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

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Message-ID: <2f8d6e4e-ba01-4a87-94d6-65421db765ed@collabora.com>
Date: Mon, 22 Jan 2024 12:00:07 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Matthias Brugger <matthias.bgg@...il.com>, chunfeng.yun@...iatek.com
Cc: gregkh@...uxfoundation.org, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 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, kernel@...labora.com
Subject: Re: [PATCH 2/2] usb: mtu3: Add MT8195 MTU3 ip-sleep wakeup support

Il 22/01/24 08:58, Matthias Brugger ha scritto:
> 
> 
> On 12/01/2024 14:32, 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>
>> ---
>>   drivers/usb/mtu3/mtu3_host.c | 31 +++++++++++++++++++++++++++++++
>>   1 file changed, 31 insertions(+)
>>
>> diff --git a/drivers/usb/mtu3/mtu3_host.c b/drivers/usb/mtu3/mtu3_host.c
>> index 9f2be22af844..85f49e00e8db 100644
>> --- a/drivers/usb/mtu3/mtu3_host.c
>> +++ b/drivers/usb/mtu3/mtu3_host.c
>> @@ -34,6 +34,19 @@
>>   #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)
> 
> Not used, shouldn't we drop that?
> 

Hey Matthias!

Thanks for catching that - yeah that bit exists, but cannot be used in MTU3, so
it has to be dropped.

Sending a v2 in a jiffy....... or two. :-)

Cheers,
Angelo

> Regards,
> Matthias
> 
>> +
>> +#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 +57,9 @@ 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 +86,21 @@ 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;