drm/nv4c/bios: disallow retrieving from prom on nv4x igp's

Suggested-by: Marcin Kościelnicki <koriakin@0x04.net>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/base.c b/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
index aa0fbbec7f08212cd8b3106ecb57ec4ff491403b..ef0c9c4a8cc3925f9f8df1279417fc028a39f2f9 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
@@ -130,6 +130,10 @@ nouveau_bios_shadow_prom(struct nouveau_bios *bios)
        u16 pcir;
        int i;
 
+       /* there is no prom on nv4x IGP's */
+       if (device->card_type == NV_40 && device->chipset >= 0x4c)
+               return;
+
        /* enable access to rom */
        if (device->card_type >= NV_50)
                pcireg = 0x088050;