Em Fri, 26 Jan 2018 17:37:39 -0200 Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx> escreveu: > Em Fri, 26 Jan 2018 12:17:37 -0200 > Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx> escreveu: > > > Hi Alan, > > > > Em Mon, 8 Jan 2018 14:15:35 -0500 (EST) > > Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> escreveu: > > > > > On Mon, 8 Jan 2018, Linus Torvalds wrote: > > > > > > > Can somebody tell which softirq it is that dvb/usb cares about? > > > > > > I don't know about the DVB part. The USB part is a little difficult to > > > analyze, mostly because the bug reports I've seen are mostly from > > > people running non-vanilla kernels. > > > > I suspect that the main reason for people not using non-vanilla Kernels > > is that, among other bugs, the dwc2 upstream driver has serious troubles > > handling ISOCH traffic. > > > > Using Kernel 4.15-rc7 from this git tree: > > https://git.linuxtv.org/mchehab/experimental.git/log/?h=softirq_fixup > > > > (e. g. with the softirq bug partially reverted with Linux patch, and > > the DWC2 deferred probe fixed) > > > > With a PCTV 461e device, with uses em28xx driver + Montage frontend > > (with is the same used on dvbsky hardware - except for em28xx). > > > > This device doesn't support bulk for DVB, just ISOCH. The drivers work > > fine on x86. > > > > Using a test signal at the bit rate of 56698,4 Kbits/s, that's what > > happens, when capturing less than one second of data: > > > > $ dvbv5-zap -c ~/dvb_channel.conf "tv brasil" -l universal -X 100 -m -t2dvbv5-zap -c ~/dvb_channel.conf "tv brasil" -l universal -X 100 -m -t2 > > Using LNBf UNIVERSAL > > Universal, Europe > > Freqs : 10800 to 11800 MHz, LO: 9750 MHz > > Freqs : 11600 to 12700 MHz, LO: 10600 MHz > > using demux 'dvb0.demux0' > > reading channels from file '/home/mchehab/dvb_channel.conf' > > tuning to 11468000 Hz > > (0x00) Signal= -33.90dBm > > Lock (0x1f) Signal= -33.90dBm C/N= 30.28dB postBER= 2.33x10^-6 > > dvb_dev_set_bufsize: buffer set to 6160384 > > dvb_set_pesfilter to 0x2000 > > 354.08s: Starting capture > > 354.73s: only read 59220 bytes > > 354.73s: Stopping capture > > > > [ 354.000827] dwc2 3f980000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x84, ep->hcpriv=116f41b2 > > [ 354.000859] dwc2 3f980000.usb: DWC OTG HCD EP RESET: bEndpointAddress=0x84 > > [ 354.010744] dwc2 3f980000.usb: --Host Channel 5 Interrupt: Frame Overrun-- > > ... (hundreds of thousands of Frame Overrun messages) > > [ 354.660857] dwc2 3f980000.usb: --Host Channel 5 Interrupt: Frame Overrun-- > > [ 354.660935] dwc2 3f980000.usb: DWC OTG HCD URB Dequeue > > [ 354.660959] dwc2 3f980000.usb: Called usb_hcd_giveback_urb() > > [ 354.660966] dwc2 3f980000.usb: urb->status = 0 > > [ 354.660992] dwc2 3f980000.usb: DWC OTG HCD URB Dequeue > > [ 354.661001] dwc2 3f980000.usb: Called usb_hcd_giveback_urb() > > [ 354.661008] dwc2 3f980000.usb: urb->status = 0 > > [ 354.661054] dwc2 3f980000.usb: DWC OTG HCD URB Dequeue > > [ 354.661065] dwc2 3f980000.usb: Called usb_hcd_giveback_urb() > > [ 354.661072] dwc2 3f980000.usb: urb->status = 0 > > [ 354.661107] dwc2 3f980000.usb: DWC OTG HCD URB Dequeue > > [ 354.661120] dwc2 3f980000.usb: Called usb_hcd_giveback_urb() > > [ 354.661127] dwc2 3f980000.usb: urb->status = 0 > > [ 354.661146] dwc2 3f980000.usb: DWC OTG HCD URB Dequeue > > [ 354.661158] dwc2 3f980000.usb: Called usb_hcd_giveback_urb() > > [ 354.661165] dwc2 3f980000.usb: urb->status = 0 > > Btw, > > Just in case, I also applied all recent pending dwc2 patches I found at > linux-usb (even trivial unrelated ones) at: > > https://git.linuxtv.org/mchehab/experimental.git/log/?h=dwc2_patches > > No differences. ISOCH is still broken. > > If anyone wants to see the full logs, it is there: > https://pastebin.com/XJYyTwPv Someone pointed me in priv that applying a change at DWC2 BRCM profile to enable uframe_sched might help. So, I wrote this patch: https://git.linuxtv.org/mchehab/experimental.git/commit/?h=v4.15%2bmedia%2bdwc2&id=19abf0026b7bf1bd44aa9d2add9f958935760ded And applied on the top of this branch: https://git.linuxtv.org/mchehab/experimental.git/log/?h=v4.15%2bmedia%2bdwc2 It is based on Kernel 4.15 vanilla. I applied: - all media -next patches that will be sent to Kernel 4.16-rc1; - DWC2 patches submitted by Gregor at linux-usb ML; - Linus softirq test patch: https://git.linuxtv.org/mchehab/experimental.git/commit/?h=v4.15%2bmedia%2bdwc2&id=ccf833fd4a5b99c3d3cf2c09c065670f74a230a7 - A DT patch that enables VCIQ (needed by some GPU drivers): https://git.linuxtv.org/mchehab/experimental.git/commit/?h=v4.15%2bmedia%2bdwc2&id=fd4e9ca6f41d35b6234c30fa29937141e0c09570 - a few debug patches like this one: https://git.linuxtv.org/mchehab/experimental.git/commit/?h=v4.15%2bmedia%2bdwc2&id=f50669c18394f5b5674630e2ebf78a06b023626f I didn't notice any difference. The dwc2 driver is still broken for ISOCH transfers: https://pastebin.com/nL1Fe9X5 Cheers, Mauro
