[PATCH 2/3] gpio: omap: Block idle on pending gpio interrupts
From: Tony Lindgren <tony@atomide.com>
Date: 2020-03-04 22:54:45
Also in:
linux-gpio, linux-omap
Subsystem:
gpio subsystem, omap gpio driver, the rest · Maintainers:
Linus Walleij, Bartosz Golaszewski, Grygorii Strashko, Santosh Shilimkar, Kevin Hilman, Linus Torvalds
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 <redacted> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Keerthy <j-keerthy@ti.com> Cc: Ladislav Michl <redacted> Cc: Russell King <redacted> Cc: Tero Kristo <redacted> Signed-off-by: Tony Lindgren <tony@atomide.com> --- drivers/gpio/gpio-omap.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c@@ -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 = {
--
2.25.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel