Re: [PATCH v4 07/11] thermal: Use mode helpers in drivers

From: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
To: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Cc: linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org,
	netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
	platform-driver-x86@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-renesas-soc@vger.kernel.org,
	linux-rockchip@lists.infradead.org,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	"Len Brown" <lenb@kernel.org>,
	"Vishal Kulkarni" <vishal@chelsio.com>,
	"David S . Miller" <davem@davemloft.net>,
	"Jiri Pirko" <jiri@mellanox.com>,
	"Ido Schimmel" <idosch@mellanox.com>,
	"Johannes Berg" <johannes.berg@intel.com>,
	"Emmanuel Grumbach" <emmanuel.grumbach@intel.com>,
	"Luca Coelho" <luciano.coelho@intel.com>,
	"Intel Linux Wireless" <linuxwifi@intel.com>,
	"Kalle Valo" <kvalo@codeaurora.org>,
	"Peter Kaestle" <peter@piie.net>,
	"Darren Hart" <dvhart@infradead.org>,
	"Andy Shevchenko" <andy@infradead.org>,
	"Sebastian Reichel" <sre@kernel.org>,
	"Miquel Raynal" <miquel.raynal@bootlin.com>,
	"Daniel Lezcano" <daniel.lezcano@linaro.org>,
	"Amit Kucheria" <amit.kucheria@verdurent.com>,
	"Support Opensource" <support.opensource@diasemi.com>,
	"Shawn Guo" <shawnguo@kernel.org>,
	"Sascha Hauer" <s.hauer@pengutronix.de>,
	"Pengutronix Kernel Team" <kernel@pengutronix.de>,
	"Fabio Estevam" <festevam@gmail.com>,
	"NXP Linux Team" <linux-imx@nxp.com>,
	"Niklas Söderlund" <niklas.soderlund@ragnatech.se>,
	"Heiko Stuebner" <heiko@sntech.de>,
	"Orson Zhai" <orsonzhai@gmail.com>,
	"Baolin Wang" <baolin.wang7@gmail.com>,
	"Chunyan Zhang" <zhang.lyra@gmail.com>,
	"Zhang Rui" <rui.zhang@intel.com>,
	"Allison Randal" <allison@lohutok.net>,
	"Enrico Weigelt" <info@metux.net>,
	"Gayatri Kammela" <gayatri.kammela@intel.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	kernel@collabora.com
Subject: Re: [PATCH v4 07/11] thermal: Use mode helpers in drivers
Date: Wed, 24 Jun 2020 11:51:40 +0200	[thread overview]
Message-ID: <313ca24a-0cc4-a976-19bb-0f30aa845226@samsung.com> (raw)
In-Reply-To: <20200528192051.28034-8-andrzej.p@collabora.com>

On 5/28/20 9:20 PM, Andrzej Pietrasiewicz wrote:
> Use thermal_zone_device_{en|dis}able() and thermal_zone_device_is_enabled().
> 
> Consequently, all set_mode() implementations in drivers:
> 
> - can stop modifying tzd's "mode" member,
> - shall stop taking tzd's lock, as it is taken in the helpers
> - shall stop calling thermal_zone_device_update() as it is called in the
> helpers
> - can assume they are called when the mode truly changes, so checks to
> verify that can be dropped
> 
> Not providing set_mode() by a driver no longer prevents the core from
> being able to set tzd's mode, so the relevant check in mode_store() is
> removed.
> 
> Other comments:
> 
> - acpi/thermal.c: tz->thermal_zone->mode will be updated only after we
> return from set_mode(), so use function parameter in thermal_set_mode()
> instead, no need to call acpi_thermal_check() in set_mode()
> - thermal/imx_thermal.c: regmap writes and mode assignment are done in
> thermal_zone_device_{en|dis}able() and set_mode() callback
> - thermal/intel/intel_quark_dts_thermal.c: soc_dts_{en|dis}able() are a
> part of set_mode() callback, so they don't need to modify tzd->mode, and
> don't need to fall back to the opposite mode if unsuccessful, as the return
> value will be propagated to thermal_zone_device_{en|dis}able() and
> ultimately tzd's member will not be changed in thermal_zone_device_set_mode().
> - thermal/of-thermal.c: no need to set zone->mode to DISABLED in
> of_parse_thermal_zones() as a tzd is kzalloc'ed so mode is DISABLED anyway
> 
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> ---
>  drivers/acpi/thermal.c                        | 21 ++++++-----
>  .../ethernet/mellanox/mlxsw/core_thermal.c    | 37 +++++++++----------
>  drivers/platform/x86/acerhdf.c                | 17 +++++----
>  drivers/thermal/da9062-thermal.c              |  6 ++-
>  drivers/thermal/hisi_thermal.c                |  6 ++-
>  drivers/thermal/imx_thermal.c                 | 33 +++++++----------
>  .../intel/int340x_thermal/int3400_thermal.c   |  5 +--
>  .../thermal/intel/intel_quark_dts_thermal.c   | 18 ++-------
>  drivers/thermal/rockchip_thermal.c            |  6 ++-
>  drivers/thermal/sprd_thermal.c                |  6 ++-
>  drivers/thermal/thermal_core.c                |  2 +-
>  drivers/thermal/thermal_of.c                  | 10 +----
>  drivers/thermal/thermal_sysfs.c               | 11 ++----
>  13 files changed, 80 insertions(+), 98 deletions(-)

[...]

> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 32c5fe16b7f7..3efe749dc5a0 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -397,19 +397,16 @@ static inline void acerhdf_revert_to_bios_mode(void)
>  {
>  	acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
>  	kernelmode = 0;
> -	if (thz_dev) {
> -		thz_dev->mode = THERMAL_DEVICE_DISABLED;
> +	if (thz_dev)
>  		thz_dev->polling_delay = 0;
> -	}
> +
>  	pr_notice("kernel mode fan control OFF\n");
>  }
>  static inline void acerhdf_enable_kernelmode(void)
>  {
>  	kernelmode = 1;
> -	thz_dev->mode = THERMAL_DEVICE_ENABLED;
>  
>  	thz_dev->polling_delay = interval*1000;
> -	thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
>  	pr_notice("kernel mode fan control ON\n");
>  }
>  
> @@ -723,6 +720,8 @@ static void acerhdf_unregister_platform(void)
>  
>  static int __init acerhdf_register_thermal(void)
>  {
> +	int ret;
> +
>  	cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
>  						 &acerhdf_cooling_ops);
>  
> @@ -736,8 +735,12 @@ static int __init acerhdf_register_thermal(void)
>  	if (IS_ERR(thz_dev))
>  		return -EINVAL;
>  
> -	thz_dev->mode = kernelmode ?
> -		THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED;
> +	if (kernelmode)
> +		ret = thermal_zone_device_enable(thz_dev);
> +	else
> +		ret = thermal_zone_device_disable(thz_dev);
> +	if (ret)

Cleanup on error seems to be missing here.

> +		return ret;
>  
>  	if (strcmp(thz_dev->governor->name,
>  				acerhdf_zone_params.governor_name)) {

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics