Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4d8451700171d6bbc254191880f86bfdeec2f74f
Commit: 4d8451700171d6bbc254191880f86bfdeec2f74f
Parent: ba70d59bb987110c4394e896b299f9726609aa33
Author: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
AuthorDate: Tue May 1 09:25:56 2007 -0300
Committer: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
CommitDate: Wed May 9 10:12:35 2007 -0300
V4L/DVB (5578): Workaround for bad hardare/firmware on some pluto2 devices
pluto2_driver: Workaround for pluto2 card reporting wrong number of
received packets and flooding system with interrupts.
This patch constitutes a workaround for a hardware/firmware problem of the
pluto2-based card (e.g., Satelco EasyWatch).
It can happen in rare cases that the card gets into a mode where it
always reports back a number of received packets (nbpackets) which is
larger than the maximum permissible number of packets (TS_DMA_PACKETS).
The workaround that is already in the driver in function pluto_dma_end
reports back zero received packets. In spite of the (in reality) zero
received packets the card continues to generate interrupts at a very
high rate, which can effectively stall the system.
The patch resets the TS logic, which puts the card back into normal
operations.
Signed-off-by: Holger Magnussen <[EMAIL PROTECTED]>
Signed-off-by: Andreas Oberritter <[EMAIL PROTECTED]>
Signed-off-by: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
---
drivers/media/dvb/pluto2/pluto2.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/media/dvb/pluto2/pluto2.c
b/drivers/media/dvb/pluto2/pluto2.c
index 058df5c..08a2599 100644
--- a/drivers/media/dvb/pluto2/pluto2.c
+++ b/drivers/media/dvb/pluto2/pluto2.c
@@ -293,12 +293,20 @@ static void pluto_dma_end(struct pluto *pluto, unsigned
int nbpackets)
* but no packets have been transfered.
* [2] Sometimes (actually very often) NBPACKETS stays at zero
* although one packet has been transfered.
+ * [3] Sometimes (actually rarely), the card gets into an erroneous
+ * mode where it continuously generates interrupts, claiming it
+ * has recieved nbpackets>TS_DMA_PACKETS packets, but no packet
+ * has been transfered. Only a reset seems to solve this
*/
if ((nbpackets == 0) || (nbpackets > TS_DMA_PACKETS)) {
unsigned int i = 0;
while (pluto->dma_buf[i] == 0x47)
i += 188;
nbpackets = i / 188;
+ if (i == 0) {
+ pluto_reset_ts(pluto, 1);
+ dev_printk(KERN_DEBUG, &pluto->pdev->dev, "resetting TS
because of invalid packet counter\n");
+ }
}
dvb_dmx_swfilter_packets(&pluto->demux, pluto->dma_buf, nbpackets);
-
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