Re: USB 2.0 Mass storage device

From: Lukas Hejtmanek (xhejtman_at_mail.muni.cz)
Date: 02/24/05

  • Next message: Alex Deucher: "Marvell 88W8310 and 88E8050 PCI Express support" 
    Date:	Thu, 24 Feb 2005 22:38:53 +0100
To: Greg KH <greg@kroah.com>

    On Thu, Feb 24, 2005 at 01:15:12PM -0800, Greg KH wrote:
    > And if you look at the raw descriptors, which is what is displayed in
    > /proc/bus/usb/devices in human readable form, the device itself tells
    > the computer what speed it supports. The host never tells the device
    > what speed to run at.

    I do not think so.

    This is another device (Card reader) supporting USB 2.0.

    In this case I used only uhci_hcd driver and it reports speed 12.

    T: Bus=04 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 3 Spd=12 MxCh= 0
    D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
    P: Vendor=05dc ProdID=b018 Rev= 1.28
    S: Manufacturer=Lexar Media
    S: Product=Multi-Card Reader
    S: SerialNumber=0000246504
    C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
    I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
    E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
    E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms

    In this case I used both ehci_hcd and uhci_hcd drivers (ehci detected device)
    and it reports speed 480.

    T: Bus=01 Lev=01 Prnt=01 Port=04 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
    D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
    P: Vendor=05dc ProdID=b018 Rev= 1.28
    S: Manufacturer=Lexar Media
    S: Product=Multi-Card Reader
    S: SerialNumber=0000246504
    C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
    I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
    E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
    E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

    So for me it looks like it reports speed according to USB driver or negotiated
    speed. 

    -- 
Lukáš Hejtmánek
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