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

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Message-ID: <5664419.DvuYhMxLoT@z3ntu.xyz>
Date:   Wed, 19 Apr 2023 18:00:35 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     ~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,
        Konrad Dybcio <konrad.dybcio@...aro.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

Hi Konrad,

On Montag, 30. Jänner 2023 21:37:29 CEST Luca Weiss wrote:
> On Montag, 30. Jänner 2023 19:42:51 CET Konrad Dybcio wrote:
> > 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.
> 
> Yeah that actually seems to work...
> 
> But downstream's using this +0x4000 only for tsens it seems
> 
>    <0xfc4bc000 0x1000> as "tsens_eeprom_physical"
> 
> qcom,clock-krait-8974 is using this:
> 
>     <0xfc4b80b0 0x08> as "efuse"
> 
> Also seems HDMI driver is using a mix for HDCP stuff
> 
>   drivers/video/msm/mdss/mdss_hdmi_util.h:
> 
>     /* QFPROM Registers for HDMI/HDCP */
>     #define QFPROM_RAW_FEAT_CONFIG_ROW0_LSB  (0x000000F8)
>     #define QFPROM_RAW_FEAT_CONFIG_ROW0_MSB  (0x000000FC)
>     #define HDCP_KSV_LSB                     (0x000060D8)
>     #define HDCP_KSV_MSB                     (0x000060DC)
> 
> Any clue why Qualcomm used it this way in downstream? I'd rather not deviate
> too much if not for a good reason...

Any comments on the above?

Regards
Luca

> 
> Regards
> Luca
> 
> > 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,