linux-kernel - Re: [PATCH 2/3] usb: xhci-mtk: add support ip-sleep wakeup for mt8195

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Message-ID: <138878d2-e346-931b-69ee-54277fa5647b@gmail.com>
Date:   Wed, 17 Nov 2021 16:39:40 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] usb: xhci-mtk: add support ip-sleep wakeup for mt8195



On 02/11/2021 07:00, Chunfeng Yun wrote:
> Add support ip-sleep wakeup for mt8195, it's a specific revision for
> each USB controller, and not following IPM rule.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
>   drivers/usb/host/xhci-mtk.c | 37 +++++++++++++++++++++++++++++++++++++
>   1 file changed, 37 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
> index c53f6f276d5c..63f4b6984667 100644
> --- a/drivers/usb/host/xhci-mtk.c
> +++ b/drivers/usb/host/xhci-mtk.c
> @@ -95,6 +95,19 @@
>   #define WC0_SSUSB0_CDEN		BIT(6)
>   #define WC0_IS_SPM_EN		BIT(1)
>   
> +/* mt8195 */
> +#define PERI_WK_CTRL0_8195	0x04
> +#define WC0_IS_P_95		BIT(30)	/* polarity */
> +#define WC0_IS_C_95(x)		((u32)(((x) & 0x7) << 27))
> +#define WC0_IS_EN_P3_95		BIT(26)
> +#define WC0_IS_EN_P2_95		BIT(25)
> +#define WC0_IS_EN_P1_95		BIT(24)
> +
> +#define PERI_WK_CTRL1_8195	0x20
> +#define WC1_IS_C_95(x)		((u32)(((x) & 0xf) << 28))
> +#define WC1_IS_P_95		BIT(12)
> +#define WC1_IS_EN_P0_95		BIT(6)
> +
>   /* mt2712 etc */
>   #define PERI_SSUSB_SPM_CTRL	0x0
>   #define SSC_IP_SLEEP_EN	BIT(4)
> @@ -105,6 +118,10 @@ enum ssusb_uwk_vers {
>   	SSUSB_UWK_V2,
>   	SSUSB_UWK_V1_1 = 101,	/* specific revision 1.01 */
>   	SSUSB_UWK_V1_2,		/* specific revision 1.2 */
> +	SSUSB_UWK_V1_3,		/* mt8195 IP0 */
> +	SSUSB_UWK_V1_4,		/* mt8195 IP1 */
> +	SSUSB_UWK_V1_5,		/* mt8195 IP2 */
> +	SSUSB_UWK_V1_6,		/* mt8195 IP3 */
>   };
>   
>   /*
> @@ -307,6 +324,26 @@ static void usb_wakeup_ip_sleep_set(struct xhci_hcd_mtk *mtk, bool enable)
>   		msk = WC0_SSUSB0_CDEN | WC0_IS_SPM_EN;
>   		val = enable ? msk : 0;
>   		break;
> +	case SSUSB_UWK_V1_3:
> +		reg = mtk->uwk_reg_base + PERI_WK_CTRL1_8195;
> +		msk = WC1_IS_EN_P0_95 | WC1_IS_C_95(0xf) | WC1_IS_P_95;
> +		val = enable ? (WC1_IS_EN_P0_95 | WC1_IS_C_95(0x1)) : 0;
> +		break;
> +	case SSUSB_UWK_V1_4:
> +		reg = mtk->uwk_reg_base + PERI_WK_CTRL0_8195;
> +		msk = WC0_IS_EN_P1_95 | WC0_IS_C_95(0x7) | WC0_IS_P_95;
> +		val = enable ? (WC0_IS_EN_P1_95 | WC0_IS_C_95(0x1)) : 0;
> +		break;
> +	case SSUSB_UWK_V1_5:
> +		reg = mtk->uwk_reg_base + PERI_WK_CTRL0_8195;
> +		msk = WC0_IS_EN_P2_95 | WC0_IS_C_95(0x7) | WC0_IS_P_95;
> +		val = enable ? (WC0_IS_EN_P2_95 | WC0_IS_C_95(0x1)) : 0;
> +		break;
> +	case SSUSB_UWK_V1_6:
> +		reg = mtk->uwk_reg_base + PERI_WK_CTRL0_8195;
> +		msk = WC0_IS_EN_P3_95 | WC0_IS_C_95(0x7) | WC0_IS_P_95;
> +		val = enable ? (WC0_IS_EN_P3_95 | WC0_IS_C_95(0x1)) : 0;
> +		break;
>   	case SSUSB_UWK_V2:
>   		reg = mtk->uwk_reg_base + PERI_SSUSB_SPM_CTRL;
>   		msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN;
>