4.18-stable review patch. If anyone has any objections, please let me know.
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From: Brad Love brad@nextdimension.cc
[ Upstream commit a7853c257a3ea0907467a1750ff45de4d9ba1915 ]
Addresses the following, which introduced a regression itself:
Commit 509f89652f83 ("media: em28xx: fix a regression with HVR-950")
The regression fix breaks dual transport stream support. Currently, when a tuner starts streaming it sets alt mode on the USB interface. The problem is, in a dual tuner model, both tuners share the same USB interface, so when the second tuner becomes active and sets alt mode on the interface it kills streaming on the other port.
This patch addresses the regression by only setting alt mode on the USB interface during em28xx_start_streaming, if the device is not a dual tuner model. This allows all older and single tuner devices to explicitly set alt mode during stream startup. Testers report both isoc and bulk DualHD models work correctly with the alt mode set only once, in em28xx_dvb_init.
Fixes: 509f89652f83 ("media: em28xx: fix a regression with HVR-950") Signed-off-by: Brad Love brad@nextdimension.cc Signed-off-by: Michael Ira Krufky mkrufky@gmail.com Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/usb/em28xx/em28xx-dvb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/media/usb/em28xx/em28xx-dvb.c +++ b/drivers/media/usb/em28xx/em28xx-dvb.c @@ -218,7 +218,9 @@ static int em28xx_start_streaming(struct dvb_alt = dev->dvb_alt_isoc; }
- usb_set_interface(udev, dev->ifnum, dvb_alt); + if (!dev->board.has_dual_ts) + usb_set_interface(udev, dev->ifnum, dvb_alt); + rc = em28xx_set_mode(dev, EM28XX_DIGITAL_MODE); if (rc < 0) return rc;