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V4L/DVB (12823): tm6000: Uses another method for handling incomplete packets
This requires a little more memory, and some memcpy to work, but the logic is simpler than the previous method. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
29c389be1c
commit
6eb5c8a6c8
@ -77,7 +77,6 @@
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* Define TV Master TM5600/TM6000 URB message codes and length
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*/
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#define TM6000_URB_MSG_LEN 180
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enum {
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TM6000_URB_MSG_VIDEO=1,
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TM6000_URB_MSG_AUDIO,
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@ -19,6 +19,8 @@
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#include <linux/videodev2.h>
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#define TM6000_URB_MSG_LEN 180
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struct usb_isoc_ctl {
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/* max packet size of isoc transaction */
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int max_pkt_size;
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@ -32,16 +34,16 @@ struct usb_isoc_ctl {
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/* transfer buffers for isoc transfer */
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char **transfer_buffer;
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/* Last buffer command and region */
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u8 cmd;
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int pos, size, pktsize;
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/* Last buffer control */
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int pending;
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int pos;
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/* Last field: ODD or EVEN? */
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int field;
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/* Stores incomplete commands */
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u32 tmp_buf;
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int tmp_buf_len;
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u8 tbuf[TM6000_URB_MSG_LEN+4];
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size_t len;
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/* Stores already requested buffers */
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struct tm6000_buffer *buf;
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@ -215,93 +215,84 @@ static int copy_packet (struct urb *urb, u32 header, u8 **ptr, u8 *endp,
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*/
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unsigned int linewidth=(*buf)->vb.width<<1;
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c=(header>>24) & 0xff;
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if (!dev->isoc_ctl.cmd) {
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c=(header>>24) & 0xff;
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/* split the header fields */
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size = (((header & 0x7e)<<1) -1) *4;
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block = (header>>7) & 0xf;
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field = (header>>11) & 0x1;
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line = (header>>12) & 0x1ff;
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cmd = (header>>21) & 0x7;
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/* split the header fields */
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size = (((header & 0x7e)<<1) -1) *4;
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block = (header>>7) & 0xf;
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field = (header>>11) & 0x1;
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line = (header>>12) & 0x1ff;
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cmd = (header>>21) & 0x7;
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/* Validates header fields */
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if(size>TM6000_URB_MSG_LEN)
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size = TM6000_URB_MSG_LEN;
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/* Validates header fields */
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if(size>TM6000_URB_MSG_LEN)
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size = TM6000_URB_MSG_LEN;
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if (cmd == TM6000_URB_MSG_VIDEO) {
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if ((block+1)*TM6000_URB_MSG_LEN>linewidth)
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cmd = TM6000_URB_MSG_ERR;
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if (cmd == TM6000_URB_MSG_VIDEO) {
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if ((block+1)*TM6000_URB_MSG_LEN>linewidth)
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cmd = TM6000_URB_MSG_ERR;
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/* FIXME: Mounts the image as field0+field1
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* It should, instead, check if the user selected
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* entrelaced or non-entrelaced mode
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*/
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pos= ((line<<1)+field)*linewidth +
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block*TM6000_URB_MSG_LEN;
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/* FIXME: Mounts the image as field0+field1
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* It should, instead, check if the user selected
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* entrelaced or non-entrelaced mode
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*/
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pos= ((line<<1)+field)*linewidth +
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block*TM6000_URB_MSG_LEN;
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/* Don't allow to write out of the buffer */
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if (pos+TM6000_URB_MSG_LEN > (*buf)->vb.size) {
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dprintk(dev, V4L2_DEBUG_ISOC,
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"ERR: size=%d, num=%d, line=%d, "
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"field=%d\n",
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size, block, line, field);
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cmd = TM6000_URB_MSG_ERR;
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}
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} else {
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pos=0;
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}
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/* Prints debug info */
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dprintk(dev, V4L2_DEBUG_ISOC, "size=%d, num=%d, "
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" line=%d, field=%d\n",
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/* Don't allow to write out of the buffer */
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if (pos+TM6000_URB_MSG_LEN > (*buf)->vb.size) {
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dprintk(dev, V4L2_DEBUG_ISOC,
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"ERR: size=%d, num=%d, line=%d, "
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"field=%d\n",
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size, block, line, field);
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if ((last_line!=line)&&(last_line+1!=line) &&
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(cmd != TM6000_URB_MSG_ERR) ) {
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if (cmd != TM6000_URB_MSG_VIDEO) {
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dprintk(dev, V4L2_DEBUG_ISOC, "cmd=%d, "
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"size=%d, num=%d, line=%d, field=%d\n",
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cmd, size, block, line, field);
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}
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if (start_line<0)
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start_line=last_line;
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/* Prints debug info */
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dprintk(dev, V4L2_DEBUG_ISOC, "lines= %d-%d, "
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"field=%d\n",
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start_line, last_line, field);
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if ((start_line<6 && last_line>200) &&
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(last_field != field) ) {
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dev->isoc_ctl.nfields++;
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if (dev->isoc_ctl.nfields>=2) {
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dev->isoc_ctl.nfields=0;
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/* Announces that a new buffer were filled */
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buffer_filled (dev, dma_q, *buf);
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dprintk(dev, V4L2_DEBUG_ISOC,
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"new buffer filled\n");
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rc=get_next_buf (dma_q, buf);
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}
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}
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start_line=line;
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last_field=field;
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cmd = TM6000_URB_MSG_ERR;
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}
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last_line=line;
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pktsize = TM6000_URB_MSG_LEN;
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} else {
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/* Continue the last copy */
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cmd = dev->isoc_ctl.cmd;
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size= dev->isoc_ctl.size;
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pos = dev->isoc_ctl.pos;
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pktsize = dev->isoc_ctl.pktsize;
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pos=0;
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}
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/* Prints debug info */
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dprintk(dev, V4L2_DEBUG_ISOC, "size=%d, num=%d, "
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" line=%d, field=%d\n",
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size, block, line, field);
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if ((last_line!=line)&&(last_line+1!=line) &&
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(cmd != TM6000_URB_MSG_ERR) ) {
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if (cmd != TM6000_URB_MSG_VIDEO) {
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dprintk(dev, V4L2_DEBUG_ISOC, "cmd=%d, "
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"size=%d, num=%d, line=%d, field=%d\n",
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cmd, size, block, line, field);
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}
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if (start_line<0)
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start_line=last_line;
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/* Prints debug info */
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dprintk(dev, V4L2_DEBUG_ISOC, "lines= %d-%d, "
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"field=%d\n",
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start_line, last_line, field);
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if ((start_line<6 && last_line>200) &&
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(last_field != field) ) {
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dev->isoc_ctl.nfields++;
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if (dev->isoc_ctl.nfields>=2) {
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dev->isoc_ctl.nfields=0;
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/* Announces that a new buffer were filled */
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buffer_filled (dev, dma_q, *buf);
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dprintk(dev, V4L2_DEBUG_ISOC,
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"new buffer filled\n");
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rc=get_next_buf (dma_q, buf);
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}
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}
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start_line=line;
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last_field=field;
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}
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last_line=line;
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pktsize = TM6000_URB_MSG_LEN;
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cpysize=(endp-(*ptr)>size)?size:endp-(*ptr);
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if (cpysize) {
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@ -325,19 +316,7 @@ printk ("%ld: cmd=%s, size=%d\n", jiffies,
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tm6000_msg_type[cmd],size);
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}
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}
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if (cpysize<size) {
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/* End of URB packet, but cmd processing is not
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* complete. Preserve the state for a next packet
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*/
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dev->isoc_ctl.pos = pos+cpysize;
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dev->isoc_ctl.size= size-cpysize;
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dev->isoc_ctl.cmd = cmd;
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dev->isoc_ctl.pktsize = pktsize-cpysize;
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(*ptr)+=cpysize;
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} else {
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dev->isoc_ctl.cmd = 0;
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(*ptr)+=pktsize;
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}
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(*ptr)+=cpysize;
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return rc;
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}
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@ -347,57 +326,73 @@ static int copy_streams(u8 *data, u8 *out_p, unsigned long len,
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{
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struct tm6000_dmaqueue *dma_q = urb->context;
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struct tm6000_core *dev= container_of(dma_q,struct tm6000_core,vidq);
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u8 *ptr=data, *endp=data+len;
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u8 *ptr, *endp;
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unsigned long header=0;
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int rc=0;
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int rc=0, size;
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for (ptr=data; ptr<endp;) {
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if (!dev->isoc_ctl.cmd) {
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u8 *p=(u8 *)&dev->isoc_ctl.tmp_buf;
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/* FIXME: This seems very complex
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* It just recovers up to 3 bytes of the header that
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* might be at the previous packet
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*/
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if (dev->isoc_ctl.tmp_buf_len) {
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while (dev->isoc_ctl.tmp_buf_len) {
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if ( *(ptr+3-dev->isoc_ctl.tmp_buf_len) == 0x47) {
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break;
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}
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p++;
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dev->isoc_ctl.tmp_buf_len--;
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}
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if (dev->isoc_ctl.tmp_buf_len) {
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memcpy (&header,p,
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dev->isoc_ctl.tmp_buf_len);
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memcpy (((u8 *)header)+
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dev->isoc_ctl.tmp_buf,
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ptr,
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4-dev->isoc_ctl.tmp_buf_len);
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ptr+=4-dev->isoc_ctl.tmp_buf_len;
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goto HEADER;
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}
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}
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/* Process pending data */
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if (dev->isoc_ctl.pending) {
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memcpy(dev->isoc_ctl.tbuf + dev->isoc_ctl.len, ptr,
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sizeof(dev->isoc_ctl.tbuf) - dev->isoc_ctl.len);
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/* Seek for sync */
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endp = dev->isoc_ctl.tbuf + sizeof(dev->isoc_ctl.tbuf);
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for (ptr = dev->isoc_ctl.tbuf;ptr < endp - 3;ptr++) {
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if (*(ptr + 3) == 0x47)
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break;
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}
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header=*(unsigned long *)ptr;
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size = (((header & 0x7e) << 1) - 1) * 4;
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if(size > TM6000_URB_MSG_LEN)
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size = TM6000_URB_MSG_LEN;
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if (ptr+3+size >= endp) {
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printk(KERN_ERR "tm6000: broken data\n");
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ptr = data;
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goto process_new_uri;
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}
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ptr+=4;
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/* Copy or continue last copy */
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rc=copy_packet(urb, header, &ptr, endp, out_p, buf);
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if (rc<0) {
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buf=NULL;
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printk(KERN_ERR "tm6000: buffer underrun at %ld\n",
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jiffies);
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return rc;
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}
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dev->isoc_ctl.pending = 0;
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ptr = data + (ptr - dev->isoc_ctl.tbuf);
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} else
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ptr = data;
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process_new_uri:
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endp = data + len;
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while (ptr<endp) {
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if (!dev->isoc_ctl.pending) {
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/* Seek for sync */
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for (;ptr<endp-3;ptr++) {
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if (*(ptr+3)==0x47)
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break;
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}
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header=*(unsigned long *)ptr;
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size = (((header & 0x7e)<<1) -1) *4;
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if(size>TM6000_URB_MSG_LEN)
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size = TM6000_URB_MSG_LEN;
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if (ptr+3>=endp) {
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dev->isoc_ctl.tmp_buf_len=endp-ptr;
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memcpy (&dev->isoc_ctl.tmp_buf,ptr,
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dev->isoc_ctl.tmp_buf_len);
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dev->isoc_ctl.cmd=0;
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if (ptr+3+size >= endp) {
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int len = endp - ptr;
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memcpy (dev->isoc_ctl.tbuf, ptr, len);
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dev->isoc_ctl.len = len;
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dev->isoc_ctl.pending = 1;
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return rc;
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}
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/* Get message header */
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header=*(unsigned long *)ptr;
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ptr+=4;
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}
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HEADER:
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/* Copy or continue last copy */
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rc=copy_packet(urb,header,&ptr,endp,out_p,buf);
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rc=copy_packet(urb, header, &ptr, endp, out_p, buf);
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if (rc<0) {
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buf=NULL;
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printk(KERN_ERR "tm6000: buffer underrun at %ld\n",
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