diff options
| author | Alex Frid <afrid@nvidia.com> | 2013-11-15 23:16:06 -0800 |
|---|---|---|
| committer | Yu-Huan Hsu <yhsu@nvidia.com> | 2013-11-19 19:49:58 -0800 |
| commit | 4d194fc765cf6dbc96bc261880b7aaadd0e56d98 (patch) | |
| tree | bcad46e100dc6da90a445b94c46bebc4cff80688 /arch/arm/mach-tegra/clock.c | |
| parent | 9fa1be6e12d82bcc72c44d03c52ae7c6c8078798 (diff) | |
ARM: tegra: dvfs: Support persistent alt frequencies
Existing interface to dvfs alternative frequencies combined enable
control with alternative ladder installation. Hence, the only way to
switch back to primary frequencies was to de-install alternative ones.
This commit provided separate install and enable interfaces, so that
alternative ladder can be installed once, and then enabled/disabled
under client control. Also made sure alternative voltage-frequency
mapping results in lower voltage at the same frequency (this was an
implicit assumption of alternative frequencies support - now it is
enforced explicitly).
Bug 1397158
Change-Id: I4663602d1882f72156e02590f41ff04e7e69fbf8
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/333090
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra/clock.c')
| -rw-r--r-- | arch/arm/mach-tegra/clock.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c index 2678315877f5..ca18a8c65e5a 100644 --- a/arch/arm/mach-tegra/clock.c +++ b/arch/arm/mach-tegra/clock.c @@ -1694,6 +1694,20 @@ static const struct file_operations possible_rates_fops = { .release = single_release, }; +static int use_alt_freq_get(void *data, u64 *val) +{ + struct clk *c = (struct clk *)data; + *val = c->dvfs->use_alt_freqs; + return 0; +} +static int use_alt_freq_set(void *data, u64 val) +{ + struct clk *c = (struct clk *)data; + return tegra_dvfs_use_alt_freqs_on_clk(c, val); +} +DEFINE_SIMPLE_ATTRIBUTE(use_alt_freq_fops, + use_alt_freq_get, use_alt_freq_set, "%llu\n"); + static int clk_debugfs_register_one(struct clk *c) { struct dentry *d; @@ -1762,6 +1776,13 @@ static int clk_debugfs_register_one(struct clk *c) goto err_out; } + if (c->dvfs) { + d = debugfs_create_file("use_alt_freq", S_IRUGO | S_IWUSR, + c->dent, c, &use_alt_freq_fops); + if (!d) + goto err_out; + } + return 0; err_out: |