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Date: Thu, 5 May 2022 10:21:11 +0800
From: Peter Chen <peter.chen@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: pawell@...ence.com, rogerq@...nel.org, a-govindraju@...com,
linux-usb@...r.kernel.org, jun.li@....com, lznuaa@...il.com,
gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 1/1] usb: cdns3: allocate TX FIFO size according to
composite EP number
On 22-04-27 11:35:25, Frank Li wrote:
> Some devices have USB compositions which may require multiple endpoints.
> To get better performance, need bigger CDNS3_EP_BUF_SIZE.
>
> But bigger CDNS3_EP_BUF_SIZE may exceed total hardware FIFO size when
> multiple endpoints.
>
> By introducing the check_config() callback, calculate CDNS3_EP_BUF_SIZE.
>
> Move CDNS3_EP_BUF_SIZE into cnds3_device: ep_buf_size
> Combine CDNS3_EP_ISO_SS_BURST and CDNS3_EP_ISO_HS_MULT into
> ecnds3_device:ep_iso_burst
typo, and would you please explain usage for ep_iso_burst in your patch?
>
> Using a simple algorithm to calculate ep_buf_size.
> ep_buf_size = ep_iso_burst = (onchip_buffers - 2k) / (number of IN EP +
> 1).
>
> Test at 8qxp:
>
> Gadget ep_buf_size
>
> RNDIS: 5
> RNDIS+ACM: 3
> Mass Storage + NCM + ACM 2
>
> Previous CDNS3_EP_BUF_SIZE is 4, RNDIS + ACM will be failure because
> exceed FIFO memory.
>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> Change from v1 to v2:
> Add safe check for mult, buffering and maxburst
>
> drivers/usb/cdns3/cdns3-gadget.c | 50 +++++++++++++++++++++++++++++---
> drivers/usb/cdns3/cdns3-gadget.h | 9 ++++--
> 2 files changed, 52 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 1f3b4a1422126..e25e7a2b55862 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -2050,7 +2050,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
> u8 mult = 0;
> int ret;
>
> - buffering = CDNS3_EP_BUF_SIZE - 1;
> + buffering = priv_dev->ep_buf_size - 1;
>
> cdns3_configure_dmult(priv_dev, priv_ep);
>
> @@ -2069,7 +2069,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
> break;
> default:
> ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
> - mult = CDNS3_EP_ISO_HS_MULT - 1;
> + mult = priv_dev->ep_iso_burst - 1;
> buffering = mult + 1;
> }
>
> @@ -2085,14 +2085,14 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
> mult = 0;
> max_packet_size = 1024;
> if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
> - maxburst = CDNS3_EP_ISO_SS_BURST - 1;
> + maxburst = priv_dev->ep_iso_burst - 1;
> buffering = (mult + 1) *
> (maxburst + 1);
>
> if (priv_ep->interval > 1)
> buffering++;
> } else {
> - maxburst = CDNS3_EP_BUF_SIZE - 1;
> + maxburst = priv_dev->ep_buf_size - 1;
> }
> break;
> default:
> @@ -2136,6 +2136,10 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
> ep_cfg |= EP_CFG_STREAM_EN | EP_CFG_TDL_CHK | EP_CFG_SID_CHK;
> }
>
> + mult = min_t(u8, mult, EP_CFG_MULT_MAX);
> + buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX);
> + maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX);
> +
> ep_cfg |= EP_CFG_MAXPKTSIZE(max_packet_size) |
> EP_CFG_MULT(mult) |
> EP_CFG_BUFFERING(buffering) |
> @@ -2970,6 +2974,43 @@ static int cdns3_gadget_udc_stop(struct usb_gadget *gadget)
> return 0;
> }
>
> +/**
> + * cdns3_gadget_check_config - ensure cdns3 can support the USB configuration
> + * @gadget: pointer to the USB gadget
> + *
> + * Used to record the maximum number of endpoints being used in a USB composite
> + * device. (across all configurations) This is to be used in the calculation
> + * of the TXFIFO sizes when resizing internal memory for individual endpoints.
> + * It will help ensured that the resizing logic reserves enough space for at
> + * least one max packet.
> + */
> +static int cdns3_gadget_check_config(struct usb_gadget *gadget)
> +{
> + struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
> + struct usb_ep *ep;
> + int n_in = 0;
> + int total;
> +
> + list_for_each_entry(ep, &gadget->ep_list, ep_list) {
> + if (ep->claimed && (ep->address & USB_DIR_IN))
> + n_in++;
> + }
> +
> + priv_dev->ep_buf_size = 1;
> + priv_dev->ep_iso_burst = 1;
You will re-calculate above variables below, why need to initialize them?
Peter
> +
> + /* 2KB are reserved for EP0, 1KB for out*/
> + total = 2 + n_in + 1;
> +
> + if (total > priv_dev->onchip_buffers)
> + return -ENOMEM;
> +
> + priv_dev->ep_buf_size = priv_dev->ep_iso_burst =
> + (priv_dev->onchip_buffers - 2) / (n_in + 1);
> +
> + return 0;
> +}
> +
> static const struct usb_gadget_ops cdns3_gadget_ops = {
> .get_frame = cdns3_gadget_get_frame,
> .wakeup = cdns3_gadget_wakeup,
> @@ -2978,6 +3019,7 @@ static const struct usb_gadget_ops cdns3_gadget_ops = {
> .udc_start = cdns3_gadget_udc_start,
> .udc_stop = cdns3_gadget_udc_stop,
> .match_ep = cdns3_gadget_match_ep,
> + .check_config = cdns3_gadget_check_config,
> };
>
> static void cdns3_free_all_eps(struct cdns3_device *priv_dev)
> diff --git a/drivers/usb/cdns3/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h
> index c5660f2c4293f..fbe4a8e3aa897 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.h
> +++ b/drivers/usb/cdns3/cdns3-gadget.h
> @@ -562,15 +562,18 @@ struct cdns3_usb_regs {
> /* Max burst size (used only in SS mode). */
> #define EP_CFG_MAXBURST_MASK GENMASK(11, 8)
> #define EP_CFG_MAXBURST(p) (((p) << 8) & EP_CFG_MAXBURST_MASK)
> +#define EP_CFG_MAXBURST_MAX 15
> /* ISO max burst. */
> #define EP_CFG_MULT_MASK GENMASK(15, 14)
> #define EP_CFG_MULT(p) (((p) << 14) & EP_CFG_MULT_MASK)
> +#define EP_CFG_MULT_MAX 2
> /* ISO max burst. */
> #define EP_CFG_MAXPKTSIZE_MASK GENMASK(26, 16)
> #define EP_CFG_MAXPKTSIZE(p) (((p) << 16) & EP_CFG_MAXPKTSIZE_MASK)
> /* Max number of buffered packets. */
> #define EP_CFG_BUFFERING_MASK GENMASK(31, 27)
> #define EP_CFG_BUFFERING(p) (((p) << 27) & EP_CFG_BUFFERING_MASK)
> +#define EP_CFG_BUFFERING_MAX 15
>
> /* EP_CMD - bitmasks */
> /* Endpoint reset. */
> @@ -1094,9 +1097,6 @@ struct cdns3_trb {
> #define CDNS3_ENDPOINTS_MAX_COUNT 32
> #define CDNS3_EP_ZLP_BUF_SIZE 1024
>
> -#define CDNS3_EP_BUF_SIZE 4 /* KB */
> -#define CDNS3_EP_ISO_HS_MULT 3
> -#define CDNS3_EP_ISO_SS_BURST 3
> #define CDNS3_MAX_NUM_DESCMISS_BUF 32
> #define CDNS3_DESCMIS_BUF_SIZE 2048 /* Bytes */
> #define CDNS3_WA2_NUM_BUFFERS 128
> @@ -1333,6 +1333,9 @@ struct cdns3_device {
> /*in KB */
> u16 onchip_buffers;
> u16 onchip_used_size;
> +
> + u16 ep_buf_size;
> + u16 ep_iso_burst;
> };
>
> void cdns3_set_register_bit(void __iomem *ptr, u32 mask);
> --
> 2.35.1
>
--
Thanks,
Peter Chen
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