tree 8d3b6ac565360c27b91b44ae58dc987c7f0b2c9b
parent 7cbcb136a7d703f1bd590979a3d07348fe1bc81d
author Alexander Shiyan <shc_work@mail.ru> 1399535798 +0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1403225014 -0700

w1: mxc_w1: Optimize mxc_w1_ds2_reset_bus()

According to the i.MX reference manual, the reset procedure and
"presence" pulse takes 511 and 512 us, respectively. Measurement for
i.MX27 is about 1100 us. There is no need to wait Reset+Presence
more than this time.
This patch optimizes mxc_w1_ds2_reset_bus() function to use proper
value for delay after w1 bus reset. Nevertheless, a small margin for
the timeout has been added for the case if clock frequency is inaccurate.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>