From: Alan Stern <stern@rowland.harvard.edu>
To: Macpaul Lin <macpaul.lin@mediatek.com>
Cc: "Chunfeng Yun" <chunfeng.yun@mediatek.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Felipe Balbi" <balbi@kernel.org>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Sergey Organov" <sorganov@gmail.com>,
"Fabrice Gasnier" <fabrice.gasnier@st.com>,
linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
"Mediatek WSD Upstream" <wsd_upstream@mediatek.com>,
"Macpaul Lin" <macpaul.lin@gmail.com>
Subject: Re: [PATCH 1/2] usb: gadget: introduce flag for large request
Date: Tue, 16 Jun 2020 10:02:46 -0400 [thread overview]
Message-ID: <20200616140246.GA30975@rowland.harvard.edu> (raw)
In-Reply-To: <1592310884-4307-1-git-send-email-macpaul.lin@mediatek.com>
On Tue, Jun 16, 2020 at 08:34:43PM +0800, Macpaul Lin wrote:
> Some USB hardware like DMA engine can help to process (split) the data
> of each URB request into small packets. For example, the max packet size
> of high speed is 512 bytes. These kinds of hardware can help to split
> the continue Tx/Rx data requests into packets just at the max packet
> size during transmission. Hence upper layer software can reduce some
> effort for queueing many requests back and forth for larger data.
>
> Here we introduce "can_exceed_maxp" flag in gadget when these kinds of
> hardware is ready to support these operations.
This isn't needed. All UDC drivers must be able to support requests that
are larger than the maxpacket size.
Alan Stern
WARNING: multiple messages have this Message-ID (diff)
From: Alan Stern <stern@rowland.harvard.edu>
To: Macpaul Lin <macpaul.lin@mediatek.com>
Cc: "Felipe Balbi" <balbi@kernel.org>,
"Mediatek WSD Upstream" <wsd_upstream@mediatek.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"Sergey Organov" <sorganov@gmail.com>,
"Chunfeng Yun" <chunfeng.yun@mediatek.com>,
linux-mediatek@lists.infradead.org,
"Macpaul Lin" <macpaul.lin@gmail.com>,
"Fabrice Gasnier" <fabrice.gasnier@st.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/2] usb: gadget: introduce flag for large request
Date: Tue, 16 Jun 2020 10:02:46 -0400 [thread overview]
Message-ID: <20200616140246.GA30975@rowland.harvard.edu> (raw)
In-Reply-To: <1592310884-4307-1-git-send-email-macpaul.lin@mediatek.com>
On Tue, Jun 16, 2020 at 08:34:43PM +0800, Macpaul Lin wrote:
> Some USB hardware like DMA engine can help to process (split) the data
> of each URB request into small packets. For example, the max packet size
> of high speed is 512 bytes. These kinds of hardware can help to split
> the continue Tx/Rx data requests into packets just at the max packet
> size during transmission. Hence upper layer software can reduce some
> effort for queueing many requests back and forth for larger data.
>
> Here we introduce "can_exceed_maxp" flag in gadget when these kinds of
> hardware is ready to support these operations.
This isn't needed. All UDC drivers must be able to support requests that
are larger than the maxpacket size.
Alan Stern
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
WARNING: multiple messages have this Message-ID (diff)
From: Alan Stern <stern@rowland.harvard.edu>
To: Macpaul Lin <macpaul.lin@mediatek.com>
Cc: "Felipe Balbi" <balbi@kernel.org>,
"Mediatek WSD Upstream" <wsd_upstream@mediatek.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"Sergey Organov" <sorganov@gmail.com>,
"Chunfeng Yun" <chunfeng.yun@mediatek.com>,
linux-mediatek@lists.infradead.org,
"Macpaul Lin" <macpaul.lin@gmail.com>,
"Fabrice Gasnier" <fabrice.gasnier@st.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/2] usb: gadget: introduce flag for large request
Date: Tue, 16 Jun 2020 10:02:46 -0400 [thread overview]
Message-ID: <20200616140246.GA30975@rowland.harvard.edu> (raw)
In-Reply-To: <1592310884-4307-1-git-send-email-macpaul.lin@mediatek.com>
On Tue, Jun 16, 2020 at 08:34:43PM +0800, Macpaul Lin wrote:
> Some USB hardware like DMA engine can help to process (split) the data
> of each URB request into small packets. For example, the max packet size
> of high speed is 512 bytes. These kinds of hardware can help to split
> the continue Tx/Rx data requests into packets just at the max packet
> size during transmission. Hence upper layer software can reduce some
> effort for queueing many requests back and forth for larger data.
>
> Here we introduce "can_exceed_maxp" flag in gadget when these kinds of
> hardware is ready to support these operations.
This isn't needed. All UDC drivers must be able to support requests that
are larger than the maxpacket size.
Alan Stern
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-06-16 14:02 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 12:34 [PATCH 1/2] usb: gadget: introduce flag for large request Macpaul Lin
2020-06-16 12:34 ` Macpaul Lin
2020-06-16 12:34 ` Macpaul Lin
2020-06-16 12:34 ` [PATCH 2/2] usb: gadget: u_serial: improve performance for large data Macpaul Lin
2020-06-16 12:34 ` Macpaul Lin
2020-06-16 12:34 ` Macpaul Lin
2020-06-24 6:48 ` Felipe Balbi
2020-06-24 6:48 ` Felipe Balbi
2020-06-24 6:48 ` Felipe Balbi
2020-06-16 14:02 ` Alan Stern [this message]
2020-06-16 14:02 ` [PATCH 1/2] usb: gadget: introduce flag for large request Alan Stern
2020-06-16 14:02 ` Alan Stern
2020-06-17 2:27 ` Macpaul Lin
2020-06-17 2:27 ` Macpaul Lin
2020-06-17 2:27 ` Macpaul Lin
2020-06-17 2:46 ` [PATCH v2] usb: gadget: u_serial: improve performance for large data Macpaul Lin
2020-06-17 2:46 ` Macpaul Lin
2020-06-17 2:46 ` Macpaul Lin
2020-06-17 5:14 ` Greg Kroah-Hartman
2020-06-17 5:14 ` Greg Kroah-Hartman
2020-06-17 5:14 ` Greg Kroah-Hartman
2020-06-17 5:34 ` Macpaul Lin
2020-06-17 5:34 ` Macpaul Lin
2020-06-17 5:34 ` Macpaul Lin
2020-06-17 5:42 ` [PATCH v3] " Macpaul Lin
2020-06-17 5:42 ` Macpaul Lin
2020-06-17 5:42 ` Macpaul Lin
2020-06-24 6:50 ` Felipe Balbi
2020-06-24 6:50 ` Felipe Balbi
2020-06-24 6:50 ` Felipe Balbi
2020-06-24 6:47 ` [PATCH 1/2] usb: gadget: introduce flag for large request Felipe Balbi
2020-06-24 6:47 ` Felipe Balbi
2020-06-24 6:47 ` Felipe Balbi
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