diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index fc404f7..4f889da 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -654,6 +654,12 @@ nv50_pll_set(struct drm_device *dev, uint32_t reg, uint32_t clk)
 	if (!clk)
 		return -ERANGE;
 
+	if (reg == 0x4008) {
+		reg0 &= 0xfe07ffff;
+		reg0 |= pll_limits.log2p_bias << 19;
+		reg0 |= pll.log2P << 22;
+	}
+
 	reg0 = (reg0 & 0xfff8ffff) | (pll.log2P << 16);
 	reg1 = (reg1 & 0xffff0000) | (pll.N1 << 8) | pll.M1;