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Message-ID: <alpine.LNX.2.00.1204170152380.23403@swampdragon.chaosbits.net>
Date: Tue, 17 Apr 2012 01:56:27 +0200 (CEST)
From: Jesper Juhl <jj@...osbits.net>
To: Robert Lee <rob.lee@...aro.org>
cc: kernel@...gutronix.de, shawn.guo@...aro.org,
amit.kucheria@...aro.org, daniel.lezcano@...aro.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linaro-dev@...ts.linaro.org, patches@...aro.org
Subject: Re: [PATCH 1/3] ARM: imx: Add common imx cpuidle init
functionality.
On Mon, 16 Apr 2012, Robert Lee wrote:
> Add common cpuidle init functionality that can be used by various
> imx platforms.
>
> Signed-off-by: Robert Lee <rob.lee@...aro.org>
> ---
> arch/arm/plat-mxc/Makefile | 2 +
> arch/arm/plat-mxc/cpuidle.c | 89 ++++++++++++++++++++++++++++++
> arch/arm/plat-mxc/include/mach/cpuidle.h | 26 +++++++++
> 3 files changed, 117 insertions(+)
> create mode 100644 arch/arm/plat-mxc/cpuidle.c
> create mode 100644 arch/arm/plat-mxc/include/mach/cpuidle.h
>
A few pedantic/ignorable comments below.
> diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
> index e81290c..7c9e05f 100644
> --- a/arch/arm/plat-mxc/Makefile
> +++ b/arch/arm/plat-mxc/Makefile
> @@ -16,6 +16,8 @@ obj-$(CONFIG_MXC_ULPI) += ulpi.o
> obj-$(CONFIG_MXC_USE_EPIT) += epit.o
> obj-$(CONFIG_MXC_DEBUG_BOARD) += 3ds_debugboard.o
> obj-$(CONFIG_CPU_FREQ_IMX) += cpufreq.o
> +obj-$(CONFIG_CPU_IDLE) += cpuidle.o
> +
> ifdef CONFIG_SND_IMX_SOC
> obj-y += ssi-fiq.o
> obj-y += ssi-fiq-ksym.o
> diff --git a/arch/arm/plat-mxc/cpuidle.c b/arch/arm/plat-mxc/cpuidle.c
> new file mode 100644
> index 0000000..d1c9301
> --- /dev/null
> +++ b/arch/arm/plat-mxc/cpuidle.c
> @@ -0,0 +1,89 @@
> +/*
> + * Copyright 2012 Freescale Semiconductor, Inc.
> + * Copyright 2012 Linaro Ltd.
> + *
> + * The code contained herein is licensed under the GNU General Public
> + * License. You may obtain a copy of the GNU General Public License
> + * Version 2 or later at the following locations:
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/io.h>
> +#include <linux/cpuidle.h>
> +#include <linux/hrtimer.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +
> +static struct cpuidle_device __percpu * imx_cpuidle_devices;
> +static struct cpuidle_driver *drv;
> +
> +void __init imx_cpuidle_set_driver(struct cpuidle_driver *p)
> +{
> + drv = p;
> +}
> +
> +void imx_cpuidle_devices_uninit(void)
> +{
> + int cpu_id;
> + struct cpuidle_device *dev;
> +
> + for_each_possible_cpu(cpu_id) {
> + dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id);
> + cpuidle_unregister_device(dev);
> + }
> +
> + free_percpu(imx_cpuidle_devices);
> +}
> +
> +static int __init imx_cpuidle_init(void)
> +{
> + struct cpuidle_device *dev;
> + int cpu_id, ret;
> +
> + if (!drv || drv->state_count > CPUIDLE_STATE_MAX) {
> + pr_err("%s: Invalid Input\n", __func__);
> + return -EINVAL;
> + }
> +
> + ret = cpuidle_register_driver(drv);
> +
Pointless blank line. I'd suggest removing it.
> + if (ret) {
> + pr_err("%s: Failed to register cpuidle driver\n", __func__);
> + return ret;
> + }
> +
> + imx_cpuidle_devices = alloc_percpu(struct cpuidle_device);
> +
Same here. Pointless blank line.
> + if (imx_cpuidle_devices == NULL) {
> + ret = -ENOMEM;
> + goto unregister_drv;
> + }
> +
> + /* initialize state data for each cpuidle_device */
> + for_each_possible_cpu(cpu_id) {
> + dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id);
> + dev->cpu = cpu_id;
> + dev->state_count = drv->state_count;
> +
> + ret = cpuidle_register_device(dev);
> + if (ret) {
> + pr_err("%s: Failed to register cpu %u\n",
> + __func__, cpu_id);
> + goto uninit;
> + }
> + }
> +
> + return 0;
> +
> +uninit:
> + imx_cpuidle_devices_uninit();
> +
> +unregister_drv:
> + cpuidle_unregister_driver(drv);
> +
Blank line here seems pointless.
> + return ret;
> +}
> +late_initcall(imx_cpuidle_init);
> diff --git a/arch/arm/plat-mxc/include/mach/cpuidle.h b/arch/arm/plat-mxc/include/mach/cpuidle.h
> new file mode 100644
> index 0000000..6509f19
> --- /dev/null
> +++ b/arch/arm/plat-mxc/include/mach/cpuidle.h
> @@ -0,0 +1,26 @@
> +/*
> + * Copyright 2012 Freescale Semiconductor, Inc.
> + * Copyright 2012 Linaro Ltd.
> + *
> + * The code contained herein is licensed under the GNU General Public
> + * License. You may obtain a copy of the GNU General Public License
> + * Version 2 or later at the following locations:
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
> +#include <linux/cpuidle.h>
> +
> +extern int imx5_cpuidle_init(void);
> +extern int imx6q_cpuidle_init(void);
> +
> +#ifdef CONFIG_CPU_IDLE
> +extern void imx_cpuidle_devices_uninit(void);
> +extern void imx_cpuidle_set_driver(struct cpuidle_driver *p);
> +extern int imx5_cpuidle_init(void);
> +extern int imx6q_cpuidle_init(void);
> +#else
> +static inline void imx_cpuidle_devices_uninit(void) {}
> +static inline void imx_cpuidle_set_driver(struct cpuidle_driver *p) {}
> +#endif
>
--
Jesper Juhl <jj@...osbits.net> http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
Plain text mails only, please.
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