From 43f2cccfc81c0af719a425ea816ce8003bb09748 Mon Sep 17 00:00:00 2001 From: Devin Heitmueller Date: Mon, 6 Aug 2012 22:46:53 -0300 Subject: [PATCH] [media] au8522: properly recover from the au8522 delivering misaligned TS streams There is an apparent bug in the au8522 TS clocking which can result in it delivering a TS payload to the au0828 that is shifted by some number of bits. For example, the device will announce a packet containing "FA 38 FF F8" which if you shift left one bit is "1F 47 1F FF F0..." This presents itself as no TS stream being delivered from the kernel to userland, since the kernel demux will drop every packet. In the event that this condition occurs, restart the DVB stream. Also, this patch includes a couple of lines of cleanup to not change the FIFO configuration while the FIFO is running (which can screw up the state machine), and dequeue the buffers before turning off the FIFO. This puts the logic in sync with the Windows driver. Signed-off-by: Devin Heitmueller Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/au0828/au0828-dvb.c | 54 ++++++++++++++++++++++--- drivers/media/video/au0828/au0828.h | 1 + 2 files changed, 49 insertions(+), 6 deletions(-) diff --git a/drivers/media/video/au0828/au0828-dvb.c b/drivers/media/video/au0828/au0828-dvb.c index 39ece8e24985..b328f6550d0b 100644 --- a/drivers/media/video/au0828/au0828-dvb.c +++ b/drivers/media/video/au0828/au0828-dvb.c @@ -101,11 +101,14 @@ static struct tda18271_config hauppauge_woodbury_tunerconfig = { .gate = TDA18271_GATE_DIGITAL, }; +static void au0828_restart_dvb_streaming(struct work_struct *work); + /*-------------------------------------------------------------------*/ static void urb_completion(struct urb *purb) { struct au0828_dev *dev = purb->context; int ptype = usb_pipetype(purb->pipe); + unsigned char *ptr; dprintk(2, "%s()\n", __func__); @@ -121,6 +124,16 @@ static void urb_completion(struct urb *purb) return; } + /* See if the stream is corrupted (to work around a hardware + bug where the stream gets misaligned */ + ptr = purb->transfer_buffer; + if (purb->actual_length > 0 && ptr[0] != 0x47) { + dprintk(1, "Need to restart streaming %02x len=%d!\n", + ptr[0], purb->actual_length); + schedule_work(&dev->restart_streaming); + return; + } + /* Feed the transport payload into the kernel demux */ dvb_dmx_swfilter_packets(&dev->dvb.demux, purb->transfer_buffer, purb->actual_length / 188); @@ -138,14 +151,13 @@ static int stop_urb_transfer(struct au0828_dev *dev) dprintk(2, "%s()\n", __func__); + dev->urb_streaming = 0; for (i = 0; i < URB_COUNT; i++) { usb_kill_urb(dev->urbs[i]); kfree(dev->urbs[i]->transfer_buffer); usb_free_urb(dev->urbs[i]); } - dev->urb_streaming = 0; - return 0; } @@ -246,11 +258,8 @@ static int au0828_dvb_stop_feed(struct dvb_demux_feed *feed) mutex_lock(&dvb->lock); if (--dvb->feeding == 0) { /* Stop transport */ - au0828_write(dev, 0x608, 0x00); - au0828_write(dev, 0x609, 0x00); - au0828_write(dev, 0x60a, 0x00); - au0828_write(dev, 0x60b, 0x00); ret = stop_urb_transfer(dev); + au0828_write(dev, 0x60b, 0x00); } mutex_unlock(&dvb->lock); } @@ -258,6 +267,37 @@ static int au0828_dvb_stop_feed(struct dvb_demux_feed *feed) return ret; } +static void au0828_restart_dvb_streaming(struct work_struct *work) +{ + struct au0828_dev *dev = container_of(work, struct au0828_dev, + restart_streaming); + struct au0828_dvb *dvb = &dev->dvb; + int ret; + + if (dev->urb_streaming == 0) + return; + + dprintk(1, "Restarting streaming...!\n"); + + mutex_lock(&dvb->lock); + + /* Stop transport */ + ret = stop_urb_transfer(dev); + au0828_write(dev, 0x608, 0x00); + au0828_write(dev, 0x609, 0x00); + au0828_write(dev, 0x60a, 0x00); + au0828_write(dev, 0x60b, 0x00); + + /* Start transport */ + au0828_write(dev, 0x608, 0x90); + au0828_write(dev, 0x609, 0x72); + au0828_write(dev, 0x60a, 0x71); + au0828_write(dev, 0x60b, 0x01); + ret = start_urb_transfer(dev); + + mutex_unlock(&dvb->lock); +} + static int dvb_register(struct au0828_dev *dev) { struct au0828_dvb *dvb = &dev->dvb; @@ -265,6 +305,8 @@ static int dvb_register(struct au0828_dev *dev) dprintk(1, "%s()\n", __func__); + INIT_WORK(&dev->restart_streaming, au0828_restart_dvb_streaming); + /* register adapter */ result = dvb_register_adapter(&dvb->adapter, DRIVER_NAME, THIS_MODULE, &dev->usbdev->dev, adapter_nr); diff --git a/drivers/media/video/au0828/au0828.h b/drivers/media/video/au0828/au0828.h index 9cde35321824..61cd63e2bc63 100644 --- a/drivers/media/video/au0828/au0828.h +++ b/drivers/media/video/au0828/au0828.h @@ -197,6 +197,7 @@ struct au0828_dev { /* Digital */ struct au0828_dvb dvb; + struct work_struct restart_streaming; /* Analog */ struct v4l2_device v4l2_dev; -- 2.30.2