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SubjectRe: [PATCH 11/11] misc/throttler: Add Chrome OS EC throttler
Hi Enric,

thanks for the review!

I'll address your comments in the next revision.

On Thu, May 31, 2018 at 11:05:09AM +0200, Enric Balletbo Serra wrote:
> Hi Matthias,
>
> The patch looks good to me, just three minor comments to be more
> coherent with other cros-ec drivers.
>
> 2018-05-25 22:30 GMT+02:00 Matthias Kaehlcke <mka@chromium.org>:
> > The driver subscribes to throttling events from the Chrome OS
> > embedded controller and enables/disables system throttling based
> > on these events.
> >
> > Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
> > ---
> > drivers/misc/throttler/Kconfig | 15 +++
> > drivers/misc/throttler/Makefile | 1 +
> > drivers/misc/throttler/cros_ec_throttler.c | 122 +++++++++++++++++++++
> > 3 files changed, 138 insertions(+)
> > create mode 100644 drivers/misc/throttler/cros_ec_throttler.c
> >
> > diff --git a/drivers/misc/throttler/Kconfig b/drivers/misc/throttler/Kconfig
> > index ef8388f6bc0a..652b6817b75c 100644
> > --- a/drivers/misc/throttler/Kconfig
> > +++ b/drivers/misc/throttler/Kconfig
> > @@ -11,3 +11,18 @@ menuconfig THROTTLER
> > Note that you also need a event monitor module usually called
> > *_throttler.
> >
> > +if THROTTLER
> > +
> > +config CROS_EC_THROTTLER
> > + tristate "Throttler event monitor for the Chrome OS Embedded Controller"
>
> s/Chrome OS/ChromeOS/ This is how other cros-ec drivers refer to the
> embedded controller, so will be good if you could maintain this
> denomination.
>
> > + default n
> > + depends on MFD_CROS_EC
> > + ---help---
> > + This driver adds support to throttle the system in reaction to
> > + Chrome OS EC events.
> > +
>
> ditto
>
> > + To compile this driver as a module, choose M here: the
> > + module will be called cros_ec_throttler.
> > +
> > +endif # THROTTLER
> > +
> > diff --git a/drivers/misc/throttler/Makefile b/drivers/misc/throttler/Makefile
> > index c8d920cee315..d9b2a77dabc9 100644
> > --- a/drivers/misc/throttler/Makefile
> > +++ b/drivers/misc/throttler/Makefile
> > @@ -1 +1,2 @@
> > obj-$(CONFIG_THROTTLER) += core.o
> > +obj-$(CONFIG_CROS_EC_THROTTLER) += cros_ec_throttler.o
> > diff --git a/drivers/misc/throttler/cros_ec_throttler.c b/drivers/misc/throttler/cros_ec_throttler.c
> > new file mode 100644
> > index 000000000000..ea6bc002d49c
> > --- /dev/null
> > +++ b/drivers/misc/throttler/cros_ec_throttler.c
> > @@ -0,0 +1,122 @@
> > +/*
> > + * Driver for throttling triggered by EC events.
> > + *
> > + * Copyright (C) 2018 Google, Inc.
> > + *
> > + * This software is licensed under the terms of the GNU General Public
> > + * License version 2, as published by the Free Software Foundation, and
> > + * may be copied, distributed, and modified under those terms.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
>
> Replace this for the SPDX header format
>
> // SPDX-License-Identifier: GPL-2.0+
> // Driver for throttling triggered by EC events.
> //
> // Copyright (C) 2018 Google, Inc.
> // Author: Matthias Kaehlcke <mka@chromium.org>
>
> > +#include <linux/kernel.h>
> > +#include <linux/mfd/cros_ec.h>
> > +#include <linux/module.h>
> > +#include <linux/notifier.h>
> > +#include <linux/of.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/throttler.h>
> > +
> > +struct cros_ec_throttler {
> > + struct cros_ec_device *ec;
> > + struct throttler *throttler;
> > + struct notifier_block nb;
> > +};
> > +
> > +static int cros_ec_throttler_event(struct notifier_block *nb,
> > + unsigned long queued_during_suspend, void *_notify)
> > +{
> > + struct cros_ec_throttler *cte =
> > + container_of(nb, struct cros_ec_throttler, nb);
>
> nit: Better add a define here instead of split the line like this ?
>
> > + u32 host_event;
> > +
> > + host_event = cros_ec_get_host_event(cte->ec);
> > + if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_THROTTLE_START)) {
> > + throttler_set_level(cte->throttler, 1);
> > +
> > + return NOTIFY_OK;
> > + } else if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_THROTTLE_STOP)) {
> > + throttler_set_level(cte->throttler, 0);
> > +
> > + return NOTIFY_OK;
> > + }
> > +
> > + return NOTIFY_DONE;
> > +}
> > +
> > +static int cros_ec_throttler_probe(struct platform_device *pdev)
> > +{
> > + struct cros_ec_throttler *cte;
> > + struct device *dev = &pdev->dev;
> > + struct device_node *np = pdev->dev.of_node;
> > + int ret;
> > +
> > + if (!np) {
> > + /* should never happen */
> > + return -EINVAL;
> > + }
> > +
> > + cte = devm_kzalloc(dev, sizeof(*cte), GFP_KERNEL);
> > + if (!cte)
> > + return -ENOMEM;
> > +
> > + cte->ec = dev_get_drvdata(pdev->dev.parent);
> > +
> > + cte->throttler = throttler_setup(dev);
> > + if (IS_ERR(cte->throttler))
> > + return PTR_ERR(cte->throttler);
> > +
> > + dev_set_drvdata(dev, cte);
> > +
> > + cte->nb.notifier_call = cros_ec_throttler_event;
> > + ret = blocking_notifier_chain_register(&cte->ec->event_notifier,
> > + &cte->nb);
> > + if (ret < 0) {
> > + dev_err(dev, "failed to register notifier\n");
> > + throttler_teardown(cte->throttler);
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int cros_ec_throttler_remove(struct platform_device *pdev)
> > +{
> > + struct cros_ec_throttler *cte = platform_get_drvdata(pdev);
> > +
> > + blocking_notifier_chain_unregister(&cte->ec->event_notifier,
> > + &cte->nb);
> > +
> > + throttler_teardown(cte->throttler);
> > +
> > + return 0;
> > +}
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id cros_ec_throttler_of_match[] = {
> > + { .compatible = "google,cros-ec-throttler" },
> > + { /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, cros_ec_throttler_of_match);
> > +#endif /* CONFIG_OF */
> > +
> > +static struct platform_driver cros_ec_throttler_driver = {
> > + .driver = {
> > + .name = "cros-ec-throttler",
> > + .of_match_table = of_match_ptr(cros_ec_throttler_of_match),
> > + },
> > + .probe = cros_ec_throttler_probe,
> > + .remove = cros_ec_throttler_remove,
> > +};
> > +
> > +module_platform_driver(cros_ec_throttler_driver);
> > +
> > +MODULE_LICENSE("GPL");
> > +MODULE_AUTHOR("Matthias Kaehlcke <mka@chromium.org>");
> > +MODULE_DESCRIPTION("Chrome OS EC Throttler");
>
> s/Chrome OS/ChromeOS/
>
> >
>
> Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
>
> Thanks,
> Enric

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