Commit 4d845170 authored May 01, 2007 by holger@muscate-magnussen.de Committed by Mauro Carvalho Chehab May 09, 2007

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>

parent ba70d59b

drivers/media/dvb/pluto2/pluto2.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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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