From: Brad Love Date: Thu, 1 Feb 2018 22:04:37 +0000 (-0500) Subject: media: em28xx: Bulk transfer implementation fix X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=1b5f69f5b94489343d939700a50a0a841a16f97d;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Mauro Carvalho Chehab --- 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,