RSRC_LEGACY_MEM | + VGA_RSRC_NORMAL_IO | + VGA_RSRC_NORMAL_MEM); + vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); + } +} + +void i915_disable_vga_mem(struct drm_device *dev) +{ + /* Disable VGA memory on Intel HD */ + if (i915.enable_hd_vgaarb && HAS_PCH_SPLIT(dev)) { + vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); + outb(inb(VGA_MSR_READ) & ~VGA_MSR_MEM_EN, VGA_MSR_WRITE); + vga_set_legacy_decoding(dev->pdev, VGA_RSRC_LEGACY_IO | + VGA_RSRC_NORMAL_IO | + VGA_RSRC_NORMAL_MEM); + vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); + } +} + void intel_modeset_init_hw(struct drm_device *dev) { struct drm_i915_private *dev_priv = to_i915(dev); @@ -16703,6 +16730,7 @@ void i915_redisable_vga_power_on(struct drm_device *dev) if (!(I915_READ(vga_reg) & VGA_DISP_DISABLE)) { DRM_DEBUG_KMS("Something enabled VGA plane, disabling it\n"); i915_disable_vga(dev); + i915_disable_vga_mem(dev); } } @@ -17063,6 +17091,8 @@ void intel_modeset_cleanup(struct drm_device *dev) { struct drm_i915_private *dev_priv = to_i915(dev); + i915_enable_vga_mem(dev); + intel_disable_gt_powersave(dev_priv); /* diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index a19ec06f9e42..f02005f8b9a9 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1189,6 +1189,7 @@ int vlv_get_cck_clock(struct drm_i915_private *dev_priv, void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv); void lpt_disable_iclkip(struct drm_i915_private *dev_priv); extern const struct drm_plane_funcs intel_plane_funcs; +extern void i915_disable_vga_mem(struct drm_device *dev); void intel_init_display_hooks(struct drm_i915_private *dev_priv); unsigned int intel_fb_xy_to_linear(int x, int y, const struct intel_plane_state *state, -- 2.11.1