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devfreq: compare previous_freq only if podgov disabled

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In update_devfreq(), we currently get target frequency,
compare it with previous_freq, and set it only if
new freq is different one

But get_target_freq() (nvhost_pod_estimate_freq())
already takes care of such cases in normal conditions
Hence, remove the check with previous_freq in
update_devfreq()

For case when we disable podgov governor, we might still end
up setting max freq all the time
Hence, add a check on previous_freq, and if previous_freq
is already max, do not set it

Bug 200175874
Bug 200161377

Change-Id: I287d37c07ee6214ed48612482211ce0f45088ca4
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1111437
Reviewed-on: http://git-master/r/1113417
(cherry picked from linux-4.9 commit 9c424ce31bedac5db0c2d93e083f20ea89ed1836)
Reviewed-on: https://git-master.nvidia.com/r/1770136
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Timo Alho <talho@nvidia.com>
Tested-by: Timo Alho <talho@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Deepak Nibade
2016-03-16 15:52:20 +05:30
committed by Laxman Dewangan
parent fbde18a19c
commit b69d69ec4d
1 changed files with 5 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/devfreq/governor_pod_scaling.c
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@@ -3,7 +3,7 @@
*
* Tegra Graphics Host 3D clock scaling
*
* Copyright (c) 2012-2015, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2012-2016, 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,
@@ -732,6 +732,9 @@ static int nvhost_pod_estimate_freq(struct devfreq *df,
/* Ensure maximal clock when scaling is disabled */
if (!podgov->enable) {
*freq = df->max_freq;
if (*freq == df->previous_freq)
return GET_TARGET_FREQ_DONTSCALE;
else
return 0;
}