linux-kernel - Re: [PATCH v3 10/13] phy: tegra: xusb: Disable trk clk when not in use

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Date:   Tue, 15 Nov 2022 12:19:23 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Wayne Chang <waynec@...dia.com>, gregkh@...uxfoundation.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        treding@...dia.com, thierry.reding@...il.com,
        heikki.krogerus@...ux.intel.com, ajayg@...dia.com,
        vkoul@...nel.org, p.zabel@...gutronix.de, balbi@...nel.org,
        mathias.nyman@...el.com, jckuo@...dia.com
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, singhanc@...dia.com,
        linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v3 10/13] phy: tegra: xusb: Disable trk clk when not in
 use



On 14/11/2022 12:40, Wayne Chang wrote:
> Pad tracking is a one-time calibration for Tegra186 and Tegra194.
> Clk should be disabled after calibration.
> 
> Disable clk after calibration.
> While at it add 100us delay for HW recording the calibration value.
> 
> Signed-off-by: Wayne Chang <waynec@...dia.com>
> ---
> V2 -> V3:nothing has changed
> V1 -> V2:update the commit message.
>   drivers/phy/tegra/xusb-tegra186.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
> index 0996ede63387..f121b4ffbbfd 100644
> --- a/drivers/phy/tegra/xusb-tegra186.c
> +++ b/drivers/phy/tegra/xusb-tegra186.c
> @@ -609,6 +609,10 @@ static void tegra186_utmi_bias_pad_power_on(struct tegra_xusb_padctl *padctl)
>   	value &= ~USB2_PD_TRK;
>   	padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
>   
> +	udelay(100);
> +
> +	clk_disable_unprepare(priv->usb2_trk_clk);
> +
>   	mutex_unlock(&padctl->lock);
>   }
>   
> @@ -633,8 +637,6 @@ static void tegra186_utmi_bias_pad_power_off(struct tegra_xusb_padctl *padctl)
>   	value |= USB2_PD_TRK;
>   	padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
>   
> -	clk_disable_unprepare(priv->usb2_trk_clk);
> -
>   	mutex_unlock(&padctl->lock);
>   }
>   


Reviewed-by: Jon Hunter <jonathanh@...dia.com>

Thanks
Jon

-- 
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