diff options
Diffstat (limited to '0001-device-detect-if-changing-endianness-failed.patch')
| -rw-r--r-- | 0001-device-detect-if-changing-endianness-failed.patch | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/0001-device-detect-if-changing-endianness-failed.patch b/0001-device-detect-if-changing-endianness-failed.patch new file mode 100644 index 000000000..1089b7e87 --- /dev/null +++ b/0001-device-detect-if-changing-endianness-failed.patch @@ -0,0 +1,62 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Karol Herbst <kherbst@redhat.com> +Date: Tue, 28 Apr 2020 18:54:03 +0200 +Subject: [PATCH] device: detect if changing endianness failed + +v2: relax the checks a little + +Signed-off-by: Karol Herbst <kherbst@redhat.com> +Signed-off-by: Ben Skeggs <bskeggs@redhat.com> +--- + .../gpu/drm/nouveau/nvkm/engine/device/base.c | 26 +++++++++++++++---- + 1 file changed, 21 insertions(+), 5 deletions(-) + +diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c +index 37589f36546d..c732074bf790 100644 +--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c ++++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c +@@ -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 */ +-- +2.26.2 + |