linux-kernel - [PATCH V4 03/18] gpio: tegra: use resume

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Date:   Sun, 23 Jun 2019 20:02:44 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <tglx@...utronix.de>, <jason@...edaemon.net>,
        <marc.zyngier@....com>, <linus.walleij@...aro.org>,
        <stefan@...er.ch>, <mark.rutland@....com>
CC:     <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
        <sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, <jckuo@...dia.com>,
        <josephl@...dia.com>, <talho@...dia.com>, <skomatineni@...dia.com>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <mperttunen@...dia.com>, <spatra@...dia.com>, <robh+dt@...nel.org>,
        <digetx@...il.com>, <devicetree@...r.kernel.org>
Subject: [PATCH V4 03/18] gpio: tegra: use resume_noirq for tegra gpio resume

During SC7 resume, PARKED bit clear from the pinmux registers may
cause a glitch on the GPIO lines.

So, Tegra GPIOs restore should happen prior to restoring Tegra pinmux
to keep the GPIO lines in a known good state prior to clearing PARKED
bit.

This patch has fix for this by moving Tegra GPIOs restore to happen
very early than pinctrl resume.

Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
---
 drivers/gpio/gpio-tegra.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index f57bfc07ae22..f427540568f9 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -410,7 +410,7 @@ static void tegra_gpio_irq_handler(struct irq_desc *desc)
 }
 
 #ifdef CONFIG_PM_SLEEP
-static int tegra_gpio_resume(struct device *dev)
+static int tegra_gpio_resume_noirq(struct device *dev)
 {
 	struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
 	unsigned long flags;
@@ -554,7 +554,8 @@ static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
 #endif
 
 static const struct dev_pm_ops tegra_gpio_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
+	.suspend = tegra_gpio_suspend,
+	.resume_noirq = tegra_gpio_resume_noirq
 };
 
 static int tegra_gpio_probe(struct platform_device *pdev)
-- 
2.7.4