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

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>
This commit is contained in:
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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3
drivers/i2c/busses/i2c-sh_mobile.c
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@ -469,6 +469,9 @@ static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id)
wake_up(&pd->wait);
}
/* defeat write posting to avoid spurious WAIT interrupts */
iic_rd(pd, ICSR);
return IRQ_HANDLED;
}