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

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Message-ID: <2401830.jE0xQCEvom@z3ntu.xyz>
Date:   Mon, 30 Jan 2023 21:37:29 +0100
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

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...

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,