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Message-ID: <d84e400d-7f76-4b4d-8960-f1338f37b8ac@linaro.org>
Date:   Mon, 20 Nov 2023 18:31:36 +0100
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Subject: Re: [PATCH v2 4/7] usb: cdns3-ti: add suspend/resume procedures for
 J7200
Content-Language: en-US
To:     =?UTF-8?Q?Th=C3=A9o_Lebrun?= <theo.lebrun@bootlin.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Roger Quadros <rogerq@kernel.org>,
        Peter Chen <peter.chen@kernel.org>,
        Pawel Laszczak <pawell@cadence.com>,
        Nishanth Menon <nm@ti.com>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Tero Kristo <kristo@kernel.org>
Cc:     linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        =?UTF-8?Q?Gr=C3=A9gory_Clement?= <gregory.clement@bootlin.com>
References: <20231120-j7200-usb-suspend-v2-0-038c7e4a3df4@bootlin.com>
 <20231120-j7200-usb-suspend-v2-4-038c7e4a3df4@bootlin.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20231120-j7200-usb-suspend-v2-4-038c7e4a3df4@bootlin.com>
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Precedence: bulk

On 20/11/2023 18:06, Théo Lebrun wrote:
> Hardware initialisation is only done at probe. The J7200 USB controller
> is reset at resume because of power-domains toggling off & on. We
> therefore reconfigure the hardware at resume.
> 
> Reuse the newly extracted cdns_ti_init_hw() function that contains the
> register write sequence.
> 
> Only focus J7200 as other SoC are untested. If the controller does not
> reset we do not want to redo reg writes.
> 
> Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
> ---
>  drivers/usb/cdns3/cdns3-ti.c | 24 +++++++++++++++++++++++-
>  1 file changed, 23 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
> index d4232b440e4e..84f93c2fcd5c 100644
> --- a/drivers/usb/cdns3/cdns3-ti.c
> +++ b/drivers/usb/cdns3/cdns3-ti.c
> @@ -58,6 +58,7 @@ struct cdns_ti {
>  	struct clk *usb2_refclk;
>  	struct clk *lpm_clk;
>  	int usb2_refclk_rate_code;
> +	bool reset_on_resume;
>  };
>  
>  static const int cdns_ti_rate_table[] = {	/* in KHZ */
> @@ -172,6 +173,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
>  	data->usb2_refclk_rate_code = i;
>  	data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");
>  	data->usb2_only = device_property_read_bool(dev, "ti,usb2-only");
> +	data->reset_on_resume = of_device_is_compatible(node, "ti,j7200-usb");

No, use driver data for this. Don't put compatibles in the code. It
makes it unmanageable soon.

I am repeating this issue from time to time :/

Best regards,
Krzysztof