linux-kernel - Re: [PATCH v2 1/2] usb: cdns3: Add quirk flag to enable suspend residency

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Message-ID: <a5a4db25-01a6-eec0-53fe-166029f71aec@ti.com>
Date: Thu, 16 May 2024 10:05:01 +0530
From: Ravi Gunasekaran <r-gunasekaran@...com>
To: <peter.chen@...nel.org>, <pawell@...ence.com>, <rogerq@...nel.org>
CC: <gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <srk@...com>,
        Ravi Gunasekaran
	<r-gunasekaran@...com>
Subject: Re: [PATCH v2 1/2] usb: cdns3: Add quirk flag to enable suspend
 residency



On 5/16/24 9:58 AM, Ravi Gunasekaran wrote:
> From: Roger Quadros <rogerq@...nel.org>
> 
> Some platforms (e.g. ti,j721e-usb, ti,am64-usb) require
> this bit to be set to workaround a lockup issue with PHY
> short suspend intervals [1]. Add a platform quirk flag
> to indicate if Suspend Residency should be enabled.
> 
> [1] - https://www.ti.com/lit/er/sprz457h/sprz457h.pdf
> i2409 - USB: USB2 PHY locks up due to short suspend
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
> ---
> Change log:
> ----------
> 
> Changes since v1:
> ----------------
> * Grouped the susp_ctrl register update along with
>   existing CDNS3 snippet as suggested by Peter Chen
> 
> v1: https://lore.kernel.org/all/20240514092421.20897-1-r-gunasekaran@ti.com/#t

[...]

> -	u32 state;
> +	u32 state, reg;
>  	int ret;
>  
>  	regs = devm_ioremap_resource(cdns->dev, &cdns->otg_res);
> @@ -433,12 +433,21 @@ int cdns_drd_init(struct cdns *cdns)
>  			cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)
>  					      &cdns->otg_v1_regs->ien;
>  			writel(1, &cdns->otg_v1_regs->simulate);
> +
> +			if (cdns->pdata &&
> +			    (cdns->pdata->quirks & CDNS3_DRD_SUSPEND_RESIDENCY_ENABLE)) {
> +				reg = readl(&cdns->otg_v1_regs->susp_ctrl);
> +				reg |= SUSP_CTRL_SUSPEND_RESIDENCY_ENABLE;
> +				writel(reg, &cdns->otg_v1_regs->susp_ctrl);
> +			}
> +
>  			cdns->version  = CDNS3_CONTROLLER_V1;
>  		} else {
>  			dev_err(cdns->dev, "not supported DID=0x%08x\n", state);
>  			return -EINVAL;
>  		}
>  
> +

Please ignore this patch. I didn't notice this.
I will send a v3 fixing it.


>  		dev_dbg(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n",
>  			 readl(&cdns->otg_v1_regs->did),
>  			 readl(&cdns->otg_v1_regs->rid));
> diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h
> index d72370c321d3..1e2aee14d629 100644
> --- a/drivers/usb/cdns3/drd.h
> +++ b/drivers/usb/cdns3/drd.h
> @@ -193,6 +193,9 @@ struct cdns_otg_irq_regs {
>  /* OTGREFCLK - bitmasks */
>  #define OTGREFCLK_STB_CLK_SWITCH_EN	BIT(31)
>  
> +/* SUPS_CTRL - bitmasks */
> +#define SUSP_CTRL_SUSPEND_RESIDENCY_ENABLE	BIT(17)
> +
>  /* OVERRIDE - bitmasks */
>  #define OVERRIDE_IDPULLUP		BIT(0)
>  /* Only for CDNS3_CONTROLLER_V0 version */

-- 
Regards,
Ravi