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>

1 files changed, 16 insertions, 5 deletions

diff --git a/drivers/media/common/saa7146_i2c.c b/drivers/media/common/saa7146_i2c.c
index f823286341e..7e7689afae6 100644
--- a/drivers/media/common/saa7146_i2c.c
+++ b/drivers/media/common/saa7146_i2c.c
@@ -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"));
                 }