Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 5ab38985 authored by Abhijeet Dharmapurikar's avatar Abhijeet Dharmapurikar
Browse files

power: smb135x-charger: retry i2c read/writes 



The SMB chip could fail i2c transactions. Retry few times with
increasing sleep times between them.

Change-Id: I78a75d4bd9c1392f23da4e2715161bfd7128db28
Signed-off-by: default avatarAbhijeet Dharmapurikar <adharmap@codeaurora.org>
parent 95d9b560

drivers/power/smb135x-charger.c

+19 −0
Original line number Diff line number Diff line
@@ -359,12 +359,24 @@ struct smb135x_chg { 
	struct mutex			current_change_lock;

};



#define RETRY_COUNT 5

int retry_sleep_ms[RETRY_COUNT] = {

	10, 20, 30, 40, 50

};



static int __smb135x_read(struct smb135x_chg *chip, int reg,

				u8 *val)

{

	s32 ret;

	int retry_count = 0;



retry:

	ret = i2c_smbus_read_byte_data(chip->client, reg);

	if (ret < 0 && retry_count < RETRY_COUNT) {

		/* sleep for few ms before retrying */

		msleep(retry_sleep_ms[retry_count++]);

		goto retry;

	}

	if (ret < 0) {

		dev_err(chip->dev,

			"i2c read fail: can't read from %02x: %d\n", reg, ret);
@@ -380,8 +392,15 @@ static int __smb135x_write(struct smb135x_chg *chip, int reg, 
						u8 val)

{

	s32 ret;

	int retry_count = 0;



retry:

	ret = i2c_smbus_write_byte_data(chip->client, reg, val);

	if (ret < 0 && retry_count < RETRY_COUNT) {

		/* sleep for few ms before retrying */

		msleep(retry_sleep_ms[retry_count++]);

		goto retry;

	}

	if (ret < 0) {

		dev_err(chip->dev,

			"i2c write fail: can't write %02x to %02x: %d\n",