At least Apple's MacBook Pro 8,2 booting EFI -> GRUB2 -> Linux (without BIOS emulation) seems to have no Radeon BIOS accessible via conventional means. Loading one via firmware system previously dumped (with "dd if=/dev/mem of=/lib/firmware/radeon/vbios.bin bs=65536 skip=12 count=1") when booted with BIOS emulation works. I carry this patch around since about 3.8 and never had any problems, not even with several dozen cycles of suspend2ram and resume. Also, I tested every new release if this patch was still necessary, and it always was.
Thanks to Stefan Dösinger and others at https://www.libreoffice.org/bugzilla/show_bug.cgi?id=26891
Signed-off-by: Wilfried Klaebe w-lkml@lebenslange-mailadresse.de
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diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c index 63ccb8f..cf55e0e 100644 --- a/drivers/gpu/drm/radeon/radeon_bios.c +++ b/drivers/gpu/drm/radeon/radeon_bios.c @@ -29,6 +29,7 @@ #include "radeon_reg.h" #include "radeon.h" #include "atom.h" +#include <linux/firmware.h>
#include <linux/vga_switcheroo.h> #include <linux/slab.h> @@ -74,6 +75,44 @@ static bool igp_read_bios_from_vram(struct radeon_device *rdev) return true; }
+static bool radeon_read_bios_from_firmware(struct radeon_device *rdev) +{ + const uint8_t __iomem *bios; + resource_size_t size; + const struct firmware *fw = NULL; + char *err = NULL; + + request_firmware(&fw, "radeon/vbios.bin", rdev->dev); + if (!fw) { + err = "firmware request returned NULL\n"; + goto out; + } + size = fw->size; + bios = fw->data; + + if (size == 0 || !bios) { + err = "firmware request returned zero sized or NULL data\n"; + goto out; + } + + if (bios[0] != 0x55 || bios[1] != 0xaa) { + err = "wrong signature on firmware\n"; + goto out; + } + rdev->bios = kmalloc(size, GFP_KERNEL); + if (rdev->bios == NULL) { + err = "failed to kmalloc() memory for firmware\n"; + goto out; + } + memcpy(rdev->bios, bios, size); +out: + if (err) + DRM_ERROR(err); + if (fw) + release_firmware(fw); + return !err; +} + static bool radeon_read_bios(struct radeon_device *rdev) { uint8_t __iomem *bios; @@ -662,6 +701,8 @@ bool radeon_get_bios(struct radeon_device *rdev) r = radeon_read_disabled_bios(rdev); if (r == false) r = radeon_read_platform_bios(rdev); + if (r == false) + r = radeon_read_bios_from_firmware(rdev); if (r == false || rdev->bios == NULL) { DRM_ERROR("Unable to locate a BIOS ROM\n"); rdev->bios = NULL;