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net: ieee802154: adf7242: Rework IRQ and packet handling 

* Stop unconditionally polling for RC_STATUS_PHY_RDY at the entry of
the threaded IRQ handler. Once IRQ_RX_PKT_RCVD is received we can
read immediately the packet from the buffer. However we still need
to wait afterwards for RC_STATUS_PHY_RDY, to make sure that the
ACK (in case requested) was processed and send out by the
Radio Controller, before we issue the next CMD_RC_RX.
This significantly reduces the overall time spend in the threaded
IRQ handler.

 * Avoid raise condition between xmit and coincident packet reception,
by disabling the IRQ and clearing the IRQ status upon xmit entry.

 * Introduce helper functions adf7242_clear_irqstat() and adf7242_cmd_rx()

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Stefan Schmidt <stefan@osg.samsung.com>
This commit is contained in:
Michael Hennerich 2017-11-28 13:53:15 +01:00 committed by Stefan Schmidt
parent c78c1b0139
commit 8f1878a182
1 changed files with 39 additions and 15 deletions
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54
drivers/net/ieee802154/adf7242.c
View File

@ -563,6 +563,22 @@ static int adf7242_verify_firmware(struct adf7242_local *lp,
return 0;
}
static void adf7242_clear_irqstat(struct adf7242_local *lp)
{
adf7242_write_reg(lp, REG_IRQ1_SRC1, IRQ_CCA_COMPLETE | IRQ_SFD_RX |
IRQ_SFD_TX | IRQ_RX_PKT_RCVD | IRQ_TX_PKT_SENT |
IRQ_FRAME_VALID | IRQ_ADDRESS_VALID | IRQ_CSMA_CA);
}
static int adf7242_cmd_rx(struct adf7242_local *lp)
{
/* Wait until the ACK is sent */
adf7242_wait_status(lp, RC_STATUS_PHY_RDY, RC_STATUS_MASK, __LINE__);
adf7242_clear_irqstat(lp);
return adf7242_cmd(lp, CMD_RC_RX);
}
static int adf7242_set_txpower(struct ieee802154_hw *hw, int mbm)
{
struct adf7242_local *lp = hw->priv;
@ -666,7 +682,7 @@ static int adf7242_start(struct ieee802154_hw *hw)
struct adf7242_local *lp = hw->priv;
adf7242_cmd(lp, CMD_RC_PHY_RDY);
adf7242_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
adf7242_clear_irqstat(lp);
enable_irq(lp->spi->irq);
set_bit(FLAG_START, &lp->flags);
@ -677,10 +693,10 @@ static void adf7242_stop(struct ieee802154_hw *hw)
{
struct adf7242_local *lp = hw->priv;
disable_irq(lp->spi->irq);
adf7242_cmd(lp, CMD_RC_IDLE);
clear_bit(FLAG_START, &lp->flags);
disable_irq(lp->spi->irq);
adf7242_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
adf7242_clear_irqstat(lp);
}
static int adf7242_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
@ -795,9 +811,12 @@ static int adf7242_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
struct adf7242_local *lp = hw->priv;
int ret;
/* ensure existing instances of the IRQ handler have completed */
disable_irq(lp->spi->irq);
set_bit(FLAG_XMIT, &lp->flags);
reinit_completion(&lp->tx_complete);
adf7242_cmd(lp, CMD_RC_PHY_RDY);
adf7242_clear_irqstat(lp);
ret = adf7242_write_fbuf(lp, skb->data, skb->len);
if (ret)
@ -806,6 +825,7 @@ static int adf7242_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
ret = adf7242_cmd(lp, CMD_RC_CSMACA);
if (ret)
goto err;
enable_irq(lp->spi->irq);
ret = wait_for_completion_interruptible_timeout(&lp->tx_complete,
HZ / 10);
@ -828,7 +848,7 @@ static int adf7242_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
err:
clear_bit(FLAG_XMIT, &lp->flags);
adf7242_cmd(lp, CMD_RC_RX);
adf7242_cmd_rx(lp);
return ret;
}
@ -852,7 +872,7 @@ static int adf7242_rx(struct adf7242_local *lp)
skb = dev_alloc_skb(len);
if (!skb) {
adf7242_cmd(lp, CMD_RC_RX);
adf7242_cmd_rx(lp);
return -ENOMEM;
}
@ -860,14 +880,14 @@ static int adf7242_rx(struct adf7242_local *lp)
ret = adf7242_read_fbuf(lp, data, len, true);
if (ret < 0) {
kfree_skb(skb);
adf7242_cmd(lp, CMD_RC_RX);
adf7242_cmd_rx(lp);
return ret;
}
lqi = data[len - 2];
lp->rssi = data[len - 1];
adf7242_cmd(lp, CMD_RC_RX);
ret = adf7242_cmd_rx(lp);
skb_trim(skb, len - 2); /* Don't put RSSI/LQI or CRC into the frame */
@ -876,7 +896,7 @@ static int adf7242_rx(struct adf7242_local *lp)
dev_dbg(&lp->spi->dev, "%s: ret=%d len=%d lqi=%d rssi=%d\n",
__func__, ret, (int)len, (int)lqi, lp->rssi);
return 0;
return ret;
}
static const struct ieee802154_ops adf7242_ops = {
@ -932,10 +952,7 @@ static irqreturn_t adf7242_isr(int irq, void *data)
unsigned int xmit;
u8 irq1;
adf7242_wait_status(lp, RC_STATUS_PHY_RDY, RC_STATUS_MASK, __LINE__);
adf7242_read_reg(lp, REG_IRQ1_SRC1, &irq1);
adf7242_write_reg(lp, REG_IRQ1_SRC1, irq1);
if (!(irq1 & (IRQ_RX_PKT_RCVD | IRQ_CSMA_CA)))
dev_err(&lp->spi->dev, "%s :ERROR IRQ1 = 0x%X\n",
@ -946,6 +963,9 @@ static irqreturn_t adf7242_isr(int irq, void *data)
xmit = test_bit(FLAG_XMIT, &lp->flags);
if (xmit && (irq1 & IRQ_CSMA_CA)) {
adf7242_wait_status(lp, RC_STATUS_PHY_RDY,
RC_STATUS_MASK, __LINE__);
if (ADF7242_REPORT_CSMA_CA_STAT) {
u8 astat;
@ -966,6 +986,7 @@ static irqreturn_t adf7242_isr(int irq, void *data)
lp->tx_stat = SUCCESS;
}
complete(&lp->tx_complete);
adf7242_clear_irqstat(lp);
} else if (!xmit && (irq1 & IRQ_RX_PKT_RCVD) &&
(irq1 & IRQ_FRAME_VALID)) {
adf7242_rx(lp);
@ -974,16 +995,19 @@ static irqreturn_t adf7242_isr(int irq, void *data)
dev_dbg(&lp->spi->dev, "%s:%d : ERROR IRQ1 = 0x%X\n",
__func__, __LINE__, irq1);
adf7242_cmd(lp, CMD_RC_PHY_RDY);
adf7242_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
adf7242_cmd(lp, CMD_RC_RX);
adf7242_cmd_rx(lp);
} else {
/* This can only be xmit without IRQ, likely a RX packet.
* we get an TX IRQ shortly - do nothing or let the xmit
* timeout handle this
*/
dev_dbg(&lp->spi->dev, "%s:%d : ERROR IRQ1 = 0x%X, xmit %d\n",
__func__, __LINE__, irq1, xmit);
adf7242_wait_status(lp, RC_STATUS_PHY_RDY,
RC_STATUS_MASK, __LINE__);
complete(&lp->tx_complete);
adf7242_clear_irqstat(lp);
}
return IRQ_HANDLED;
@ -1003,7 +1027,7 @@ static int adf7242_soft_reset(struct adf7242_local *lp, int line)
adf7242_set_promiscuous_mode(lp->hw, lp->promiscuous);
adf7242_set_csma_params(lp->hw, lp->min_be, lp->max_be,
lp->max_cca_retries);
adf7242_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
adf7242_clear_irqstat(lp);
if (test_bit(FLAG_START, &lp->flags)) {
enable_irq(lp->spi->irq);
@ -1069,7 +1093,7 @@ static int adf7242_hw_init(struct adf7242_local *lp)
adf7242_write_reg(lp, REG_IRQ1_EN0, 0);
adf7242_write_reg(lp, REG_IRQ1_EN1, IRQ_RX_PKT_RCVD | IRQ_CSMA_CA);
adf7242_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
adf7242_clear_irqstat(lp);
adf7242_write_reg(lp, REG_IRQ1_SRC0, 0xFF);
adf7242_cmd(lp, CMD_RC_IDLE);