From b23bb1c1622695d6a8f23ab14f4d193dc3db53e6 Mon Sep 17 00:00:00 2001 From: Emanuele Ghidoli Date: Fri, 5 Sep 2025 21:10:32 -0400 Subject: [PATCH] gpio: pca953x: fix IRQ storm on system wake up [ Upstream commit 3e38f946062b4845961ab86b726651b4457b2af8 ] If an input changes state during wake-up and is used as an interrupt source, the IRQ handler reads the volatile input register to clear the interrupt mask and deassert the IRQ line. However, the IRQ handler is triggered before access to the register is granted, causing the read operation to fail. As a result, the IRQ handler enters a loop, repeatedly printing the "failed reading register" message, until `pca953x_resume()` is eventually called, which restores the driver context and enables access to registers. Fix by disabling the IRQ line before entering suspend mode, and re-enabling it after the driver context is restored in `pca953x_resume()`. An IRQ can be disabled with disable_irq() and still wake the system as long as the IRQ has wake enabled, so the wake-up functionality is preserved. Fixes: b76574300504 ("gpio: pca953x: Restore registers after suspend/resume cycle") Cc: stable@vger.kernel.org Signed-off-by: Emanuele Ghidoli Signed-off-by: Francesco Dolcini Reviewed-by: Andy Shevchenko Tested-by: Geert Uytterhoeven Link: https://lore.kernel.org/r/20250512095441.31645-1-francesco@dolcini.it Signed-off-by: Bartosz Golaszewski [ Apply directly to suspend/resume functions ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/gpio/gpio-pca953x.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 64a4128b9a422..117f5a00ee703 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -1144,6 +1144,9 @@ static int pca953x_suspend(struct device *dev) struct pca953x_chip *chip = dev_get_drvdata(dev); mutex_lock(&chip->i2c_lock); + /* Disable IRQ to prevent early triggering while regmap "cache only" is on */ + if (chip->client->irq > 0) + disable_irq(chip->client->irq); regcache_cache_only(chip->regmap, true); mutex_unlock(&chip->i2c_lock); @@ -1169,6 +1172,8 @@ static int pca953x_resume(struct device *dev) } mutex_lock(&chip->i2c_lock); + if (chip->client->irq > 0) + enable_irq(chip->client->irq); regcache_cache_only(chip->regmap, false); regcache_mark_dirty(chip->regmap); ret = pca953x_regcache_sync(dev); -- 2.47.3