linux-kernel - Re: [PATCH] usb: typec: tcpci_mt6360: Update for BMC PHY setting

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Message-ID: <514da5d6-9044-181f-bdd1-84b5b9abd346@roeck-us.net>
Date:   Mon, 9 May 2022 20:36:19 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     cy_huang <u0084500@...il.com>, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org, matthias.bgg@...il.com
Cc:     cy_huang@...htek.com, bryan_huang@...htek.com,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: typec: tcpci_mt6360: Update for BMC PHY setting

On 5/9/22 18:44, cy_huang wrote:
> From: ChiYuan Huang <cy_huang@...htek.com>
> 
> Update MT6360 BMC PHY Tx/Rx setting for the compatibility.
> 
> Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> ---
> Hi,
> 
> Recently, there's some USBPD MT6360 IOP issue from the user.
>>>From our RD's comment, BMC PHY Tx/Rx setting need to be updated for
> the compatibility issue.

I think this needs to be a bit more detailed. What compatibility issue ?
Compatibility with what ?

Thanks,
Guenter

> ---
>   drivers/usb/typec/tcpm/tcpci_mt6360.c | 26 ++++++++++++++++++++++++++
>   1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpci_mt6360.c b/drivers/usb/typec/tcpm/tcpci_mt6360.c
> index f1bd9e0..8a952ea 100644
> --- a/drivers/usb/typec/tcpm/tcpci_mt6360.c
> +++ b/drivers/usb/typec/tcpm/tcpci_mt6360.c
> @@ -15,6 +15,9 @@
>   
>   #include "tcpci.h"
>   
> +#define MT6360_REG_PHYCTRL1	0x80
> +#define MT6360_REG_PHYCTRL3	0x82
> +#define MT6360_REG_PHYCTRL7	0x86
>   #define MT6360_REG_VCONNCTRL1	0x8C
>   #define MT6360_REG_MODECTRL2	0x8F
>   #define MT6360_REG_SWRESET	0xA0
> @@ -22,6 +25,8 @@
>   #define MT6360_REG_DRPCTRL1	0xA2
>   #define MT6360_REG_DRPCTRL2	0xA3
>   #define MT6360_REG_I2CTORST	0xBF
> +#define MT6360_REG_PHYCTRL11	0xCA
> +#define MT6360_REG_RXCTRL1	0xCE
>   #define MT6360_REG_RXCTRL2	0xCF
>   #define MT6360_REG_CTDCTRL2	0xEC
>   
> @@ -106,6 +111,27 @@ static int mt6360_tcpc_init(struct tcpci *tcpci, struct tcpci_data *tdata)
>   	if (ret)
>   		return ret;
>   
> +	/* BMC PHY */
> +	ret = mt6360_tcpc_write16(regmap, MT6360_REG_PHYCTRL1, 0x3A70);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_write(regmap, MT6360_REG_PHYCTRL3,  0x82);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_write(regmap, MT6360_REG_PHYCTRL7, 0x36);
> +	if (ret)
> +		return ret;
> +
> +	ret = mt6360_tcpc_write16(regmap, MT6360_REG_PHYCTRL11, 0x3C60);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_write(regmap, MT6360_REG_RXCTRL1, 0xE8);
> +	if (ret)
> +		return ret;
> +
>   	/* Set shipping mode off, AUTOIDLE on */
>   	return regmap_write(regmap, MT6360_REG_MODECTRL2, 0x7A);
>   }