[PATCH] Patch for nvidia divide by zero error for 7600 pci-express card

The following patch resolves the divide by zero error I encountered on my
system:

	http://marc.10east.com/?l=linux-fbdev-devel&m=116058257024413&w=2

I accomplished this by merging what I thought was appropriate from:

	http://webcvs.freedesktop.org/xorg/driver/xf86-video-nv/src/

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/video/nvidia/nv_hw.c b/drivers/video/nvidia/nv_hw.c
index 9ed640d35728..ea426115c6f9 100644
--- a/drivers/video/nvidia/nv_hw.c
+++ b/drivers/video/nvidia/nv_hw.c
@@ -145,12 +145,18 @@ static void nvGetClocks(struct nvidia_par *par, unsigned int *MClk,
 
         if (par->Architecture >= NV_ARCH_40) {
                 pll = NV_RD32(par->PMC, 0x4020);
-                P = (pll >> 16) & 0x03;
+                P = (pll >> 16) & 0x07;
                 pll = NV_RD32(par->PMC, 0x4024);
                 M = pll & 0xFF;
                 N = (pll >> 8) & 0xFF;
-                MB = (pll >> 16) & 0xFF;
-                NB = (pll >> 24) & 0xFF;
+                if (((par->Chipset & 0xfff0) == 0x0290) ||
+                                ((par->Chipset & 0xfff0) == 0x0390)) {
+                        MB = 1;
+                        NB = 1;
+                } else {
+                        MB = (pll >> 16) & 0xFF;
+                        NB = (pll >> 24) & 0xFF;
+                }
                 *MClk = ((N * NB * par->CrystalFreqKHz) / (M * MB)) >> P;
 
                 pll = NV_RD32(par->PMC, 0x4000);