linux-kernel - [PATCH 5.8 64/85] gpio/aspeed-sgpio: dont enable all interrupts by default

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Message-Id: <20201005142117.807831256@linuxfoundation.org>
Date:   Mon,  5 Oct 2020 17:27:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jeremy Kerr <jk@...econstruct.com.au>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 64/85] gpio/aspeed-sgpio: dont enable all interrupts by default

From: Jeremy Kerr <jk@...econstruct.com.au>

[ Upstream commit bf0d394e885015941ed2d5724c0a6ed8d42dd95e ]

Currently, the IRQ setup for the SGPIO driver enables all interrupts in
dual-edge trigger mode. Since the default handler is handle_bad_irq, any
state change on input GPIOs will trigger bad IRQ warnings.

This change applies sensible IRQ defaults: single-edge trigger, and all
IRQs disabled.

Signed-off-by: Jeremy Kerr <jk@...econstruct.com.au>
Fixes: 7db47faae79b ("gpio: aspeed: Add SGPIO driver")
Reviewed-by: Joel Stanley <joel@....id.au>
Acked-by: Andrew Jeffery <andrew@...id.au>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpio-aspeed-sgpio.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-aspeed-sgpio.c b/drivers/gpio/gpio-aspeed-sgpio.c
index 5d678dbf1a621..a0eb00c024f62 100644
--- a/drivers/gpio/gpio-aspeed-sgpio.c
+++ b/drivers/gpio/gpio-aspeed-sgpio.c
@@ -452,17 +452,15 @@ static int aspeed_sgpio_setup_irqs(struct aspeed_sgpio *gpio,
 	irq->parents = &gpio->irq;
 	irq->num_parents = 1;
 
-	/* set IRQ settings and Enable Interrupt */
+	/* Apply default IRQ settings */
 	for (i = 0; i < ARRAY_SIZE(aspeed_sgpio_banks); i++) {
 		bank = &aspeed_sgpio_banks[i];
 		/* set falling or level-low irq */
 		iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type0));
 		/* trigger type is edge */
 		iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type1));
-		/* dual edge trigger mode. */
-		iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_type2));
-		/* enable irq */
-		iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_enable));
+		/* single edge trigger */
+		iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type2));
 	}
 
 	return 0;
-- 
2.25.1