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authorTony Lindgren <tony@atomide.com>2019-03-25 15:43:16 -0700
committerBartosz Golaszewski <bgolaszewski@baylibre.com>2019-03-27 14:25:37 +0100
commit21e2118f470302f16bee7ebd1444505eadbc2c20 (patch)
tree18c8455fc27d89a44e0efbfe56ba4cd1d15f2c85 /drivers/gpio/gpio-omap.c
parentc78c42d77165791c8198d7a86d1989ba65cf73a8 (diff)
downloadlinux-21e2118f470302f16bee7ebd1444505eadbc2c20.tar.bz2
gpio: gpio-omap: limit errata 1.101 handling to wkup domain gpios only
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>
Diffstat (limited to 'drivers/gpio/gpio-omap.c')
-rw-r--r--drivers/gpio/gpio-omap.c28
1 files changed, 16 insertions, 12 deletions
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 7f33024b6d83..6375364f6623 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -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)