From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 drivers/gpu/drm/nouveau/nouveau_vga.c | 129 ++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 drivers/gpu/drm/nouveau/nouveau_vga.c

(limited to 'drivers/gpu/drm/nouveau/nouveau_vga.c')

diff --git a/drivers/gpu/drm/nouveau/nouveau_vga.c b/drivers/gpu/drm/nouveau/nouveau_vga.c
new file mode 100644
index 000000000..c7592ec8e
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_vga.c
@@ -0,0 +1,129 @@
+#include <linux/vgaarb.h>
+#include <linux/vga_switcheroo.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+
+#include "nouveau_drm.h"
+#include "nouveau_acpi.h"
+#include "nouveau_fbcon.h"
+#include "nouveau_vga.h"
+
+static unsigned int
+nouveau_vga_set_decode(void *priv, bool state)
+{
+	struct nvif_device *device = &nouveau_drm(priv)->device;
+
+	if (device->info.family == NV_DEVICE_INFO_V0_CURIE &&
+	    device->info.chipset >= 0x4c)
+		nvif_wr32(device, 0x088060, state);
+	else
+	if (device->info.chipset >= 0x40)
+		nvif_wr32(device, 0x088054, state);
+	else
+		nvif_wr32(device, 0x001854, state);
+
+	if (state)
+		return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
+		       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+	else
+		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+}
+
+static void
+nouveau_switcheroo_set_state(struct pci_dev *pdev,
+			     enum vga_switcheroo_state state)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+
+	if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
+		return;
+
+	if (state == VGA_SWITCHEROO_ON) {
+		printk(KERN_ERR "VGA switcheroo: switched nouveau on\n");
+		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
+		nouveau_pmops_resume(&pdev->dev);
+		drm_kms_helper_poll_enable(dev);
+		dev->switch_power_state = DRM_SWITCH_POWER_ON;
+	} else {
+		printk(KERN_ERR "VGA switcheroo: switched nouveau off\n");
+		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
+		drm_kms_helper_poll_disable(dev);
+		nouveau_switcheroo_optimus_dsm();
+		nouveau_pmops_suspend(&pdev->dev);
+		dev->switch_power_state = DRM_SWITCH_POWER_OFF;
+	}
+}
+
+static void
+nouveau_switcheroo_reprobe(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+	nouveau_fbcon_output_poll_changed(dev);
+}
+
+static bool
+nouveau_switcheroo_can_switch(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+
+	/*
+	 * FIXME: open_count is protected by drm_global_mutex but that would lead to
+	 * locking inversion with the driver load path. And the access here is
+	 * completely racy anyway. So don't bother with locking for now.
+	 */
+	return dev->open_count == 0;
+}
+
+static const struct vga_switcheroo_client_ops
+nouveau_switcheroo_ops = {
+	.set_gpu_state = nouveau_switcheroo_set_state,
+	.reprobe = nouveau_switcheroo_reprobe,
+	.can_switch = nouveau_switcheroo_can_switch,
+};
+
+void
+nouveau_vga_init(struct nouveau_drm *drm)
+{
+	struct drm_device *dev = drm->dev;
+	bool runtime = false;
+
+	/* only relevant for PCI devices */
+	if (!dev->pdev)
+		return;
+
+	vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode);
+
+	if (nouveau_runtime_pm == 1)
+		runtime = true;
+	if ((nouveau_runtime_pm == -1) && (nouveau_is_optimus() || nouveau_is_v1_dsm()))
+		runtime = true;
+	vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, runtime);
+
+	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
+		vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain);
+}
+
+void
+nouveau_vga_fini(struct nouveau_drm *drm)
+{
+	struct drm_device *dev = drm->dev;
+	bool runtime = false;
+
+	if (nouveau_runtime_pm == 1)
+		runtime = true;
+	if ((nouveau_runtime_pm == -1) && (nouveau_is_optimus() || nouveau_is_v1_dsm()))
+		runtime = true;
+
+	vga_switcheroo_unregister_client(dev->pdev);
+	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
+		vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
+	vga_client_register(dev->pdev, NULL, NULL, NULL);
+}
+
+
+void
+nouveau_vga_lastclose(struct drm_device *dev)
+{
+	vga_switcheroo_process_delayed_switch();
+}
-- 
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