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Problems encountered by i2c-gpio drivers #347

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philo-micas opened this issue Oct 11, 2023 · 0 comments

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philo-micas commented Oct 11, 2023

Code Path：drivers/i2c/algos/i2c-algo-bit.c

Issue 1：An occasional I2C deadlock (SCL is high voltage level and SDA is low voltage level) cannot be recovered, making the I2C controller unusable.
Issue 2：Insert a faulty optical module with SDA and GND short-circuited， the I2C GPIO controller cannot identify the exception, and all the data read is 0 (The access is successful from the I2C protocol)

Regarding this issue, our solution is:

Issue1：The solution is the same as the i2c-i801 driver, which also imports 9 clock unlock functions
Issue2：Add I2C-GPIO voltage level detection to determine SCL and SDA voltage levels before I2C begins transmission. If the SCL and SDA voltage levels are not high at the same time, a failure is returned.

philo-micas mentioned this issue

Summary of some kernel issues #341

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