2 files changed, 13 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/clk_gk20a.h b/drivers/gpu/nvgpu/gk20a/clk_gk20a.h
index eb9ce069..f07efa40 100644
--- a/drivers/gpu/nvgpu/gk20a/clk_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/clk_gk20a.h
@@ -96,6 +96,7 @@ struct clk_gk20a {
         bool sw_ready;
         bool clk_hw_on;
         bool debugfs_set;
+        int pll_poweron_uv;
 };
 
 #if defined(CONFIG_COMMON_CLK)
diff --git a/drivers/gpu/nvgpu/gm20b/clk_gm20b.c b/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
index 8156fa00..96a8a5bc 100644
--- a/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
@@ -48,7 +48,8 @@
 #define DFS_EXT_CAL_EN  BIT(9)
 #define DFS_EXT_STROBE  BIT(16)
 
-#define BOOT_GPU_UV     1000000 /* gpu rail boot voltage 1.0V */
+#define BOOT_GPU_UV_B1  1000000 /* gpu rail boot voltage 1.0V */
+#define BOOT_GPU_UV_C1  800000  /* gpu rail boot voltage 0.8V */
 #define ADC_SLOPE_UV    10000   /* default ADC detection slope 10mV */
 
 #define DVFS_SAFE_MARGIN        10      /* 10% */
@@ -558,7 +559,7 @@ static int clk_enbale_pll_dvfs(struct gk20a *g)
 
         data = gk20a_readl(g, trim_sys_gpcpll_cfg3_r());
         data = trim_sys_gpcpll_cfg3_dfs_testout_v(data);
-        p->uvdet_offs = BOOT_GPU_UV - data * ADC_SLOPE_UV;
+        p->uvdet_offs = g->clk.pll_poweron_uv - data * ADC_SLOPE_UV;
         p->uvdet_slope = ADC_SLOPE_UV;
         return 0;
 }
@@ -1154,8 +1155,15 @@ static int gm20b_init_clk_setup_sw(struct gk20a *g)
                 return 0;
         }
 
-        gpc_pll_params = (clk->gpc_pll.id == GM20B_GPC_PLL_C1) ?
-                gpc_pll_params_c1 : gpc_pll_params_b1;
+        if (clk->gpc_pll.id == GM20B_GPC_PLL_C1) {
+                gpc_pll_params = gpc_pll_params_c1;
+                if (!clk->pll_poweron_uv)
+                        clk->pll_poweron_uv = BOOT_GPU_UV_C1;
+        } else {
+                gpc_pll_params = gpc_pll_params_b1;
+                if (!clk->pll_poweron_uv)
+                        clk->pll_poweron_uv = BOOT_GPU_UV_B1;
+        }
 
         if (!gk20a_clk_get(g)) {
                 err = -EINVAL;