gpu: nvgpu: Fix Gpu sysfs access to Fmax@Vmin

Currently gpu sysfs retrieves Fmax@Vmin by direct call into Tegra DVFS
driver that introduces compile time dependencies on CONFIG_TEGRA_DVFS.
In addition incorrect clock is used for DVFS information access.

Re-factored sysfs node to use generic GPU clock operation for Fmax@Vmin
read. This would fix a bug in target clock selection, and allows to
remove dependency of sysfs on CONFIG_TEGRA_DVFS.

Updated nvgpu_linux_get_fmax_at_vmin_safe operation itself so it can be
called on platforms that does not support Tegra DVFS, although 0 will
still be returned as Fmax@Vmin on such platforms.

Bug 2045903

Change-Id: I32cce25320df026288c82458c913b0cde9ad4f72
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1710924
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/clk_gm20b.c b/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
index fb89752a..223166d1 100644
--- a/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/clk_gm20b.c
@@ -1197,7 +1197,7 @@ int gm20b_init_clk_setup_sw(struct gk20a *g)
                 goto fail;
         }
 
-        safe_rate = g->ops.clk.get_fmax_at_vmin_safe(clk);
+        safe_rate = g->ops.clk.get_fmax_at_vmin_safe(g);
         safe_rate = safe_rate * (100 - DVFS_SAFE_MARGIN) / 100;
         clk->dvfs_safe_max_freq = rate_gpu_to_gpc2clk(safe_rate);
         clk->gpc_pll.PL = (clk->dvfs_safe_max_freq == 0) ? 0 :