From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B0BCC433F5 for ; Thu, 5 May 2022 15:24:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1380648AbiEEP2I (ORCPT ); Thu, 5 May 2022 11:28:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231313AbiEEP2D (ORCPT ); Thu, 5 May 2022 11:28:03 -0400 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D1D19562E4; Thu, 5 May 2022 08:24:23 -0700 (PDT) Received: by mail-pl1-x62e.google.com with SMTP id c11so4690937plg.13; Thu, 05 May 2022 08:24:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=X7UgOJpODCCzVHelmcam20Hp1JBBX/wq27Ql9T567Mc=; b=LBgFNu4en6DBcix95YtrEHtGbb3wf9tcRXROQQSKmS6SSstHktRxW+mnyNnLMhSWS3 8sBBEEgrY9ZQtHRFeZwCALrdSe5GKwd3+VJGOVwVkj/2Q5/u/BViJzR0fVUFh9eQoX/x yteR4Hw0Ornh++UqVRxnrJwDQMQ420kTlwpPQbvEZ4msi6B8E7LVmkuWpdfcQNs36CFf Qw2iTe9dscysniCNSB0jSpeKboFObaO1YCS8HFb9R8qb7ouPaqHz3Rxa910a9LnJVieb WkBY1qgDKD7kSdMmGEq/MaQd+WBtqHj+5tkwUK0mtTiU+DKnwF56G3KqQasZruDRHm9s 7CKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=X7UgOJpODCCzVHelmcam20Hp1JBBX/wq27Ql9T567Mc=; b=VgATleOEf+twfB/teAC2R0VienP2iQJqaKI1j/K0jYyXMwVrxtKfySrl47cQ3T8wH3 qVBwNKGCrgzC8bBi+GVy0gKWHzklL2JiAPHSyVRbJytrG0usWFBdat+4oNWjnHcgpB+O PU29dFabdmYZbhVnYa+6YsBAlBloEG5ZXlq/HPxLLM5XFqXj7fFar/LGckzexTVc/iaZ zNsBjA2Dd15jE8cGXLNE/F/tOTJrx22EyfUDsUDE4QOBfrmahKpZ9IemTZQgJ5zbQkcA TTMnnPqZk2TriX+/amZX9DZms7XGZ+1e9jrZM0Pk2jSLk1gmX0LWnUAtcZZKOm4Xs/ry mxHg== X-Gm-Message-State: AOAM530Vhucm2RJrGQD7oM+J1+hpkMZl0USl/Y4/22GErkaTBT/va9+R x5K4s40Zz9OqcjbJEeZltRuJgHy8dtfeH3Nmskg= X-Google-Smtp-Source: ABdhPJw0aOEdlL5AJXiQ2SduNodUGIVPOsxO7CsTpyOIEK/giykM8vqevwkptyiMfqY+F6th9MxIDt//gGYYTGJLhKM= X-Received: by 2002:a17:903:32c2:b0:15e:c1cc:2410 with SMTP id i2-20020a17090332c200b0015ec1cc2410mr11028514plr.127.1651764263176; Thu, 05 May 2022 08:24:23 -0700 (PDT) MIME-Version: 1.0 References: <20220427163525.1129887-1-Frank.Li@nxp.com> <20220505022111.GA433739@Peter> In-Reply-To: <20220505022111.GA433739@Peter> From: Zhi Li Date: Thu, 5 May 2022 10:24:12 -0500 Message-ID: Subject: Re: [PATCH v8 1/1] usb: cdns3: allocate TX FIFO size according to composite EP number To: Peter Chen Cc: Frank Li , pawell@cadence.com, rogerq@kernel.org, a-govindraju@ti.com, linux-usb@vger.kernel.org, Jun Li , Greg KH , kernel list Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 4, 2022 at 9:21 PM Peter Chen wrote: > > 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? ep_iso_burst just directly replaced old CDNS3_EP_ISO_SS_BURST. This patch uses a simple algorithm to make ep_buf_size equal to ep_iso_burst. using ep_iso_burst reduces code change and keeps old code logic. Keep capability to finial tune ep_iso_burst for ep_buf_size in future for difference composite devices combination user case. > > > > > 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 > > --- > > 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? I worry about it is 0 or other random data at below error return branch. Anyway, it should be okay to remove it. > > 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 >