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i2c: omap: switch to threaded IRQ support 

for OMAP2, we can easily switch over to threaded
IRQs on the I2C driver. This will allow us to
spend less time in hardirq context.

Signed-off-by: Felipe Balbi <balbi@ti.com>
[Trivial formating changes]
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 16:28:13 +05:30 committed by Wolfram Sang
parent d741d0c792
commit 3b2f8f82da
1 changed files with 37 additions and 6 deletions
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43
drivers/i2c/busses/i2c-omap.c
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@ -176,6 +176,7 @@ enum {
#define I2C_OMAP_ERRATA_I462 (1 << 1)
struct omap_i2c_dev {
spinlock_t lock; /* IRQ synchronization */
struct device *dev;
void __iomem *base; /* virtual */
int irq;
@ -854,9 +855,30 @@ static int omap_i2c_transmit_data(struct omap_i2c_dev *dev, u8 num_bytes,
}
static irqreturn_t
omap_i2c_isr(int this_irq, void *dev_id)
omap_i2c_isr(int irq, void *dev_id)
{
struct omap_i2c_dev *dev = dev_id;
irqreturn_t ret = IRQ_HANDLED;
u16 mask;
u16 stat;
spin_lock(&dev->lock);
mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
if (stat & mask)
ret = IRQ_WAKE_THREAD;
spin_unlock(&dev->lock);
return ret;
}
static irqreturn_t
omap_i2c_isr_thread(int this_irq, void *dev_id)
{
struct omap_i2c_dev *dev = dev_id;
unsigned long flags;
u16 bits;
u16 stat;
int err = 0, count = 0;
@ -864,6 +886,7 @@ omap_i2c_isr(int this_irq, void *dev_id)
if (pm_runtime_suspended(dev->dev))
return IRQ_NONE;
spin_lock_irqsave(&dev->lock, flags);
do {
bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
@ -877,6 +900,7 @@ omap_i2c_isr(int this_irq, void *dev_id)
if (!stat) {
/* my work here is done */
spin_unlock_irqrestore(&dev->lock, flags);
return IRQ_HANDLED;
}
@ -985,6 +1009,8 @@ omap_i2c_isr(int this_irq, void *dev_id)
out:
omap_i2c_complete_cmd(dev, err);
spin_unlock_irqrestore(&dev->lock, flags);
return IRQ_HANDLED;
}
@ -1028,7 +1054,6 @@ omap_i2c_probe(struct platform_device *pdev)
struct omap_i2c_bus_platform_data *pdata = pdev->dev.platform_data;
struct device_node *node = pdev->dev.of_node;
const struct of_device_id *match;
irq_handler_t isr;
int irq;
int r;
@ -1078,6 +1103,8 @@ omap_i2c_probe(struct platform_device *pdev)
dev->dev = &pdev->dev;
dev->irq = irq;
spin_lock_init(&dev->lock);
platform_set_drvdata(pdev, dev);
init_completion(&dev->cmd_complete);
@ -1130,10 +1157,14 @@ omap_i2c_probe(struct platform_device *pdev)
/* reset ASAP, clearing any IRQs */
omap_i2c_init(dev);
isr = (dev->rev < OMAP_I2C_OMAP1_REV_2) ? omap_i2c_omap1_isr :
omap_i2c_isr;
r = devm_request_irq(&pdev->dev, dev->irq, isr, IRQF_NO_SUSPEND,
pdev->name, dev);
if (dev->rev < OMAP_I2C_OMAP1_REV_2)
r = devm_request_irq(&pdev->dev, dev->irq, omap_i2c_omap1_isr,
IRQF_NO_SUSPEND, pdev->name, dev);
else
r = devm_request_threaded_irq(&pdev->dev, dev->irq,
omap_i2c_isr, omap_i2c_isr_thread,
IRQF_NO_SUSPEND | IRQF_ONESHOT,
pdev->name, dev);
if (r) {
dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);