diff options
| author | Brad Love | 2018-02-01 23:04:37 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab | 2018-03-06 10:32:13 +0100 |
| commit | 1b5f69f5b94489343d939700a50a0a841a16f97d (patch) | |
| tree | c35abe5231b0d44870e57523262525fbed8a2ed0 | |
| parent | media: em28xx: constify a new function (diff) | |
| download | kernel-qcow2-linux-1b5f69f5b94489343d939700a50a0a841a16f97d.tar.gz kernel-qcow2-linux-1b5f69f5b94489343d939700a50a0a841a16f97d.tar.xz kernel-qcow2-linux-1b5f69f5b94489343d939700a50a0a841a16f97d.zip | |
media: em28xx: Bulk transfer implementation fix
Set appropriate bulk/ISOC transfer multiplier on capture start.
This sets ISOC transfer to USB endpoint configuration
This sets bulk transfer to 48128 bytes (188 * 256)
The bulk multiplier is maximum allowed according to Empia.
Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-core.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c index ef38e567c4bb..903d0b34f557 100644 --- a/drivers/media/usb/em28xx/em28xx-core.c +++ b/drivers/media/usb/em28xx/em28xx-core.c @@ -638,6 +638,19 @@ int em28xx_capture_start(struct em28xx *dev, int start) dev->chip_id == CHIP_ID_EM28174 || dev->chip_id == CHIP_ID_EM28178) { /* The Transport Stream Enable Register moved in em2874 */ + if (dev->dvb_xfer_bulk) { + /* Max Tx Size = 188 * 256 = 48128 - LCM(188,512) * 2 */ + em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ? + EM2874_R5D_TS1_PKT_SIZE : + EM2874_R5E_TS2_PKT_SIZE, + 0xFF); + } else { + /* ISOC Maximum Transfer Size = 188 * 5 */ + em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ? + EM2874_R5D_TS1_PKT_SIZE : + EM2874_R5E_TS2_PKT_SIZE, + dev->dvb_max_pkt_size_isoc / 188); + } if (dev->ts == PRIMARY_TS) rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE, |