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-rw-r--r--i915-vga-arbiter.patch159
1 files changed, 159 insertions, 0 deletions
diff --git a/i915-vga-arbiter.patch b/i915-vga-arbiter.patch
new file mode 100644
index 00000000000..04b52e0cbef
--- /dev/null
+++ b/i915-vga-arbiter.patch
@@ -0,0 +1,159 @@
+From bd149c5c439683f2b2bb011e6aa08c304ea4fe77 Mon Sep 17 00:00:00 2001
+From: Mark Weiman <mark.weiman@markzz.com>
+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
+