drm/nouveau/clk/gk20a: factorize n_lo computation code

Use a dedicated function instead of always calculating n_lo on the fly.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a.c
index a95eda7..cc46e3a 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a.c
@@ -160,6 +160,13 @@ gk20a_pllg_calc_rate(struct gk20a_clk *clk, struct gk20a_pll *pll)
        return rate / divider / 2;
 }
 
+static u32
+gk20a_pllg_n_lo(struct gk20a_clk *clk, struct gk20a_pll *pll)
+{
+       return DIV_ROUND_UP(pll->m * clk->params->min_vco,
+                           clk->parent_rate / KHZ);
+}
+
 static int
 gk20a_pllg_calc_mnp(struct gk20a_clk *clk, unsigned long rate,
                    struct gk20a_pll *pll)
@@ -341,7 +348,6 @@ _gk20a_pllg_program_mnp(struct gk20a_clk *clk, struct gk20a_pll *pll,
        struct nvkm_device *device = subdev->device;
        u32 val, cfg;
        struct gk20a_pll old_pll;
-       u32 n_lo;
 
        /* get old coefficients */
        gk20a_pllg_read_mnp(clk, &old_pll);
@@ -357,10 +363,7 @@ _gk20a_pllg_program_mnp(struct gk20a_clk *clk, struct gk20a_pll *pll,
        if (allow_slide && (cfg & GPCPLL_CFG_ENABLE)) {
                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);
-
+               ret = gk20a_pllg_slide(clk, gk20a_pllg_n_lo(clk, &old_pll));
                if (ret)
                        return ret;
        }
@@ -391,8 +394,7 @@ _gk20a_pllg_program_mnp(struct gk20a_clk *clk, struct gk20a_pll *pll,
 
        old_pll = *pll;
        if (allow_slide)
-               old_pll.n = DIV_ROUND_UP(pll->m * clk->params->min_vco,
-                                        clk->parent_rate / KHZ);
+               old_pll.n = gk20a_pllg_n_lo(clk, pll);
        gk20a_pllg_write_mnp(clk, &old_pll);
 
        gk20a_pllg_enable(clk);
@@ -628,8 +630,7 @@ gk20a_clk_fini(struct nvkm_clk *base)
                u32 n_lo;
 
                gk20a_pllg_read_mnp(clk, &pll);
-               n_lo = DIV_ROUND_UP(pll.m * clk->params->min_vco,
-                                   clk->parent_rate / KHZ);
+               n_lo = gk20a_pllg_n_lo(clk, &pll);
                gk20a_pllg_slide(clk, n_lo);
        }