gpu: nvgpu: gv11b: limit min freq to 216.75Mhz

Until issue related to low frequencies root caused,
limit min frequency to known safe value: 216.75Mhz.

This change needs to be reverted, once orginal issue
root-caused and fixed.

Bug 2051863
Bug 2056266

Change-Id: If6e56f59ee5fa06967fde1128b58a7fc97be74e9
Signed-off-by: seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1657595
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/platform_gp10b_tegra.c b/drivers/gpu/nvgpu/common/linux/platform_gp10b_tegra.c
index 2bca2bd5..fd3c3e2c 100644
--- a/drivers/gpu/nvgpu/common/linux/platform_gp10b_tegra.c
+++ b/drivers/gpu/nvgpu/common/linux/platform_gp10b_tegra.c
@@ -327,6 +327,16 @@ int gp10b_clk_get_freqs(struct device *dev,
         unsigned long max_rate;
         unsigned long new_rate = 0, prev_rate = 0;
         int i = 0, freq_counter = 0;
+        struct gk20a *g = get_gk20a(dev);
+
+        /*
+         * Limit minimum frequency to 216.75MHz for gv11b, until issue
+         * with lower frequencies are root caused - Bug 2056266
+         * This hack needs to be removed once actual issue got fixed
+         */
+
+        if ((g->params.gpu_arch + g->params.gpu_impl) == NVGPU_GPUID_GV11B)
+                new_rate = 216750000;
 
         max_rate = clk_round_rate(platform->clk[0], (UINT_MAX - 1));