linux-kernel - Re: [PATCH] phy: sun4i-usb: Make sure to disable PHY0 passby for peripheral mode

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Date:   Wed, 17 Apr 2019 11:02:58 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-sunxi@...glegroups.com>
CC:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Jagan Teki <jagan@...nedev.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH] phy: sun4i-usb: Make sure to disable PHY0 passby for
 peripheral mode



On 15/04/19 4:47 PM, Paul Kocialkowski wrote:
> Hi,
> 
> Le jeudi 14 mars 2019 à 14:05 +0100, Paul Kocialkowski a écrit :
>> On platforms where the MUSB and HCI controllers share PHY0, PHY passby
>> is required when using the HCI controller with the PHY, but it must be
>> disabled when the MUSB controller is used instead.
>>
>> Without this, PHY0 passby is always enabled, which results in broken
>> peripheral mode on such platforms (e.g. H3/H5).
>>
>> Fixes: ba4bdc9e1dc0 ("PHY: sunxi: Add driver for sunxi usb phy")
> 
> Does anyone have feedback about this? I was hoping to get it merged
> rather soon since it pretty much fixes USB gadget on H3/R40/V3/V3s.

merged now, thanks.

-Kishon
> 
> Cheers,
> 
> Paul
> 
>> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
>> ---
>>  drivers/phy/allwinner/phy-sun4i-usb.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
>> index 5163097b43df..7b23920e0068 100644
>> --- a/drivers/phy/allwinner/phy-sun4i-usb.c
>> +++ b/drivers/phy/allwinner/phy-sun4i-usb.c
>> @@ -551,6 +551,7 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
>>  	struct sun4i_usb_phy_data *data =
>>  		container_of(work, struct sun4i_usb_phy_data, detect.work);
>>  	struct phy *phy0 = data->phys[0].phy;
>> +	struct sun4i_usb_phy *phy = phy_get_drvdata(phy0);
>>  	bool force_session_end, id_notify = false, vbus_notify = false;
>>  	int id_det, vbus_det;
>>  
>> @@ -607,6 +608,9 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
>>  			mutex_unlock(&phy0->mutex);
>>  		}
>>  
>> +		/* Enable PHY0 passby for host mode only. */
>> +		sun4i_usb_phy_passby(phy, !id_det);
>> +
>>  		/* Re-route PHY0 if necessary */
>>  		if (data->cfg->phy0_dual_route)
>>  			sun4i_usb_phy0_reroute(data, id_det);