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From: Jacopo Mondi <jacopo+renesas@jmondi.org>
To: kieran.bingham+renesas@ideasonboard.com,
	laurent.pinchart+renesas@ideasonboard.com,
	niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org
Cc: Jacopo Mondi <jacopo+renesas@jmondi.org>,
	linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] media: max9271: Fix GPIO enable/disable
Date: Fri, 20 Nov 2020 17:15:28 +0100	[thread overview]
Message-ID: <20201120161529.236447-2-jacopo+renesas@jmondi.org> (raw)
In-Reply-To: <20201120161529.236447-1-jacopo+renesas@jmondi.org>

Fix GPIO enable/disable operations which wrongly read the 0x0f register
to obtain the current mask of the enabled lines instead of using
the correct 0x0e register.

Also fix access to bit 0 of the register which is marked as reserved.

Fixes: 34009bffc1c6 ("media: i2c: Add RDACM20 driver")
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 drivers/media/i2c/max9271.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/i2c/max9271.c b/drivers/media/i2c/max9271.c
index 0f6f7a092a46..c247db569bab 100644
--- a/drivers/media/i2c/max9271.c
+++ b/drivers/media/i2c/max9271.c
@@ -223,12 +223,12 @@ int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask)
 {
 	int ret;
 
-	ret = max9271_read(dev, 0x0f);
+	ret = max9271_read(dev, 0x0e);
 	if (ret < 0)
 		return 0;
 
 	/* BIT(0) reserved: GPO is always enabled. */
-	ret |= gpio_mask | BIT(0);
+	ret |= (gpio_mask & ~BIT(0));
 	ret = max9271_write(dev, 0x0e, ret);
 	if (ret < 0) {
 		dev_err(&dev->client->dev, "Failed to enable gpio (%d)\n", ret);
@@ -245,12 +245,12 @@ int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask)
 {
 	int ret;
 
-	ret = max9271_read(dev, 0x0f);
+	ret = max9271_read(dev, 0x0e);
 	if (ret < 0)
 		return 0;
 
 	/* BIT(0) reserved: GPO cannot be disabled */
-	ret &= (~gpio_mask | BIT(0));
+	ret &= ~(gpio_mask | BIT(0));
 	ret = max9271_write(dev, 0x0e, ret);
 	if (ret < 0) {
 		dev_err(&dev->client->dev, "Failed to disable gpio (%d)\n", ret);
-- 
2.29.1


  reply	other threads:[~2020-11-20 16:15 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20 16:15 [PATCH 0/2] media: max9271: Fix GPIO handling Jacopo Mondi
2020-11-20 16:15 ` Jacopo Mondi [this message]
2020-11-20 19:12   ` [PATCH 1/2] media: max9271: Fix GPIO enable/disable Geert Uytterhoeven
2020-11-23 14:14   ` Kieran Bingham
2020-11-23 15:59   ` Sergei Shtylyov
2020-11-20 16:15 ` [PATCH 2/2] media: rdacm20: Enable GPIO1 explicitly Jacopo Mondi
2020-11-23 14:19   ` Kieran Bingham

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