[Nouveau] [PATCH 08/16] clk/gk20a: only compute n_lo if needed

[Alexandre Courbot]

n_lo is used if we are going to slide. Compute it only if that condition
succeeds to avoid confusion about future usage of this computation.

Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
---
 drm/nouveau/nvkm/subdev/clk/gk20a.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drm/nouveau/nvkm/subdev/clk/gk20a.c b/drm/nouveau/nvkm/subdev/clk/gk20a.c
index 96cb72f..fb5852a 100644
--- a/drm/nouveau/nvkm/subdev/clk/gk20a.c
+++ b/drm/nouveau/nvkm/subdev/clk/gk20a.c
@@ -367,10 +367,12 @@ _gk20a_pllg_program_mnp(struct gk20a_clk *clk, bool allow_slide)
 	}
 
 	/* slide down to NDIV_LO */
-	n_lo = DIV_ROUND_UP(m_old * clk->params->min_vco,
-			    clk->parent_rate / KHZ);
 	if (allow_slide && (cfg & GPCPLL_CFG_ENABLE)) {
-		int ret = gk20a_pllg_slide(clk, n_lo);
+		int ret;
+
+		n_lo = DIV_ROUND_UP(old_pll.m * clk->params->min_vco,
+				    clk->parent_rate / KHZ);
+		ret = gk20a_pllg_slide(clk, n_lo);
 
 		if (ret)
 			return ret;
-- 
2.7.2