i2c-eg20t: Rework pch_i2c_wait_for_bus_idle to reduce wait time

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If you insert several i2c transfers, the driver might start the next one
while the STOP bit of the previous transfer is still on the bus, marking
the bus as busy.
pch_i2c_wait_for_bus_idle does an msleep(20) delaying the next transfer
by >=20ms. Reduce wait time by actively waiting 5 us once, then using
usleep_range.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Acked-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

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Alexander Stein 2012-02-20 09:14:16 +01:00 • committed by Wolfram Sang

parent c62c3ca55e

commit 0836c80901

1 changed files with 21 additions and 15 deletions

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drivers/i2c/busses/i2c-eg20t.c

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