From 4d8451700171d6bbc254191880f86bfdeec2f74f Mon Sep 17 00:00:00 2001 From: "holger@muscate-magnussen.de" Date: Tue, 1 May 2007 09:25:56 -0300 Subject: 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 Signed-off-by: Andreas Oberritter Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/pluto2/pluto2.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/media/dvb/pluto2/pluto2.c') 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); -- cgit v1.2.3