linux/drivers/devfreq, branch v5.8

PM / devfreq: Use lockdep asserts instead of manual checks for locked mutex

2020-05-28T09:02:40Z

Instead of warning when mutex_is_locked(), just use the lockdep framework. The code is smaller and checks could be disabled for production environments (it is useful only during development). Put asserts at beginning of function, even before validating arguments. The behavior of update_devfreq() is now changed because lockdep assert will only print a warning, not return with EINVAL. Signed-off-by: Krzysztof Kozlowski Signed-off-by: Chanwoo Choi

PM / devfreq: imx-bus: Fix inconsistent IS_ERR and PTR_ERR

2020-05-28T09:02:40Z

Fix inconsistent IS_ERR and PTR_ERR in imx_bus_init_icc(). The proper pointer to be passed as argument to PTR_ERR() is priv->icc_pdev. This bug was detected with the help of Coccinelle. Fixes: 16c1d2f1b0bd ("PM / devfreq: imx: Register interconnect device") Signed-off-by: Gustavo A. R. Silva Reviewed-by: Dong Aisheng [cw00.choi: Edit the patch title from 'imx' to 'imx-bus'] Signed-off-by: Chanwoo Choi

PM / devfreq: Replace strncpy with strscpy

2020-05-28T09:02:39Z

GCC produces this warning when kernel compiled using `make W=1`: warning: ‘strncpy’ specified bound 16 equals destination size [-Wstringop-truncation] 772 | strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); The strncpy doesn't take care of NULL-termination of the destination buffer, while the strscpy does. Signed-off-by: Dmitry Osipenko Signed-off-by: Chanwoo Choi

PM / devfreq: imx: Register interconnect device

2020-05-28T09:02:39Z

There is no single device which can represent the imx interconnect. Instead of adding a virtual one just make the main &noc act as the global interconnect provider. The imx interconnect provider driver will scale the NOC and DDRC based on bandwidth request. More scalable nodes can be added in the future, for example for audio/display/vpu/gpu NICs. Signed-off-by: Leonard Crestez Tested-by: Martin Kepplinger Acked-by: Chanwoo Choi Signed-off-by: Chanwoo Choi

PM / devfreq: Add generic imx bus scaling driver

2020-05-28T09:02:39Z

Add initial support for dynamic frequency switching on pieces of the imx interconnect fabric. All this driver does is set a clk rate based on an opp table, it does not map register areas. Signed-off-by: Leonard Crestez Tested-by: Martin Kepplinger Acked-by: Chanwoo Choi Signed-off-by: Chanwoo Choi

PM / devfreq: tegra30: Delete an error message in tegra_devfreq_probe()

2020-05-28T09:02:39Z

The function “platform_get_irq” can log an error already. Thus omit a redundant message for the exception handling in the calling function. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring Reviewed-by: Dmitry Osipenko Signed-off-by: Chanwoo Choi

PM / devfreq: tegra30: Make CPUFreq notifier to take into account boosting

2020-05-28T09:02:39Z

We're taking into account both HW memory-accesses + CPU activity based on current CPU's frequency. For memory-accesses there is a kind of hysteresis in a form of "boosting" which is managed by the tegra30-devfreq driver. If current HW memory activity is higher than activity judged based of the CPU's frequency, then there is no need to schedule cpufreq_update_work because the result of the work will be a NO-OP. And thus, tegra_actmon_cpufreq_contribution() should return 0, meaning that at the moment CPU frequency doesn't contribute anything to the final decision about required memory clock rate. Signed-off-by: Dmitry Osipenko Signed-off-by: Chanwoo Choi

PM / devfreq: Fix handling dev_pm_qos_remove_request result

2020-03-24T23:35:03Z

The dev_pm_qos_remove_request function can return 1 if "aggregated constraint value has changed" so only negative values should be reported as errors. Fixes: 27dbc542f651 ("PM / devfreq: Use PM QoS for sysfs min/max_freq") Reported-by: Dan Carpenter Signed-off-by: Leonard Crestez Signed-off-by: Chanwoo Choi

PM / devfreq: Fix a typo in a comment

2020-03-24T23:35:03Z

'govenror' was used in place of 'governor' Signed-off-by: Christophe JAILLET Signed-off-by: Chanwoo Choi

PM / devfreq: Change to DEVFREQ_GOV_UPDATE_INTERVAL event name

2020-03-24T23:35:03Z

DEVFREQ_GOV_INTERVAL event indicates that update the interval for polling mode of devfreq device. But, this event name doesn't specify exactly what to do. Change DEVFREQ_GOV_INTERVAL event name to DEVFREQ_GOV_UPDATE_INTERVAL which specifies what to do by event name. And modify the function name to DEVFREQ_GOV_UPDATE_INTERVAL with 'devfreq_' prefix + verb + object as following: - devfreq_interval_update -> devfreq_updatee_interval Reviewed-by: Lukasz Luba Signed-off-by: Chanwoo Choi