linux-kernel - [PATCH 3.14 003/228] MIPS/loongson2_cpufreq: Fix CPU clock rate setting

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Date:	Wed,  4 Jun 2014 16:20:32 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Aaro Koskinen <aaro.koskinen@....fi>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-mips@...ux-mips.org, cpufreq@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 3.14 003/228] MIPS/loongson2_cpufreq: Fix CPU clock rate setting

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Aaro Koskinen <aaro.koskinen@....fi>

commit 8e8acb32960f42c81b1d50deac56a2c07bb6a18a upstream.

Loongson2 has been using (incorrectly) kHz for cpu_clk rate. This has
been unnoticed, as loongson2_cpufreq was the only place where the rate
was set/get. After commit 652ed95d5fa6074b3c4ea245deb0691f1acb6656
(cpufreq: introduce cpufreq_generic_get() routine) things however broke,
and now loops_per_jiffy adjustments are incorrect (1000 times too long).
The patch fixes this by changing cpu_clk rate to Hz.

Signed-off-by: Aaro Koskinen <aaro.koskinen@....fi>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Cc: cpufreq@...r.kernel.org
Cc: Aaro Koskinen <aaro.koskinen@....fi>
Patchwork: https://patchwork.linux-mips.org/patch/6678/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/loongson/lemote-2f/clock.c |    5 +++--
 drivers/cpufreq/loongson2_cpufreq.c  |    4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

--- a/arch/mips/loongson/lemote-2f/clock.c
+++ b/arch/mips/loongson/lemote-2f/clock.c
@@ -91,6 +91,7 @@ EXPORT_SYMBOL(clk_put);
 
 int clk_set_rate(struct clk *clk, unsigned long rate)
 {
+	unsigned int rate_khz = rate / 1000;
 	int ret = 0;
 	int regval;
 	int i;
@@ -111,10 +112,10 @@ int clk_set_rate(struct clk *clk, unsign
 		if (loongson2_clockmod_table[i].frequency ==
 		    CPUFREQ_ENTRY_INVALID)
 			continue;
-		if (rate == loongson2_clockmod_table[i].frequency)
+		if (rate_khz == loongson2_clockmod_table[i].frequency)
 			break;
 	}
-	if (rate != loongson2_clockmod_table[i].frequency)
+	if (rate_khz != loongson2_clockmod_table[i].frequency)
 		return -ENOTSUPP;
 
 	clk->rate = rate;
--- a/drivers/cpufreq/loongson2_cpufreq.c
+++ b/drivers/cpufreq/loongson2_cpufreq.c
@@ -62,7 +62,7 @@ static int loongson2_cpufreq_target(stru
 	set_cpus_allowed_ptr(current, &cpus_allowed);
 
 	/* setting the cpu frequency */
-	clk_set_rate(policy->clk, freq);
+	clk_set_rate(policy->clk, freq * 1000);
 
 	return 0;
 }
@@ -92,7 +92,7 @@ static int loongson2_cpufreq_cpu_init(st
 	     i++)
 		loongson2_clockmod_table[i].frequency = (rate * i) / 8;
 
-	ret = clk_set_rate(cpuclk, rate);
+	ret = clk_set_rate(cpuclk, rate * 1000);
 	if (ret) {
 		clk_put(cpuclk);
 		return ret;


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