i2c: i2c-sh_mobile: fix spurious transfer request timed out

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Ensure that any of preceding register write operations to the I2C
hardware block reached the module, and the write data is reflected
in the registers, before leaving the interrupt handler.

Otherwise, we'll suffer from spurious WAIT interrupts that lead to
'Transfer request timed out' message, and the transaction failed.

Reported-by: Teppei Kamijou <teppei.kamijou.yb@renesas.com>
Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

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Shinya Kuribayashi 2012-10-24 19:58:31 +09:00 • committed by Wolfram Sang

parent ebd5ac165f

commit 29fb08c300

1 changed files with 3 additions and 0 deletions

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drivers/i2c/busses/i2c-sh_mobile.c

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