From: Francisco Jerez <currojerez@riseup.net>
Date: Sat, 10 Jul 2010 16:10:59 +0000 (+0200)
Subject: drm/nouveau: Disable PROM access on init.
X-Git-Tag: v2.6.36-rc3~9^2~78^2~33
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=112d20ad5ca06a9ec7237602ee33bef6fa881daa;p=platform%2Fkernel%2Flinux-3.10.git

drm/nouveau: Disable PROM access on init.

On older cards (<nv17) scanout gets blocked when the ROM is being
accessed. PROM access usually comes out enabled from suspend, switch
it off.

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

diff --git a/drivers/gpu/drm/nouveau/nv04_mc.c b/drivers/gpu/drm/nouveau/nv04_mc.c
index 617ed1e..2af43a1 100644
--- a/drivers/gpu/drm/nouveau/nv04_mc.c
+++ b/drivers/gpu/drm/nouveau/nv04_mc.c
@@ -11,6 +11,10 @@ nv04_mc_init(struct drm_device *dev)
 	 */
 
 	nv_wr32(dev, NV03_PMC_ENABLE, 0xFFFFFFFF);
+
+	/* Disable PROM access. */
+	nv_wr32(dev, NV_PBUS_PCI_NV_20, NV_PBUS_PCI_NV_20_ROM_SHADOW_ENABLED);
+
 	return 0;
 }