Hi Kumar,
On 23-09-2014 11:18 PM, Kumar Gala wrote:
>
> On Sep 23, 2014, at 1:28 AM, Pramod Gurav <pramod.gu...@smartplayin.com>
> wrote:
>
>> +linux-arm-msm
>> On Tuesday 23 September 2014 11:38 AM, Pramod Gurav wrote:
>>> This change replaces use of arm_pm_restart with recently introduced
>>> reset mechanism in Linux kernel called restart_notifier.
>
> Can you update the commit message to include details about the priority level
> we are setting it to.
>
> Probably something like Josh had:
>
> Choose priority 128, as according to documentation, this mechanism "is
> sufficient to restart the entire system”.
Will update the commit message.
>
> Hmm, what happens if we have ps_hold restart and msm-poweroff enabled. Which
> one should have priority?
In case of A-family/apq8064, the ps_hold register region is owned by
pinctrl hence the reset is implemented in pinctrl driver as the region
is already mapped there.
I have had a discussion with Stephen Boyd and was informed that ps_hold
register region in apq8074/B-family are moved to its own region and we
need to reset it through pinctrl.
So, for b family there is no need for ps_hold to be configured/muxed in
pinctrl and Josh's changes wont execute. Hence msm-poweroff wil be the
default reset as 128 in the default priority.
Hope I was able to put it well to answer your comment.
>
>>>
>>> Reviewed-by: Guenter Roeck <li...@roeck-us.net>
>>> Cc: Guenter Roeck <li...@roeck-us.net>
>>> Cc: Josh Cartwright <jo...@codeaurora.org>
>>> Cc: Sebastian Reichel <s...@kernel.org>
>>> Cc: Dmitry Eremin-Solenikov <dbarysh...@gmail.com>
>>> Cc: David Woodhouse <dw...@infradead.org>
>>> Cc: Stephen Boyd <sb...@codeaurora.org>
>>> Cc: linux...@vger.kernel.org
>>>
>>> Signed-off-by: Pramod Gurav <pramod.gu...@smartplayin.com>
>>> ---
>>> Tested on Dragonboard APQ8074
>>>
>>> Changes since v2:
>>> - Removed unwanted header file and added linux/pm.h
>>>
>>> Changes since v1:
>>> - Initialized restart_nb with its declaration
>>> - Removed return check for register_restart_handler as it always
>>> returns 0 as per Guenter's suggestion to Josh's similar patch.
>>> This takes care of Guenter's comments on error logs and NULL
>>> initialization of restart_nb.notifier_call.
>>> ---
>>> drivers/power/reset/msm-poweroff.c | 20 ++++++++++++++------
>>> 1 file changed, 14 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/power/reset/msm-poweroff.c
>>> b/drivers/power/reset/msm-poweroff.c
>>> index 774f9a3..4702efd 100644
>>> --- a/drivers/power/reset/msm-poweroff.c
>>> +++ b/drivers/power/reset/msm-poweroff.c
>>> @@ -20,21 +20,27 @@
>>> #include <linux/platform_device.h>
>>> #include <linux/module.h>
>>> #include <linux/reboot.h>
>>> -
>>> -#include <asm/system_misc.h>
>>> +#include <linux/pm.h>
>>>
>>> static void __iomem *msm_ps_hold;
>>> -
>>> -static void do_msm_restart(enum reboot_mode reboot_mode, const char *cmd)
>>> +static int do_msm_restart(struct notifier_block *nb, unsigned long action,
>>> + void *data)
>>> {
>>> writel(0, msm_ps_hold);
>>> mdelay(10000);
>>> +
>>> + return NOTIFY_DONE;
>>> }
>>>
>>> +static struct notifier_block restart_nb = {
>>> + .notifier_call = do_msm_restart,
>>> + .priority = 128,
>>> +};
>>> +
>>> static void do_msm_poweroff(void)
>>> {
>>> /* TODO: Add poweroff capability */
>>> - do_msm_restart(REBOOT_HARD, NULL);
>>> + do_msm_restart(&restart_nb, 0, NULL);
>>> }
>>>
>>> static int msm_restart_probe(struct platform_device *pdev)
>>> @@ -47,8 +53,10 @@ static int msm_restart_probe(struct platform_device
>>> *pdev)
>>> if (IS_ERR(msm_ps_hold))
>>> return PTR_ERR(msm_ps_hold);
>>>
>>> + register_restart_handler(&restart_nb);
>>> +
>>> pm_power_off = do_msm_poweroff;
>>> - arm_pm_restart = do_msm_restart;
>>> +
>>> return 0;
>>> }
>>>
>>>
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