@all users of saa7146-based cards
(drivers: dvb-ttpci, budget, budget-ci, budget-av)
Please test whether the attached patch has any negative effects.
Two fixes for the 'saa7146_wait_for_debi_done' code:
(a) Timeout did not work when the routine was called with interrupts
disabled.
(b) Reduce PCI I/O load caused by saa7146_wait_for_debi_done.
Seems to be very important on fast machines!
Based on a patch posted by [EMAIL PROTECTED]
If nobody complains I will commit this patch next week.
CU
Oliver
--
----------------------------------------------------------------
VDR Remote Plugin 0.4.0: http://www.escape-edv.de/endriss/vdr/
----------------------------------------------------------------
diff -r 54b01562b12d linux/drivers/media/common/saa7146_core.c
--- a/linux/drivers/media/common/saa7146_core.c Tue Oct 09 22:58:39 2007 +0200
+++ b/linux/drivers/media/common/saa7146_core.c Tue Oct 09 23:54:20 2007 +0200
@@ -59,41 +59,85 @@ void saa7146_setgpio(struct saa7146_dev
}
/* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
-int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
-{
- unsigned long start;
+static inline int saa7146_wait_for_debi_done_sleep(struct saa7146_dev *dev,
+ unsigned long us1, unsigned long us2)
+{
+ unsigned long timeout;
int err;
/* wait for registers to be programmed */
- start = jiffies;
+ timeout = jiffies + usecs_to_jiffies(us1);
while (1) {
- err = time_after(jiffies, start + HZ/20);
+ err = time_after(jiffies, timeout);
if (saa7146_read(dev, MC2) & 2)
break;
if (err) {
- DEB_S(("timed out while waiting for registers getting programmed\n"));
+ printk(KERN_ERR "%s: %s timed out while waiting for registers getting programmed\n",
+ dev->name, __FUNCTION__);
return -ETIMEDOUT;
}
- if (nobusyloop)
- msleep(1);
+ msleep(1);
}
/* wait for transfer to complete */
- start = jiffies;
+ timeout = jiffies + usecs_to_jiffies(us2);
while (1) {
- err = time_after(jiffies, start + HZ/4);
+ err = time_after(jiffies, timeout);
if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
break;
saa7146_read(dev, MC2);
if (err) {
- DEB_S(("timed out while waiting for transfer completion\n"));
+ printk(KERN_ERR "%s: %s timed out while waiting for transfer completion\n",
+ dev->name, __FUNCTION__);
return -ETIMEDOUT;
}
- if (nobusyloop)
- msleep(1);
+ msleep(1);
}
return 0;
+}
+
+static inline int saa7146_wait_for_debi_done_busyloop(struct saa7146_dev *dev,
+ unsigned long us1, unsigned long us2)
+{
+ unsigned long loops;
+
+ /* wait for registers to be programmed */
+ loops = us1;
+ while (1) {
+ if (saa7146_read(dev, MC2) & 2)
+ break;
+ if (!loops--) {
+ printk(KERN_ERR "%s: %s timed out while waiting for registers getting programmed\n",
+ dev->name, __FUNCTION__);
+ return -ETIMEDOUT;
+ }
+ udelay(1);
+ }
+
+ /* wait for transfer to complete */
+ loops = us2 / 5;
+ while (1) {
+ if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
+ break;
+ saa7146_read(dev, MC2);
+ if (!loops--) {
+ printk(KERN_ERR "%s: %s timed out while waiting for transfer completion\n",
+ dev->name, __FUNCTION__);
+ return -ETIMEDOUT;
+ }
+ udelay(5);
+ }
+
+ return 0;
+}
+
+int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
+{
+ if (nobusyloop)
+ return saa7146_wait_for_debi_done_sleep(dev, 50000, 250000);
+ else
+ return saa7146_wait_for_debi_done_busyloop(dev, 50000, 250000);
}
/****************************************************************************
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