From b5e350f919acb8ef6961bc1b62e395f53cea123a Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Fri, 3 Jan 2014 18:29:00 -0700 Subject: [PATCH] agp/intel: Use pci_bus_address() to get GTTADR bus address Per the Intel 915G/915GV/... Chipset spec (document number 301467-005), GTTADR is a standard PCI BAR. The PCI core reads GTTADR at enumeration-time. Use pci_bus_address() instead of reading it again in the driver. This works correctly for both 32-bit and 64-bit BARs. The spec above only mentions 32-bit GTTADR, but we should still use the standard interface. Signed-off-by: Bjorn Helgaas Reviewed-by: Daniel Vetter --- drivers/char/agp/intel-agp.h | 2 +- drivers/char/agp/intel-gtt.c | 7 +++---- 2 files changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/char/agp/intel-agp.h b/drivers/char/agp/intel-agp.h index 18bbaafb8509..fda073dcd967 100644 --- a/drivers/char/agp/intel-agp.h +++ b/drivers/char/agp/intel-agp.h @@ -115,7 +115,7 @@ /* intel 915G registers */ #define I915_GMADR_BAR 2 #define I915_MMADR_BAR 0 -#define I915_PTEADDR 0x1C +#define I915_PTE_BAR 3 #define I915_GMCH_GMS_STOLEN_48M (0x6 << 4) #define I915_GMCH_GMS_STOLEN_64M (0x7 << 4) #define G33_GMCH_GMS_STOLEN_128M (0x8 << 4) diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c index 58916f32c0f3..dd8b66a617dc 100644 --- a/drivers/char/agp/intel-gtt.c +++ b/drivers/char/agp/intel-gtt.c @@ -1102,7 +1102,7 @@ static void i965_write_entry(dma_addr_t addr, static int i9xx_setup(void) { - u32 reg_addr, gtt_addr; + u32 reg_addr; int size = KB(512); reg_addr = pci_bus_address(intel_private.pcidev, I915_MMADR_BAR); @@ -1113,9 +1113,8 @@ static int i9xx_setup(void) switch (INTEL_GTT_GEN) { case 3: - pci_read_config_dword(intel_private.pcidev, - I915_PTEADDR, >t_addr); - intel_private.gtt_phys_addr = gtt_addr; + intel_private.gtt_phys_addr = + pci_bus_address(intel_private.pcidev, I915_PTE_BAR); break; case 5: intel_private.gtt_phys_addr = reg_addr + MB(2); -- 2.20.1