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gpio: gpio-omap: Revert deferred wakeup quirk handling for regressions 

Commit ec0daae685 ("gpio: omap: Add level wakeup handling for omap4
based SoCs") attempted to fix omap4 GPIO wakeup handling as it was
blocking deeper SoC idle states. However this caused a regression for
GPIOs during runtime having over second long latencies for Ethernet
GPIO interrupt as reportedy by Russell King <rmk+kernel@armlinux.org.uk>.

Let's fix this issue by doing a partial revert of the breaking commit.
We still want to keep the quirk handling around as it is also used for
OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER.

The real fix for omap4 GPIO wakeup handling involves fixes for
omap_set_gpio_trigger() and omap_gpio_unmask_irq() and will be posted
separately. And we must keep the wakeup bit enabled during runtime
because of module doing clock autogating with autoidle configured.

Reported-by: Russell King <rmk+kernel@armlinux.org.uk>
Fixes: ec0daae685 ("gpio: omap: Add level wakeup handling for omap4
based SoCs")
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
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>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Tony Lindgren 2018-12-07 11:08:29 -08:00 committed by Linus Walleij
parent e59f5e08ec
commit 00ded24c33
1 changed files with 5 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
drivers/gpio/gpio-omap.c
View File

@ -32,7 +32,6 @@
#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
#define OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER BIT(2)
#define OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN BIT(1)
struct gpio_regs {
u32 irqenable1;
@ -379,18 +378,9 @@ static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
readl_relaxed(bank->base + bank->regs->fallingdetect);
if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
/* Defer wkup_en register update until we idle? */
if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) {
if (trigger)
bank->context.wake_en |= gpio_bit;
else
bank->context.wake_en &= ~gpio_bit;
} else {
omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit,
trigger != 0);
bank->context.wake_en =
readl_relaxed(bank->base + bank->regs->wkup_en);
}
omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
bank->context.wake_en =
readl_relaxed(bank->base + bank->regs->wkup_en);
}
/* This part needs to be executed always for OMAP{34xx, 44xx} */
@ -942,44 +932,6 @@ omap2_gpio_disable_level_quirk(struct gpio_bank *bank)
bank->base + bank->regs->risingdetect);
}
/*
* On omap4 and later SoC variants a level interrupt with wkup_en
* enabled blocks the GPIO functional clock from idling until the GPIO
* instance has been reset. To avoid that, we must set wkup_en only for
* idle for level interrupts, and clear level registers for the duration
* of idle. The level interrupts will be still there on wakeup by their
* nature.
*/
static void __maybe_unused
omap4_gpio_enable_level_quirk(struct gpio_bank *bank)
{
/* Update wake register for idle, edge bits might be already set */
writel_relaxed(bank->context.wake_en,
bank->base + bank->regs->wkup_en);
/* Clear level registers for idle */
writel_relaxed(0, bank->base + bank->regs->leveldetect0);
writel_relaxed(0, bank->base + bank->regs->leveldetect1);
}
static void __maybe_unused
omap4_gpio_disable_level_quirk(struct gpio_bank *bank)
{
/* Restore level registers after idle */
writel_relaxed(bank->context.leveldetect0,
bank->base + bank->regs->leveldetect0);
writel_relaxed(bank->context.leveldetect1,
bank->base + bank->regs->leveldetect1);
/* Clear saved wkup_en for level, it will be set for next idle again */
bank->context.wake_en &= ~(bank->context.leveldetect0 |
bank->context.leveldetect1);
/* Update wake with only edge configuration */
writel_relaxed(bank->context.wake_en,
bank->base + bank->regs->wkup_en);
}
/*---------------------------------------------------------------------*/
static int omap_mpuio_suspend_noirq(struct device *dev)
@ -1412,12 +1364,7 @@ static int omap_gpio_probe(struct platform_device *pdev)
omap_set_gpio_dataout_mask_multiple;
}
if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) {
bank->funcs.idle_enable_level_quirk =
omap4_gpio_enable_level_quirk;
bank->funcs.idle_disable_level_quirk =
omap4_gpio_disable_level_quirk;
} else if (bank->quirks & OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER) {
if (bank->quirks & OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER) {
bank->funcs.idle_enable_level_quirk =
omap2_gpio_enable_level_quirk;
bank->funcs.idle_disable_level_quirk =
@ -1806,8 +1753,7 @@ static const struct omap_gpio_platform_data omap4_pdata = {
.regs = &omap4_gpio_regs,
.bank_width = 32,
.dbck_flag = true,
.quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER |
OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN,
.quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER,
};
static const struct of_device_id omap_gpio_match[] = {