提交 29fb08c3 编写于 作者: S Shinya Kuribayashi 提交者: Wolfram Sang

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: NTeppei Kamijou <teppei.kamijou.yb@renesas.com>
Signed-off-by: NShinya Kuribayashi <shinya.kuribayashi.px@renesas.com>
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
上级 ebd5ac16
......@@ -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;
}
......
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