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Tue, 20 Sep 2022 00:23:08 -0500 From: Piyush Mehta To: , , , , CC: , , , , , Piyush Mehta Subject: [PATCH V3 2/2] usb: dwc3: core: Enable GUCTL1 bit 10 for fixing termination error after resume bug Date: Tue, 20 Sep 2022 10:52:35 +0530 Message-ID: <20220920052235.194272-3-piyush.mehta@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220920052235.194272-1-piyush.mehta@amd.com> References: <20220920052235.194272-1-piyush.mehta@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT054:EE_|BY5PR12MB5015:EE_ X-MS-Office365-Filtering-Correlation-Id: 035c3baf-3c28-43ce-ea5d-08da9ac8372c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: ExIIJFZYmqB7OdL2yy3Gso7QztqJuTjYu+7nY7wpLOY3JryJIEgZXy12ZN1odITDhlgqO9iCpP1LkpSpcQf7/osJob225X0EFoRihP5gdwViBpUMAc4GBVoTAlOPaO+caCjvvvPNsnZAYmbS3ovsj1ohKs7bQpGeEmziiAZB6z1tPo9D66/R6xHGTSEc/k+HAW9J7Qu/ZITf6zKEwJwC24KA3gPYN0k1MinM9ieRIvWuRMRgpecwsytQgt9V9M5Y9qHQzB2R5h7Pd/koyF2nyy8UsRlHYHXSvl8q+MyJV51P+KhXVt61be8/Ng9pqZ1lVTPovPokwq6g6Dgmxd36P4KvmkWne+hcG05W10HQZRSdhDqTATg28niu7JCTSzi2hMC51NZ9RnzQabD2u7vMKidoJpPUv60nYsJDHJauM+wo0hYNLac5V4Edd1os6lLsYOPiEU5/UhjHl75nBDLCDOMl+I+bqJajV3/ih3bz9mfFpQqYS/TTi8Ai9AvCZbs32rC8KjiIZhMqGo4qWocBoB6RKGao8bmkjNm528ezWRVyY0tk7WgoVbZ1l9CFkWsccwxAiD/xWgCQDAfybTzxrAD8oAOVbjjOOidRFEL1hoTZVqJPq18ZUkToP7PytClaL4h7jRoyRLdTXcGkZ1iopTyENmaPwarR8L/sFHffhRea9F4y1IIXpQrRADr+PiLeWjnnkno+nNjTeWLqeOwp/E9XKu/j0adlPiWJ6iLcMb3XZC0/XHsj9zgwbA7Ggj99gagPR8S6AhTH20pvs/s7f9Uq95rToLQumSrD6JwE+9FP0iMmuxLwggAl290TOetF X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230022)(4636009)(376002)(396003)(136003)(346002)(39860400002)(451199015)(36840700001)(40470700004)(46966006)(70206006)(47076005)(44832011)(5660300002)(2906002)(426003)(83380400001)(40460700003)(41300700001)(110136005)(316002)(82310400005)(70586007)(186003)(8676002)(82740400003)(2616005)(1076003)(36756003)(8936002)(81166007)(356005)(26005)(478600001)(36860700001)(336012)(86362001)(54906003)(6666004)(40480700001)(4326008)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Sep 2022 05:23:13.5079 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 035c3baf-3c28-43ce-ea5d-08da9ac8372c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT054.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB5015 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When configured in HOST mode, after issuing U3/L2 exit controller fails to send proper CRC checksum in CRC5 field. Because of this behavior Transaction Error is generated, resulting in reset and re-enumeration of usb device attached. Enabling chicken bit 10 of GUCTL1 will correct this problem. When this bit is set to '1', the UTMI/ULPI opmode will be changed to "normal" along with HS terminations, term, and xcvr signals after EOR. This option is to support certain legacy UTMI/ULPI PHYs. Added "snps,resume-hs-terminations" quirk to resolved the above issue. Signed-off-by: Piyush Mehta --- drivers/usb/dwc3/core.c | 17 +++++++++++++++++ drivers/usb/dwc3/core.h | 4 ++++ 2 files changed, 21 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 8c8e32651473..7223074be6be 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1180,6 +1180,21 @@ static int dwc3_core_init(struct dwc3 *dwc) dwc3_writel(dwc->regs, DWC3_GUCTL2, reg); } + /* + * When configured in HOST mode, after issuing U3/L2 exit controller + * fails to send proper CRC checksum in CRC5 feild. Because of this + * behaviour Transaction Error is generated, resulting in reset and + * re-enumeration of usb device attached. All the termsel, xcvrsel, + * opmode becomes 0 during end of resume. Enabling bit 10 of GUCTL1 + * will correct this problem. This option is to support certain + * legacy ULPI PHYs. + */ + if (dwc->resume_hs_terminations) { + reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); + reg |= DWC3_GUCTL1_RESUME_OPMODE_HS_HOST; + dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); + } + if (!DWC3_VER_IS_PRIOR(DWC3, 250A)) { reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); @@ -1523,6 +1538,8 @@ static void dwc3_get_properties(struct dwc3 *dwc) "snps,dis-del-phy-power-chg-quirk"); dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev, "snps,dis-tx-ipgap-linecheck-quirk"); + dwc->resume_hs_terminations = device_property_read_bool(dev, + "snps,resume-hs-terminations"); dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev, "snps,parkmode-disable-ss-quirk"); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 4fe4287dc934..bc5ac4d0d61f 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -263,6 +263,7 @@ #define DWC3_GUCTL1_DEV_FORCE_20_CLK_FOR_30_CLK BIT(26) #define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW BIT(24) #define DWC3_GUCTL1_PARKMODE_DISABLE_SS BIT(17) +#define DWC3_GUCTL1_RESUME_OPMODE_HS_HOST BIT(10) /* Global Status Register */ #define DWC3_GSTS_OTG_IP BIT(10) @@ -1096,6 +1097,8 @@ struct dwc3_scratchpad_array { * change quirk. * @dis_tx_ipgap_linecheck_quirk: set if we disable u2mac linestate * check during HS transmit. + * @resume-hs-terminations: Set if we enable quirk for fixing improper crc + * generation after resume from suspend. * @parkmode_disable_ss_quirk: set if we need to disable all SuperSpeed * instances in park mode. * @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk @@ -1311,6 +1314,7 @@ struct dwc3 { unsigned dis_u2_freeclk_exists_quirk:1; unsigned dis_del_phy_power_chg_quirk:1; unsigned dis_tx_ipgap_linecheck_quirk:1; + unsigned resume_hs_terminations:1; unsigned parkmode_disable_ss_quirk:1; unsigned tx_de_emphasis_quirk:1; -- 2.25.1