[PATCH 3/3] ARM: at91: pm: fallback to slowclock when backup mode fails
Yang, Wenyou
Wenyou.Yang at Microchip.com
Thu Apr 27 21:34:12 EDT 2017
On 2017/4/27 0:04, Alexandre Belloni wrote:
> If the backup sram allocation fails, ensure we can suspend by falling back
> to the usual slow clock mode.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni at free-electrons.com>
Acked-by: Wenyou Yang <wenyou.yang at atmel.com>
> ---
> arch/arm/mach-at91/pm.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index d08f032f9d94..02823d8f3ada 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -519,24 +519,30 @@ static void __init at91_pm_bu_sram_init(void)
>
> if (!pdev) {
> pr_warn("%s: failed to find securam device!\n", __func__);
> - return;
> + goto fallback;
> }
>
> sram_pool = gen_pool_get(&pdev->dev, NULL);
> if (!sram_pool) {
> pr_warn("%s: securam pool unavailable!\n", __func__);
> - return;
> + goto fallback;
> }
>
> pm_bu = (void *)gen_pool_alloc(sram_pool, sizeof(struct at91_pm_bu));
> if (!pm_bu) {
> pr_warn("%s: unable to alloc securam!\n", __func__);
> - return;
> + goto fallback;
> }
>
> pm_bu->suspended = 0;
> pm_bu->canary = virt_to_phys(&canary);
> pm_bu->resume = virt_to_phys(cpu_resume);
> +
> +fallback:
> + if (pm_data.standby_mode == AT91_PM_BACKUP)
> + pm_data.standby_mode = AT91_PM_SLOW_CLOCK;
> + if (pm_data.suspend_mode != AT91_PM_BACKUP)
> + pm_data.suspend_mode = AT91_PM_SLOW_CLOCK;
> }
>
> struct pmc_info {
Best Regards,
Wenyou Yang
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