[U-Boot] [PATCH 10/16] usb: xhci: Program 'route string' in the input slot context

Wed Jun 28 23:00:25 UTC 2017

Hi Stefan,

On Wed, Jun 28, 2017 at 8:27 PM, Bin Meng <bmeng.cn at gmail.com> wrote:
> Hi Stefan,
>
> On Wed, Jun 28, 2017 at 7:28 PM, Stefan Roese <sr at denx.de> wrote:
>> Hi Bin,
>>
>>
>> On 27.06.2017 10:27, Bin Meng wrote:
>>>
>>> Hi Stefan,
>>>
>>> On Tue, Jun 27, 2017 at 1:23 PM, Stefan Roese <sr at denx.de> wrote:
>>>>
>>>> Hi Bin,
>>>>
>>>>
>>>> On 27.06.2017 02:01, Bin Meng wrote:
>>>>>
>>>>>
>>>>> On Tue, Jun 27, 2017 at 2:07 AM, Marek Vasut <marex at denx.de> wrote:
>>>>>>
>>>>>>
>>>>>> On 06/24/2017 03:57 AM, Bin Meng wrote:
>>>>>>>
>>>>>>>
>>>>>>> Hi Marek,
>>>>>>>
>>>>>>> On Sat, Jun 24, 2017 at 2:02 AM, Marek Vasut <marex at denx.de> wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>> On 06/23/2017 11:54 AM, Bin Meng wrote:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> xHCI spec says: the values of the 'route string' field shall be
>>>>>>>>> initialized by the first 'Address Device' command issued to a
>>>>>>>>> device slot, and shall not be modified by any other command.
>>>>>>>>>
>>>>>>>>> So far U-Boot does not program this field, and it does not prevent
>>>>>>>>> SS device directly attached to root port, or HS device behind an HS
>>>>>>>>> hub, from working, due to the fact that 'route string' is used by
>>>>>>>>> the xHC to target SS packets. But in order to enumerate devices
>>>>>>>>> behind an SS hub, this field must be programmed.
>>>>>>>>>
>>>>>>>>> With this commit and along with previous commits, now SS & HS
>>>>>>>>> devices
>>>>>>>>> attached to a USB 3.0 hub can be enumerated by U-Boot.
>>>>>>>>>
>>>>>>>>> As usual, this new feature is only available when DM is on.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Great, but I really dislike the ifdef pollution, so this needs to be
>>>>>>>> sorted out.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> The ifdef was needed due to it calls DM APIs or access DM udevice. I
>>>>>>> have no intention to add a new feature to the non-DM driver.
>>>>>>
>>>>>>
>>>>>>
>>>>>> But then this creates a massive disparity, it's like we're growing two
>>>>>> USB stacks.
>>>>>>
>>>>>
>>>>> Yep, unfortunately. But if we continue adding new features/fixes to
>>>>> the old non-DM stuff, I am not sure how this can encourage people to
>>>>> switch to DM.
>>>>
>>>>
>>>>
>>>> Correct. We definitely don't want to add new features to non-DM
>>>> drivers / IF, if this is non-trivial.
>>>>
>>>>> Maybe I can check all boards that use xHCI to see if
>>>>> they are switched to DM?
>>>>
>>>>
>>>>
>>>> xHCI is still quite new in U-Boot, so I would expect that all
>>>> platforms using it, are using DM or at least not far away from using
>>>> it. Yes, please check all xHCI "users", if they use DM. Then we
>>>> know if and which users need some "persuasion" to switch over to
>>>> DM soon. ;)
>>>
>>>
>>> I checked all boards that have CONFIG_USB_XHCI_HCD defined but without
>>> CONFIG_DM_USB. Here is the list.
>>>
>>> configs/uniphier_v8_defconfig:36:CONFIG_USB_XHCI_HCD=y
>>> configs/xilinx_zynqmp_zc1751_xm015_dc1_defconfig:62:CONFIG_USB_XHCI_HCD=y
>>> configs/am57xx_evm_nodt_defconfig:53:CONFIG_USB_XHCI_HCD=y
>>> configs/evb-rk3328_defconfig:34:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021atwr_nor_lpuart_defconfig:43:CONFIG_USB_XHCI_HCD=y
>>> configs/uniphier_pxs2_ld6b_defconfig:44:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1012ardb_qspi_SECURE_BOOT_defconfig:43:CONFIG_USB_XHCI_HCD=y
>>>
>>> configs/ls1021atwr_sdcard_ifc_SECURE_BOOT_defconfig:57:CONFIG_USB_XHCI_HCD=y
>>> configs/k2e_hs_evm_defconfig:34:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021aqds_sdcard_qspi_defconfig:61:CONFIG_USB_XHCI_HCD=y
>>> configs/am43xx_evm_ethboot_defconfig:48:CONFIG_USB_XHCI_HCD=y
>>> configs/xilinx_zynqmp_ep_defconfig:70:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021aqds_nand_defconfig:57:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021atwr_qspi_defconfig:50:CONFIG_USB_XHCI_HCD=y
>>> configs/k2g_evm_defconfig:45:CONFIG_USB_XHCI_HCD=y
>>> configs/am57xx_evm_defconfig:63:CONFIG_USB_XHCI_HCD=y
>>> configs/am43xx_hs_evm_defconfig:49:CONFIG_USB_XHCI_HCD=y
>>> configs/am43xx_evm_defconfig:39:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021atwr_nor_defconfig:42:CONFIG_USB_XHCI_HCD=y
>>> configs/firefly-rk3399_defconfig:59:CONFIG_USB_XHCI_HCD=y
>>> configs/puma-rk3399_defconfig:78:CONFIG_USB_XHCI_HCD=y
>>> configs/cl-som-am57x_defconfig:55:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021aqds_nor_SECURE_BOOT_defconfig:43:CONFIG_USB_XHCI_HCD=y
>>> configs/uniphier_pro4_defconfig:43:CONFIG_USB_XHCI_HCD=y
>>> configs/xilinx_zynqmp_zc1751_xm016_dc2_defconfig:61:CONFIG_USB_XHCI_HCD=y
>>> configs/xilinx_zynqmp_zcu102_defconfig:63:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021atwr_nor_SECURE_BOOT_defconfig:42:CONFIG_USB_XHCI_HCD=y
>>> configs/cm_t43_defconfig:67:CONFIG_USB_XHCI_HCD=y
>>> configs/k2g_hs_evm_defconfig:36:CONFIG_USB_XHCI_HCD=y
>>> configs/am43xx_evm_qspiboot_defconfig:45:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021aqds_qspi_defconfig:50:CONFIG_USB_XHCI_HCD=y
>>> configs/am57xx_hs_evm_defconfig:67:CONFIG_USB_XHCI_HCD=y
>>> configs/xilinx_zynqmp_zcu102_revB_defconfig:63:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021aqds_sdcard_ifc_defconfig:55:CONFIG_USB_XHCI_HCD=y
>>> configs/uniphier_ld20_defconfig:39:CONFIG_USB_XHCI_HCD=y
>>> configs/am43xx_evm_usbhost_boot_defconfig:61:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021atwr_sdcard_qspi_defconfig:61:CONFIG_USB_XHCI_HCD=y
>>> configs/evb-rk3399_defconfig:60:CONFIG_USB_XHCI_HCD=y
>>> configs/k2hk_evm_defconfig:43:CONFIG_USB_XHCI_HCD=y
>>> configs/k2hk_hs_evm_defconfig:34:CONFIG_USB_XHCI_HCD=y
>>> configs/k2e_evm_defconfig:43:CONFIG_USB_XHCI_HCD=y
>>> configs/ls1021atwr_sdcard_ifc_defconfig:54:CONFIG_USB_XHCI_HCD=y
>>> configs/k2l_evm_defconfig:43:CONFIG_USB_XHCI_HCD=y
>>>
>>> So it looks we have lots of conversion work to be done by many board
>>> maintainers. I am not sure how to proceed on this.
>>
>>
>> Marek reminded me, that he thinks that most of these platforms
>> above will most likely select DM_USB implicitly via Kconfig.
>>
>> I did a quick check and it seems that at least these platforms
>> have DM_USB enabled:
>>
>> ARCH_ZYNQ
>> ARCH_ZYNQMP
>> ARCH_UNIPHIER
>> ARCH_ROCKCHIP
>>
>> and other from above very likely as well.
>>
>> Before you invest more time and effort into implementing the xHCI
>> additions in a "non-DM cleaner way", I suggest to find out which
>> targets really use xHCI without USB_DM. An easy check would be to
>> add some #error to the non-DM part and run this commit through
>> buildman / travis.
>>
>> What do you think?
>
> Ah, that's really a good idea. Thanks for the hints! I will launch a
> buildman testing soon.
>

Looks we have a smaller list indeed. Here is the buildman results:

ls1012ardb_qspi_SECURE_BOOT
ls1021atwr_nor_SECURE_BOOT
am43xx_hs_evm
am57xx_hs_evm
ls1021aqds_nand
ls1021atwr_nor
ls1021atwr_qspi
cm_t43
ls1021atwr_nor_lpuart
ls1021aqds_sdcard_qspi
k2hk_hs_evm
am43xx_evm
ls1021aqds_qspi
am57xx_evm_nodt
k2g_hs_evm
ls1021atwr_sdcard_qspi
am43xx_evm_ethboot
ls1021aqds_sdcard_ifc
k2l_evm
am43xx_evm_usbhost_boot
am43xx_evm_qspiboot
k2g_evm
am57xx_evm
ls1021atwr_sdcard_ifc
cl-som-am57x
k2hk_evm
k2e_evm
ls1021atwr_sdcard_ifc_SECURE_BOOT
ls1021aqds_nor_SECURE_BOOT
k2e_hs_evm

Regards,
Bin