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drm/nouveau/device: detect if changing endianness failed

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v2: relax the checks a little

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Karol Herbst 2020-04-28 18:54:03 +02:00 committed by Ben Skeggs
parent 24d5ff40a7
commit 51c05340e4
1 changed files with 21 additions and 5 deletions
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26
drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
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@ -2924,6 +2924,20 @@ nvkm_device_del(struct nvkm_device **pdevice)
}
}
static inline bool
nvkm_device_endianness(void __iomem *pri)
{
u32 boot1 = ioread32_native(pri + 0x000004) & 0x01000001;
#ifdef __BIG_ENDIAN
if (!boot1)
return false;
#else
if (boot1)
return false;
#endif
return true;
}
int
nvkm_device_ctor(const struct nvkm_device_func *func,
const struct nvkm_device_quirk *quirk,
@ -2973,13 +2987,15 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
/* identify the chipset, and determine classes of subdev/engines */
if (detect) {
/* switch mmio to cpu's native endianness */
#ifndef __BIG_ENDIAN
if (ioread32_native(map + 0x000004) != 0x00000000) {
#else
if (ioread32_native(map + 0x000004) == 0x00000000) {
#endif
if (!nvkm_device_endianness(map)) {
iowrite32_native(0x01000001, map + 0x000004);
ioread32_native(map);
if (!nvkm_device_endianness(map)) {
nvdev_error(device,
"GPU not supported on big-endian\n");
ret = -ENOSYS;
goto done;
}
}
/* read boot0 and strapping information */