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agp/intel: Sandybridge doesn't require GMCH enabling 

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-10-29 18:11:26 +01:00
parent c584fe47e4
commit e380f60b22
1 changed files with 31 additions and 8 deletions
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39
drivers/char/agp/intel-gtt.c
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@ -922,10 +922,11 @@ static void i830_write_entry(dma_addr_t addr, unsigned int entry,
writel(addr | pte_flags, intel_private.gtt + entry);
}
static void intel_enable_gtt(void)
static bool intel_enable_gtt(void)
{
u32 gma_addr;
u16 gmch_ctrl;
u8 __iomem *reg;
if (INTEL_GTT_GEN == 2)
pci_read_config_dword(intel_private.pcidev, I810_GMADDR,
@ -936,13 +937,34 @@ static void intel_enable_gtt(void)
intel_private.gma_bus_addr = (gma_addr & PCI_BASE_ADDRESS_MEM_MASK);
pci_read_config_word(intel_private.bridge_dev, I830_GMCH_CTRL, &gmch_ctrl);
gmch_ctrl |= I830_GMCH_ENABLED;
pci_write_config_word(intel_private.bridge_dev, I830_GMCH_CTRL, gmch_ctrl);
if (INTEL_GTT_GEN >= 6)
return true;
writel(intel_private.PGETBL_save|I810_PGETBL_ENABLED,
intel_private.registers+I810_PGETBL_CTL);
readl(intel_private.registers+I810_PGETBL_CTL); /* PCI Posting. */
pci_read_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, &gmch_ctrl);
gmch_ctrl |= I830_GMCH_ENABLED;
pci_write_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, gmch_ctrl);
pci_read_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, &gmch_ctrl);
if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) {
dev_err(&intel_private.pcidev->dev,
"failed to enable the GTT: GMCH_CTRL=%x\n",
gmch_ctrl);
return false;
}
reg = intel_private.registers+I810_PGETBL_CTL;
writel(intel_private.PGETBL_save|I810_PGETBL_ENABLED, reg);
if ((readl(reg) & I810_PGETBL_ENABLED) == 0) {
dev_err(&intel_private.pcidev->dev,
"failed to enable the GTT: PGETBL=%x [expected %x|1]\n",
readl(reg), intel_private.PGETBL_save);
return false;
}
return true;
}
static int i830_setup(void)
@ -981,7 +1003,8 @@ static int intel_fake_agp_configure(void)
{
int i;
intel_enable_gtt();
if (!intel_enable_gtt())
return -EIO;
agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;