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i2c: mediatek: Fixup i2c ack error interrupt handling

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When occur i2c ack error, i2c controller generate two interrupts,
first is the ack error interrupt, then the complete interrupt.
i2c interrupt handler should keep the two interrupt value, and only
call complete() for the complete interrupt.

Signed-off-by: Liguo Zhang <liguo.zhang@mediatek.com>
Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Eddie Huang 2015-08-06 15:22:11 +08:00 committed by Wolfram Sang
parent ea89ef1f7b
commit 28c0a8433d
1 changed files with 11 additions and 4 deletions
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15
drivers/i2c/busses/i2c-mt65xx.c
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@ -557,15 +557,22 @@ static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id)
{
struct mtk_i2c *i2c = dev_id;
u16 restart_flag = 0;
u16 intr_stat;
if (i2c->dev_comp->auto_restart)
restart_flag = I2C_RS_TRANSFER;
i2c->irq_stat = readw(i2c->base + OFFSET_INTR_STAT);
writew(restart_flag | I2C_HS_NACKERR | I2C_ACKERR
| I2C_TRANSAC_COMP, i2c->base + OFFSET_INTR_STAT);
intr_stat = readw(i2c->base + OFFSET_INTR_STAT);
writew(intr_stat, i2c->base + OFFSET_INTR_STAT);
complete(&i2c->msg_complete);
/*
* when occurs ack error, i2c controller generate two interrupts
* first is the ack error interrupt, then the complete interrupt
* i2c->irq_stat need keep the two interrupt value.
*/
i2c->irq_stat |= intr_stat;
if (i2c->irq_stat & (I2C_TRANSAC_COMP | restart_flag))
complete(&i2c->msg_complete);
return IRQ_HANDLED;
}