On Fri, Feb 28, 2014 at 11:32:05AM +0100, mike.looijm...@topic.nl wrote: > From: Mike Looijmans <milo-softw...@users.sourceforge.net> > > Having a board where the I2C bus locks up occasionally made it clear > that the bus recovery in the i2c-davinci driver will only work on > some boards, because on regular boards, this will only toggle GPIO > lines that aren't muxed to the actual pins. > > The I2C controller has the built-in capability to bit-bang its lines. > Use this to implement a generic recovery routine that puts the > controller in GPIO mode and pulse the clk lines until both SDA and > SCL return to a high state. > > Because the controller must be held in reset while doing so, the > recovery routine must re-init the controller. Since this was already > being done after each call to i2c_recover_bus, move that call into > the recovery routine as well. > > Tested on a custom board with OMAP-L138, and after this change, the > board can recover from chips keeping SDA low. > > Note: This is an adapted port from 2.6.37 code, and was only tested > with that kernel.
What about using struct i2c_bus_recovery_info, so the actual recovery logic is taken from the core? Thanks, Wolfram
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