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| author | holger@muscate-magnussen.de <holger@muscate-magnussen.de> | 2007-05-01 09:25:56 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-05-09 10:12:35 -0300 |
| commit | 4d8451700171d6bbc254191880f86bfdeec2f74f (patch) | |
| tree | 4b08ddedcb6717f189668e66e6f35e496ae318ff | |
| parent | ba70d59bb987110c4394e896b299f9726609aa33 (diff) | |
| download | linux-4d8451700171d6bbc254191880f86bfdeec2f74f.tar.gz linux-4d8451700171d6bbc254191880f86bfdeec2f74f.tar.bz2 linux-4d8451700171d6bbc254191880f86bfdeec2f74f.zip | |
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 <holger@muscate-magnussen.de>
Signed-off-by: Andreas Oberritter <obi@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
| -rw-r--r-- | 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 058df5c10034..08a2599ed74a 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); |