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Fri, 27 May 2022 09:16:20 +0000 From: Li Jun To: gregkh@linuxfoundation.org, balbi@kernel.org Cc: linux-usb@vger.kernel.org, Thinh.Nguyen@synopsys.com, jindong.yue@nxp.com Subject: [PATCH] usb: dwc3: add power down scale setting Date: Fri, 27 May 2022 17:03:15 +0800 Message-Id: <1653642195-23889-1-git-send-email-jun.li@nxp.com> X-Mailer: git-send-email 2.7.4 X-ClientProxiedBy: SI2PR04CA0008.apcprd04.prod.outlook.com (2603:1096:4:197::20) To PA4PR04MB9640.eurprd04.prod.outlook.com (2603:10a6:102:261::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5d2f8e05-7618-45ba-2188-08da3fc18fbe X-MS-TrafficTypeDiagnostic: DB8PR04MB7161:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PA4PR04MB9640.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(2616005)(6666004)(83380400001)(186003)(5660300002)(66476007)(38350700002)(38100700002)(316002)(86362001)(6506007)(8936002)(36756003)(6486002)(508600001)(26005)(6512007)(8676002)(66946007)(52116002)(4326008)(66556008)(2906002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5d2f8e05-7618-45ba-2188-08da3fc18fbe X-MS-Exchange-CrossTenant-AuthSource: PA4PR04MB9640.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 May 2022 09:16:20.1530 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: FhlGPVPwsL1ATEbFucyQQdMl/nc6S4KaDZlxmaO3NT1mBtwpqklJmx2LPjONRAye X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR04MB7161 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Some SoC(e.g NXP imx8MQ) may have a wrong default power down scale setting so need init it to be the correct value, the power down scale setting description in DWC3 databook: Power Down Scale (PwrDnScale) The USB3 suspend_clk input replaces pipe3_rx_pclk as a clock source to a small part of the USB3 core that operates when the SS PHY is in its lowest power (P3) state, and therefore does not provide a clock. The Power Down Scale field specifies how many suspend_clk periods fit into a 16 kHz clock period. When performing the division, round up the remainder. For example, when using an 8-bit/16-bit/32-bit PHY and 25-MHz Suspend clock, Power Down Scale = 25000 kHz/16 kHz = 13'd1563 (rounder up) So use the suspend clock rate to calculate it. Signed-off-by: Li Jun --- drivers/usb/dwc3/core.c | 22 ++++++++++++++++++++++ drivers/usb/dwc3/core.h | 1 + 2 files changed, 23 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index e027c0420dc3..16d441dbc28b 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1029,6 +1029,25 @@ static void dwc3_set_incr_burst_type(struct dwc3 *dwc) dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg); } +static void dwc3_set_power_down_clk_scale(struct dwc3 *dwc) +{ + u32 reg, scale; + + if (!dwc->susp_clk) + return; + + /* + * The power down scale field specifies how many suspend_clk + * periods fit into a 16KHz clock period. When performing + * the division, round up the remainder. + */ + scale = DIV_ROUND_UP(clk_get_rate(dwc->susp_clk), 16384); + reg = dwc3_readl(dwc->regs, DWC3_GCTL); + reg &= ~(DWC3_GCTL_PWRDNSCALE_MASK); + reg |= DWC3_GCTL_PWRDNSCALE(scale); + dwc3_writel(dwc->regs, DWC3_GCTL, reg); +} + /** * dwc3_core_init - Low-level initialization of DWC3 Core * @dwc: Pointer to our controller context structure @@ -1105,6 +1124,9 @@ static int dwc3_core_init(struct dwc3 *dwc) if (ret) goto err1; + /* Set power down scale of suspend_clk */ + dwc3_set_power_down_clk_scale(dwc); + /* Adjust Frame Length */ dwc3_frame_length_adjustment(dwc); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 81c486b3941c..722808d8c0af 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -231,6 +231,7 @@ /* Global Configuration Register */ #define DWC3_GCTL_PWRDNSCALE(n) ((n) << 19) +#define DWC3_GCTL_PWRDNSCALE_MASK GENMASK(31, 19) #define DWC3_GCTL_U2RSTECN BIT(16) #define DWC3_GCTL_RAMCLKSEL(x) (((x) & DWC3_GCTL_CLK_MASK) << 6) #define DWC3_GCTL_CLK_BUS (0)