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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


  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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