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Subject: media: em28xx: Bulk transfer implementation fix
Author: Brad Love <b...@nextdimension.cc>
Date: Thu Feb 1 17:04:37 2018 -0500
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 <b...@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
drivers/media/usb/em28xx/em28xx-core.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
---
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,
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