On Thu, Jan 4, 2018 at 7:04 PM, Brad Love <brad@xxxxxxxxxxxxxxxx> wrote:
> Set appropriate bulk/ISOC transfer multiplier on capture start.
> This sets ISOC transfer to 940 bytes (188 * 5)
> This sets bulk transfer to 48128 bytes (188 * 256)
>
> The above values are maximum allowed according to Empia.
>
> Signed-off-by: Brad Love <brad@xxxxxxxxxxxxxxxx>
:+1
Reviewed-by: Michael Ira Krufky <mkrufky@xxxxxxxxxxx>
> ---
> drivers/media/usb/em28xx/em28xx-core.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c
> index ef38e56..67ed6a3 100644
> --- a/drivers/media/usb/em28xx/em28xx-core.c
> +++ b/drivers/media/usb/em28xx/em28xx-core.c
> @@ -638,6 +638,18 @@ 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 {
> + /* TS2 Maximum Transfer Size = 188 * 5 */
> + em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
> + EM2874_R5D_TS1_PKT_SIZE :
> + EM2874_R5E_TS2_PKT_SIZE, 0x05);
> + }
> if (dev->ts == PRIMARY_TS)
> rc = em28xx_write_reg_bits(dev,
> EM2874_R5F_TS_ENABLE,
> --
> 2.7.4
>
