From: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
To: Xing Zheng <zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Cc: linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
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Subject: Re: [RESEND PATCH v2] arm64: dts: rockchip: add u2phy clock for ehci and ohci of rk3399
Date: Tue, 27 Dec 2016 18:04:26 +0100 [thread overview]
Message-ID: <1731551.Q6cHK6n5ZM@phil> (raw)
In-Reply-To: <1482316865-2769-1-git-send-email-zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Am Mittwoch, 21. Dezember 2016, 18:41:05 CET schrieb Xing Zheng:
> From: William wu <wulf-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
>
> We found that the suspend process was blocked when it run into
> ehci/ohci module due to clk-480m of usb2-phy was disabled.
>
> The root cause is that usb2-phy suspended earlier than ehci/ohci
> (usb2-phy will be auto suspended if no devices plug-in). and the
> clk-480m provided by it was disabled if no module used. However,
> some suspend process related ehci/ohci are base on this clock,
> so we should refer it into ehci/ohci driver to prevent this case.
>
> The u2phy clock flow like this:
> ===
> u2phy ________________
>
> | | |-----> UTMI_CLK ---------> | EHCI |
>
> OSC_24M ---|---> PHY_PLL----|----|
>
> |________^_______| |-----> 480M_CLK ---|G|---> |
> |USBPHY_480M_SRC| ----> USBPHY_480M for SoC
> GRF
> ===
>
> Signed-off-by: William wu <wulf-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
> Signed-off-by: Xing Zheng <zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
applied for 4.11 with Doug's Review-tag
Thanks
Heiko
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prev parent reply other threads:[~2016-12-27 17:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-21 10:29 [PATCH v2] arm64: dts: rockchip: add u2phy clock for ehci and ohci of rk3399 Xing Zheng
[not found] ` <1482316182-2305-1-git-send-email-zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-12-21 10:41 ` [RESEND PATCH " Xing Zheng
[not found] ` <1482316865-2769-1-git-send-email-zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-12-22 0:47 ` Doug Anderson
[not found] ` <CAD=FV=WFFGSc7yBeaE+++VAuRKwMixpGUwA9bCCro4TCe0+GAA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-12-22 1:15 ` Xing Zheng
2016-12-22 13:54 ` wlf
2016-12-27 17:04 ` Heiko Stuebner [this message]
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