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81687212ee
There is sporadic failures when more as one I2C slave is on the bus and the processor tries to communicate with more as one slave. The problem was seen on a mx35pdk (two I2C slaves, PMIC controller and CAN/RTC chip). The current driver uses the IIF bit in the status register to check if the bus is busy or not. According to the manual, this is not correct, because the IIB bit should be checked. Not only, to check if a transfer is finished must be checked the ICF bit, and this is not tested at all. This patch comes from analyse with a corresponding driver provided by Freescale as part of the LTIB tool. Comparing the two drivers, it appears that the current u-boot driver checks the wrong bits, and depending on race condition, the transfer can be successful or not. The patch gets rid also of own debug function (DPRINTF), replaced with the general debug(). Tested on Freescale mx35pdk. Signed-off-by: Stefano Babic <sbabic@denx.de> CC: Heiko Schocher <hs@denx.de> Acked-by: Heiko Schocher <hs@denx.de> |
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| .. | ||
| bfin-twi_i2c.c | ||
| davinci_i2c.c | ||
| fsl_i2c.c | ||
| Makefile | ||
| mvtwsi.c | ||
| mxc_i2c.c | ||
| omap24xx_i2c.c | ||
| omap24xx_i2c.h | ||
| omap1510_i2c.c | ||
| pca9564_i2c.c | ||
| ppc4xx_i2c.c | ||
| s3c24x0_i2c.c | ||
| s3c44b0_i2c.c | ||
| soft_i2c.c | ||
| spr_i2c.c | ||
| tsi108_i2c.c | ||