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drm/radeon: implement ACPI VFCT vbios fetch (v3) 

This is required for pure UEFI systems.  The vbios is stored
in ACPI rather than at the legacy vga location.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=26891

V2: fix #ifdefs as per Greg's comments
V3: fix it harder

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
David Lamparter 2012-08-16 15:45:20 -04:00 committed by Alex Deucher
parent 52e9b39d9a
commit 268ba0a99f
1 changed files with 60 additions and 0 deletions
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60
drivers/gpu/drm/radeon/radeon_bios.c
View File

@ -32,6 +32,7 @@
#include <linux/vga_switcheroo.h>
#include <linux/slab.h>
#include <linux/acpi.h>
/*
* BIOS.
*/
@ -476,6 +477,63 @@ static bool radeon_read_disabled_bios(struct radeon_device *rdev)
return legacy_read_disabled_bios(rdev);
}
#ifdef CONFIG_ACPI
static bool radeon_acpi_vfct_bios(struct radeon_device *rdev)
{
bool ret = false;
struct acpi_table_header *hdr;
/* acpi_get_table_with_size is not exported :( */
acpi_size tbl_size = 0x7fffffff;
UEFI_ACPI_VFCT *vfct;
GOP_VBIOS_CONTENT *vbios;
VFCT_IMAGE_HEADER *vhdr;
if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
return false;
if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n");
goto out_unmap;
}
vfct = (UEFI_ACPI_VFCT *)hdr;
if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) > tbl_size) {
DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n");
goto out_unmap;
}
vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + vfct->VBIOSImageOffset);
vhdr = &vbios->VbiosHeader;
DRM_INFO("ACPI VFCT contains a BIOS for %02x:%02x.%d %04x:%04x, size %d\n",
vhdr->PCIBus, vhdr->PCIDevice, vhdr->PCIFunction,
vhdr->VendorID, vhdr->DeviceID, vhdr->ImageLength);
if (vhdr->PCIBus != rdev->pdev->bus->number ||
vhdr->PCIDevice != PCI_SLOT(rdev->pdev->devfn) ||
vhdr->PCIFunction != PCI_FUNC(rdev->pdev->devfn) ||
vhdr->VendorID != rdev->pdev->vendor ||
vhdr->DeviceID != rdev->pdev->device) {
DRM_INFO("ACPI VFCT table is not for this card\n");
goto out_unmap;
};
if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) + vhdr->ImageLength > tbl_size) {
DRM_ERROR("ACPI VFCT image truncated\n");
goto out_unmap;
}
rdev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL);
ret = !!rdev->bios;
out_unmap:
/* uh, no idea what to do here... */
return ret;
}
#else
static inline bool radeon_acpi_vfct_bios(struct radeon_device *rdev)
{
return false;
}
#endif
bool radeon_get_bios(struct radeon_device *rdev)
{
@ -483,6 +541,8 @@ bool radeon_get_bios(struct radeon_device *rdev)
uint16_t tmp;
r = radeon_atrm_get_bios(rdev);
if (r == false)
r = radeon_acpi_vfct_bios(rdev);
if (r == false)
r = igp_read_bios_from_vram(rdev);
if (r == false)