From: Chunfeng Yun <chunfeng.yun@mediatek.com>
To: "Hsin-Yi, Wang" <hsinyi@chromium.org>
Cc: <linux-arm-kernel@lists.infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
<linux-usb@vger.kernel.org>, <linux-mediatek@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [V2] usb/mtu3: power down device ip at setup
Date: Wed, 28 Nov 2018 17:41:09 +0800 [thread overview]
Message-ID: <1543398069.32173.112.camel@mhfsdcap03> (raw)
In-Reply-To: <20181128092953.41541-1-hsinyi@chromium.org>
Hi Hsin-Yi,
On Wed, 2018-11-28 at 17:29 +0800, Hsin-Yi, Wang wrote:
> Originally, when dr_mode is USB_DR_MODE_HOST, it didn't power down device ip,
> so host ip sleep will fail at ssusb_host_disable.
>
> Power down device ip at ssusb_host_setup.
need modify it, not in ssusb_host_setup now
>
>
> Signed-off-by: Hsin-Yi, Wang <hsinyi@chromium.org>
> ---
> drivers/usb/mtu3/mtu3_plat.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
> index 46551f6d16fd..cdef66141e20 100644
> --- a/drivers/usb/mtu3/mtu3_plat.c
> +++ b/drivers/usb/mtu3/mtu3_plat.c
> @@ -200,6 +200,12 @@ static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
> mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
> udelay(1);
> mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
> +
> + /*
> + * device ip is default power-on in fact
change as: device ip maybe poweron in LK/BROM stage before enter kernel
stage;
> + * power down device ip, otherwise ip-sleep will fail
power down device ip, otherwise ip-sleep will fail when works as host
only mode
> + */
> + mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
> }
>
> /* ignore the error if the clock does not exist */
Thanks a lot
next prev parent reply other threads:[~2018-11-28 9:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-28 6:04 [PATCH] usb/mtu3: power down device ip at setup Hsin-Yi, Wang
2018-11-28 6:22 ` Chunfeng Yun
2018-11-28 6:59 ` Hsin-Yi Wang
[not found] ` <CAJMQK-joY4M-=4+XoYAC5SJUie554i_EO=7VgrkJj2JNbbDdxg@mail.gmail.com>
2018-11-28 7:02 ` Chunfeng Yun
2018-11-28 9:29 ` [V2] " Hsin-Yi, Wang
2018-11-28 9:41 ` Chunfeng Yun [this message]
2018-11-28 9:53 ` [V3] " Hsin-Yi, Wang
2018-11-29 1:20 ` Nicolas Boichat
2018-11-29 3:16 ` [PATCH v4] " Hsin-Yi, Wang
2018-11-29 6:26 ` Chunfeng Yun
2018-11-29 7:50 ` Hsin-Yi Wang
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