nouveau_vga.c

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#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 nouveau_device *device = nouveau_dev(priv);

    if (device->chipset >= 0x40)
        nv_wr32(device, 0x088054, state);
    else
        nv_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);
    pm_message_t pmm = { .event = PM_EVENT_SUSPEND };

    if (state == VGA_SWITCHEROO_ON) {
        printk(KERN_ERR "VGA switcheroo: switched nouveau on\n");
        dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
        nouveau_drm_resume(pdev);
        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_drm_suspend(pdev, pmm);
        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);
    bool can_switch;

    spin_lock(&dev->count_lock);
    can_switch = (dev->open_count == 0);
    spin_unlock(&dev->count_lock);
    return can_switch;
}

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;
    vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode);
    vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops);
}

void
nouveau_vga_fini(struct nouveau_drm *drm)
{
    struct drm_device *dev = drm->dev;
    vga_switcheroo_unregister_client(dev->pdev);
    vga_client_register(dev->pdev, NULL, NULL, NULL);
}


void
nouveau_vga_lastclose(struct drm_device *dev)
{
    vga_switcheroo_process_delayed_switch();
}