linux-kernel - RE: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

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Date:   Mon, 26 Aug 2019 07:53:59 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Peter Chen <peter.chen@....com>
CC:     "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "rogerq@...com" <rogerq@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>,
        Anil Joy Varughese <aniljoy@...ence.com>
Subject: RE: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

Hi Peter

>
>On 19-07-21 19:32:18, Pawel Laszczak wrote:
>> This patch introduce new Cadence USBSS DRD driver to Linux kernel.
>>
>> The Cadence USBSS DRD Controller is a highly configurable IP Core which
>> can be instantiated as Dual-Role Device (DRD), Peripheral Only and
>> Host Only (XHCI)configurations.
>>
>> The current driver has been validated with FPGA platform. We have
>> support for PCIe bus, which is used on FPGA prototyping.
>>
>> The host side of USBSS-DRD controller is compliant with XHCI
>> specification, so it works with standard XHCI Linux driver.
>>
>> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
>> ---
>>  drivers/usb/Kconfig                |    2 +
>>  drivers/usb/Makefile               |    2 +
>>  drivers/usb/cdns3/Kconfig          |   46 +
>>  drivers/usb/cdns3/Makefile         |   17 +
>>  drivers/usb/cdns3/cdns3-pci-wrap.c |  203 +++
>>  drivers/usb/cdns3/core.c           |  554 +++++++
>>  drivers/usb/cdns3/core.h           |  109 ++
>>  drivers/usb/cdns3/debug.h          |  171 ++
>>  drivers/usb/cdns3/debugfs.c        |   87 ++
>>  drivers/usb/cdns3/drd.c            |  390 +++++
>>  drivers/usb/cdns3/drd.h            |  166 ++
>>  drivers/usb/cdns3/ep0.c            |  914 +++++++++++
>>  drivers/usb/cdns3/gadget-export.h  |   28 +
>>  drivers/usb/cdns3/gadget.c         | 2338 ++++++++++++++++++++++++++++
>>  drivers/usb/cdns3/gadget.h         | 1321 ++++++++++++++++
>>  drivers/usb/cdns3/host-export.h    |   28 +
>>  drivers/usb/cdns3/host.c           |   71 +
>>  drivers/usb/cdns3/trace.c          |   11 +
>>  drivers/usb/cdns3/trace.h          |  493 ++++++
>>  19 files changed, 6951 insertions(+)
>>  create mode 100644 drivers/usb/cdns3/Kconfig
>>  create mode 100644 drivers/usb/cdns3/Makefile
>>  create mode 100644 drivers/usb/cdns3/cdns3-pci-wrap.c
>>  create mode 100644 drivers/usb/cdns3/core.c
>>  create mode 100644 drivers/usb/cdns3/core.h
>>  create mode 100644 drivers/usb/cdns3/debug.h
>>  create mode 100644 drivers/usb/cdns3/debugfs.c
>>  create mode 100644 drivers/usb/cdns3/drd.c
>>  create mode 100644 drivers/usb/cdns3/drd.h
>>  create mode 100644 drivers/usb/cdns3/ep0.c
>>  create mode 100644 drivers/usb/cdns3/gadget-export.h
>>  create mode 100644 drivers/usb/cdns3/gadget.c
>>  create mode 100644 drivers/usb/cdns3/gadget.h
>>  create mode 100644 drivers/usb/cdns3/host-export.h
>>  create mode 100644 drivers/usb/cdns3/host.c
>>  create mode 100644 drivers/usb/cdns3/trace.c
>>  create mode 100644 drivers/usb/cdns3/trace.h
>>
>
>Pawel, one question duirng my debug, what's purpose
>for below code:
>function: cdns3_gadget_ep_dequeue
>
>	/* Update ring */
>	request = cdns3_next_request(&priv_ep->deferred_req_list);

If you have on mind this line, then yes it should be removed from here. 

Driver only should allow controller to jump to next TRB in TR. 
If it's last TRB in HW ring and there is next request on deferred_req_list then
new transfer will be started in TRBERR event.

I Will remove it, 
Thanks Peter 
 
>	if (request) {
>		priv_req = to_cdns3_request(request);
>
>		link_trb->buffer = TRB_BUFFER(priv_ep->trb_pool_dma +
>					      (priv_req->start_trb * TRB_SIZE));
>		link_trb->control = (link_trb->control & TRB_CYCLE) |
>				    TRB_TYPE(TRB_LINK) | TRB_CHAIN | TRB_TOGGLE;
>	} else {
>		priv_ep->flags |= EP_UPDATE_EP_TRBADDR;
>	}
>
>Besides, would you please cc me when you send next version?
>Thanks,
>

I was always adding you.  

<snip>
>> +
>> +#include <trace/define_trace.h>
>> --
>> 2.17.1
>>

Cheers,
Pawell