linux-kernel - Re: [PATCH v3 2/2] usb: cdns3-ti: Add workaround for Errata i2409

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Date: Fri, 17 May 2024 10:21:04 +0800
From: Peter Chen <peter.chen@...nel.org>
To: Ravi Gunasekaran <r-gunasekaran@...com>
Cc: pawell@...ence.com, rogerq@...nel.org, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, srk@...com
Subject: Re: [PATCH v3 2/2] usb: cdns3-ti: Add workaround for Errata i2409

On 24-05-16 10:15:37, Ravi Gunasekaran wrote:
> From: Roger Quadros <rogerq@...nel.org>
> 
> TI USB2 PHY is known to have a lockup issue on very short
> suspend intervals. Enable the Suspend Residency quirk flag to
> workaround this as described in Errata i2409 [1].
> 
> [1] - https://www.ti.com/lit/er/sprz457h/sprz457h.pdf
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
> ---
> Change log:
> ----------
> Changes since v2:
> ----------------
> * No change
> 
> Changes since v1:
> ----------------
> * No change
> 
> v2: https://lore.kernel.org/all/20240516042845.31211-1-r-gunasekaran@ti.com/
> v1: https://lore.kernel.org/all/20240514092421.20897-1-r-gunasekaran@ti.com/#t
> 
>  drivers/usb/cdns3/cdns3-ti.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
> index 5945c4b1e11f..cfabc12ee0e3 100644
> --- a/drivers/usb/cdns3/cdns3-ti.c
> +++ b/drivers/usb/cdns3/cdns3-ti.c
> @@ -16,6 +16,7 @@
>  #include <linux/of_platform.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/property.h>
> +#include "core.h"
>  
>  /* USB Wrapper register offsets */
>  #define USBSS_PID		0x0
> @@ -85,6 +86,18 @@ static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value)
>  	writel(value, data->usbss + offset);
>  }
>  
> +static struct cdns3_platform_data cdns_ti_pdata = {
> +	.quirks = CDNS3_DRD_SUSPEND_RESIDENCY_ENABLE,   /* Errata i2409 */
> +};
> +
> +static const struct of_dev_auxdata cdns_ti_auxdata[] = {
> +	{
> +		.compatible = "cdns,usb3",
> +		.platform_data = &cdns_ti_pdata,
> +	},
> +	{},
> +};
> +
>  static int cdns_ti_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -176,7 +189,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
>  	reg |= USBSS_W1_PWRUP_RST;
>  	cdns_ti_writel(data, USBSS_W1, reg);
>  
> -	error = of_platform_populate(node, NULL, NULL, dev);
> +	error = of_platform_populate(node, NULL, cdns_ti_auxdata, dev);
>  	if (error) {
>  		dev_err(dev, "failed to create children: %d\n", error);
>  		goto err;
> -- 
> 2.17.1
> 

Acked-by: Peter Chen <peter.chen@...nel.org>

-- 

Thanks,
Peter Chen