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SubjectRe: [PATCH 3/4] phy: rockchip-inno-usb2: allow to force the B-Device Session Valid bit.
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Hi Heiko,

On 15/08/18 12:18, Heiko Stuebner wrote:
> Hi Enric,
>
> Am Mittwoch, 15. August 2018, 11:59:33 CEST schrieb Enric Balletbo i Serra:
>> The OTG disconnection event is generated after the presence/abscense of
>> an ID connection, but some platforms doesn't have the ID pin connected, so
>> the event is not generated. In such case, for detecting the disconnection
>> event, we can get the cable state from an extcon driver. We need, though,
>> to force to set the B-Device Session Valid bit on the PHY to have the
>> device respond to setup address. Otherwise, the following error is
>> shown:
>>
>> usb 2-2: Device not responding to setup address.
>> usb 2-2: device not accepting address 14, error -71
>> usb usb2-port2: unable to enumerate USB device
>>
>> The patch allows to tell the PHY to force the B-Device Session Valid bit
>> when the OTG role is device and clear that bit if the OTG role is host.
>>
>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
>
>> @@ -1024,6 +1051,12 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy,
>> INIT_DELAYED_WORK(&rport->chg_work, rockchip_chg_detect_work);
>> INIT_DELAYED_WORK(&rport->otg_sm_work, rockchip_usb2phy_otg_sm_work);
>>
>> + rport->force_bvalid = false;
>> + if (of_device_is_compatible(rphy->dev->of_node,
>> + "rockchip,rk3399-usb2phy"))
>> + rport->force_bvalid = of_property_read_bool(child_np,
>> + "rockchip,force-bvalid");
>
> That feels a bit clumsy, especially as the rk3399 seems to have the id

Agree, It is, let me explain :)

Ideally we shouldn't have this check, to get rid of this check I only need the
offsets for bvalid_session register for all the compatibles and fill in phy
configuration data (rk3228_phy_cfgs, &rk3328_phy_cfgs, rk3366_phy_cfgs,
rv1108_phy_cfgs)

To be honest I didn't look if all the datasheets are public available, let me do
some research. Or, if anyone has the datasheet and can tell where the
bvalid_session bit is I can fill all the data.

Best regards,
Enric

> connection in general ... maybe you could just make that conditional
> on the presence of the extcon?
>
> Or alternatively if needed put that in the soc-specific data struct we
> have already instead open-coding soc compatible checks.
>
> Heiko
>
>
>

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