linux-kernel - [PATCH 1/3] gpio: bcm-kona: Fix GPIO lock/unlock for banks above bank 0

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Message-Id: <20250130-kona-gpio-fixes-v1-1-dd61e0c0a9e7@gmail.com>
Date: Thu, 30 Jan 2025 18:10:37 +0100
From: Artur Weber <aweber.kernel@...il.com>
To: Ray Jui <rjui@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Scott Branden <sbranden@...adcom.com>, 
 Markus Mayer <markus.mayer@...aro.org>, Tim Kryger <tim.kryger@...aro.org>, 
 Matt Porter <matt.porter@...aro.org>, Markus Mayer <mmayer@...adcom.com>, 
 Christian Daudt <csd@...adcom.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 ~postmarketos/upstreaming@...ts.sr.ht, 
 Artur Weber <aweber.kernel@...il.com>
Subject: [PATCH 1/3] gpio: bcm-kona: Fix GPIO lock/unlock for banks above
 bank 0

The GPIO lock/unlock functions clear/write a bit to the relevant
register for each bank. However, due to an oversight the bit that
was being written was based on the total GPIO number, not the index
of the GPIO within the relevant bank, causing it to fail for any
GPIO above 32 (thus any GPIO for banks above bank 0).

Fix lock/unlock for these banks by using the correct bit.

Fixes: bdb93c03c550 ("gpio: bcm281xx: Centralize register locking")
Signed-off-by: Artur Weber <aweber.kernel@...il.com>
---
 drivers/gpio/gpio-bcm-kona.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-bcm-kona.c b/drivers/gpio/gpio-bcm-kona.c
index 5321ef98f4427d004e62f71d00df6d49bb465ddd..77bd4ec93a231472d7bc40db9d5db12d20bb1611 100644
--- a/drivers/gpio/gpio-bcm-kona.c
+++ b/drivers/gpio/gpio-bcm-kona.c
@@ -86,11 +86,12 @@ static void bcm_kona_gpio_lock_gpio(struct bcm_kona_gpio *kona_gpio,
 	u32 val;
 	unsigned long flags;
 	int bank_id = GPIO_BANK(gpio);
+	int bit = GPIO_BIT(gpio);
 
 	raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 
 	val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id));
-	val |= BIT(gpio);
+	val |= BIT(bit);
 	bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val);
 
 	raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
@@ -102,11 +103,12 @@ static void bcm_kona_gpio_unlock_gpio(struct bcm_kona_gpio *kona_gpio,
 	u32 val;
 	unsigned long flags;
 	int bank_id = GPIO_BANK(gpio);
+	int bit = GPIO_BIT(gpio);
 
 	raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 
 	val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id));
-	val &= ~BIT(gpio);
+	val &= ~BIT(bit);
 	bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val);
 
 	raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);

-- 
2.48.1