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SubjectRe: [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@pwsan.com>
> Cc: Jon Hunter <jonathanh@nvidia.com>
> Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
> Cc: Tuukka Tikkanen <tuukka.tikkanen@linaro.org>
> Cc: Kevin Hilman <khilman@deeprootsystems.com>
> Cc: Tony Lindgren <tony@atomide.com>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: linux-omap@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.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@gmail.com>

Cheers Jon

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


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