Message-id: <58498d36-e4e1-61fc-9a11-488582972ead@samsung.com>
Date:	Mon, 02 May 2016 07:50:20 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	Hans Verkuil <hverkuil@...all.nl>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Kukjin Kim <kgene@...nel.org>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-usb@...r.kernel.org,
	linux.amoon@...il.com, tjakobi@...h.uni-bielefeld.de,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP
 booting

Hi Hans,


On 2016-05-01 18:01, Hans Verkuil wrote:
> On 05/01/2016 04:09 PM, Hans Verkuil wrote:
>> On 05/01/2016 03:17 PM, Krzysztof Kozlowski wrote:
>>> On Sat, Apr 30, 2016 at 11:43:44AM +0200, Hans Verkuil wrote:
>>>> Hi Krzysztof,
>>>>
>>>> On 04/29/2016 12:59 PM, Krzysztof Kozlowski wrote:
>>>>> Hi,
>>>>>
>>>>> Patches are independent, please pick up as you wish.
>>>>>
>>>>> However all of them are needed to solve the issue, so I am sending
>>>>> everything together for easier testng.
>>>>>
>>>>>
>>>>> Problem
>>>>> =======
>>>>> When Odroid U3 (usb3503 + smsc95xx + max77686) boots from network (TFTP),
>>>>> the usb3503 does not show up in "lsusb". Hard-reset is required, e.g.
>>>>> by suspend to RAM. The actual TFTP boot does not have to happen. Just
>>>>> "usb start" from U-Boot is sufficient.
>>>>>
>>>>>
>>>>> Solution
>>>>> ========
>>>>> Perform real hardware reset (including regulator off/on) when probing.
>>>>>
>>>>>
>>>>> Tested on Odroid U3 so far. Please kindly test on X2 and other
>>>>> configurations and bootloaders.
>>>> Against which kernel git repo is this patch?
>>>>
>>>> I did apply this patch series first:
>>>>
>>>> http://www.spinics.net/lists/arm-kernel/msg500764.html
>>> Indeed it is based on above patchset... and on linux-next. It touches
>>> multiple trees so next seems the easiest base.
>>>
>>>> followed by this patch series.
>>>>
>>>> I've tested with both 4.6.0-rc2 and -rc5, but in all cases (even without
>>>> applying these patches!) the boot sequence hangs here:
>>>>
>>>> ...
>>>> [drm] Exynos DRM: using 12c10000.mixer device for DMA mapping operations
>>>> exynos-drm exynos-drm: bound 12c10000.mixer (ops mixer_component_ops)
>>>> exynos-drm exynos-drm: bound 12d00000.hdmi (ops hdmi_component_ops)
>>>> [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
>>>> [drm] No driver support for vblank timestamp query.
>>>> Console: switching to colour frame buffer device 240x67
>>>> exynos-drm exynos-drm: fb0:  frame buffer device
>>>> [drm] Initialized exynos 1.0.0 20110530 on minor 0
>>>> brd: module loaded
>>>> loop: module loaded
>>>> s3c64xx-spi 13930000.spi: spi bus clock parent not specified, using clock
>>>> at index 0 as parent
>>>> s3c64xx-spi 13930000.spi: number of chip select lines not specified,
>>>> assuming 1 chip select line
>>>> tun: Universal TUN/TAP device driver, 1.6
>>>> tun: (C) 1999-2004 Max Krasnyansky <maxk@...lcomm.com>
>>>> usbcore: registered new interface driver asix
>>>> usbcore: registered new interface driver ax88179_178a
>>>> usbcore: registered new interface driver cdc_ether
>>>> usbcore: registered new interface driver smsc95xx
>>>> usbcore: registered new interface driver cdc_ncm
>>>> dwc2 12480000.hsotg: Specified GNPTXFDEP=1024 > 768
>>>> dwc2 12480000.hsotg: EPs: 16, dedicated fifos, 7808 entries in SPRAM
>>>> ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>>>> ehci-exynos: EHCI EXYNOS driver
>>>> exynos-ehci 12580000.ehci: EHCI Host Controller
>>>> exynos-ehci 12580000.ehci: new USB bus registered, assigned bus number 1
>>>> exynos-ehci 12580000.ehci: irq 51, io mem 0x12580000
>>>> exynos-ehci 12580000.ehci: USB 2.0 started, EHCI 1.00
>>>> usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
>>>> usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
>>>> usb usb1: Product: EHCI Host Controller
>>>> usb usb1: Manufacturer: Linux 4.6.0-rc5-odroid ehci_hcd
>>>> usb usb1: SerialNumber: 12580000.ehci
>>>> hub 1-0:1.0: USB hub found
>>>> hub 1-0:1.0: 3 ports detected
>>>> ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
>>>> ohci-exynos: OHCI EXYNOS driver
>>>> usbcore: registered new interface driver usb-storage
>>>> usb3503 0-0008: switched to HUB mode
>>>> usb3503 0-0008: usb3503_probe: probed in hub mode
>>>> using random self ethernet address
>>>> using random host ethernet address
>>>> usb0: HOST MAC 66:79:ef:11:72:85
>>>> usb0: MAC 1e:66:f2:66:8e:2a
>>>> using random self ethernet address
>>>> using random host ethernet address
>>>> g_ether gadget: Ethernet Gadget, version: Memorial Day 2008
>>>> g_ether gadget: g_ether ready
>>>> dwc2 12480000.hsotg: bound driver g_ether
>>>> mousedev: PS/2 mouse device common for all mice
>>>> max77686-rtc max77686-rtc: rtc core: registered max77686-rtc as rtc0
>>>> i2c /dev entries driver
>>>> s5p-fimc-md camera: Entity type for entity FIMC.0 was not initialized!
>>>> usb 1-2: new high-speed USB device number 2 using exynos-ehci
>>>> usb 1-2: New USB device found, idVendor=0424, idProduct=9730
>>>> usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
>>>> smsc95xx v1.0.4
>>>> smsc95xx 1-2:1.0 eth0: register 'smsc95xx' at usb-12580000.ehci-2, smsc95xx
>>>> USB 2.0 Ethernet, c2:22:09:f2:5f:e8
>>>> usb 1-3: new high-speed USB device number 3 using exynos-ehci
>>>> usb 1-3: New USB device found, idVendor=0424, idProduct=3503
>>>> usb 1-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
>>>> hub 1-3:1.0: USB hub found
>>>> hub 1-3:1.0: 3 ports detected
>>>>
>>>> No oops, no nothing. It's just sitting there.
>>> Apparently you have encountered different issue. sysrq with 'l' might be
>>> useful.
>>>
>>>> Is this a regression that was introduced in 4.6? Or is there some special
>>>> new config that needs to be turned on first in 4.6?
>>> I think it was like that for looong time... although I did not use
>>> netboot before on that target.
>> Sorry, I meant the hanging issue I got in 4.6, not the ethernet issue.
>> I get the same problem with linux-next. Can you mail me the .config you are using?
> Never mind.
>
>> After some more testing I don't think it is hanging, instead it seems that the mmc
>> isn't enabled/found and so it just sits waiting for the root partition to appear.
> That was fun. There are two problems that both caused the boot to end at the same
> place: first of all the root partition is now called mmcblk1p1 instead of mmcblk0p1
> in 4.6, so it was just waiting for the root partition to appear. Nothing to do with
> your patch series, just unexpected.

This is known "issue", it has been reported several times. This is 
caused by some
changes in mmc core. The best workaround is to use PARTUUID instead of 
hardcoding
root device path.

>
> The second is that enabling CONFIG_VIDEO_S5P_FIMC causes the boot to hang at that
> same place. I suspect there is a deadlock somewhere. I'm digging deeper into that
> but again, unrelated to your patch series.

I've posted a fix a few days ago: https://patchwork.linuxtv.org/patch/34117/
A change to media device core causes deadlock on driver registration.

> Anyway, after disabling that config option I was finally able to test your patch
> series:
>
> Tested-by: Hans Verkuil <hans.verkuil@...co.com>

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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