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Commit de2b8b8b authored by Ben Skeggs's avatar Ben Skeggs
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drm/nouveau/bios: attempt to fetch entire acpi rom image in one shot 



v2: fdo#55948 - the _ROM method silently truncates size to 4KiB, perform
    a checksum test and fall back to slow _ROM access on failure.

Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent 28164fda

drivers/gpu/drm/nouveau/core/subdev/bios/base.c

+13 −5
Original line number Diff line number Diff line
@@ -210,13 +210,21 @@ nouveau_bios_shadow_acpi(struct nouveau_bios *bios) 
		return;



	bios->data = kmalloc(bios->size, GFP_KERNEL);

	for (i = 0; bios->data && i < bios->size; i += cnt) {

	if (bios->data) {

		/* disobey the acpi spec - much faster on at least w530 ... */

		ret = nouveau_acpi_get_bios_chunk(bios->data, 0, bios->size);

		if (ret != bios->size ||

		    nvbios_checksum(bios->data, bios->size)) {

			/* ... that didn't work, ok, i'll be good now */

			for (i = 0; i < bios->size; i += cnt) {

				cnt = min((bios->size - i), (u32)4096);

				ret = nouveau_acpi_get_bios_chunk(bios->data, i, cnt);

				if (ret != cnt)

					break;

			}

		}

	}

}



static void

nouveau_bios_shadow_pci(struct nouveau_bios *bios)