From: Soren Brinkmann <soren.brinkmann@xilinx.com>
To: Mike Turquette <mturquette@linaro.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>
Cc: "Russell King" <linux@arm.linux.org.uk>,
"Michal Simek" <michal.simek@xilinx.com>,
"Nicolas Ferre" <nicolas.ferre@atmel.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
cpufreq@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
"Soren Brinkmann" <soren.brinkmann@xilinx.com>
Subject: [PATCH 2/4] cpufreq: cpu0: Use clk_find_nearest_rate()
Date: Mon, 30 Jun 2014 09:56:34 -0700 [thread overview]
Message-ID: <1404147396-8041-3-git-send-email-soren.brinkmann@xilinx.com> (raw)
In-Reply-To: <1404147396-8041-1-git-send-email-soren.brinkmann@xilinx.com>
Round clock frequencies to the nearest possible frequency. Since the
OPPs as specified in DT and the CCF use different a resolution for clock
frequencies, the clk_round_rate() API may return unexpected results, due
to not mandating how rounding has to happen. The clk_find_nearest_rate()
API mitigates such issues and finds the appropriate frequency for
an OPP.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---
drivers/cpufreq/cpufreq-cpu0.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
index ee1ae303a07c..1650581f85b6 100644
--- a/drivers/cpufreq/cpufreq-cpu0.c
+++ b/drivers/cpufreq/cpufreq-cpu0.c
@@ -42,7 +42,8 @@ static int cpu0_set_target(struct cpufreq_policy *policy, unsigned int index)
long freq_Hz, freq_exact;
int ret;
- freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000);
+ freq_Hz = clk_find_nearest_rate(cpu_clk,
+ freq_table[index].frequency * 1000);
if (freq_Hz <= 0)
freq_Hz = freq_table[index].frequency * 1000;
--
2.0.1.1.gfbfc394
next prev parent reply other threads:[~2014-06-30 16:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-30 16:56 [PATCH 0/4] Introduce clk_find_nearest_rate() Soren Brinkmann
2014-06-30 16:56 ` [PATCH 1/4] clk: Introduce 'clk_find_nearest_rate()' Soren Brinkmann
2014-06-30 19:27 ` Boris BREZILLON
2014-07-01 0:12 ` Sören Brinkmann
2014-07-01 6:32 ` Boris BREZILLON
2014-07-01 7:18 ` Boris BREZILLON
2014-07-01 8:23 ` Uwe Kleine-König
2014-07-01 17:52 ` Sören Brinkmann
2014-06-30 16:56 ` Soren Brinkmann [this message]
2014-06-30 16:56 ` [PATCH 3/4] net: macb: Use clk_find_nearest_rate() API Soren Brinkmann
2014-06-30 16:56 ` [PATCH 4/4] ARM: zynq: dt: Use properly rounded frequencies in OPPs Soren Brinkmann
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