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Commit 4b83626a authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

[media] em28xx: convert i2c wait completion logic to use jiffies 



The I2C wait completion/timeout logic currently assumes that
msleep(5) will wait exaclty 5 ms. This is not true at all,
as it depends on CONFIG_HZ.

Convert it to use jiffies, in order to not wait for more time
than needed.

Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 5022a208

drivers/media/usb/em28xx/em28xx-i2c.c

+31 −30
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/kernel.h>

#include <linux/usb.h>

#include <linux/i2c.h>

#include <linux/jiffies.h>



#include "em28xx.h"

#include "tuner-xc2028.h"
@@ -48,8 +49,8 @@ MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); 
 */

static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)

{

	unsigned long timeout = jiffies + msecs_to_jiffies(EM2800_I2C_XFER_TIMEOUT);

	int ret;

	int write_timeout;

	u8 b2[6];



	if (len < 1 || len > 4)
@@ -74,14 +75,14 @@ static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len) 
		return (ret < 0) ? ret : -EIO;

	}

	/* wait for completion */

	for (write_timeout = EM2800_I2C_XFER_TIMEOUT; write_timeout > 0;

	     write_timeout -= 5) {

	while (time_is_after_jiffies(timeout)) {

		ret = dev->em28xx_read_reg(dev, 0x05);

		if (ret == 0x80 + len - 1) {

		if (ret == 0x80 + len - 1)

			return len;

		} else if (ret == 0x94 + len - 1) {

		if (ret == 0x94 + len - 1) {

			return -ENODEV;

		} else if (ret < 0) {

		}

		if (ret < 0) {

			em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",

				    ret);

			return ret;
@@ -98,9 +99,9 @@ static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len) 
 */

static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)

{

	unsigned long timeout = jiffies + msecs_to_jiffies(EM2800_I2C_XFER_TIMEOUT);

	u8 buf2[4];

	int ret;

	int read_timeout;

	int i;



	if (len < 1 || len > 4)
@@ -117,14 +118,14 @@ static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len) 
	}



	/* wait for completion */

	for (read_timeout = EM2800_I2C_XFER_TIMEOUT; read_timeout > 0;

	     read_timeout -= 5) {

	while (time_is_after_jiffies(timeout)) {

		ret = dev->em28xx_read_reg(dev, 0x05);

		if (ret == 0x84 + len - 1) {

		if (ret == 0x84 + len - 1)

			break;

		} else if (ret == 0x94 + len - 1) {

		if (ret == 0x94 + len - 1) {

			return -ENODEV;

		} else if (ret < 0) {

		}

		if (ret < 0) {

			em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",

				    ret);

			return ret;
@@ -168,7 +169,8 @@ static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr) 
static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,

				 u16 len, int stop)

{

	int write_timeout, ret;

	unsigned long timeout = jiffies + msecs_to_jiffies(EM2800_I2C_XFER_TIMEOUT);

	int ret;



	if (len < 1 || len > 64)

		return -EOPNOTSUPP;
@@ -191,16 +193,16 @@ static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf, 
		}

	}



	/* Check success of the i2c operation */

	for (write_timeout = EM2800_I2C_XFER_TIMEOUT; write_timeout > 0;

	     write_timeout -= 5) {

	/* wait for completion */

	while (time_is_after_jiffies(timeout)) {

		ret = dev->em28xx_read_reg(dev, 0x05);

		if (ret == 0) { /* success */

		if (ret == 0) /* success */

			return len;

		} else if (ret == 0x10) {

		if (ret == 0x10) {

			return -ENODEV;

		} else if (ret < 0) {

			em28xx_warn("failed to read i2c transfer status from bridge (error=%i)\n",

		}

		if (ret < 0) {

			em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",

				    ret);

			return ret;

		}
@@ -211,6 +213,7 @@ static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf, 
		 * (even with high payload) ...

		 */

	}



	em28xx_warn("write to i2c device at 0x%x timed out\n", addr);

	return -EIO;

}
@@ -248,21 +251,19 @@ static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len) 


	/* Check success of the i2c operation */

	ret = dev->em28xx_read_reg(dev, 0x05);

	if (ret == 0) /* success */

		return len;

	if (ret < 0) {

		em28xx_warn("failed to read i2c transfer status from bridge (error=%i)\n",

		em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",

			    ret);

		return ret;

	}

	if (ret > 0) {

		if (ret == 0x10) {

	if (ret == 0x10)

		return -ENODEV;

		} else {



	em28xx_warn("unknown i2c error (status=%i)\n", ret);

	return -EIO;

}

	}

	return len;

}



/*

 * em28xx_i2c_check_for_device()