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vga_switcheroo: split switching into two stages. 

stage 1: turn card on, switch boot vga pointer.
stage 2: switch fbs, switch mux and power off old card.

Signed-off-by: Dave Airlie <airlied@redhat.com>
hifive-unleashed-5.1
Dave Airlie 2010-12-07 14:24:25 +10:00
parent 5bcf719b7d
commit 66b37c6777
1 changed files with 34 additions and 11 deletions
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45
drivers/gpu/vga/vga_switcheroo.c
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@ -212,7 +212,8 @@ static int vga_switchoff(struct vga_switcheroo_client *client)
return 0;
}
static int vga_switchto(struct vga_switcheroo_client *new_client)
/* stage one happens before delay */
static int vga_switchto_stage1(struct vga_switcheroo_client *new_client)
{
int ret;
int i;
@ -239,10 +240,28 @@ static int vga_switchto(struct vga_switcheroo_client *new_client)
vga_switchon(new_client);
/* swap shadow resource to denote boot VGA device has changed so X starts on new device */
active->active = false;
active->pdev->resource[PCI_ROM_RESOURCE].flags &= ~IORESOURCE_ROM_SHADOW;
new_client->pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
return 0;
}
/* post delay */
static int vga_switchto_stage2(struct vga_switcheroo_client *new_client)
{
int ret;
int i;
struct vga_switcheroo_client *active = NULL;
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
if (vgasr_priv.clients[i].active == true) {
active = &vgasr_priv.clients[i];
break;
}
}
if (!active)
return 0;
active->active = false;
if (new_client->fb_info) {
struct fb_event event;
@ -368,18 +387,22 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
if (can_switch == true) {
pdev_name = pci_name(client->pdev);
ret = vga_switchto(client);
ret = vga_switchto_stage1(client);
if (ret)
printk(KERN_ERR "vga_switcheroo: switching failed %d\n", ret);
printk(KERN_ERR "vga_switcheroo: switching failed stage 1 %d\n", ret);
ret = vga_switchto_stage2(client);
if (ret)
printk(KERN_ERR "vga_switcheroo: switching failed stage 2 %d\n", ret);
} else {
printk(KERN_INFO "vga_switcheroo: setting delayed switch to client %d\n", client->id);
vgasr_priv.delayed_switch_active = true;
vgasr_priv.delayed_client_id = client_id;
/* we should at least power up the card to
make the switch faster */
if (client->pwr_state == VGA_SWITCHEROO_OFF)
vga_switchon(client);
ret = vga_switchto_stage1(client);
if (ret)
printk(KERN_ERR "vga_switcheroo: delayed switching stage 1 failed %d\n", ret);
}
out:
@ -461,9 +484,9 @@ int vga_switcheroo_process_delayed_switch(void)
goto err;
pdev_name = pci_name(client->pdev);
ret = vga_switchto(client);
ret = vga_switchto_stage2(client);
if (ret)
printk(KERN_ERR "vga_switcheroo: delayed switching failed %d\n", ret);
printk(KERN_ERR "vga_switcheroo: delayed switching failed stage 2 %d\n", ret);
vgasr_priv.delayed_switch_active = false;
err = 0;