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Subject: Re: [PATCH] soc: amlogic: meson-gx-socinfo: Fix S905X3 ID
To:     Christian Hewitt <christianshewitt@gmail.com>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Kevin Hilman <khilman@baylibre.com>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20200604044808.30995-1-christianshewitt@gmail.com>
 <7d58e4db-2893-3675-eb93-ea14c3534b5b@baylibre.com>
 <ACA41DA3-88A4-4141-AEAD-C056C9834B6B@gmail.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <f037849a-0a23-8fdf-f953-28f62c0f9c62@baylibre.com>
Date:   Mon, 8 Jun 2020 14:45:22 +0200
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On 08/06/2020 13:32, Christian Hewitt wrote:
> 
>> On 8 Jun 2020, at 12:58 pm, Neil Armstrong <narmstrong@baylibre.com> wrote:
>>
>>> The current value is taken from Amlogic's 4.9 bsp kernel which appears
>>> to use the wrong ID. For comparison, here's before/after:
>>>
>>> [    0.152237] soc soc0: Amlogic Meson SM1 (Unknown) Revision 2b:c (10:2) Detected
>>> [    0.152463] soc soc0: Amlogic Meson SM1 (S905X3) Revision 2b:c (10:2) Detected
>>
>> For SM1 we have weird values, here are the one we gen on KernelCI:
>> SEI610 (S905D3):
>> Amlogic Meson SM1 (Unknown) Revision 2b:c (50:2)
>>
>> VIM3L (S905D3)
>> Amlogic Meson SM1 (Unknown) Revision 2b:c (4:2)
>>
>> And you report now:
>> Odroid-C4 (S905X4)
>> Amlogic Meson SM1 (Unknown) Revision 2b:c (10:2)
>>
>> And at the time you reported:
>> VIM3L (S905D3)
>> Amlogic Meson SM1 (S905D3) Revision 2b:c (b0:2)
>>
>> So I'm quite lost here….
> 
> In [1] you added the SM1 SoC ID and S905X3 ID { "S905X3", 0x2b, 0x5, 0xf }
> which matches the BSP kernel source.
> 
> In [2] I added a second S905X3 ID { "S905X3", 0x2b, 0xb0, 0xf2 } for VIM3L, but
> this was a mistake (the chip is S905D3) so [3] corrected it to { "S905D3", 0x2b,
> 0xb0, 0xf0 } which matches my VIM3L board. If the VIM3L’s in KernelCI now show
> "2b:c (4:2)” it looks there has been a package change (silicon fixes?) and we
> need to add another S905D3 package ID.
> 
> In the last week I helped three different users install LE on S905X3 Android
> box devices, all of which declare "2b:c (10:2)” as the SoC ID, which matches
> the only S905X3 device I own (Odroid C4). So I assumed the BSP is wrong and
> sent this fix patch.
> 
> If SEI610 is S905X3 (implied by the original SM1 submission from you) KernelCI
> output shows the current ID is wrong (‘Unknown’) so we probably need to fix it
> with { "S905X3", 0x2b, 0x50, 0xf0 } then add new S905D3 (VIM3L) and S905X3 (as
> per this patch) IDs.
> 
> If SEI610 is S905D3 (as stated in this thread) the fix in this patch is still
> correct, but we also need to send a second patch to add two new S905D3 package
> IDs (SEI610 + VIM3L).
> 
> I’ll ping you off-list to discuss.

OK, we have 5 different values :
S905X3	05	0000 0101	(first SEI610 support, early samples)
S905X3	10	0001 0000	(recent S905X3 android boxes, inc Odroid-C4)
S905X3  50	0101 0000	(SEI610 kernelci report, new SEI610 revision)

S905D3  04	0000 0100	(VIM3L in kernelci)
S905D3  b0	1011 0000	(VIM3L)

Seems the early S905X3/S905D3 samples used the low 4 bits to setup the revision.
And the mass-production ones uses the higher 4 bits.

So we can detect all these with the following bits & mask:
	/* Early SM1 Samples */
        { "S905X3", 0x2b, 0x5  0xf5 },
        { "S905D3", 0x2b, 0x4  0xf5 },
	/* Mass production SM1 */
        { "S905X3", 0x2b, 0x10, 0x3f },
        { "S905D3", 0x2b, 0x30  0x3f },

Neil

> 
> Christian
> 
> [1] c9cc9bec36d0 ("soc: amlogic: meson-gx-socinfo: Add SM1 and S905X3 ID”)
> [2] 1d7c541b8a5b ("soc: amlogic: meson-gx-socinfo: Add S905X3 ID for VIM3L”)
> [3] fdfc6997bd08 ("soc: amlogic: meson-gx-socinfo: Fix S905D3 ID for VIM3L”)
> 
>