https://github.com/torvalds/linux
Revision cf8ce8b80f8bf9669f6ec4e71e16668430febdac authored by Russell King on 15 December 2019, 16:39:05 UTC, committed by Wolfram Sang on 09 January 2020, 21:21:08 UTC
The I2C specification states that tsu:sto for standard mode timing must
be at minimum 4us. Pictographically, this is:

SCL: ____/~~~~~~~~~
SDA: _________/~~~~
       ->|    |<- 4us minimum

We are currently waiting 2.5us between asserting SCL and SDA, which is
in violation of the standard. Adjust the timings to ensure that we meet
what is stipulated as the minimum timings to ensure that all devices
correctly interpret the STOP bus transition.

This is more important than trying to generate a square wave with even
duty cycle.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
1 parent 3b722da
History
Tip revision: cf8ce8b80f8bf9669f6ec4e71e16668430febdac authored by Russell King on 15 December 2019, 16:39:05 UTC
i2c: fix bus recovery stop mode timing
Tip revision: cf8ce8b
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