drm/nouveau/bios: require checksum to match for fast acpi shadow method

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/priv.h b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/priv.h
index 212800e..7d1d3c6 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/priv.h
@@ -12,6 +12,7 @@ struct nvbios_source {
        bool rw;
        bool ignore_checksum;
        bool no_pcir;
+       bool require_checksum;
 };
 
 int nvbios_extend(struct nvkm_bios *, u32 length);

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadow.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadow.c
index b2557e8..7deb81b 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadow.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadow.c
@@ -86,9 +86,12 @@ shadow_image(struct nvkm_bios *bios, int idx, u32 offset, struct shadow *mthd)
                    nvbios_checksum(&bios->data[image.base], image.size)) {
                        nvkm_debug(subdev, "%08x: checksum failed\n",
                                   image.base);
-                       if (mthd->func->rw)
+                       if (!mthd->func->require_checksum) {
+                               if (mthd->func->rw)
+                                       score += 1;
                                score += 1;
-                       score += 1;
+                       } else
+                               return 0;
                } else {
                        score += 3;
                }

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c
index 8fecb5f..06572f8 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c
@@ -99,6 +99,7 @@ nvbios_acpi_fast = {
        .init = acpi_init,
        .read = acpi_read_fast,
        .rw = false,
+       .require_checksum = true,
 };
 
 const struct nvbios_source