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05 April 2024, 19:05:47 UTC
Revision 0bbca274a31c2366414d8d3f95e03d1c4674d93f authored by Ville Syrjälä on 07 March 2016, 15:56:57 UTC, committed by Jani Nikula on 11 March 2016, 08:23:28 UTC 
drm/i915: Actually retry with bit-banging after GMBUS timeout
 
After the GMBUS transfer times out, we set force_bit=1 and
return -EAGAIN expecting the i2c core to call the .master_xfer
hook again so that we will retry the same transfer via bit-banging.
This is in case the gmbus hardware is somehow faulty.

Unfortunately we left adapter->retries to 0, meaning the i2c core
didn't actually do the retry. Let's tell the core we want one retry
when we return -EAGAIN.

Note that i2c-algo-bit also uses this retry count for some internal
retries, so we'll end up increasing those a bit as well.

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: drm-intel-fixes@lists.freedesktop.org
Fixes: bffce907d640 ("drm/i915: abstract i2c bit banging fallback in gmbus xfer")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1457366220-29409-2-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit 8b1f165a4a8f64c28cf42d10e1f4d3b451dedc51)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
1 parent 2f79190
History
Tip revision: 0bbca274a31c2366414d8d3f95e03d1c4674d93f authored by Ville Syrjälä on 07 March 2016, 15:56:57 UTC
drm/i915: Actually retry with bit-banging after GMBUS timeout
Tip revision: 0bbca27
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