On Mon, Aug 8, 2011 at 12:21 PM, Matthew Garrett <mjg@xxxxxxxxxx> wrote:
> At least some Apples program the GPU into a state that wedges the engine
> once userspace starts trying to perform accelerated operations. Executing
> the Atom init scripts gets the hardware back into a working state. The
> same hardware works fine when booted via BIOS emulation, so let's just
> execute the init scripts on Apples when we're using EFI.
>
> Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/radeon/radeon_device.c | 4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
> index 440e6ec..a3b011b 100644
> --- a/drivers/gpu/drm/radeon/radeon_device.c
> +++ b/drivers/gpu/drm/radeon/radeon_device.c
> @@ -32,6 +32,7 @@
> #include <drm/radeon_drm.h>
> #include <linux/vgaarb.h>
> #include <linux/vga_switcheroo.h>
> +#include <linux/efi.h>
> #include "radeon_reg.h"
> #include "radeon.h"
> #include "atom.h"
> @@ -348,6 +349,9 @@ bool radeon_card_posted(struct radeon_device *rdev)
> {
> uint32_t reg;
>
> + if (efi_enabled && rdev->pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE)
> + return false;
> +
> /* first check CRTCs */
> if (ASIC_IS_DCE41(rdev)) {
> reg = RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC0_REGISTER_OFFSET) |
> --
> 1.7.6
>
>
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