drm/nv50/pm: fix a typo in clock calculation

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv50_pm.c b/drivers/gpu/drm/nouveau/nv50_pm.c
index e7ff5ac..e025cae 100644
--- a/drivers/gpu/drm/nouveau/nv50_pm.c
+++ b/drivers/gpu/drm/nouveau/nv50_pm.c
@@ -295,7 +295,7 @@
 			case 0x00000800:
 				return read_clk(dev, clk_src_hclkm3d2) >> P;
 			case 0x00000c00:
-				return read_pll(dev, clk_src_mclk) >> P;
+				return read_clk(dev, clk_src_mclk) >> P;
 			}
 			break;
 		}