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radeon: Attempt to use platform-provided ROM image 

Some platforms only provide their PCI ROM via a platform-specific interface.
Fall back to attempting that if all other sources fail.

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Matthew Garrett 2013-03-26 17:25:56 -04:00 committed by Bjorn Helgaas
parent 121cdf08cc
commit 06a0857008
1 changed files with 26 additions and 0 deletions
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26
drivers/gpu/drm/radeon/radeon_bios.c
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@ -99,6 +99,29 @@ static bool radeon_read_bios(struct radeon_device *rdev)
return true;
}
static bool radeon_read_platform_bios(struct radeon_device *rdev)
{
uint8_t __iomem *bios;
size_t size;
rdev->bios = NULL;
bios = pci_platform_rom(rdev->pdev, &size);
if (!bios) {
return false;
}
if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
return false;
}
rdev->bios = kmemdup(bios, size, GFP_KERNEL);
if (rdev->bios == NULL) {
return false;
}
return true;
}
#ifdef CONFIG_ACPI
/* ATRM is used to get the BIOS on the discrete cards in
* dual-gpu systems.
@ -620,6 +643,9 @@ bool radeon_get_bios(struct radeon_device *rdev)
if (r == false) {
r = radeon_read_disabled_bios(rdev);
}
if (r == false) {
r = radeon_read_platform_bios(rdev);
}
if (r == false || rdev->bios == NULL) {
DRM_ERROR("Unable to locate a BIOS ROM\n");
rdev->bios = NULL;