On Thu, 2015-05-21 at 11:08 +0200, Krzysztof Opasiak wrote:
> On 05/21/2015 10:39 AM, Bastien Nocera wrote:
> > On Thu, 2015-05-21 at 10:09 +0200, Krzysztof Opasiak wrote:
> > > Could you specify exactly the model?
> >
> > Onda v975w
> >
> > > If android is running fine on it you may check android kernel
> > > config
> > > for
> > > this device and check which udc is enabled.
> >
> > No kernel sources from this Chinese vendor. But it looks like the
> > USB_DWC3 config is the one to enable.
> >
>
> I see that this tablet is running windows by default so just flash
> it
> with stock image and check what device manager says about udc;)
The Baytrail UDC driver is supposed to be a DWC3 PCI device, but it
doesn't show up in lspci at all. Given that I managed to make an NFC
chip show up that I didn't know was in the machine, I guess it's
possibly hidden in the firmware somewhere.
> > In the meantime, shouldn't the ffs-test and adbd have failed with
> > ENOTSUPP instead of EBUSY if no hardware support was available?
> >
>
> As far as I understand the code it should fail with -ENODEV and
> debug
> message:
>
> pr_debug("couldn't find an available UDC\n");
I get that stack trace when writing is attempted:
[ 122.362269] ------------[ cut here ]------------
[ 122.362287] WARNING: CPU: 2 PID: 2384 at drivers/usb/gadget/function/f_fs.c:3417 ffs_ep0_write+0x730/0x810 [usb_f_fs]()
[ 122.362292] Modules linked in: g_ffs usb_f_fs libcomposite udc_core bnep bluetooth fuse hid_logitech_hidpp uvcvideo videobuf2_vmalloc snd_usb_audio videobuf2_core videobuf2_memops v4l2_common snd_usbmidi_lib videodev snd_hwdep snd_rawmidi media hid_multitouch hid_logitech_dj nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw vfat pn544_mei fat mei_phy pn544 intel_rapl hci intel_soc_dts_thermal coretemp nfc gpio_keys snd_soc_sst_baytrail_pcm
[ 122.362412] kvm_intel iTCO_wdt snd_soc_sst_ipc iTCO_vendor_support snd_soc_sst_dsp kvm snd_soc_sst_byt_rt5640_mach crc32_pclmul crc32c_intel snd_intel_sst_acpi snd_intel_sst_core snd_soc_sst_mfld_platform snd_soc_rt5640 snd_soc_rl6231 snd_soc_core snd_compress snd_pcm_dmaengine tpm_crb snd_seq tpm dw_dmac int3402_thermal dw_dmac_core snd_seq_device int3400_thermal kxcjk_1013 soc_button_array snd_pcm processor_thermal_device int3403_thermal acpi_thermal_rel int340x_thermal_zone mei_txe industrialio_triggered_buffer goodix mei snd_timer lpc_ich ac i2c_hid kfifo_buf acpi_pad dell_smo8800 iosf_mbi industrialio snd soundcore pwm_lpss_platform rfkill_gpio battery regmap_i2c pwm_lpss i2c_designware_platform rfkill snd_soc_sst_acpi i2c_designware_core nfsd auth_rpcgss nfs_acl lockd grace sunrpc dm9601 usbnet
[ 122.362529] mii i915 mmc_block i2c_algo_bit drm_kms_helper drm video sdhci_acpi sdhci mmc_core
[ 122.362555] CPU: 2 PID: 2384 Comm: adbd Tainted: G W 4.1.0-0.rc4.git0.1.1.fc22.i686 #1
[ 122.362561] Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 07/25/2014
[ 122.362567] c0d1f947 415badfa 00000000 d1029e64 c0a86e54 00000000 d1029e94 c045b937
[ 122.362584] c0c37f94 00000002 00000950 f9b313d4 00000d59 f9b2ebf0 f9b2ebf0 fffffff0
[ 122.362600] 00000003 deb53d00 d1029ea4 c045ba42 00000009 00000000 d1029f08 f9b2ebf0
[ 122.362617] Call Trace:
[ 122.362633] [<c0a86e54>] dump_stack+0x41/0x52
[ 122.362645] [<c045b937>] warn_slowpath_common+0x87/0xc0
[ 122.362658] [<f9b2ebf0>] ? ffs_ep0_write+0x730/0x810 [usb_f_fs]
[ 122.362668] [<f9b2ebf0>] ? ffs_ep0_write+0x730/0x810 [usb_f_fs]
[ 122.362678] [<c045ba42>] warn_slowpath_null+0x22/0x30
[ 122.362689] [<f9b2ebf0>] ffs_ep0_write+0x730/0x810 [usb_f_fs]
[ 122.362702] [<f9b2e4c0>] ? ffs_ep0_read+0x380/0x380 [usb_f_fs]
[ 122.362712] [<c05a1c1f>] __vfs_write+0x2f/0x100
[ 122.362722] [<c05a42f2>] ? __sb_start_write+0x52/0x110
[ 122.362731] [<c05a2534>] vfs_write+0x94/0x1b0
[ 122.362740] [<c0a8a1c0>] ? mutex_lock+0x10/0x30
[ 122.362749] [<c05a2f41>] SyS_write+0x51/0xb0
[ 122.362759] [<c0a8c71f>] sysenter_do_call+0x12/0x12
[ 122.362766] ---[ end trace 0673d3467cecf8db ]---
> Have you tried loading other gadget modules?
No, I didn't try.
> If not, maybe try to load
> g_ether and check what dmesg says.
I didn't have g_ether built, so tried with g_serial:
# modprobe g_serial
modprobe: ERROR: could not insert 'g_serial': No such device
Cheers
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