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gpio: gpio-omap: limit errata 1.101 handling to wkup domain gpios only

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We need to only apply errata 1.101 handling to clear non-wakeup edge gpios
for idle to the gpio bank(s) in the wkup domain to prevent spurious wake-up
events.

And we must restore what we did after idle manually as the gpio bank in
wkup domain is not restored otherwise.

Let's keep bank->saved_datain register reading separate, that's not related
to the 1.101 errata and is used separately on restore.

Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Tero Kristo <t-kristo@ti.com>
Reported-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Tony Lindgren 2019-03-25 15:43:16 -07:00 • committed by Bartosz Golaszewski
parent c78c42d771
commit 21e2118f47
1 changed files with 16 additions and 12 deletions
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28
drivers/gpio/gpio-omap.c
View file

@ -1444,7 +1444,10 @@ static void omap_gpio_restore_context(struct gpio_bank *bank);
static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
{
struct device *dev = bank->chip.parent;
u32 l1 = 0, l2 = 0;
void __iomem *base = bank->base;
u32 nowake;
bank->saved_datain = readl_relaxed(base + bank->regs->datain);
if (bank->funcs.idle_enable_level_quirk)
bank->funcs.idle_enable_level_quirk(bank);
@ -1456,20 +1459,15 @@ static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
goto update_gpio_context_count;
/*
* If going to OFF, remove triggering for all
* If going to OFF, remove triggering for all wkup domain
* non-wakeup GPIOs. Otherwise spurious IRQs will be
* generated. See OMAP2420 Errata item 1.101.
*/
bank->saved_datain = readl_relaxed(bank->base +
bank->regs->datain);
l1 = bank->context.fallingdetect;
l2 = bank->context.risingdetect;
l1 &= ~bank->enabled_non_wakeup_gpios;
l2 &= ~bank->enabled_non_wakeup_gpios;
writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
writel_relaxed(l2, bank->base + bank->regs->risingdetect);
if (!bank->loses_context && bank->enabled_non_wakeup_gpios) {
nowake = bank->enabled_non_wakeup_gpios;
omap_gpio_rmw(base, bank->regs->fallingdetect, nowake, ~nowake);
omap_gpio_rmw(base, bank->regs->risingdetect, nowake, ~nowake);
}
bank->workaround_enabled = true;
@ -1518,6 +1516,12 @@ static void omap_gpio_unidle(struct gpio_bank *bank)
return;
}
}
} else {
/* Restore changes done for OMAP2420 errata 1.101 */
writel_relaxed(bank->context.fallingdetect,
bank->base + bank->regs->fallingdetect);
writel_relaxed(bank->context.risingdetect,
bank->base + bank->regs->risingdetect);
}
if (!bank->workaround_enabled)