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i2c: xiic: Defer xiic_wakeup() and __xiic_start_xfer() in xiic_process() 

The __xiic_start_xfer() manipulates the interrupt flags, xiic_wakeup()
may result in return from xiic_xfer() early. Defer both to the end of
the xiic_process() interrupt thread, so that they are executed after
all the other interrupt bits handling completed and once it completely
safe to perform changes to the interrupt bits in the hardware.

Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Marek Vasut 2021-08-23 23:41:42 +02:00 committed by Wolfram Sang
parent 861dcffe1b
commit 743e227a89
1 changed files with 26 additions and 11 deletions
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37
drivers/i2c/busses/i2c-xiic.c
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@ -375,6 +375,9 @@ static irqreturn_t xiic_process(int irq, void *dev_id)
struct xiic_i2c *i2c = dev_id;
u32 pend, isr, ier;
u32 clr = 0;
int xfer_more = 0;
int wakeup_req = 0;
int wakeup_code = 0;
/* Get the interrupt Status from the IPIF. There is no clearing of
* interrupts in the IPIF. Interrupts must be cleared at the source.
@ -411,10 +414,14 @@ static irqreturn_t xiic_process(int irq, void *dev_id)
*/
xiic_reinit(i2c);
if (i2c->rx_msg)
xiic_wakeup(i2c, STATE_ERROR);
if (i2c->tx_msg)
xiic_wakeup(i2c, STATE_ERROR);
if (i2c->rx_msg) {
wakeup_req = 1;
wakeup_code = STATE_ERROR;
}
if (i2c->tx_msg) {
wakeup_req = 1;
wakeup_code = STATE_ERROR;
}
}
if (pend & XIIC_INTR_RX_FULL_MASK) {
/* Receive register/FIFO is full */
@ -448,8 +455,7 @@ static irqreturn_t xiic_process(int irq, void *dev_id)
i2c->tx_msg++;
dev_dbg(i2c->adap.dev.parent,
"%s will start next...\n", __func__);
__xiic_start_xfer(i2c);
xfer_more = 1;
}
}
}
@ -463,11 +469,13 @@ static irqreturn_t xiic_process(int irq, void *dev_id)
if (!i2c->tx_msg)
goto out;
if ((i2c->nmsgs == 1) && !i2c->rx_msg &&
xiic_tx_space(i2c) == 0)
xiic_wakeup(i2c, STATE_DONE);
wakeup_req = 1;
if (i2c->nmsgs == 1 && !i2c->rx_msg &&
xiic_tx_space(i2c) == 0)
wakeup_code = STATE_DONE;
else
xiic_wakeup(i2c, STATE_ERROR);
wakeup_code = STATE_ERROR;
}
if (pend & (XIIC_INTR_TX_EMPTY_MASK | XIIC_INTR_TX_HALF_MASK)) {
/* Transmit register/FIFO is empty or ½ empty */
@ -491,7 +499,7 @@ static irqreturn_t xiic_process(int irq, void *dev_id)
if (i2c->nmsgs > 1) {
i2c->nmsgs--;
i2c->tx_msg++;
__xiic_start_xfer(i2c);
xfer_more = 1;
} else {
xiic_irq_dis(i2c, XIIC_INTR_TX_HALF_MASK);
@ -509,6 +517,13 @@ static irqreturn_t xiic_process(int irq, void *dev_id)
dev_dbg(i2c->adap.dev.parent, "%s clr: 0x%x\n", __func__, clr);
xiic_setreg32(i2c, XIIC_IISR_OFFSET, clr);
if (xfer_more)
__xiic_start_xfer(i2c);
if (wakeup_req)
xiic_wakeup(i2c, wakeup_code);
WARN_ON(xfer_more && wakeup_req);
mutex_unlock(&i2c->lock);
return IRQ_HANDLED;
}