linux-kernel - Re: [PATCH v10 3/6] usb: dwc3: Resize TX FIFOs to meet EP bursting requirements

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Date:   Thu, 17 Jun 2021 13:10:36 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wesley Cheng <wcheng@...eaurora.org>
Cc:     balbi@...nel.org, robh+dt@...nel.org, agross@...nel.org,
        bjorn.andersson@...aro.org, frowand.list@...il.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        jackp@...eaurora.org, fntoth@...il.com,
        heikki.krogerus@...ux.intel.com, andy.shevchenko@...il.com
Subject: Re: [PATCH v10 3/6] usb: dwc3: Resize TX FIFOs to meet EP bursting
 requirements

On Thu, Jun 17, 2021 at 02:58:16AM -0700, Wesley Cheng wrote:
> +static int dwc3_gadget_check_config(struct usb_gadget *g, unsigned long ep_map)
> +{
> +	struct dwc3 *dwc = gadget_to_dwc(g);
> +	unsigned long in_ep_map;
> +	int fifo_size = 0;
> +	int ram1_depth;
> +	int ep_num;
> +
> +	if (!dwc->do_fifo_resize)
> +		return 0;
> +
> +	/* Only interested in the IN endpoints */
> +	in_ep_map = ep_map >> 16;

Wait, this "map" is split up into 16/16 somehow?  So it's only 32bits
big?

Where did you document this map structure?  Why is it needed at all, you
have the gadget, don't you have access to the full list of endpoints
here as well?

confused,

greg k-h