On Thu, Jun 28, 2012 at 08:41:32PM +0530, Shubhrajyoti D wrote:

From: Vikram Pandita <redacted>

In case a peripheral is driving SDA bus low (ie. a start condition), provide
a constant clock output using the test mode of the OMAP I2C controller to
try and clear the bus. Soft reset I2C controller after attempting the bus clear
to ensure that controller is in a good state.

Based upon Vikram Pandita's patch from TI Android 3.0.
I acknowledge the contributions and suggestions of Jon and Hemant.

A couple differences from the original patch ...
1. Add a new function for bus clear
2. Ensure that the CON.I2C_EN bit is set when using the SYSTEST feature to
   output a permanent clock. This bit needs to be set and typically it would
   be set by the unidle function but this is not the case for all OMAP
   generations.
3. Program the SYSTEST setting only the bits we care about. However, restore
   SYSTEST registers to there original state as some OMAP generations do not
   implement perform a soft-reset.
4. Clear the CON register after performing the bus clear, so when we call the
   init function the controller is disabled and the init function will
   re-enable later.

Original patch can be found here:
http://git.omapzoom.org/?p=kernel/omap.git;a=commit;h=a2ab04192ba25e60f95ba1ff3af5601a2d7b5bd1

Signed-off-by: Vikram Pandita <redacted>
Signed-off-by: Jon Hunter <redacted>
Signed-off-by: Shubhrajyoti D <redacted>

This has to wait a little bit until I can spend time on the recovery
framework (which is still in the queue, sadly :( ). There might be some
consolidation.

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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