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thermal: cpu_cooling: check for the readiness of cpufreq layer 

In this patch, the cpu_cooling code checks for the usability of cpufreq
layer before proceeding with the CPU cooling device registration. The
main reason is: CPU cooling device is not usable if cpufreq cannot
switch frequencies.

Similar checks are spread in thermal drivers. Thus, the advantage now
is to have the check in a single place: cpu cooling device registration.
For this reason, this patch also updates the existing drivers that
depend on CPU cooling to simply propagate the error code of the cpu
cooling registration call. Therefore, in case cpufreq is not ready, the
thermal drivers will still return -EPROBE_DEFER, in an attempt to try
again when cpufreq layer gets ready.

Cc: devicetree@vger.kernel.org
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
hifive-unleashed-5.1
Eduardo Valentin 2014-12-04 09:41:43 +05:30
parent 8891063871
commit 0f1be51c35
6 changed files with 14 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/thermal/cpu_cooling.c
View File

@ -443,6 +443,11 @@ __cpufreq_cooling_register(struct device_node *np,
int ret = 0, i;
struct cpufreq_policy policy;
if (!cpufreq_frequency_get_table(cpumask_first(clip_cpus))) {
pr_debug("%s: CPUFreq table not found\n", __func__);
return ERR_PTR(-EPROBE_DEFER);
}
/* Verify that all the clip cpus have same freq_min, freq_max limit */
for_each_cpu(i, clip_cpus) {
/* continue if cpufreq policy not found and not return error */

5
drivers/thermal/db8500_cpufreq_cooling.c
View File

@ -18,7 +18,6 @@
*/
#include <linux/cpu_cooling.h>
#include <linux/cpufreq.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
@ -30,10 +29,6 @@ static int db8500_cpufreq_cooling_probe(struct platform_device *pdev)
struct thermal_cooling_device *cdev;
struct cpumask mask_val;
/* make sure cpufreq driver has been initialized */
if (!cpufreq_frequency_get_table(0))
return -EPROBE_DEFER;
cpumask_set_cpu(0, &mask_val);
cdev = cpufreq_cooling_register(&mask_val);

5
drivers/thermal/imx_thermal.c
View File

@ -9,7 +9,6 @@
#include <linux/clk.h>
#include <linux/cpu_cooling.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
@ -459,10 +458,6 @@ static int imx_thermal_probe(struct platform_device *pdev)
int measure_freq;
int ret;
if (!cpufreq_get_current_driver()) {
dev_dbg(&pdev->dev, "no cpufreq driver!");
return -EPROBE_DEFER;
}
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;

8
drivers/thermal/samsung/exynos_thermal_common.c
View File

@ -371,9 +371,11 @@ int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
th_zone->cool_dev[th_zone->cool_dev_size] =
cpufreq_cooling_register(&mask_val);
if (IS_ERR(th_zone->cool_dev[th_zone->cool_dev_size])) {
dev_err(sensor_conf->dev,
"Failed to register cpufreq cooling device\n");
ret = -EINVAL;
ret = PTR_ERR(th_zone->cool_dev[th_zone->cool_dev_size]);
if (ret != -EPROBE_DEFER)
dev_err(sensor_conf->dev,
"Failed to register cpufreq cooling device: %d\n",
ret);
goto err_unregister;
}
th_zone->cool_dev_size++;

5
drivers/thermal/samsung/exynos_tmu.c
View File

@ -683,7 +683,10 @@ static int exynos_tmu_probe(struct platform_device *pdev)
/* Register the sensor with thermal management interface */
ret = exynos_register_thermal(sensor_conf);
if (ret) {
dev_err(&pdev->dev, "Failed to register thermal interface\n");
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev,
"Failed to register thermal interface: %d\n",
ret);
goto err_clk;
}
data->reg_conf = sensor_conf;

6
drivers/thermal/ti-soc-thermal/ti-thermal-common.c
View File

@ -28,7 +28,6 @@
#include <linux/kernel.h>
#include <linux/workqueue.h>
#include <linux/thermal.h>
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/cpu_cooling.h>
#include <linux/of.h>
@ -403,11 +402,6 @@ int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
if (!data)
return -EINVAL;
if (!cpufreq_get_current_driver()) {
dev_dbg(bgp->dev, "no cpufreq driver yet\n");
return -EPROBE_DEFER;
}
/* Register cooling device */
data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
if (IS_ERR(data->cool_dev)) {