[U-Boot] [PATCH v3 4/4] cmd_eeprom: bug fix for i2c read/write

[Kuo-Jung Su]

From: Kuo-Jung Su <dantesu at faraday-tech.com>

The local pointer of address (i.e., addr) only gets
referenced under SPI mode, and it won't be appropriate
to pass only 1-byte addr[1] to i2c_read/i2c_write while
CONFIG_SYS_I2C_EEPROM_ADDR_LEN > 1.

1. In U-boot's I2C model, the address would be re-assembled
   to a byte string in MSB order inside I2C controller drivers.

2. The 'CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW' option which could
   be found at soft_i2c.c is always turned on in cmd_eeprom.c,
   the addr[0] always contains the device address with overflowed
   MSB address bits.

Signed-off-by: Kuo-Jung Su <dantesu at faraday-tech.com>
Cc: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
cc: Peter Tyser <ptyser at xes-inc.com>
Cc: Heiko Schocher <hs at denx.de>
Cc: Wolfgang Denk <wd at denx.de>
Cc: Stefan Roese <sr at denx.de>
Cc: Mischa Jonker <mjonker at synopsys.com>
---
 Changes for v3:
  - It turns out that what we did before 2013-11-13
    (i.e., cmd_eeprom: fix i2c_{read|write} usage if env is in I2C EEPROM)
    is still the best one, this patch simply rollback to it with coding
    style fix.

 Changes for v2:
  - Initial release

 common/cmd_eeprom.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/common/cmd_eeprom.c b/common/cmd_eeprom.c
index 02539c4..3924805 100644
--- a/common/cmd_eeprom.c
+++ b/common/cmd_eeprom.c
@@ -161,7 +161,7 @@ int eeprom_read (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt
 #if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
 		spi_read (addr, alen, buffer, len);
 #else
-		if (i2c_read (addr[0], addr[1], alen-1, buffer, len) != 0)
+		if (i2c_read(addr[0], offset, alen - 1, buffer, len))
 			rcode = 1;
 #endif
 		buffer += len;
@@ -339,7 +339,7 @@ int eeprom_write (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cn
 		/* Write is enabled ... now write eeprom value.
 		 */
 #endif
-		if (i2c_write (addr[0], addr[1], alen-1, buffer, len) != 0)
+		if (i2c_write(addr[0], offset, alen - 1, buffer, len))
 			rcode = 1;

 #endif
--
1.7.9.5