Re: [PATCH 1/4] phy-sun4i-usb: Fix sun8i_r40_cfg

[qianfan <qianfanguijin@163.com>]

在 2021/6/21 8:33, Andre Przywara 写道:
> On Wed, 16 Jun 2021 10:33:23 +0800
> qianfanguijin@163.com (qianfanguijin@163.com) wrote:
>
> Hi,
>
> first many thanks for sending this! Indeed OTG support was
> broken/missing on the R40, also in Linux.
> So it seems you have the found the problem: the missing PHY multiplex.
> Many thanks for that! This indeed enables OTG functionality for me
> (although with some changes). That means that actually a similar patch
> needs to go through Linux.
> Do you plan on enabling support in Linux as well?
sure.
>> From: qianfan Zhao <qianfanguijin@163.com>
>>
>> The address of sun8i_r40's phyctrl is 0x01c13404,
> But this isn't quite right, is it? See below.

Yes, the right address of R40 is 0x01c13410. I had checked the bsp code 
of allwinner: #if defined (CONFIG_ARCH_SUN50I) || defined 
(CONFIG_ARCH_SUN8IW10) || defined (CONFIG_ARCH_SUN8IW11)#define  
USBPHYC_REG_o_PHYCTL            0x0410#else#define  
USBPHYC_REG_o_PHYCTL            0x0404#endif

But I had no idea why the addres 0x01c13404 can work fine, maybe I load u-boot by using
sunxi-tools, that the usb otg is already init by IBR.

>> enable_pmu and dual_route.
> Ah, of course! The R40 is closer to the A33/A23 here, with not having
> separate EHCI0/OHCI0 controllers, instead relying on the MUSB host IP.
> So indeed we don't have the PHY multiplex for PHY0.
> I think this is the root cause of the non-working OTG support so far!
>
>> Signed-off-by: qianfan Zhao <qianfanguijin@163.com>
>> ---
>>   drivers/phy/allwinner/phy-sun4i-usb.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
>> index 5723c98032..608ba46242 100644
>> --- a/drivers/phy/allwinner/phy-sun4i-usb.c
>> +++ b/drivers/phy/allwinner/phy-sun4i-usb.c
>> @@ -587,10 +587,10 @@ static const struct sun4i_usb_phy_cfg sun8i_r40_cfg = {
>>   	.num_phys = 3,
>>   	.type = sun8i_r40_phy,
>>   	.disc_thresh = 3,
>> -	.phyctl_offset = REG_PHYCTL_A33,
>> +	.phyctl_offset = REG_PHYCTL_A10,
> So this doesn't work for me, no device appearing on the host. Also
> writing anything to this register (+0x04) reads back as 0, so it's not
> implemented, as in the H3. The register at +0x10 however works, and if I
> keep the A33 line, OTG indeed works for me. Same in Linux, btw.
>
>>   	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = true,
>> -	.phy0_dual_route = true,
>> +	.enable_pmu_unk1 = false,
>> +	.phy0_dual_route = false,
> If they are false, you don't need to list them, the default of 0 will
> take care of this.

Thanks for yours guide, I will make a change later.

>
> Cheers,
> Andre
>
>>   };
>>   
>>   static const struct sun4i_usb_phy_cfg sun8i_v3s_cfg = {