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Revert "gpu: nvgpu: cache gpu clk rate"

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This reverts commit e9a6d179a4 ("gpu: nvgpu: cache gpu clk rate")

 - Real clock rate doesn't always equal clock rate requested by caller
 - call of clk_set_rate() and update of cached_rate are not atomic
 - Real root cause for Bug 2051688 is in bpmp and gboost design


Bug 2538692

Change-Id: I9248e0c69e2271ed2d0070587db59afa6f8160f2
Signed-off-by: Peng Liu <pengliu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2109708
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Peng Liu
2019-03-13 10:30:54 -07:00
committed by mobile promotions
parent 1374fba039
commit cc70f89bb4
5 changed files with 5 additions and 24 deletions
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19
drivers/gpu/nvgpu/os/linux/clk.c
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@@ -1,7 +1,7 @@
/*
* Linux clock support
*
* Copyright (c) 2017-2018, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2017-2019, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -38,13 +38,9 @@ static unsigned long nvgpu_linux_clk_get_rate(struct gk20a *g, u32 api_domain)
switch (api_domain) {
case CTRL_CLK_DOMAIN_GPCCLK:
if (g->clk.tegra_clk)
ret = g->clk.cached_rate ?
g->clk.cached_rate :
clk_get_rate(g->clk.tegra_clk);
ret = clk_get_rate(g->clk.tegra_clk);
else
ret = platform->cached_rate ?
platform->cached_rate :
clk_get_rate(platform->clk[0]);
ret = clk_get_rate(platform->clk[0]);
break;
case CTRL_CLK_DOMAIN_PWRCLK:
ret = clk_get_rate(platform->clk[1]);
@@ -66,15 +62,10 @@ static int nvgpu_linux_clk_set_rate(struct gk20a *g,
switch (api_domain) {
case CTRL_CLK_DOMAIN_GPCCLK:
if (g->clk.tegra_clk) {
if (g->clk.tegra_clk)
ret = clk_set_rate(g->clk.tegra_clk, rate);
if (!ret)
g->clk.cached_rate = rate;
} else {
else
ret = clk_set_rate(platform->clk[0], rate);
if (!ret)
platform->cached_rate = rate;
}
break;
case CTRL_CLK_DOMAIN_PWRCLK:
ret = clk_set_rate(platform->clk[1], rate);