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Sat, 21 Jul 2018 03:28:58 -0700 Received: from [127.0.0.1] (helo=localhost) by xsj-pvapsmtp01 with smtp (Exim 4.63) (envelope-from ) id 1fgp89-0005g0-Kg; Sat, 21 Jul 2018 03:28:53 -0700 Received: from xsj-pvapsmtp01 (xsj-smtp1.xilinx.com [149.199.38.66]) by xsj-smtp-dlp1.xlnx.xilinx.com (8.13.8/8.13.1) with ESMTP id w6LASgjY026745; Sat, 21 Jul 2018 03:28:42 -0700 Received: from [172.23.64.8] (helo=xhdvnc108.xilinx.com) by xsj-pvapsmtp01 with esmtp (Exim 4.63) (envelope-from ) id 1fgp7y-0005eL-7i; Sat, 21 Jul 2018 03:28:42 -0700 Received: by xhdvnc108.xilinx.com (Postfix, from userid 15427) id 6788C604CB; Sat, 21 Jul 2018 15:58:41 +0530 (IST) From: Anurag Kumar Vulisha To: , , , CC: , , , , Anurag Kumar Vulisha Subject: [PATCH] usb: dwc3: core: Add quirk for enabling AutoRetry feature in the controller Date: Sat, 21 Jul 2018 15:58:40 +0530 Message-ID: <1532168920-3269-1-git-send-email-anurag.kumar.vulisha@xilinx.com> X-Mailer: git-send-email 2.1.1 X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: IMSS-7.1.0.1224-8.2.0.1013-23620.005 X-TM-AS-User-Approved-Sender: Yes;Yes X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:149.199.60.83; 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Ip=[149.199.60.83]; Helo=[xsj-pvapsmtpgw01] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR02MB092 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP By default when core sees any transaction error(CRC or overflow) it replies with terminating retry ACK (Retry=1 and Nump == 0). Enabling this Auto Retry feature in controller, on seeing any transaction errors makes the core to send an non-terminating ACK transaction packet (that is, ACK TP with Retry=1 and Nump != 0). Doing so will give controller a chance to recover from the error condition. Signed-off-by: Anurag Kumar Vulisha --- Documentation/devicetree/bindings/usb/dwc3.txt | 5 +++++ drivers/usb/dwc3/core.c | 16 ++++++++++++++++ drivers/usb/dwc3/core.h | 6 ++++++ 3 files changed, 27 insertions(+) diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt index 7f13ebe..2ba2bc2 100644 --- a/Documentation/devicetree/bindings/usb/dwc3.txt +++ b/Documentation/devicetree/bindings/usb/dwc3.txt @@ -94,6 +94,11 @@ Optional properties: this and tx-thr-num-pkt-prd to a valid, non-zero value 1-16 (DWC_usb31 programming guide section 1.2.3) to enable periodic ESS TX threshold. + - snps,enable_auto_retry: Set to enable Auto retry Feature to make the + controller operating in Host mode on seeing transaction + errors(CRC errors or internal overrun scenerios) on IN + transfers to reply to the device with a non-terminating + retry ACK (i.e, an ACK TP with Retry=1 & Nump != 0) - tx-fifo-resize: determines if the FIFO *has* to be reallocated. diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 1038075..1c1ab93 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -883,6 +883,20 @@ static int dwc3_core_init(struct dwc3 *dwc) dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); } + if (dwc->autoretry_enable) { + reg = dwc3_readl(dwc->regs, DWC3_GUCTL); + + /* Enable Auto retry Feature to make the controller operating in + * Host mode on seeing transaction errors(CRC errors or internal + * overrun scenerios) on IN transfers to reply to the device + * with a non-terminating retry ACK (i.e, an ACK transcation + * packet with Retry=1 & Nump != 0) + */ + reg |= DWC3_GUCTL_HSTINAUTORETRY; + + dwc3_writel(dwc->regs, DWC3_GUCTL, reg); + } + /* * Must config both number of packets and max burst settings to enable * RX and/or TX threshold. @@ -1179,6 +1193,8 @@ static void dwc3_get_properties(struct dwc3 *dwc) dwc->dis_metastability_quirk = device_property_read_bool(dev, "snps,dis_metastability_quirk"); + dwc->autoretry_enable = device_property_read_bool(dev, + "snps,enable_auto_retry"); dwc->lpm_nyet_threshold = lpm_nyet_threshold; dwc->tx_de_emphasis = tx_de_emphasis; diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 285ce0e..558dfda 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -227,6 +227,9 @@ #define DWC3_GCTL_GBLHIBERNATIONEN BIT(1) #define DWC3_GCTL_DSBLCLKGTNG BIT(0) +/* Global User Control Register */ +#define DWC3_GUCTL_HSTINAUTORETRY BIT(14) + /* Global User Control 1 Register */ #define DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS BIT(28) #define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW BIT(24) @@ -984,6 +987,8 @@ struct dwc3_scratchpad_array { * 2 - No de-emphasis * 3 - Reserved * @dis_metastability_quirk: set to disable metastability quirk. + * @autoretry_enable: set to enable AutoRetry feature in controller to + * give an non terminating retry ACK (Retry=1 & Nump != 0) * @imod_interval: set the interrupt moderation interval in 250ns * increments or 0 to disable. */ @@ -1153,6 +1158,7 @@ struct dwc3 { unsigned tx_de_emphasis:2; unsigned dis_metastability_quirk:1; + unsigned autoretry_enable:1; u16 imod_interval; };