[PATCH v3] board: ti: common: board_detect: Fix EEPROM offset read for 1-byte

[Neha Malcom Francis]

Hi Prasanth,

On 30/10/23 22:34, Prasanth Babu Mantena wrote:
> EEPROM detection logic in ti_i2c_eeprom_get() involves reading
> the total size and the 1-byte size with an offset 1. The commit
> 9f393a2d7af8 ("board: ti: common: board_detect: Fix EEPROM read
> quirk for 2-byte") that attempts to fix this uses a wrong pointer to
> compare.
> 
> The value with one offset is read into offset_test, but the pointer
> used to match was still ep, resulting in an invalid comparison of the
> values. The intent is to identify bad 2-byte addressing eeproms that
> get stuck on the successive reads.
> 
> Fixes: 9f393a2d7af8 (board: ti: common: board_detect: Fix EEPROM read quirk for 2-byte)
> Signed-off-by: Prasanth Babu Mantena <p-mantena at ti.com>
> Tested-by: Matwey V. Kornilov <matwey.kornilov at gmail.com>
> ---
> v3 <--> v2:
> Improved and concise commit description.
> 
> v2 <--> v1:
> Fix inplace for the else condition of CONFIG_IS_ENABLED(DM_I2C).
> Improved commit message.
> 
>   board/ti/common/board_detect.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/board/ti/common/board_detect.c b/board/ti/common/board_detect.c
> index 9a53884c98..869f7a47f8 100644
> --- a/board/ti/common/board_detect.c
> +++ b/board/ti/common/board_detect.c
> @@ -128,7 +128,7 @@ static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
>   
>   	rc = dm_i2c_read(dev, 0x1, &offset_test, sizeof(offset_test));
>   
> -	if (*((u32 *)ep) != (header & 0xFF))
> +	if (offset_test != ((header >> 8) & 0xFF))
>   		one_byte_addressing = false;
>   
>   	/* Corrupted data??? */
> @@ -180,7 +180,7 @@ static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
>   
>   	rc = i2c_read(dev_addr, 0x1, byte, &offset_test, sizeof(offset_test));
>   
> -	if (*((u32 *)ep) != (header & 0xFF))
> +	if (offset_test != ((header >> 8) & 0xFF))
>   		one_byte_addressing = false;
>   
>   	/* Corrupted data??? */

Reviewed-by: Neha Malcom Francis <n-francis at ti.com>

-- 
Thanking You
Neha Malcom Francis