drm/nouveau: Fix suspend on some nv4x AGP cards.

On some nv4x cards (specifically, the ones that use an internal
PCIE->AGP bridge) the AGP controller state isn't preserved after a
suspend/resume cycle, and the AGP control registers have moved from
0x18xx to 0x100xx, so the FW check in nouveau_mem_reset_agp() doesn't
quite work. Check "dev->agp->mode" instead.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_mem.c b/drivers/gpu/drm/nouveau/nouveau_mem.c
index 9689d41..c14466b 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_mem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_mem.c
@@ -355,7 +355,8 @@ nouveau_mem_reset_agp(struct drm_device *dev)
        /* First of all, disable fast writes, otherwise if it's
         * already enabled in the AGP bridge and we disable the card's
         * AGP controller we might be locking ourselves out of it. */
-       if (nv_rd32(dev, NV04_PBUS_PCI_NV_19) & PCI_AGP_COMMAND_FW) {
+       if ((nv_rd32(dev, NV04_PBUS_PCI_NV_19) |
+            dev->agp->mode) & PCI_AGP_COMMAND_FW) {
                struct drm_agp_info info;
                struct drm_agp_mode mode;