tree 06909c8abb39018490b62313e8f094fa64b79c9e
parent a984d9e15436a13d9ea086f275c235c5be2149c4
author David Collins <collinsd@codeaurora.org> 1378339626 -0700
committer David Collins <collinsd@codeaurora.org> 1381770901 -0700

bif: qpnp-bsi: correct maximum transaction delay time

The value QPNP_BSI_MAX_TRANSMIT_CYCLES is used to define the
timeout interval when sending or receiving BIF data words.
The MIPI-BIF specification allows for some skew in the length
of bits received from a slave.  A '1' can take up to 3.5 tau_bif
and a '0' can take up to 1.5 tau_bif.  Therefore, the maximum word
transmission time can be calculated as follows.

max-transmission-time =
= n(1)_max * t(1)_max + (17 - n(1)_max) * t(0)_max + t(stop)_min
= 8 * 3.5 tau_bif + 9 * 1.5 tau_bif + 4.5 tau_bif
= 46 tau_bif

Change QPNP_BSI_MAX_TRANSMIT_CYCLES to 46 in order to match the
value calculated from the MIPI-BIF specification.

Change-Id: Ibb199b54c99cc2de29ae54f6f891a667a30213b2
Signed-off-by: David Collins <collinsd@codeaurora.org>