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Commit 1b5f69f5 authored by Brad Love's avatar Brad Love Committed by Mauro Carvalho Chehab
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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: default avatarBrad Love <brad@nextdimension.cc>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 0eeb232f

drivers/media/usb/em28xx/em28xx-core.c

+13 −0
Original line number Diff line number Diff line
@@ -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,