On Mon, Aug 8, 2011 at 12:21 PM, Matthew Garrett <mjg at redhat.com> 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 at redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> ---
> ?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
>
>
