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authorViresh Kumar <viresh.kumar@linaro.org>2014-06-10 08:57:12 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-06-11 00:50:50 +0400
commit40cc5490132075d7be85a4483caa0a7264f45ed4 (patch)
tree736d05bc242ec8a07e9638c3ca0fb2ba8e28106e /drivers/cpufreq
parent830bcac4e483d347087ed51eed564d1467e1e363 (diff)
downloadlinux-40cc5490132075d7be85a4483caa0a7264f45ed4.tar.xz
cpufreq: tegra: update comment for clarity
Tegra's driver got updated a bit (00917dd cpufreq: Tegra: implement intermediate frequency callbacks) and implements new 'intermediate freq' infrastructure of core. Above commit updated comments about when to call clk_prepare_enable(pll_x_clk) and Doug wasn't satisfied with those comments and said this: > The "Though when target-freq is intermediate freq, we don't need to > take this reference." makes me think that this function is actually > called when target-freq is intermediate freq.  I don't think it is, > right? For better clarity just make that comment more explicit about when we call tegra_target_intermediate(). Reviewed-by: Stephen Warren <swarren@nvidia.com> Reported-and-reviewed-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/tegra-cpufreq.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/cpufreq/tegra-cpufreq.c b/drivers/cpufreq/tegra-cpufreq.c
index a5fbc0a8d897..8084c7f7e206 100644
--- a/drivers/cpufreq/tegra-cpufreq.c
+++ b/drivers/cpufreq/tegra-cpufreq.c
@@ -71,9 +71,12 @@ static int tegra_target_intermediate(struct cpufreq_policy *policy,
/*
* Take an extra reference to the main pll so it doesn't turn
* off when we move the cpu off of it as enabling it again while we
- * switch to it from tegra_target() would take additional time. Though
- * when target-freq is intermediate freq, we don't need to take this
- * reference.
+ * switch to it from tegra_target() would take additional time.
+ *
+ * When target-freq is equal to intermediate freq we don't need to
+ * switch to an intermediate freq and so this routine isn't called.
+ * Also, we wouldn't be using pll_x anymore and must not take extra
+ * reference to it, as it can be disabled now to save some power.
*/
clk_prepare_enable(pll_x_clk);