linux-hardening - Re: [PATCH v7 3/6] phy: qcom-qmp: Add SM6125 UFS PHY support

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Message-ID: <ZAhwTcMZoCQVULQe@hovoldconsulting.com>
Date:   Wed, 8 Mar 2023 12:23:57 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Lux Aliaga <they@...t.lgbt>, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, vkoul@...nel.org,
        kishon@...nel.org, alim.akhtar@...sung.com, avri.altman@....com,
        bvanassche@....org, keescook@...omium.org, tony.luck@...el.com,
        gpiccoli@...lia.com, ~postmarketos/upstreaming@...ts.sr.ht,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-scsi@...r.kernel.org, linux-hardening@...r.kernel.org,
        phone-devel@...r.kernel.org, martin.botka@...ainline.org,
        marijn.suijten@...ainline.org
Subject: Re: [PATCH v7 3/6] phy: qcom-qmp: Add SM6125 UFS PHY support

On Wed, Mar 08, 2023 at 12:15:39PM +0100, Konrad Dybcio wrote:
> 
> 
> On 8.03.2023 12:02, Johan Hovold wrote:
> > On Wed, Mar 08, 2023 at 11:09:48AM +0100, Konrad Dybcio wrote:
> >>
> >>
> >> On 6.03.2023 18:08, Lux Aliaga wrote:
> >>> The SM6125 UFS PHY is compatible with the one from SM6115. Add a
> >>> compatible for it and modify the config from SM6115 to make them
> >>> compatible with the SC8280XP binding
> >>>
> >>> Signed-off-by: Lux Aliaga <they@...t.lgbt>
> >>> Reviewed-by: Martin Botka <martin.botka@...ainline.org>
> >>> ---
> >>>  drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 12 ++++++++++++
> >>>  1 file changed, 12 insertions(+)
> >>>
> >>> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> >>> index 318eea35b972..44c29fdfc551 100644
> >>> --- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> >>> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> >>> @@ -620,6 +620,13 @@ static const char * const qmp_phy_vreg_l[] = {
> >>>  	"vdda-phy", "vdda-pll",
> >>>  };
> >>>  
> >>> +static const struct qmp_ufs_offsets qmp_ufs_offsets_v3_660 = {
> >>> +	.serdes		= 0,
> >>> +	.pcs		= 0xc00,
> >>> +	.tx		= 0x400,
> >>> +	.rx		= 0x600,
> >>> +};
> >>> +
> >>>  static const struct qmp_ufs_offsets qmp_ufs_offsets_v5 = {
> >>>  	.serdes		= 0,
> >>>  	.pcs		= 0xc00,
> >>> @@ -693,6 +700,8 @@ static const struct qmp_phy_cfg sdm845_ufsphy_cfg = {
> >>>  static const struct qmp_phy_cfg sm6115_ufsphy_cfg = {
> >>>  	.lanes			= 1,
> >>>  
> >>> +	.offsets		= &qmp_ufs_offsets_v3_660,
> >> Will this not trigger OOB r/w for the users of qcom,sm6115-smp-ufs-phy
> >> which specify the regions separately (old binding style)?
> > 
> > No, that should work fine.
> So do you think the SM6115 binding could be updated too? Or should
> we keep it as-is for ABI purposes?..

They could be and the possibility has been raised. I think it may be
more important to convert the old combo-phy binding (it's on my list,
but I keep getting preempted), but at some point we can get rid of the
legacy UFS binding as well.

> > But looks like this series needs to be rebased on 6.3-rc1 as these
> > offsets are now already set in mainline.
> ..Or did you do that already and I can't find it?

It seems a previous version of this patch was merged almost two months
ago.

	9b9e29af984c ("phy: qcom-qmp: Add SM6125 UFS PHY support")

Not sure what failed here.

Johan