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| author | Wayne Zou <b36644@freescale.com> | 2011-08-22 10:45:25 +0800 |
|---|---|---|
| committer | Wayne Zou <b36644@freescale.com> | 2011-08-22 10:45:25 +0800 |
| commit | 10ddb7764160b44205152cb52f95986736367f01 (patch) | |
| tree | 49ab49bfc3926723ba21d805c309a775b06741a5 /board/freescale/mx53_smd | |
| parent | 41a2678fec8dbe36e079aee9f1ed7a961d6be14c (diff) | |
| download | u-boot-imx-10ddb7764160b44205152cb52f95986736367f01.zip u-boot-imx-10ddb7764160b44205152cb52f95986736367f01.tar.gz u-boot-imx-10ddb7764160b44205152cb52f95986736367f01.tar.bz2 | |
ENGR00155138 mx53_smd/mx53_loco: Add i2c retry to fix DA9053 i2c NAK issue
when board boots up, during the iMX53 SOC does DA9053 Read/Write
operation, it writes slave address and wait for ACK . Instead of ACK
PMIC sends NAK. A workaround fix is provided as a part of retries to
fix I2C NAK for very first access.
Signed-off-by: Wayne Zou <b36644@freescale.com>
Diffstat (limited to 'board/freescale/mx53_smd')
| -rw-r--r-- | board/freescale/mx53_smd/mx53_smd.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/board/freescale/mx53_smd/mx53_smd.c b/board/freescale/mx53_smd/mx53_smd.c index b698fd3..b9bd250 100644 --- a/board/freescale/mx53_smd/mx53_smd.c +++ b/board/freescale/mx53_smd/mx53_smd.c @@ -408,10 +408,19 @@ static void setup_i2c(unsigned int module_base) void setup_pmic_voltages(void) { uchar value; + int retries = 10, ret = -1; + i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); /* increase VDDGP as 1.25V for 1GHZ */ value = 0x5e; - i2c_write(0x48, 0x2e, 1, &value, 1); + do { + if (0 != i2c_write(0x48, 0x2e, 1, &value, 1)) { + printf("da9052_i2c_is_connected - i2c write failed.....\n"); + } else { + printf("da9052_i2c_is_connected - i2c write success....\n"); + ret = 0; + } + } while (ret != 0 && retries--); i2c_read(0x48, 60, 1, &value, 1); value |= 0x1; i2c_write(0x48, 60, 1, &value, 1); |