gpu: nvgpu: fix round_rate ops for CCF

Make round_rate return max freq when called with a value greater than
the max clock frequency.

Bug 200233943

Change-Id: Id128611f2d09b17a0a0edfefd4b526fd8c215bce
Signed-off-by: Srikar Srimath Tirumala <srikars@nvidia.com>
Reviewed-on: http://git-master/r/1272305
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com>
Tested-by: Jonathan Hunter <jonathanh@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-by: Shreshtha Sahu <ssahu@nvidia.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/clk_gm20b.c b/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
index 060a5775..b1ea7331 100644
--- a/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
@@ -1305,8 +1305,12 @@ static long gm20b_round_rate(struct clk_hw *hw, unsigned long rate,
 {
         struct clk_gk20a *clk = to_clk_gk20a(hw);
         u32 freq, old_freq;
+        unsigned long maxrate;
         struct pll tmp_pll;
 
+        maxrate = tegra_dvfs_get_maxrate(hw->clk);
+        gpc_pll_params.max_freq = rate_gpu_to_gpc2clk(maxrate);
+
         mutex_lock(&clk->clk_mutex);
         old_freq = clk->gpc_pll.freq;
         freq = rate_gpu_to_gpc2clk(rate);