linux-kernel - Re: [PATCH v13 3/6] usb: dwc3: Resize TX FIFOs to meet EP bursting requirements

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Date:   Fri, 9 Jul 2021 07:41:23 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wesley Cheng <wcheng@...eaurora.org>
Cc:     robh+dt@...nel.org, frowand.list@...il.com, balbi@...nel.org,
        agross@...nel.org, bjorn.andersson@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        jackp@...eaurora.org, fntoth@...il.com
Subject: Re: [PATCH v13 3/6] usb: dwc3: Resize TX FIFOs to meet EP bursting
 requirements

On Thu, Jul 08, 2021 at 05:27:51PM -0700, Wesley Cheng wrote:
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index dccdf13..dd985ba 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1023,6 +1023,7 @@ struct dwc3_scratchpad_array {
>   * @rx_max_burst_prd: max periodic ESS receive burst size
>   * @tx_thr_num_pkt_prd: periodic ESS transmit packet count
>   * @tx_max_burst_prd: max periodic ESS transmit burst size
> + * @tx_fifo_resize_max_num: max number of fifos allocated during txfifo resize
>   * @hsphy_interface: "utmi" or "ulpi"
>   * @connected: true when we're connected to a host, false otherwise
>   * @delayed_status: true when gadget driver asks for delayed status
> @@ -1079,6 +1080,11 @@ struct dwc3_scratchpad_array {
>   * @dis_split_quirk: set to disable split boundary.
>   * @imod_interval: set the interrupt moderation interval in 250ns
>   *			increments or 0 to disable.
> + * @max_cfg_eps: current max number of IN eps used across all USB configs.
> + * @last_fifo_depth: last fifo depth used to determine next fifo ram start
> + *		     address.
> + * @num_ep_resized: carries the current number endpoints which have had its tx
> + *		    fifo resized.
>   */
>  struct dwc3 {
>  	struct work_struct	drd_work;
> @@ -1233,6 +1239,7 @@ struct dwc3 {
>  	u8			rx_max_burst_prd;
>  	u8			tx_thr_num_pkt_prd;
>  	u8			tx_max_burst_prd;
> +	u8			tx_fifo_resize_max_num;
>  
>  	const char		*hsphy_interface;
>  
> @@ -1246,6 +1253,7 @@ struct dwc3 {
>  	unsigned		is_utmi_l1_suspend:1;
>  	unsigned		is_fpga:1;
>  	unsigned		pending_events:1;
> +	unsigned		do_fifo_resize:1;
>  	unsigned		pullups_connected:1;
>  	unsigned		setup_packet_pending:1;
>  	unsigned		three_stage_setup:1;
> @@ -1281,6 +1289,10 @@ struct dwc3 {
>  	unsigned		dis_split_quirk:1;
>  
>  	u16			imod_interval;
> +
> +	int			max_cfg_eps;
> +	int			last_fifo_depth;
> +	int			num_ep_resized;
>  };
>  

You document 4 new variables being added, but add 5 variables to the
structure.  Something is out of sync :(