linux-kernel - Re: [PATCH 8/9] arm64: dts: meson: g12a: Add G12A USB nodes

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Message-ID: <5C8D0A0C.4040807@baylibre.com>
Date:   Sat, 16 Mar 2019 15:37:00 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     khilman@...libre.com, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 8/9] arm64: dts: meson: g12a: Add G12A USB nodes



Le 15/03/2019 22:40, Martin Blumenstingl a écrit :
> On Thu, Mar 7, 2019 at 4:15 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> This patch adds the nodes for the USB Complex found in the Amlogic
>> G12A SoC.
>>
>> It includes the :
>> - 2 USB2 PHYs
>> - 1 USB3 + PCIE Combo PHY
>> - the USB Glue with it's DWC2 and DWC3 sub-nodes
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> 
> [...]
>> +                               g-tx-fifo-size = <128 128 16 16 16>;
> I'm not sure about these values but it seems you have already successfully them.
> buildroot_openlinux_kernel_4.9_fbdev_20180706 uses the following
> values (which are identical to the ones on GXL/GXM, but using the
> values below I couldn't get dwc2 to work on GXL when I tried it last):
>   dev_tx_fifo_size[0] = 128;
>   dev_tx_fifo_size[1] = 128;
>   dev_tx_fifo_size[2] = 128;
>   dev_tx_fifo_size[3] = 16;
>   dev_tx_fifo_size[4] = 16;


Same for me, only <128 128 16 16 16> worked for me.

> 
> Thus I'm still giving my Reviewed-by based on the assumption that the
> g-tx-fifo-size values you have are working (at least for you)

Indeed, I tried the amlogic values without success, I suspect the driver they use
(the Sysnopsys out-of-tree driver) uses these values differently.

Thanks,
Neil

> 
> 
> Regards
> Martin
>