Message-ID: <54D9E42C.7010105@gmail.com>
Date:	Tue, 10 Feb 2015 10:57:48 +0000
From:	Jon Hunter <jgchunter@...il.com>
To:	Jon Hunter <jonathanh@...dia.com>, Paul Walmsley <paul@...an.com>,
	linux-omap@...r.kernel.org
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org,
	"aaro.koskinen@....fi >> Aaro Koskinen" <aaro.koskinen@....fi>,
	tuukka.tikkanen@...aro.org,
	"khilman@...prootsystems.com >> Kevin Hilman" 
	<khilman@...prootsystems.com>,
	"tony@...mide.com >> Tony Lindgren" <tony@...mide.com>,
	"linux@....linux.org.uk >> Russell King" <linux@....linux.org.uk>
Subject: Re: [PATCH] ARM: OMAP1: PM: fix some build warnings on 1510-only
 Kconfigs

Hi Paul,

On 07/02/2015 00:23, Paul Walmsley wrote:
> 
> Building an OMAP1510-only Kconfig generates the following warnings:
> 
> arch/arm/mach-omap1/pm.c: In function ‘omap1_pm_idle’:
> arch/arm/mach-omap1/pm.c:123:2: warning: #warning Enable 32kHz OS timer
> in order to allow sleep states in idle [-Wcpp]
>  #warning Enable 32kHz OS timer in order to allow sleep states in idle
>   ^
> arch/arm/mach-omap1/pm.c: At top level:
> arch/arm/mach-omap1/pm.c:76:23: warning: ‘enable_dyn_sleep’ defined but
> not used [-Wunused-variable]
>  static unsigned short enable_dyn_sleep = 0;
>                        ^
> 
> These are not so easy to fix in an obviously correct fashion, since I
> don't have these devices up and running in my testbed.  So, use
> arch/arm/plat-omap/Kconfig and the existing pm.c source as a guide,
> and posit that deep power saving states are only supported on OMAP16xx
> chips with kernels built with both CONFIG_OMAP_DM_TIMER=y and
> CONFIG_OMAP_32K_TIMER=y.
> 
> While here, clean up a few printk()s and unnecessary #ifdefs.
> 
> Signed-off-by: Paul Walmsley <paul@...an.com>
> Cc: Jon Hunter <jonathanh@...dia.com>
> Cc: Aaro Koskinen <aaro.koskinen@....fi>
> Cc: Tuukka Tikkanen <tuukka.tikkanen@...aro.org>
> Cc: Kevin Hilman <khilman@...prootsystems.com>
> Cc: Tony Lindgren <tony@...mide.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: linux-omap@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
> 
> Hi folks, if anyone out there is still experimenting with OMAP1 PM, or has
> a copy of the OMAP1510 TRMs, could you please check this patch?  I'm
> unable to test it since I don't have any OMAP1 devices currently active
> in the testbed.  It at least compiles and deals with the build warnings:

You can find the omap5910 documents here [1]. The omap5910 is equivalent
to the omap1510. Unfortunately, there is not a single TRM for the
omap5910 but individual documents for each chapter in the original TRM.
Check out the "OMAP5910 Dual-Core Processor Timer Reference Guide" and
possibly the "OMAP5910 Dual-Core Processor
Clock Generation and System Reset Management Reference Guide"

The omap15xx/5910 did have a 32k timer but as you can see it appears it
was never supported by the kernel for this device (not sure why). I do
recall that there is some errata regarding the 32k timer, if you look at
the omap5910 errata document and search for 32k you should find it.

I no longer have access to omap15xx h/w to test. However, I do have
omap5912 if you want me to test.

> http://www.pwsan.com/omap/testlogs/fix-omap-warnings-v3.21/20150206154619/
> 
> Non-critical; targeted for v3.20-rc1 or v3.21-rc1.
> 
> 
>  arch/arm/mach-omap1/pm.c | 42 +++++++++++++++++++++---------------------
>  1 file changed, 21 insertions(+), 21 deletions(-)
> 
> diff --git a/arch/arm/mach-omap1/pm.c b/arch/arm/mach-omap1/pm.c
> index 34b4c0044961..d46d8a222fbb 100644
> --- a/arch/arm/mach-omap1/pm.c
> +++ b/arch/arm/mach-omap1/pm.c
> @@ -71,13 +71,7 @@ static unsigned int
> mpui7xx_sleep_save[MPUI7XX_SLEEP_SAVE_SIZE];
>  static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
>  static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
> 
> -#ifndef CONFIG_OMAP_32K_TIMER
> -
> -static unsigned short enable_dyn_sleep = 0;
> -
> -#else
> -
> -static unsigned short enable_dyn_sleep = 1;
> +static unsigned short enable_dyn_sleep;
> 
>  static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
>  			 char *buf)
> @@ -90,8 +84,9 @@ static ssize_t idle_store(struct kobject *kobj, struct
> kobj_attribute *attr,
>  {
>  	unsigned short value;
>  	if (sscanf(buf, "%hu", &value) != 1 ||
> -	    (value != 0 && value != 1)) {
> -		printk(KERN_ERR "idle_sleep_store: Invalid value\n");
> +	    (value != 0 && value != 1) ||
> +	    (value != 0 && !IS_ENABLED(CONFIG_OMAP_32K_TIMER))) {
> +		pr_err("idle_sleep_store: Invalid value\n");
>  		return -EINVAL;
>  	}
>  	enable_dyn_sleep = value;
> @@ -101,7 +96,6 @@ static ssize_t idle_store(struct kobject *kobj,
> struct kobj_attribute *attr,
>  static struct kobj_attribute sleep_while_idle_attr =
>  	__ATTR(sleep_while_idle, 0644, idle_show, idle_store);
> 
> -#endif
> 
>  static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) =
> NULL;
> 
> @@ -120,12 +114,11 @@ void omap1_pm_idle(void)
>  	local_fiq_disable();
> 
>  #if defined(CONFIG_OMAP_MPU_TIMER) && !defined(CONFIG_OMAP_DM_TIMER)
> -#warning Enable 32kHz OS timer in order to allow sleep states in idle
>  	use_idlect1 = use_idlect1 & ~(1 << 9);
> -#else
> +#endif
> +
>  	if (enable_dyn_sleep)
>  		do_sleep = 1;

Do we still need this do_sleep variable now? Looking at the code, I
think we could use enable_dyn_sleep directly.

> -#endif
> 
>  #ifdef CONFIG_OMAP_DM_TIMER
>  	use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
> @@ -635,15 +628,24 @@ static const struct platform_suspend_ops
> omap_pm_ops = {
> 
>  static int __init omap_pm_init(void)
>  {
> -
> -#ifdef CONFIG_OMAP_32K_TIMER
> -	int error;
> -#endif
> +	int error = 0;
> 
>  	if (!cpu_class_is_omap1())
>  		return -ENODEV;
> 
> -	printk("Power Management for TI OMAP.\n");
> +	pr_info("Power Management for TI OMAP.\n");
> +
> +	if (!IS_ENABLED(CONFIG_OMAP_32K_TIMER))
> +		pr_info("OMAP1 PM: sleep states in idle disabled due to no 32KiHz
> timer\n");
> +
> +	if (!IS_ENABLED(CONFIG_OMAP_DM_TIMER))
> +		pr_info("OMAP1 PM: sleep states in idle disabled due to no DMTIMER
> support\n");
> +
> +	if (IS_ENABLED(CONFIG_OMAP_32K_TIMER) &&
> +	    IS_ENABLED(CONFIG_OMAP_DM_TIMER) && cpu_is_omap16xx()) {

Do you need cpu_is_omap16xx() here? I believe DM_TIMER is only available
on omap16xx onwards.

> +		pr_info("OMAP1 PM: sleep states in idle enabled\n");
> +		enable_dyn_sleep = 1;
> +	}
> 
>  	/*
>  	 * We copy the assembler sleep/wakeup routines to SRAM.
> @@ -693,17 +695,15 @@ static int __init omap_pm_init(void)
>  	omap_pm_init_debugfs();
>  #endif
> 
> -#ifdef CONFIG_OMAP_32K_TIMER
>  	error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr);
>  	if (error)
>  		printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
> -#endif
> 
>  	if (cpu_is_omap16xx()) {
>  		/* configure LOW_PWR pin */
>  		omap_cfg_reg(T20_1610_LOW_PWR);
>  	}
> 
> -	return 0;
> +	return error;
>  }
>  __initcall(omap_pm_init);
> 

Otherwise ...

Acked-by: Jon Hunter <jgchunter@...il.com>

Cheers Jon

[1] http://www.ti.com/product/OMAP5910/technicaldocuments
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