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[PATCH] dvb: flexcop: fix USB transfer handling 

- driver receives many null TS packets (pid=0x1fff).  They occupy the
  limited USB bandwidth and this leads to loss of video packets.  Enabling the
  null packet filter fixes this.

- packets that flexcop sends to USB have a 2 byte header that has to be
  removed.

- sometimes a TS packet is split between different urbs.  These parts have
  to be combined in a temporary buffer.

Signed-off-by: Vadim Catana <skystar@moldova.cc>
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Johannes Stezenbach 2005-05-16 21:54:12 -07:00 committed by Linus Torvalds
parent 2add87a950
commit 7635acd2d9
3 changed files with 55 additions and 4 deletions
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9
drivers/media/dvb/b2c2/flexcop-hw-filter.c
View File

@ -159,7 +159,7 @@ int flexcop_pid_feed_control(struct flexcop_device *fc, struct dvb_demux_feed *d
} else if (fc->feedcount == onoff && !onoff) {
if (!fc->pid_filtering) {
deb_ts("disabling full TS transfer\n");
flexcop_pid_group_filter(fc, 0x1fe0,0);
flexcop_pid_group_filter(fc, 0, 0x1fe0);
flexcop_pid_group_filter_ctrl(fc,0);
}
@ -175,7 +175,7 @@ int flexcop_pid_feed_control(struct flexcop_device *fc, struct dvb_demux_feed *d
flexcop_pid_group_filter(fc, 0,0);
flexcop_pid_group_filter_ctrl(fc,1);
} else if (fc->pid_filtering && fc->feedcount <= max_pid_filter) {
flexcop_pid_group_filter(fc, 0x1fe0,0);
flexcop_pid_group_filter(fc, 0,0x1fe0);
flexcop_pid_group_filter_ctrl(fc,0);
}
@ -189,10 +189,13 @@ void flexcop_hw_filter_init(struct flexcop_device *fc)
for (i = 0; i < 6 + 32*fc->has_32_hw_pid_filter; i++)
flexcop_pid_control(fc,i,0x1fff,0);
flexcop_pid_group_filter(fc, 0x1fe0,0);
flexcop_pid_group_filter(fc, 0, 0x1fe0);
flexcop_pid_group_filter_ctrl(fc,0);
v = fc->read_ibi_reg(fc,pid_filter_308);
v.pid_filter_308.EMM_filter_4 = 1;
v.pid_filter_308.EMM_filter_6 = 0;
fc->write_ibi_reg(fc,pid_filter_308,v);
flexcop_null_filter_ctrl(fc, 1);
}

47
drivers/media/dvb/b2c2/flexcop-usb.c
View File

@ -282,6 +282,51 @@ static int flexcop_usb_i2c_request(struct flexcop_device *fc, flexcop_access_op_
return flexcop_usb_i2c_req(fc->bus_specific,B2C2_USB_I2C_REQUEST,USB_FUNC_I2C_WRITE,port,chipaddr,addr,buf,len);
}
static void flexcop_usb_process_frame(struct flexcop_usb *fc_usb, u8 *buffer, int buffer_length)
{
u8 *b;
int l;
deb_ts("tmp_buffer_length=%d, buffer_length=%d\n", fc_usb->tmp_buffer_length, buffer_length);
if (fc_usb->tmp_buffer_length > 0) {
memcpy(fc_usb->tmp_buffer+fc_usb->tmp_buffer_length, buffer, buffer_length);
fc_usb->tmp_buffer_length += buffer_length;
b = fc_usb->tmp_buffer;
l = fc_usb->tmp_buffer_length;
} else {
b=buffer;
l=buffer_length;
}
while (l >= 190) {
if (*b == 0xff)
switch (*(b+1) & 0x03) {
case 0x01: /* media packet */
if ( *(b+2) == 0x47 )
flexcop_pass_dmx_packets(fc_usb->fc_dev, b+2, 1);
else
deb_ts("not ts packet %02x %02x %02x %02x \n", *(b+2), *(b+3), *(b+4), *(b+5) );
b += 190;
l -= 190;
break;
default:
deb_ts("wrong packet type\n");
l = 0;
break;
}
else {
deb_ts("wrong header\n");
l = 0;
}
}
if (l>0)
memcpy(fc_usb->tmp_buffer, b, l);
fc_usb->tmp_buffer_length = l;
}
static void flexcop_usb_urb_complete(struct urb *urb, struct pt_regs *ptregs)
{
struct flexcop_usb *fc_usb = urb->context;
@ -297,7 +342,7 @@ static void flexcop_usb_urb_complete(struct urb *urb, struct pt_regs *ptregs)
if (urb->iso_frame_desc[i].actual_length > 0) {
deb_ts("passed %d bytes to the demux\n",urb->iso_frame_desc[i].actual_length);
flexcop_pass_dmx_data(fc_usb->fc_dev,
flexcop_usb_process_frame(fc_usb,
urb->transfer_buffer + urb->iso_frame_desc[i].offset,
urb->iso_frame_desc[i].actual_length);
}

3
drivers/media/dvb/b2c2/flexcop-usb.h
View File

@ -21,6 +21,9 @@ struct flexcop_usb {
struct urb *iso_urb[B2C2_USB_NUM_ISO_URB];
struct flexcop_device *fc_dev;
u8 tmp_buffer[1023+190];
int tmp_buffer_length;
};
#if 0