From patchwork Thu May 28 01:46:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 214983 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21E8DC433E0 for ; Thu, 28 May 2020 01:46:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB17920888 for ; Thu, 28 May 2020 01:46:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="MxVAM0Yo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726555AbgE1BqZ (ORCPT ); Wed, 27 May 2020 21:46:25 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:34147 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726718AbgE1BqX (ORCPT ); Wed, 27 May 2020 21:46:23 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1590630383; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=l9B/gzqlAS8NE44VPQ5/6JILP+hxzI2RdVbiQmZKk3w=; b=MxVAM0YodloTTH0ZBUtBQ98EYQCXfCx14i+E6So9ZIOSDLj9gbK2A5PLPtpKzNCMkDG9lTUS Zdmc3pVMaCyj+JTSAPyKVzG4PAGdr2NKgb7b/dAt8aFO7CTrjtBsdEUbAAIn1XS3DWV+pwJe bARyoXeE6nLx/YzHk3rl1wTqi4M= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyIxZTE2YSIsICJsaW51eC11c2JAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n03.prod.us-east-1.postgun.com with SMTP id 5ecf17e3c0031c71c2be9df0 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 28 May 2020 01:46:11 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 4DC31C43395; Thu, 28 May 2020 01:46:10 +0000 (UTC) Received: from wcheng-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: wcheng) by smtp.codeaurora.org (Postfix) with ESMTPSA id 00B7CC433CA; Thu, 28 May 2020 01:46:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 00B7CC433CA Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=wcheng@codeaurora.org From: Wesley Cheng To: robh+dt@kernel.org, bjorn.andersson@linaro.org, balbi@kernel.org, gregkh@linuxfoundation.org, agross@kernel.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-usb@vger.kernel.org, Wesley Cheng Subject: [RFC v3 1/3] usb: dwc3: Resize TX FIFOs to meet EP bursting requirements Date: Wed, 27 May 2020 18:46:01 -0700 Message-Id: <1590630363-3934-2-git-send-email-wcheng@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1590630363-3934-1-git-send-email-wcheng@codeaurora.org> References: <1590630363-3934-1-git-send-email-wcheng@codeaurora.org> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Some devices have USB compositions which may require multiple endpoints that support EP bursting. HW defined TX FIFO sizes may not always be sufficient for these compositions. By utilizing flexible TX FIFO allocation, this allows for endpoints to request the required FIFO depth to achieve higher bandwidth. With some higher bMaxBurst configurations, using a larger TX FIFO size results in better TX throughput. Ensure that one TX FIFO is reserved for every IN endpoint. This allows for the FIFO logic to prevent running out of FIFO space. Signed-off-by: Wesley Cheng --- drivers/usb/dwc3/core.c | 2 + drivers/usb/dwc3/core.h | 8 ++++ drivers/usb/dwc3/ep0.c | 37 ++++++++++++++- drivers/usb/dwc3/gadget.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 161 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index edc1715..cca5554 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1304,6 +1304,8 @@ static void dwc3_get_properties(struct dwc3 *dwc) &tx_thr_num_pkt_prd); device_property_read_u8(dev, "snps,tx-max-burst-prd", &tx_max_burst_prd); + dwc->needs_fifo_resize = device_property_read_bool(dev, + "tx-fifo-resize"); dwc->disable_scramble_quirk = device_property_read_bool(dev, "snps,disable_scramble_quirk"); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 4c171a8..ce0bf28 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -675,6 +675,7 @@ struct dwc3_event_buffer { * isochronous START TRANSFER command failure workaround * @start_cmd_status: the status of testing START TRANSFER command with * combo_num = 'b00 + * @fifo_depth: allocated TXFIFO depth */ struct dwc3_ep { struct usb_ep endpoint; @@ -727,6 +728,7 @@ struct dwc3_ep { /* For isochronous START TRANSFER workaround only */ u8 combo_num; int start_cmd_status; + int fifo_depth; }; enum dwc3_phy { @@ -1004,6 +1006,7 @@ struct dwc3_scratchpad_array { * 1 - utmi_l1_suspend_n * @is_fpga: true when we are using the FPGA board * @pending_events: true when we have pending IRQs to be handled + * @needs_fifo_resize: not all users might want fifo resizing, flag it * @pullups_connected: true when Run/Stop bit is set * @setup_packet_pending: true when there's a Setup Packet in FIFO. Workaround * @three_stage_setup: set if we perform a three phase setup @@ -1044,6 +1047,8 @@ struct dwc3_scratchpad_array { * @dis_metastability_quirk: set to disable metastability quirk. * @imod_interval: set the interrupt moderation interval in 250ns * increments or 0 to disable. + * @last_fifo_depth: total TXFIFO depth of all enabled USB IN/INT endpoints + * @num_ep_resized: the number of TX FIFOs that have already been resized */ struct dwc3 { struct work_struct drd_work; @@ -1204,6 +1209,7 @@ struct dwc3 { unsigned is_utmi_l1_suspend:1; unsigned is_fpga:1; unsigned pending_events:1; + unsigned needs_fifo_resize:1; unsigned pullups_connected:1; unsigned setup_packet_pending:1; unsigned three_stage_setup:1; @@ -1236,6 +1242,8 @@ struct dwc3 { unsigned dis_metastability_quirk:1; u16 imod_interval; + int last_fifo_depth; + int num_ep_resized; }; #define INCRX_BURST_MODE 0 diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index 6dee4da..76db9b5 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -601,8 +601,9 @@ static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) { enum usb_device_state state = dwc->gadget.state; u32 cfg; - int ret; + int ret, num, size; u32 reg; + struct dwc3_ep *dep; cfg = le16_to_cpu(ctrl->wValue); @@ -611,6 +612,40 @@ static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) return -EINVAL; case USB_STATE_ADDRESS: + /* + * If tx-fifo-resize flag is not set for the controller, then + * do not clear existing allocated TXFIFO since we do not + * allocate it again in dwc3_gadget_resize_tx_fifos + */ + if (dwc->needs_fifo_resize) { + /* Read ep0IN related TXFIFO size */ + dep = dwc->eps[1]; + size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0)); + if (dwc3_is_usb31(dwc)) + dep->fifo_depth = DWC31_GTXFIFOSIZ_TXFDEP(size); + else + dep->fifo_depth = DWC3_GTXFIFOSIZ_TXFDEP(size); + + dwc->last_fifo_depth = dep->fifo_depth; + /* Clear existing TXFIFO for all IN eps except ep0 */ + for (num = 3; num < min_t(int, dwc->num_eps, + DWC3_ENDPOINTS_NUM); num += 2) { + dep = dwc->eps[num]; + /* Don't change TXFRAMNUM on usb31 version */ + size = dwc3_is_usb31(dwc) ? + dwc3_readl(dwc->regs, + DWC3_GTXFIFOSIZ(num >> 1)) & + DWC31_GTXFIFOSIZ_TXFRAMNUM : + 0; + + dwc3_writel(dwc->regs, + DWC3_GTXFIFOSIZ(num >> 1), + size); + dep->fifo_depth = 0; + } + dwc->num_ep_resized = 0; + } + ret = dwc3_ep0_delegate_req(dwc, ctrl); /* if the cfg matches and the cfg is non zero */ if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) { diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 00746c2..9b09528 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -540,6 +540,117 @@ static int dwc3_gadget_start_config(struct dwc3_ep *dep) return 0; } +/* + * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case + * @dwc: pointer to our context structure + * + * This function will a best effort FIFO allocation in order + * to improve FIFO usage and throughput, while still allowing + * us to enable as many endpoints as possible. + * + * Keep in mind that this operation will be highly dependent + * on the configured size for RAM1 - which contains TxFifo -, + * the amount of endpoints enabled on coreConsultant tool, and + * the width of the Master Bus. + * + * In general, FIFO depths are represented with the following equation: + * + * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1 + * + * Conversions can be done to the equation to derive the number of packets that + * will fit to a particular FIFO size value. + */ +static int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc, struct dwc3_ep *dep) +{ + int ram1_depth, mdwidth, fifo_0_start, tmp, num_in_ep; + int min_depth, remaining, fifo_size, mult = 1, fifo, max_packet = 1024; + + if (!dwc->needs_fifo_resize) + return 0; + + /* resize IN endpoints except ep0 */ + if (!usb_endpoint_dir_in(dep->endpoint.desc) || dep->number <= 1) + return 0; + + /* Don't resize already resized IN endpoint */ + if (dep->fifo_depth) + return 0; + + ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7); + mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0); + /* MDWIDTH is represented in bits, we need it in bytes */ + mdwidth >>= 3; + + if (((dep->endpoint.maxburst > 1) && + usb_endpoint_xfer_bulk(dep->endpoint.desc)) + || usb_endpoint_xfer_isoc(dep->endpoint.desc)) + mult = 3; + + if ((dep->endpoint.maxburst > 6) && + usb_endpoint_xfer_bulk(dep->endpoint.desc) + && dwc3_is_usb31(dwc)) + mult = 6; + + /* FIFO size for a single buffer */ + fifo = (max_packet + mdwidth)/mdwidth; + fifo++; + + /* Calculate the number of remaining EPs w/o any FIFO */ + num_in_ep = dwc->num_eps/2; + num_in_ep -= dwc->num_ep_resized; + /* Ignore EP0 IN */ + num_in_ep--; + + /* Reserve at least one FIFO for the number of IN EPs */ + min_depth = num_in_ep * (fifo+1); + remaining = ram1_depth - min_depth - dwc->last_fifo_depth; + + /* We've already reserved 1 FIFO per EP, so check what we can fit in + * addition to it. If there is not enough remaining space, allocate + * all the remaining space to the EP. + */ + fifo_size = (mult-1) * fifo; + if (remaining < fifo_size) { + if (remaining > 0) + fifo_size = remaining; + else + fifo_size = 0; + } + + fifo_size += fifo; + fifo_size++; + dep->fifo_depth = fifo_size; + + /* Check if TXFIFOs start at non-zero addr */ + tmp = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0)); + fifo_0_start = DWC3_GTXFIFOSIZ_TXFSTADDR(tmp); + + fifo_size |= (fifo_0_start + (dwc->last_fifo_depth << 16)); + if (dwc3_is_usb31(dwc)) + dwc->last_fifo_depth += DWC31_GTXFIFOSIZ_TXFDEP(fifo_size); + else + dwc->last_fifo_depth += DWC3_GTXFIFOSIZ_TXFDEP(fifo_size); + + /* Check fifo size allocation doesn't exceed available RAM size. */ + if (dwc->last_fifo_depth >= ram1_depth) { + dev_err(dwc->dev, "Fifosize(%d) > RAM size(%d) %s depth:%d\n", + (dwc->last_fifo_depth * mdwidth), ram1_depth, + dep->endpoint.name, fifo_size); + if (dwc3_is_usb31(dwc)) + fifo_size = DWC31_GTXFIFOSIZ_TXFDEP(fifo_size); + else + fifo_size = DWC3_GTXFIFOSIZ_TXFDEP(fifo_size); + dwc->last_fifo_depth -= fifo_size; + dep->fifo_depth = 0; + WARN_ON(1); + return -ENOMEM; + } + + dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1), fifo_size); + dwc->num_ep_resized++; + return 0; +} + static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action) { const struct usb_ss_ep_comp_descriptor *comp_desc; @@ -620,6 +731,10 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action) int ret; if (!(dep->flags & DWC3_EP_ENABLED)) { + ret = dwc3_gadget_resize_tx_fifos(dwc, dep); + if (ret) + return ret; + ret = dwc3_gadget_start_config(dep); if (ret) return ret;