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Wed, 18 Dec 2024 07:51:53 -0800 (PST) Date: Wed, 18 Dec 2024 10:51:49 -0500 From: Alan Stern To: Selvarasu Ganesan Cc: Greg KH , quic_jjohnson@quicinc.com, kees@kernel.org, abdul.rahim@myyahoo.com, m.grzeschik@pengutronix.de, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, jh0801.jung@samsung.com, dh10.jung@samsung.com, naushad@samsung.com, akash.m5@samsung.com, rc93.raju@samsung.com, taehyun.cho@samsung.com, hongpooh.kim@samsung.com, eomji.oh@samsung.com, shijie.cai@samsung.com, alim.akhtar@samsung.com, stable@vger.kernel.org Subject: Re: [PATCH] usb: gadget: f_midi: Fixing wMaxPacketSize exceeded issue during MIDI bind retries Message-ID: References: <20241208152322.1653-1-selvarasu.g@samsung.com> <2024121845-cactus-geology-8df3@gregkh> <9f16a8ac-1623-425e-a46e-41e4133218e5@samsung.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9f16a8ac-1623-425e-a46e-41e4133218e5@samsung.com> On Wed, Dec 18, 2024 at 03:51:50PM +0530, Selvarasu Ganesan wrote: > The issue arises during the second time the "f_midi_bind" function is > called. The problem lies in the fact that the size of > "bulk_in_desc.wMaxPacketSize" is set to 1024 during the first call, > which exceeds the hardware capability of the dwc3 TX/RX FIFO > (ep->maxpacket_limit = 512). Is this gadget supposed to be able to run at SuperSpeed? I thought the dwc3 controller supported SuperSpeed operation. The USB-3 spec requires that all SuperSpeed bulk endpoints must have a wMaxPacketSize of 1024 (see Table 9-24 on p.9-25 of the USB-3.1 specification). Alan Stern