V4L/DVB (5987): saa7146: clean-up irq processing
Interrupt processing fixed: First handle interrupt, then acknowledge it.
Otherwise the same interrupt might occur twice.
Cleaned-up i2c interrupt handler and i2c error messages.
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/common/saa7146_core.c b/drivers/media/common/saa7146_core.c
index 12cda9e..1c962a2 100644
--- a/drivers/media/common/saa7146_core.c
+++ b/drivers/media/common/saa7146_core.c
@@ -248,10 +248,11 @@
static irqreturn_t interrupt_hw(int irq, void *dev_id)
{
struct saa7146_dev *dev = dev_id;
- u32 isr = 0;
+ u32 isr;
+ u32 ack_isr;
/* read out the interrupt status register */
- isr = saa7146_read(dev, ISR);
+ ack_isr = isr = saa7146_read(dev, ISR);
/* is this our interrupt? */
if ( 0 == isr ) {
@@ -259,8 +260,6 @@
return IRQ_NONE;
}
- saa7146_write(dev, ISR, isr);
-
if( 0 != (dev->ext)) {
if( 0 != (dev->ext->irq_mask & isr )) {
if( 0 != dev->ext->irq_func ) {
@@ -283,21 +282,16 @@
isr &= ~MASK_28;
}
if (0 != (isr & (MASK_16|MASK_17))) {
- u32 status = saa7146_read(dev, I2C_STATUS);
- if( (0x3 == (status & 0x3)) || (0 == (status & 0x1)) ) {
- SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
- /* only wake up if we expect something */
- if( 0 != dev->i2c_op ) {
- u32 psr = (saa7146_read(dev, PSR) >> 16) & 0x2;
- u32 ssr = (saa7146_read(dev, SSR) >> 17) & 0x1f;
- DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status,psr,ssr));
- dev->i2c_op = 0;
- wake_up(&dev->i2c_wq);
- } else {
- DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
- }
+ SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
+ /* only wake up if we expect something */
+ if (0 != dev->i2c_op) {
+ dev->i2c_op = 0;
+ wake_up(&dev->i2c_wq);
} else {
- DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
+ u32 psr = saa7146_read(dev, PSR);
+ u32 ssr = saa7146_read(dev, SSR);
+ printk(KERN_WARNING "%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
+ dev->name, isr, psr, ssr);
}
isr &= ~(MASK_16|MASK_17);
}
@@ -306,6 +300,7 @@
ERR(("disabling interrupt source(s)!\n"));
SAA7146_IER_DISABLE(dev,isr);
}
+ saa7146_write(dev, ISR, ack_isr);
return IRQ_HANDLED;
}
diff --git a/drivers/media/common/saa7146_i2c.c b/drivers/media/common/saa7146_i2c.c
index f823286..7e7689a 100644
--- a/drivers/media/common/saa7146_i2c.c
+++ b/drivers/media/common/saa7146_i2c.c
@@ -202,7 +202,8 @@
/* a signal arrived */
return -ERESTARTSYS;
- printk(KERN_WARNING "saa7146_i2c_writeout: timed out waiting for end of xfer\n");
+ printk(KERN_WARNING "%s %s [irq]: timed out waiting for end of xfer\n",
+ dev->name, __FUNCTION__);
return -EIO;
}
status = saa7146_read(dev, I2C_STATUS);
@@ -219,7 +220,8 @@
break;
}
if (time_after(jiffies,timeout)) {
- printk(KERN_WARNING "saa7146_i2c_writeout: timed out waiting for MC2\n");
+ printk(KERN_WARNING "%s %s: timed out waiting for MC2\n",
+ dev->name, __FUNCTION__);
return -EIO;
}
}
@@ -235,7 +237,8 @@
/* this is normal when probing the bus
* (no answer from nonexisistant device...)
*/
- DEB_I2C(("saa7146_i2c_writeout: timed out waiting for end of xfer\n"));
+ printk(KERN_WARNING "%s %s [poll]: timed out waiting for end of xfer\n",
+ dev->name, __FUNCTION__);
return -EIO;
}
if (++trial < 50 && short_delay)
@@ -246,8 +249,16 @@
}
/* give a detailed status report */
- if ( 0 != (status & SAA7146_I2C_ERR)) {
+ if ( 0 != (status & (SAA7146_I2C_SPERR | SAA7146_I2C_APERR |
+ SAA7146_I2C_DTERR | SAA7146_I2C_DRERR |
+ SAA7146_I2C_AL | SAA7146_I2C_ERR |
+ SAA7146_I2C_BUSY)) ) {
+ if ( 0 == (status & SAA7146_I2C_ERR) ||
+ 0 == (status & SAA7146_I2C_BUSY) ) {
+ /* it may take some time until ERR goes high - ignore */
+ DEB_I2C(("unexpected i2c status %04x\n", status));
+ }
if( 0 != (status & SAA7146_I2C_SPERR) ) {
DEB_I2C(("error due to invalid start/stop condition.\n"));
}