diff mbox series

[v3,16/19] media: i2c: rdacm20: Replace goto with a loop

Message ID 20210319164148.199192-17-jacopo+renesas@jmondi.org (mailing list archive)
State New, archived
Headers show
Series media: gmsl: Reliability improvement | expand

Commit Message

Jacopo Mondi March 19, 2021, 4:41 p.m. UTC
During the camera module initialization the image sensor PID is read to
verify it can correctly be identified. The current implementation is
rather confused and uses a loop implemented with a label and a goto.

Replace it with a more compact for() loop.

No functional changes intended.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 drivers/media/i2c/rdacm20.c | 29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

Comments

Laurent Pinchart March 20, 2021, 4:17 p.m. UTC | #1
Hi Jacopo,

Thank you for the patch.

On Fri, Mar 19, 2021 at 05:41:45PM +0100, Jacopo Mondi wrote:
> During the camera module initialization the image sensor PID is read to
> verify it can correctly be identified. The current implementation is
> rather confused and uses a loop implemented with a label and a goto.
> 
> Replace it with a more compact for() loop.
> 
> No functional changes intended.
> 
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  drivers/media/i2c/rdacm20.c | 29 +++++++++++++----------------
>  1 file changed, 13 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
> index 7bdcfafa6c10..760705dd2918 100644
> --- a/drivers/media/i2c/rdacm20.c
> +++ b/drivers/media/i2c/rdacm20.c
> @@ -59,6 +59,8 @@
>   */
>  #define OV10635_PIXEL_RATE		(44000000)
>  
> +#define OV10635_PID_TIMEOUT		3
> +
>  static const struct ov10635_reg {
>  	u16	reg;
>  	u8	val;
> @@ -438,7 +440,7 @@ static int rdacm20_get_fmt(struct v4l2_subdev *sd,
>  static int rdacm20_init(struct v4l2_subdev *sd, unsigned int val)
>  {
>  	struct rdacm20_device *dev = sd_to_rdacm20(sd);
> -	unsigned int retry = 3;
> +	unsigned int i;
>  	int ret;
>  
>  	/*
> @@ -478,23 +480,18 @@ static int rdacm20_init(struct v4l2_subdev *sd, unsigned int val)
>  		return ret;
>  	usleep_range(10000, 15000);
>  
> -again:
> -	ret = ov10635_read16(dev, OV10635_PID);
> -	if (ret < 0) {
> -		if (retry--)
> -			goto again;
> +	for (i = 0; i < OV10635_PID_TIMEOUT; ++i) {

As commented on a previous patch, this macro is used here only, I would
have made it local.

> +		ret = ov10635_read16(dev, OV10635_PID);
> +		if (ret == OV10635_VERSION)
> +			break;
> +		else if (ret >= 0)
> +			/* Sometimes we get a successful read but a wrong ID. */
> +			dev_dbg(dev->dev, "OV10635 ID mismatch (%d)\n", ret);
>  
> -		dev_err(dev->dev, "OV10635 ID read failed (%d)\n",
> -			ret);
> -		return -ENXIO;
> +		usleep_range(1000, 2000);
>  	}
> -
> -	if (ret != OV10635_VERSION) {
> -		if (retry--)
> -			goto again;
> -
> -		dev_err(dev->dev, "OV10635 ID mismatch (0x%04x)\n",
> -			ret);

Blank line ?

> +	if (i == OV10635_PID_TIMEOUT) {
> +		dev_err(dev->dev, "OV10635 ID read failed (%d)\n", ret);
>  		return -ENXIO;
>  	}
>
diff mbox series

Patch

diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
index 7bdcfafa6c10..760705dd2918 100644
--- a/drivers/media/i2c/rdacm20.c
+++ b/drivers/media/i2c/rdacm20.c
@@ -59,6 +59,8 @@ 
  */
 #define OV10635_PIXEL_RATE		(44000000)
 
+#define OV10635_PID_TIMEOUT		3
+
 static const struct ov10635_reg {
 	u16	reg;
 	u8	val;
@@ -438,7 +440,7 @@  static int rdacm20_get_fmt(struct v4l2_subdev *sd,
 static int rdacm20_init(struct v4l2_subdev *sd, unsigned int val)
 {
 	struct rdacm20_device *dev = sd_to_rdacm20(sd);
-	unsigned int retry = 3;
+	unsigned int i;
 	int ret;
 
 	/*
@@ -478,23 +480,18 @@  static int rdacm20_init(struct v4l2_subdev *sd, unsigned int val)
 		return ret;
 	usleep_range(10000, 15000);
 
-again:
-	ret = ov10635_read16(dev, OV10635_PID);
-	if (ret < 0) {
-		if (retry--)
-			goto again;
+	for (i = 0; i < OV10635_PID_TIMEOUT; ++i) {
+		ret = ov10635_read16(dev, OV10635_PID);
+		if (ret == OV10635_VERSION)
+			break;
+		else if (ret >= 0)
+			/* Sometimes we get a successful read but a wrong ID. */
+			dev_dbg(dev->dev, "OV10635 ID mismatch (%d)\n", ret);
 
-		dev_err(dev->dev, "OV10635 ID read failed (%d)\n",
-			ret);
-		return -ENXIO;
+		usleep_range(1000, 2000);
 	}
-
-	if (ret != OV10635_VERSION) {
-		if (retry--)
-			goto again;
-
-		dev_err(dev->dev, "OV10635 ID mismatch (0x%04x)\n",
-			ret);
+	if (i == OV10635_PID_TIMEOUT) {
+		dev_err(dev->dev, "OV10635 ID read failed (%d)\n", ret);
 		return -ENXIO;
 	}