Re: [PATCH v4] usb/mtu3: power down device ip at setup

Chunfeng Yun
2018-11-29T06:26:14Z

hi Hsin-Yi,

On Thu, 2018-11-29 at 11:16 +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.
>
> Signed-off-by: Hsin-Yi, Wang <hsinyi@chromium.org>
> ---
> ChangeLog:
> V3->V4:
> *update comment
> ---
> drivers/usb/mtu3/mtu3_plat.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
> index 46551f6d16fd..e086630e41a9 100644
> --- a/drivers/usb/mtu3/mtu3_plat.c
> +++ b/drivers/usb/mtu3/mtu3_plat.c
> @@ -200,6 +200,14 @@ 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 may be powered on in firmware/BROM stage before entering
> + * kernel stage;
> + * power down device ip, otherwise ip-sleep will fail when working 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 */

Acked-by: Chunfeng Yun <chunfeng.yun@mediatek.com>

Thanks a lot