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i2c: omap: ack IRQ in parts 

According to flow diagrams on OMAP TRMs,
we should ACK the IRQ as they happen.

Signed-off-by: Felipe Balbi <balbi@ti.com>
[Ack the stat OMAP_I2C_STAT_AL in case of arbitration lost]
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Felipe Balbi 2012-09-12 16:28:04 +05:30 committed by Wolfram Sang
parent 66b9298878
commit 1d7afc9594
1 changed files with 16 additions and 12 deletions
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28
drivers/i2c/busses/i2c-omap.c
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@ -850,21 +850,19 @@ omap_i2c_isr(int this_irq, void *dev_id)
}
complete:
/*
* Ack the stat in one go, but [R/X]DR and [R/X]RDY should be
* acked after the data operation is complete.
* Ref: TRM SWPU114Q Figure 18-31
*/
omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat &
~(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
if (stat & OMAP_I2C_STAT_NACK)
if (stat & OMAP_I2C_STAT_NACK) {
err |= OMAP_I2C_STAT_NACK;
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK);
omap_i2c_complete_cmd(dev, err);
return IRQ_HANDLED;
}
if (stat & OMAP_I2C_STAT_AL) {
dev_err(dev->dev, "Arbitration lost\n");
err |= OMAP_I2C_STAT_AL;
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_AL);
omap_i2c_complete_cmd(dev, err);
return IRQ_HANDLED;
}
/*
@ -941,12 +939,18 @@ omap_i2c_isr(int this_irq, void *dev_id)
if (stat & OMAP_I2C_STAT_ROVR) {
dev_err(dev->dev, "Receive overrun\n");
dev->cmd_err |= OMAP_I2C_STAT_ROVR;
err |= OMAP_I2C_STAT_ROVR;
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ROVR);
omap_i2c_complete_cmd(dev, err);
return IRQ_HANDLED;
}
if (stat & OMAP_I2C_STAT_XUDF) {
dev_err(dev->dev, "Transmit underflow\n");
dev->cmd_err |= OMAP_I2C_STAT_XUDF;
err |= OMAP_I2C_STAT_XUDF;
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XUDF);
omap_i2c_complete_cmd(dev, err);
return IRQ_HANDLED;
}
} while (stat);