drm/radeon/kms: check for valid PCI bios and not OF rom

stops us trying to treat a OF rom as a PCI rom.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index 9069217..26856ed 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -411,6 +411,12 @@ bool radeon_get_bios(struct radeon_device *rdev)
                goto free_bios;
        }
 
+       tmp = RBIOS16(0x18);
+       if (RBIOS8(tmp + 0x14) != 0x0) {
+               DRM_INFO("Not an x86 BIOS ROM, not using.\n");
+               goto free_bios;
+       }
+
        rdev->bios_header_start = RBIOS16(0x48);
        if (!rdev->bios_header_start) {
                goto free_bios;