Hi, Bin Liu <b-liu@xxxxxx> writes: > Felipe, > > On 10/14/2015 11:25 AM, Felipe Balbi wrote: >> >> Hi, >> >> Bin Liu <b-liu@xxxxxx> writes: >>> On 10/14/2015 10:56 AM, Felipe Balbi wrote: >>>> >>>> Hi, >>>> >>>> Bin Liu <b-liu@xxxxxx> writes: >>>>> Hi, >>>>> >>>>> On 10/13/2015 01:22 PM, Felipe Balbi wrote: >>>>>> Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx> writes: >>>>>>> On Mon, Oct 12, 2015 at 11:34 AM, Yegor Yefremov >>>>>>> <yegorslists@xxxxxxxxxxxxxx> wrote: >>>>>>>> We have a problem, when using more than 12 FTDI ports. Kernels tried: >>>>>>>> 3.18.1, 4.2.3 and 4.3-rc5. SoC am335x 600MHz >>>>>>>> >>>>>>>> Below the USB topology: >>>>>>>> >>>>>>>> # lsusb -t >>>>>>>> /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M >>>>>>>> /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M >>>>>>>> |__ Port 1: Dev 2, If 0, Class=, Driver=hub/4p, 480M >>>>>>>> |__ Port 1: Dev 9, If 0, Class=, Driver=hub/4p, 480M >>>>>>>> |__ Port 1: Dev 10, If 0, Class=, Driver=ftdi_sio, 12M >>>>>>>> |__ Port 2: Dev 11, If 0, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 2: Dev 11, If 1, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 2: Dev 11, If 2, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 2: Dev 11, If 3, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 3: Dev 12, If 0, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 3: Dev 12, If 1, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 3: Dev 12, If 2, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 3: Dev 12, If 3, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 2: Dev 4, If 0, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 2: Dev 4, If 1, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 2: Dev 4, If 2, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 2: Dev 4, If 3, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 3: Dev 7, If 0, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 3: Dev 7, If 1, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 3: Dev 7, If 2, Class=, Driver=ftdi_sio, 480M >>>>>>>> |__ Port 3: Dev 7, If 3, Class=, Driver=ftdi_sio, 480M >>>>> >>>>> How many EPs does each FTDI device require? at least one INT EP, right? >>>>> If I read it right, the topology above has 2 hubs, and 16 high-speed >>>>> FTDI and 1 full-speed FTDI. So it requires at least 18 high-speed INT >>>>> EPs. MUSB driver only has 11 high-speed EPs for mode-4 which is the EP >>>>> configuration used by default. I am wondering how those devices got >>>>> enumerated properly. >>>> >>>> dynamic EP allocation, but that has its own limitations. >>>> >>> MUSB does not support dynamic EP allocation for INT/ISOCH. >> >> I remember isoc doesn't, not sure about int. Do you remember where that >> part of the code is off the top of your head ? >> > > The MUSB EP allocation is in musb_schedule() in musb_host.c. > > It does not have specific policy for INT/ISOCH, but the issue is that > for periodic EP, it got allocated during device enumeration but freed > only when the device is disconnected. So practically there is no dynamic > EP allocation for INT/ISOCH. This is not exactly what I can see when trying things out: minicom.cap:56:[ 90.909917] musb-hdrc musb-hdrc.1.auto: qh df62d240 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:66:[ 91.175860] musb-hdrc musb-hdrc.1.auto: qh df62d240 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:100:[ 91.697827] musb-hdrc musb-hdrc.1.auto: qh df62d240 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:106:[ 91.818066] musb-hdrc musb-hdrc.1.auto: qh dc4eb340 urb df5b7e40 dev4 ep1in-intr, hw_ep 11, df5c3400/1 minicom.cap:149:[ 92.475792] musb-hdrc musb-hdrc.1.auto: qh df62d240 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:162:[ 92.736808] musb-hdrc musb-hdrc.1.auto: qh dc07d5c0 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:207:[ 93.703046] musb-hdrc musb-hdrc.1.auto: qh df551cc0 urb df65ee40 dev7 ep1in-intr, hw_ep 12, df6a2bc0/1 minicom.cap:215:[ 93.977574] musb-hdrc musb-hdrc.1.auto: qh df551cc0 urb df65ee40 dev7 ep1in-intr, hw_ep 12, df6a2bc0/1 minicom.cap:240:[ 94.388472] musb-hdrc musb-hdrc.1.auto: qh dc4eb340 urb df5b7e40 dev4 ep1in-intr, hw_ep 11, df5c3400/1 minicom.cap:289:[ 95.422325] musb-hdrc musb-hdrc.1.auto: qh dc4eb340 urb df5b7e40 dev4 ep1in-intr, hw_ep 11, df5c3400/1 minicom.cap:305:[ 95.688207] musb-hdrc musb-hdrc.1.auto: qh dc4eb340 urb df5b7e40 dev4 ep1in-intr, hw_ep 11, df5c3400/1 minicom.cap:335:[ 96.291453] musb-hdrc musb-hdrc.1.auto: qh df551cc0 urb df65ee40 dev7 ep1in-intr, hw_ep 12, df6a2bc0/1 minicom.cap:410:[ 97.696976] musb-hdrc musb-hdrc.1.auto: qh df6b70c0 urb dc011f40 dev11 ep1in-intr, hw_ep 2, dd842080/8 minicom.cap:56:[ 90.909917] musb-hdrc musb-hdrc.1.auto: qh df62d240 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:66:[ 91.175860] musb-hdrc musb-hdrc.1.auto: qh df62d240 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:100:[ 91.697827] musb-hdrc musb-hdrc.1.auto: qh df62d240 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:106:[ 91.818066] musb-hdrc musb-hdrc.1.auto: qh dc4eb340 urb df5b7e40 dev4 ep1in-intr, hw_ep 11, df5c3400/1 minicom.cap:149:[ 92.475792] musb-hdrc musb-hdrc.1.auto: qh df62d240 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:162:[ 92.736808] musb-hdrc musb-hdrc.1.auto: qh dc07d5c0 urb dc4ebec0 dev3 ep1in-intr, hw_ep 10, df700680/1 minicom.cap:207:[ 93.703046] musb-hdrc musb-hdrc.1.auto: qh df551cc0 urb df65ee40 dev7 ep1in-intr, hw_ep 12, df6a2bc0/1 minicom.cap:215:[ 93.977574] musb-hdrc musb-hdrc.1.auto: qh df551cc0 urb df65ee40 dev7 ep1in-intr, hw_ep 12, df6a2bc0/1 minicom.cap:240:[ 94.388472] musb-hdrc musb-hdrc.1.auto: qh dc4eb340 urb df5b7e40 dev4 ep1in-intr, hw_ep 11, df5c3400/1 minicom.cap:289:[ 95.422325] musb-hdrc musb-hdrc.1.auto: qh dc4eb340 urb df5b7e40 dev4 ep1in-intr, hw_ep 11, df5c3400/1 minicom.cap:305:[ 95.688207] musb-hdrc musb-hdrc.1.auto: qh dc4eb340 urb df5b7e40 dev4 ep1in-intr, hw_ep 11, df5c3400/1 minicom.cap:335:[ 96.291453] musb-hdrc musb-hdrc.1.auto: qh df551cc0 urb df65ee40 dev7 ep1in-intr, hw_ep 12, df6a2bc0/1 minicom.cap:410:[ 97.696976] musb-hdrc musb-hdrc.1.auto: qh df6b70c0 urb dc011f40 dev11 ep1in-intr, hw_ep 2, dd842080/8 Note how the same ep1in-intr was used with different devices and different hw_eps. OTOH, within the same device, hw_ep was constant. Hmmm... -- balbi
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