linux-kernel - Re: [PATCH v2 6/7] usb: cdns3-ti: signal reset-on-resume to xHCI for J7200 platform

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Date:   Tue, 21 Nov 2023 18:53:28 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Théo Lebrun <theo.lebrun@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Peter Chen <peter.chen@...nel.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Grégory Clement <gregory.clement@...tlin.com>
Subject: Re: [PATCH v2 6/7] usb: cdns3-ti: signal reset-on-resume to xHCI for
 J7200 platform



On 20/11/2023 19:06, Théo Lebrun wrote:
> Pass CDNS3_RESET_ON_RESUME as platform data to cdns3 host role. It will
> in turn pass it down to xHCI platform data as XHCI_RESET_ON_RESUME.
> 
> Avoid this warning on resume:
> 
>   [   16.017462] xhci-hcd xhci-hcd.1.auto: xHC error in resume, USBSTS 0x401, Reinit
> 
> When used, remote wakeup is not expected to work.
> 
> Only focus J7200 as other SoC are untested.
> 
> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> ---
>  drivers/usb/cdns3/cdns3-ti.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
> index 84f93c2fcd5c..7d56a1acbc54 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
> @@ -128,6 +129,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct device_node *node = pdev->dev.of_node;
> +	const struct of_dev_auxdata *auxdata;
>  	struct cdns_ti *data;
>  	unsigned long rate;
>  	int error, i;
> @@ -177,7 +179,8 @@ static int cdns_ti_probe(struct platform_device *pdev)
>  
>  	cdns_ti_init_hw(data);
>  
> -	error = of_platform_populate(node, NULL, NULL, dev);
> +	auxdata = of_device_get_match_data(dev);
> +	error = of_platform_populate(node, NULL, auxdata, dev);
>  	if (error) {
>  		dev_err(dev, "failed to create children: %d\n", error);
>  		return error;
> @@ -222,8 +225,20 @@ static const struct dev_pm_ops cdns_ti_pm_ops = {
>  
>  #endif /* CONFIG_PM */
>  
> +static struct cdns3_platform_data cdns_ti_j7200_pdata = {
> +	.quirks = CDNS3_RESET_ON_RESUME,
> +};

We will need to introduce a new data structure "struct cdns_ti_platform_data"
and add platform specific details like "reset_on_resume" to it.
This is to address what Krzysztof pointed to in patch 4.

> +
> +static const struct of_dev_auxdata cdns_ti_j7200_auxdata[] = {
> +	{
> +		.compatible = "cdns,usb3",
> +		.platform_data = &cdns_ti_j7200_pdata,
> +	},
> +	{},
> +};
> +
>  static const struct of_device_id cdns_ti_of_match[] = {
> -	{ .compatible = "ti,j7200-usb", },
> +	{ .compatible = "ti,j7200-usb", .data = cdns_ti_j7200_auxdata, },

Here we should pass "struct cdns_ti_platform_data"

>  	{ .compatible = "ti,j721e-usb", },
>  	{ .compatible = "ti,am64-usb", },
>  	{},
> 

-- 
cheers,
-roger