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Sun, 07 Mar 2021 18:00:30 -0800 Received: from MTKMBS06N2.mediatek.inc (172.21.101.130) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sun, 7 Mar 2021 17:59:05 -0800 Received: from MTKCAS32.mediatek.inc (172.27.4.184) by mtkmbs06n2.mediatek.inc (172.21.101.130) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 8 Mar 2021 09:58:37 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS32.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 8 Mar 2021 09:58:36 +0800 Message-ID: <1615168716.32109.6.camel@mhfsdcap03> Subject: Re: [PATCH 16/17] usb: common: add function to get interval expressed in us unit From: Chunfeng Yun To: Alan Stern CC: Mathias Nyman , Greg Kroah-Hartman , Ikjoon Jang , "Matthias Brugger" , , , , , Nicolas Boichat , Eddie Hung Date: Mon, 8 Mar 2021 09:58:36 +0800 In-Reply-To: <20210305153312.GA38200@rowland.harvard.edu> References: <1614934975-15188-1-git-send-email-chunfeng.yun@mediatek.com> <1614934975-15188-16-git-send-email-chunfeng.yun@mediatek.com> <20210305153312.GA38200@rowland.harvard.edu> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: AA76056FEB5929E229E6F99F439BC3A0267241E9DCA4D6CBEACABBBCC2768C852000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210308_020040_653665_61FA62BD X-CRM114-Status: GOOD ( 19.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 2021-03-05 at 10:33 -0500, Alan Stern wrote: > On Fri, Mar 05, 2021 at 05:02:54PM +0800, Chunfeng Yun wrote: > > Add a new function to convert bInterval into the time expressed > > in 1us unit. > > > > Signed-off-by: Chunfeng Yun > > --- > > > --- a/drivers/usb/common/common.c > > +++ b/drivers/usb/common/common.c > > @@ -165,6 +165,39 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev) > > } > > EXPORT_SYMBOL_GPL(usb_get_dr_mode); > > > > +unsigned int usb_decode_interval(const struct usb_endpoint_descriptor *epd, > > + enum usb_device_speed speed) > > +{ > > + unsigned int interval = 0; > > + > > + switch (usb_endpoint_type(epd)) { > > + case USB_ENDPOINT_XFER_CONTROL: > > + /* uframes per NAK */ > > + if (speed == USB_SPEED_HIGH) > > + interval = epd->bInterval; > > + break; > > + case USB_ENDPOINT_XFER_ISOC: > > + interval = 1 << (epd->bInterval - 1); > > + break; > > + case USB_ENDPOINT_XFER_BULK: > > + /* uframes per NAK */ > > + if (speed == USB_SPEED_HIGH && usb_endpoint_dir_out(epd)) > > + interval = epd->bInterval; > > + break; > > + case USB_ENDPOINT_XFER_INT: > > + if (speed >= USB_SPEED_HIGH) > > + interval = 1 << (epd->bInterval - 1); > > + else > > + interval = epd->bInterval; > > + break; > > + } > > + > > + interval *= (speed >= USB_SPEED_HIGH) ? 125 : 1000; > > + > > + return interval; > > +} > > +EXPORT_SYMBOL_GPL(usb_decode_interval); > > > --- a/include/linux/usb/ch9.h > > +++ b/include/linux/usb/ch9.h > > @@ -90,6 +90,17 @@ extern enum usb_ssp_rate usb_get_maximum_ssp_rate(struct device *dev); > > */ > > extern const char *usb_state_string(enum usb_device_state state); > > > > +/** > > + * usb_decode_interval - Decode bInterval into the time expressed in 1us unit > > + * @epd: The descriptor of the endpoint > > + * @speed: The speed that the endpoint works as > > + * > > + * Function returns the interval expressed in 1us unit for servicing > > + * endpoint for data transfers. > > + */ > > +unsigned int usb_decode_interval(const struct usb_endpoint_descriptor *epd, > > + enum usb_device_speed speed); > > As a general rule, I believe people expect to find the kerneldoc for a > function next to the function's definition, not next to the declaration > in a header file. Got it, thanks > > Alan Stern _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel