linux-kernel - Re: [PATCH] ARM: dts: qcom: msm8974: correct qfprom node reg

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Date:   Mon, 30 Jan 2023 19:42:51 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        linux-arm-msm@...r.kernel.org
Cc:     Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Craig Tatlor <ctatlor97@...il.com>
Subject: Re: [PATCH] ARM: dts: qcom: msm8974: correct qfprom node reg



On 30.01.2023 19:36, Luca Weiss wrote:
> On Montag, 30. Jänner 2023 19:30:04 CET Konrad Dybcio wrote:
>> On 30.01.2023 19:20, luca@...tu.xyz wrote:
>>> From: Craig Tatlor <ctatlor97@...il.com>
>>>
>>> The qfprom actually starts at 0xfc4b8000 instead of 0xfc4bc000 as
>>> defined previously. Adjust the tsens offsets accordingly.
>>>
>>> [luca@...tu.xyz: extract to standalone patch]
>>>
>>> Fixes: c59ffb519357 ("arm: dts: msm8974: Add thermal zones, tsens and
>>> qfprom nodes") Signed-off-by: Craig Tatlor <ctatlor97@...il.com>
>>> Signed-off-by: Luca Weiss <luca@...tu.xyz>
>>> ---
>>
>> Isn't this a raw vs ecc-corrected values problem?
> 
> Not quite sure what you mean.
The QFPROM is split into two parts: one where raw values
are stored, and the other one where ECC-corrected copies
of them reside. Usually it's at offset of 0x4000. We should
generally be using the ECC-corrected ones, because.. well..
they are ECC-corrected.. You may want to check if the
fuse you're adding reads the same value at +0x4000.

Konrad
> 
> The original intention behind this patch is to allow to use the pvs fuse at 
> (now) 0xb0 which was inaccessible with the former definition.
> 
>     pvs: pvs@b0 {
>         reg = <0xb0 0x8>;
>     };
> 
> Regards
> Luca
> 
>>
>> Konrad
>>
>>>  arch/arm/boot/dts/qcom-msm8974.dtsi | 12 ++++++------
>>>  1 file changed, 6 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi
>>> b/arch/arm/boot/dts/qcom-msm8974.dtsi index 8d216a3c0851..922d235c6065
>>> 100644
>>> --- a/arch/arm/boot/dts/qcom-msm8974.dtsi
>>> +++ b/arch/arm/boot/dts/qcom-msm8974.dtsi
>>> @@ -1132,16 +1132,16 @@ restart@...ab000 {
>>>
>>>  			reg = <0xfc4ab000 0x4>;
>>>  		
>>>  		};
>>>
>>> -		qfprom: qfprom@...bc000 {
>>> +		qfprom: qfprom@...b8000 {
>>>
>>>  			compatible = "qcom,msm8974-qfprom", 
> "qcom,qfprom";
>>>
>>> -			reg = <0xfc4bc000 0x1000>;
>>> +			reg = <0xfc4b8000 0x7000>;
>>>
>>>  			#address-cells = <1>;
>>>  			#size-cells = <1>;
>>>
>>> -			tsens_calib: calib@d0 {
>>> -				reg = <0xd0 0x18>;
>>> +			tsens_calib: calib@...0 {
>>> +				reg = <0x40d0 0x18>;
>>>
>>>  			};
>>>
>>> -			tsens_backup: backup@440 {
>>> -				reg = <0x440 0x10>;
>>> +			tsens_backup: backup@...0 {
>>> +				reg = <0x4440 0x10>;
>>>
>>>  			};
>>>  		
>>>  		};
>>>
>>> ---
>>> base-commit: 6d796c50f84ca79f1722bb131799e5a5710c4700
>>> change-id: 20230130-msm8974-qfprom-619c0e8f26eb
>>>
>>> Best regards,
> 
> 
> 
>