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OpenCloudOS-Kernel
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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>
This commit is contained in:
Oliver Endriss 2007-08-09 02:41:16 -03:00 committed by Mauro Carvalho Chehab
parent c471b331dd
commit 276e49a01a
2 changed files with 28 additions and 22 deletions
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31
drivers/media/common/saa7146_core.c
View File

@ -248,10 +248,11 @@ int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt
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 @@ static irqreturn_t interrupt_hw(int irq, void *dev_id)
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 @@ static irqreturn_t interrupt_hw(int irq, void *dev_id)
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 @@ static irqreturn_t interrupt_hw(int irq, void *dev_id)
ERR(("disabling interrupt source(s)!\n"));
SAA7146_IER_DISABLE(dev,isr);
}
saa7146_write(dev, ISR, ack_isr);
return IRQ_HANDLED;
}

19
drivers/media/common/saa7146_i2c.c
View File

@ -202,7 +202,8 @@ static int saa7146_i2c_writeout(struct saa7146_dev *dev, u32* dword, int short_d
/* 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 @@ static int saa7146_i2c_writeout(struct saa7146_dev *dev, u32* dword, int short_d
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 @@ static int saa7146_i2c_writeout(struct saa7146_dev *dev, u32* dword, int short_d
/* 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 @@ static int saa7146_i2c_writeout(struct saa7146_dev *dev, u32* dword, int short_d
}
/* 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"));
}