Dear friends, It's my first time to post, please feel free to correct me if any concern. I have one ARM board with linux version (Linux localhost 2.6.27-default #3 PREEMPT Thu Dec 10 15:17:44 CST 2009 armv6l unknown), and the usb device controller used for mass storage. it's normal if without sleep/wakeup procedure, however, if the procedure happen and the host is Linux Ubuntu OS, the device can't be enumerated, it's ok with the host as Window XP since USB_REQ_CLEAR_FEATURE will be sent to the device. after adding some debug info in the file_storage.c, and I found there are several raise_exception() called, but no corresponding handle_exception() when comparing the plug/unplug usb cable procedure, so the fsg->state not reset properly. it' ok if commenting the "if (fsg->state <= new_state) " in function raise_exception(). but I think it may be not the formal way. cat /proc/usb/bus/devices T: Bus=07 Lev=01 Prnt=01 Port=05 Cnt=01 Dev#= 9 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=0525 ProdID=a4a5 Rev= 3.22 S: Manufacturer=Linux 2.6.27-default with SiRFSOC USB S: Product=File-backed Storage Gadget S: SerialNumber=372041756775 C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 2mA 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=01(O) Atr=02(Bulk) MxPS= 512 Ivl=125us the log as following: (note: "if (fsg->state <= new_state)" already commented) ===============Sleep================================= # [ 735.164747] request_suspend_state: sleep (0->3) at 1321055604000 (1970-01-02 03:04:26.055598000 UTC) [ 740.234255] PM: Syncing filesystems ... done. [ 740.235889] suspend: exit suspend (1970-01-02 03:04:31.126765000 UTC) [ 741.265118] Freezing user space processes ... (elapsed 0.00 seconds) done. [ 741.270366] Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done. [ 741.277406] Suspending console(s) (use no_console_suspend to debug) [ 741.286285] SPI: sirfsoc_spi.1 suspened [ 741.286308] SPI: sirfsoc_spi.0 suspened [ 741.319245] deinit_device_mode [ 741.319263] pcd_change_state: 1 0 [ 741.319276] pcd_flush_and_disable_all_eps [ 741.324102] deinit_device_mode [ 741.324112] pcd_change_state: 2 0 [ 741.324120] pcd_flush_and_disable_all_eps [ 741.324413] fsg_disconnect:disconnect or port reset [ 741.324438] raise_exception BEFORE: fsg state:0,new state 5 [ 741.324461] raise_exception AFTER: fsg state:5 [ 741.329525] PM-pm_s_done: (741329515) [ 0.108994] L2X0 cache controller enabled [ 0.109024] PM-pm_w_initiate: (109021) [ 0.109268] wakeup wake lock: alarm [ 0.353210] usbcd_do_resume [ 0.372122] SIRFSOC-FB: VPP resumed [ 0.402194] SIRFSOC-FB: LCD resumed [ 0.402319] SiRFSoC Backlight: Resumed [ 0.443342] soc-audio soc-audio: scheduling resume work [ 0.443376] soc-audio soc-audio: starting resume work [ 0.514489] soc-audio soc-audio: resume work completed [ 0.532668] pcd_intr_handler: reset interrupt detected [ 0.532702] pcd_flush_and_disable_all_eps [ 0.532718] fsg_disconnect:disconnect or port reset [ 0.532743] raise_exception BEFORE: fsg state:5,new state 5 [ 0.532762] raise_exception AFTER: fsg state:5 [ 0.532778] pcd_start_enumeration [ 0.640820] standard_setup_req:bRequest 6,w_index 0,w_value 256 [ 0.640845] fsg_setup, rc 18 [ 0.641746] ep0_complete: req status 0 [ 0.641793] start_out_status_phase [ 0.647649] pcd_intr_handler: reset interrupt detected [ 0.647660] pcd_flush_and_disable_all_eps [ 0.647672] pcd_core_ep_flush: ep 0 out [ 0.647684] fsg_disconnect:disconnect or port reset [ 0.647706] raise_exception BEFORE: fsg state:5,new state 5 [ 0.647720] raise_exception AFTER: fsg state:5 [ 0.647733] pcd_start_enumeration [ 0.752785] pcd_ep0_process_setup: USB_REQ_SET_ADDRESS [ 0.752803] Dev Addr: 0x5 [ 0.752811] start_in_status_phase [ 0.772862] standard_setup_req:bRequest 6,w_index 0,w_value 256 [ 0.772885] fsg_setup, rc 18 [ 0.773735] ep0_complete: req status 0 [ 0.773779] start_out_status_phase [ 0.774786] standard_setup_req:bRequest 6,w_index 0,w_value 512 [ 0.774817] fsg_setup, rc 32 [ 0.775733] ep0_complete: req status 0 [ 0.775764] start_out_status_phase [ 0.776785] standard_setup_req:bRequest 6,w_index 0,w_value 512 [ 0.776809] fsg_setup, rc 32 [ 0.777733] ep0_complete: req status 0 [ 0.777781] start_out_status_phase [ 0.778784] standard_setup_req:bRequest 6,w_index 0,w_value 768 [ 0.778807] fsg_setup, rc 4 [ 0.779738] ep0_complete: req status 0 [ 0.779771] start_out_status_phase [ 0.780789] standard_setup_req:bRequest 6,w_index 1033,w_value 770 [ 0.780815] fsg_setup, rc 54 [ 0.781734] ep0_complete: req status 0 [ 0.781806] start_out_status_phase [ 0.782786] standard_setup_req:bRequest 6,w_index 1033,w_value 769 [ 0.782811] fsg_setup, rc 76 [ 0.783733] ep0_complete: req status 0 [ 0.783821] start_out_status_phase [ 0.784790] standard_setup_req:bRequest 6,w_index 1033,w_value 771 [ 0.784814] fsg_setup, rc 26 [ 0.785733] ep0_complete: req status 0 [ 0.785779] start_out_status_phase [ 1.237255] standard_setup_req:bRequest 9,w_index 0,w_value 1 [ 1.237269] standard_setup_req :USB_REQ_SET_CONFIGURATION ,bRequestType 0x0,w_value 1 [ 1.237293] raise exception :FSG_STATE_CONFIG_CHANGE [ 1.237305] raise_exception BEFORE: fsg state:5,new state 4 [ 1.237319] raise_exception AFTER: fsg state:4 [ 1.237329] fsg_setup, rc 1255 [ 1.285785] Restarting tasks ... <6>handle_exception:bulk-in-en 1,bulk-out-en 1,intr-in-en 0 [ 1.297951] FIFO Flush for Ep:1 [ 1.304981] FIFO Flush for Ep:1 [ 1.308109] handle_exception:old_state 4,new_config 1 [ 1.313194] handle_exception : FSG_STATE_CONFIG_CHANGE [ 1.318264] do_set_config:new_config 1... [ 1.322316] Disabling ep1in [ 1.325128] Disabling ep1out [ 1.328090] Enabling ep1in, type 2 in MaxSz:512 [ 1.332632] Enabling ep1out, type 2 out MaxSz:512 [ 1.357939] g_file_storage gadget: high speed config #1 it seem that the fsg_main_thread() rescheduled very late by the system. another log is the usb cable unplug/plug procedure for comparison. =========unplug the usb cable =============== [ 411.232492] fsg_disconnect:disconnect or port reset [ 411.237346] raise_exception BEFORE: fsg state:0,new state 5 [ 411.242905] raise_exception AFTER: fsg state:5 [ 411.250708] USB Disconnected [ 411.269895] handle_exception:bulk-in-en 1,bulk-out-en 1,intr-in-en 0 [ 411.273418] pcd_ep_fifo_flush: ep ep1in [ 411.277231] FIFO Flush for Ep:1 [ 411.286680] pcd_ep_fifo_flush: ep ep1out [ 411.287772] FIFO Flush for Ep:1 [ 411.291043] handle_exception:old_state 5,new_config 1 [ 411.295944] handle_exception:FSG_STATE_DISCONNECT [ 411.301060] do_set_config:new_config 0... [ 411.304642] Disabling ep1in [ 411.307479] Disabling ep1out ========= plug the usb cable =============== # [ 482.292614] pcd_intr_handler: reset interrupt detected [ 482.298322] pcd_flush_and_disable_all_eps [ 482.302326] fsg_disconnect:disconnect or port reset [ 482.307191] raise_exception BEFORE: fsg state:0,new state 5 [ 482.312745] raise_exception AFTER: fsg state:5 [ 482.317152] pcd_start_enumeration [ 482.320499] handle_exception:bulk-in-en 0,bulk-out-en 0,intr-in-en 0 [ 482.326786] handle_exception:old_state 5,new_config 1 [ 482.331849] handle_exception:FSG_STATE_DISCONNECT [ 482.336546] do_set_config:new_config 0... [ 482.410051] standard_setup_req:bRequest 6,w_index 0,w_value 256 [ 482.415898] fsg_setup, rc 18 [ 482.418775] ep0_complete: req status 0 [ 482.422536] start_out_status_phase [ 482.442863] fsg_disconnect:disconnect or port reset [ 482.447711] raise_exception BEFORE: fsg state:0,new state 5 [ 482.453295] raise_exception AFTER: fsg state:5 [ 482.457681] pcd_start_enumeration [ 482.461048] handle_exception:bulk-in-en 0,bulk-out-en 0,intr-in-en 0 [ 482.467323] handle_exception:old_state 5,new_config 1 [ 482.472375] handle_exception:FSG_STATE_DISCONNECT [ 482.477070] do_set_config:new_config 0... [ 482.536758] pcd_ep0_process_setup: USB_REQ_SET_ADDRESS [ 482.539075] Dev Addr: 0x6 [ 482.541777] start_in_status_phase [ 482.573794] standard_setup_req:bRequest 6,w_index 0,w_value 256 [ 482.579663] fsg_setup, rc 18 [ 482.582539] ep0_complete: req status 0 [ 482.586280] start_out_status_phase [ 482.601474] standard_setup_req:bRequest 6,w_index 0,w_value 512 [ 482.607349] fsg_setup, rc 32 [ 482.610233] ep0_complete: req status 0 [ 482.613966] start_out_status_phase [ 482.629159] standard_setup_req:bRequest 6,w_index 0,w_value 512 [ 482.635043] fsg_setup, rc 32 [ 482.637910] ep0_complete: req status 0 [ 482.641683] start_out_status_phase [ 482.656847] standard_setup_req:bRequest 6,w_index 0,w_value 768 [ 482.662729] fsg_setup, rc 4 [ 482.665509] ep0_complete: req status 0 [ 482.669242] start_out_status_phase [ 482.684699] standard_setup_req:bRequest 6,w_index 1033,w_value 770 [ 482.690846] fsg_setup, rc 54 [ 482.693738] ep0_complete: req status 0 [ 482.697503] start_out_status_phase [ 482.712939] standard_setup_req:bRequest 6,w_index 1033,w_value 769 [ 482.719055] fsg_setup, rc 76 [ 482.721949] ep0_complete: req status 0 [ 482.725743] start_out_status_phase [ 482.741118] standard_setup_req:bRequest 6,w_index 1033,w_value 771 [ 482.747276] fsg_setup, rc 26 [ 482.750142] ep0_complete: req status 0 [ 482.753900] start_out_status_phase [ 482.762873] pcd_ep0_process_setup: USB_REQ_SET_CONFIGURATION [ 482.774380] standard_setup_req:bRequest 9,w_index 0,w_value 1 [ 482.780061] standard_setup_req :USB_REQ_SET_CONFIGURATION ,bRequestType 0x0,w_value 1 [ 482.787883] raise exception :FSG_STATE_CONFIG_CHANGE [ 482.792833] raise_exception BEFORE: fsg state:0,new state 4 [ 482.798389] raise_exception AFTER: fsg state:4 [ 482.802801] fsg_setup, rc 1255 [ 482.805876] handle_exception:bulk-in-en 0,bulk-out-en 0,intr-in-en 0 [ 482.812220] handle_exception:old_state 4,new_config 1 [ 482.817210] handle_exception : FSG_STATE_CONFIG_CHANGE [ 482.822368] do_set_config:new_config 1... [ 482.826352] Enabling ep1in, type 2 in MaxSz:512 [ 482.830864] Enabling ep1out, type 2 out MaxSz:512 [ 482.856196] g_file_storage gadget: high speed config #1 Many thanks. Yuping Luo -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
