linux-kernel - [PATCH] cpufreq-dt: add suspend frequency support

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Date:	Wed, 02 Sep 2015 18:42:01 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Thomas Abraham <thomas.ab@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Michael Turquette <mturquette@...libre.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Kevin Hilman <khilman@...aro.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
	Anand Moon <linux.amoon@...il.com>,
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, b.zolnierkie@...sung.com
Subject: [PATCH] cpufreq-dt: add suspend frequency support

Add suspend frequency support and set it to the boot frequency,
this matches what the old exynos-cpufreq driver has been doing.

This patch fixes suspend/resume support on Exynos4412 based
Trats2 board and reboot hang on Exynos4412 based Odroid U3
board.

Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Thomas Abraham <thomas.ab@...sung.com>
Cc: Javier Martinez Canillas <javier@....samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
This patch supersedes "[PATCH] ARM: dts: exynos4412-odroid-*: add
workaround for CPUfreq/reboot issue" one from yesterday.

 drivers/cpufreq/cpufreq-dt.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index c3583cd..c9138c7 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -329,6 +329,10 @@ static int cpufreq_init(struct cpufreq_policy *policy)
 	policy->driver_data = priv;
 
 	policy->clk = cpu_clk;
+
+	/* capture boot frequency */
+	policy->suspend_freq = clk_get_rate(cpu_clk) / 1000;;
+
 	ret = cpufreq_table_validate_and_show(policy, freq_table);
 	if (ret) {
 		dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
@@ -419,6 +423,9 @@ static struct cpufreq_driver dt_cpufreq_driver = {
 	.ready = cpufreq_ready,
 	.name = "cpufreq-dt",
 	.attr = cpufreq_dt_attr,
+#ifdef CONFIG_PM
+	.suspend = cpufreq_generic_suspend,
+#endif
 };
 
 static int dt_cpufreq_probe(struct platform_device *pdev)
-- 
1.9.1

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