linux-kernel - RE: [PATCH 3/6] usb: cdnsp: fix the wrong mult value for HS isoc or intr

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Message-ID: <BYAPR07MB53815317736C694887D51BE8DDFE9@BYAPR07MB5381.namprd07.prod.outlook.com>
Date:   Tue, 17 Aug 2021 05:05:26 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Al Cooper <alcooperx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Rikard Falkeborn <rikard.falkeborn@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bcm-kernel-feedback-list@...adcom.com" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: RE: [PATCH 3/6] usb: cdnsp: fix the wrong mult value for HS isoc or
 intr

>
>Chunfeng Yun <chunfeng.yun@...iatek.com> writes:
>
>> usb_endpoint_maxp() only returns the bit[10:0] of wMaxPacketSize
>> of endpoint descriptor, not include bit[12:11] anymore, so use
>> usb_endpoint_maxp_mult() instead.
>>
>> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
>> ---
>>  drivers/usb/cdns3/cdnsp-mem.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/cdns3/cdnsp-mem.c b/drivers/usb/cdns3/cdnsp-mem.c
>> index a47948a1623f..ad9aee3f1e39 100644
>> --- a/drivers/usb/cdns3/cdnsp-mem.c
>> +++ b/drivers/usb/cdns3/cdnsp-mem.c
>> @@ -882,7 +882,7 @@ static u32 cdnsp_get_endpoint_max_burst(struct usb_gadget *g,
>>  	if (g->speed == USB_SPEED_HIGH &&
>>  	    (usb_endpoint_xfer_isoc(pep->endpoint.desc) ||
>>  	     usb_endpoint_xfer_int(pep->endpoint.desc)))
>> -		return (usb_endpoint_maxp(pep->endpoint.desc) & 0x1800) >> 11;
>> +		return usb_endpoint_maxp_mult(pep->endpoint.desc) - 1;
>
>this looks like a bugfix. Do we need to Cc stable here?
>
>In any case:
>
>Acked-by: Felipe Balbi <balbi@...nel.org>
>

It's not a bugfix. The result is the same.

Acked-by: Pawel Laszczak <pawell@...ence.com>

--

Thanks 
Pawel Laszczak