linux-kernel - Re: [PATCH v2 2/2] usb: mtu3: Add MT8195 MTU3 ip-sleep wakeup support

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Message-ID: <0f96aac2ee16c31808f22853fdf746678f5284e8.camel@mediatek.com>
Date: Sun, 4 Feb 2024 06:03:18 +0000
From: Chunfeng Yun (云春峰) <Chunfeng.Yun@...iatek.com>
To: "angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
CC: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>, "linux-usb@...r.kernel.org"
	<linux-usb@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "conor.dooley@...rochip.com"
	<conor.dooley@...rochip.com>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "gregkh@...uxfoundation.org"
	<gregkh@...uxfoundation.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>
Subject: Re: [PATCH v2 2/2] usb: mtu3: Add MT8195 MTU3 ip-sleep wakeup support

On Mon, 2024-01-22 at 12:18 +0100, AngeloGioacchino Del Regno wrote:
> Add support for the ip-sleep wakeup functionality on the three MTU3
> controllers found on the MT8195 SoC.
> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
> 
> Changes in v2:
>  - Dropped unused definition for WC0_IS_EN_P1_95
> 
>  drivers/usb/mtu3/mtu3_host.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/usb/mtu3/mtu3_host.c
> b/drivers/usb/mtu3/mtu3_host.c
> index 9f2be22af844..7c657ea2dabd 100644
> --- a/drivers/usb/mtu3/mtu3_host.c
> +++ b/drivers/usb/mtu3/mtu3_host.c
> @@ -34,6 +34,18 @@
>  #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 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)
> @@ -44,6 +56,9 @@ enum ssusb_uwk_vers {
>  	SSUSB_UWK_V2,
>  	SSUSB_UWK_V1_1 = 101,	/* specific revision 1.01 */
>  	SSUSB_UWK_V1_2,		/* specific revision 1.02 */
> +	SSUSB_UWK_V1_3,		/* mt8195 IP0 */
> +	SSUSB_UWK_V1_5 = 105,	/* mt8195 IP2 */
> +	SSUSB_UWK_V1_6,		/* mt8195 IP3 */
>  };
>  
>  /*
> @@ -70,6 +85,21 @@ static void ssusb_wakeup_ip_sleep_set(struct
> ssusb_mtk *ssusb, bool enable)
>  		msk = WC0_SSUSB0_CDEN | WC0_IS_SPM_EN;
>  		val = enable ? msk : 0;
>  		break;
> +	case SSUSB_UWK_V1_3:
> +		reg = ssusb->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_5:
> +		reg = ssusb->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 = ssusb->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 = ssusb->uwk_reg_base + PERI_SSUSB_SPM_CTRL;
>  		msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN;

which project will use ip-sleep wakeup for mt8195? only use device
mode?

As I know, when use upstream code to support dual-role mode on mt8195,
there is a bug caused by hw limitation;