63 lines
1.8 KiB
Diff
63 lines
1.8 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Karol Herbst <kherbst@redhat.com>
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Date: Tue, 28 Apr 2020 18:54:03 +0200
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Subject: [PATCH] device: detect if changing endianness failed
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v2: relax the checks a little
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Signed-off-by: Karol Herbst <kherbst@redhat.com>
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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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---
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.../gpu/drm/nouveau/nvkm/engine/device/base.c | 26 +++++++++++++++----
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1 file changed, 21 insertions(+), 5 deletions(-)
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diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
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index 37589f36546d..c732074bf790 100644
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--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
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+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
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@@ -2924,6 +2924,20 @@ nvkm_device_del(struct nvkm_device **pdevice)
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}
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}
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+static inline bool
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+nvkm_device_endianness(void __iomem *pri)
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+{
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+ u32 boot1 = ioread32_native(pri + 0x000004) & 0x01000001;
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+#ifdef __BIG_ENDIAN
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+ if (!boot1)
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+ return false;
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+#else
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+ if (boot1)
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+ return false;
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+#endif
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+ return true;
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+}
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+
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int
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nvkm_device_ctor(const struct nvkm_device_func *func,
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const struct nvkm_device_quirk *quirk,
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@@ -2973,13 +2987,15 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
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/* identify the chipset, and determine classes of subdev/engines */
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if (detect) {
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/* switch mmio to cpu's native endianness */
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-#ifndef __BIG_ENDIAN
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- if (ioread32_native(map + 0x000004) != 0x00000000) {
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-#else
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- if (ioread32_native(map + 0x000004) == 0x00000000) {
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-#endif
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+ if (!nvkm_device_endianness(map)) {
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iowrite32_native(0x01000001, map + 0x000004);
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ioread32_native(map);
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+ if (!nvkm_device_endianness(map)) {
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+ nvdev_error(device,
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+ "GPU not supported on big-endian\n");
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+ ret = -ENOSYS;
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+ goto done;
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+ }
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}
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/* read boot0 and strapping information */
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--
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2.26.2
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