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gpio: omap: Block idle on pending gpio interrupts

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With the SoC cpuidle handling fixed for cpu_pm, we can now start to
return NOTIFY_BAD if there there are pending gpio interrupts.

This way the deeper SoC idle states can get blocked, and gpio latency
is improved in some cases. Note that this will not help with the
latency if the SoC has already entered a deeper idle state.

Note that this patch depends on cpu_pm properly handling the errors
returned by notifiers. For omap variants, this is fixed with patch
"ARM: OMAP2+: Handle errors for cpu_pm".

Cc: Dave Gerlach <d-gerlach@ti.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Ladislav Michl <ladis@linux-mips.org>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20200304225433.37336-3-tony@atomide.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Tony Lindgren 2020-03-04 14:54:31 -08:00 committed by Linus Walleij
parent 55be2f5033
commit 43582265be
1 changed files with 13 additions and 4 deletions
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17
drivers/gpio/gpio-omap.c
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@ -1237,26 +1237,35 @@ static int gpio_omap_cpu_notifier(struct notifier_block *nb,
{
struct gpio_bank *bank;
unsigned long flags;
int ret = NOTIFY_OK;
u32 isr, mask;
bank = container_of(nb, struct gpio_bank, nb);
raw_spin_lock_irqsave(&bank->lock, flags);
if (bank->is_suspended)
goto out_unlock;
switch (cmd) {
case CPU_CLUSTER_PM_ENTER:
if (bank->is_suspended)
mask = omap_get_gpio_irqbank_mask(bank);
isr = readl_relaxed(bank->base + bank->regs->irqstatus) & mask;
if (isr) {
ret = NOTIFY_BAD;
break;
}
omap_gpio_idle(bank, true);
break;
case CPU_CLUSTER_PM_ENTER_FAILED:
case CPU_CLUSTER_PM_EXIT:
if (bank->is_suspended)
break;
omap_gpio_unidle(bank);
break;
}
out_unlock:
raw_spin_unlock_irqrestore(&bank->lock, flags);
return NOTIFY_OK;
return ret;
}
static const struct omap_gpio_reg_offs omap2_gpio_regs = {