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drm/nouveau/secboot: workaround bug when starting SEC2 firmware

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For some unknown reason the LS SEC2 firmware needs to be started twice
to operate. Detect and address that condition.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2017-02-16 15:13:49 +09:00 committed by Ben Skeggs
parent c5e1fef487
commit ec91cb0285
1 changed files with 33 additions and 0 deletions
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33
drivers/gpu/drm/nouveau/nvkm/subdev/secboot/acr_r352.c
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@ -26,6 +26,7 @@
#include <core/firmware.h>
#include <engine/falcon.h>
#include <subdev/mc.h>
#include <subdev/timer.h>
#include <subdev/pmu.h>
#include <core/msgqueue.h>
#include <engine/sec2.h>
@ -977,6 +978,7 @@ acr_r352_bootstrap(struct acr_r352 *acr, struct nvkm_secboot *sb)
{
const struct nvkm_subdev *subdev = &sb->subdev;
unsigned long managed_falcons = acr->base.managed_falcons;
u32 reg;
int falcon_id;
int ret;
@ -1025,6 +1027,37 @@ acr_r352_bootstrap(struct acr_r352 *acr, struct nvkm_secboot *sb)
/* Start LS firmware on boot falcon */
nvkm_falcon_start(sb->boot_falcon);
/*
* There is a bug where the LS firmware sometimes require to be started
* twice (this happens only on SEC). Detect and workaround that
* condition.
*
* Once started, the falcon will end up in STOPPED condition (bit 5)
* if successful, or in HALT condition (bit 4) if not.
*/
nvkm_msec(subdev->device, 1,
if ((reg = nvkm_rd32(subdev->device,
sb->boot_falcon->addr + 0x100)
& 0x30) != 0)
break;
);
if (reg & BIT(4)) {
nvkm_debug(subdev, "applying workaround for start bug...");
nvkm_falcon_start(sb->boot_falcon);
nvkm_msec(subdev->device, 1,
if ((reg = nvkm_rd32(subdev->device,
sb->boot_falcon->addr + 0x100)
& 0x30) != 0)
break;
);
if (reg & BIT(4)) {
nvkm_error(subdev, "%s failed to start\n",
nvkm_secboot_falcon_name[acr->base.boot_falcon]);
return -EINVAL;
}
}
nvkm_debug(subdev, "%s started\n",
nvkm_secboot_falcon_name[acr->base.boot_falcon]);