From 9afb74dada5e318ec6b40ff4745e4d4adf8ee8b2 Mon Sep 17 00:00:00 2001 From: seshendra Gadagottu Date: Wed, 14 Feb 2018 11:55:49 -0800 Subject: 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 Reviewed-on: https://git-master.nvidia.com/r/1657595 Reviewed-by: mobile promotions Tested-by: mobile promotions --- drivers/gpu/nvgpu/common/linux/platform_gp10b_tegra.c | 10 ++++++++++ 1 file changed, 10 insertions(+) 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)); -- cgit v1.2.2