linux-kernel - Re: [PATCH v2 00/15] UFS: Add OPP and interconnect support

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Message-ID: <20230724075250.eezimnx4sum2ffjy@vireshk-i7>
Date:   Mon, 24 Jul 2023 13:22:50 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     vireshk@...nel.org, nm@...com, sboyd@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, andersson@...nel.org,
        konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
        linux-scsi@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        quic_nitirawa@...cinc.com, quic_narepall@...cinc.com,
        quic_bhaskarv@...cinc.com, quic_richardp@...cinc.com,
        quic_nguyenb@...cinc.com, quic_ziqichen@...cinc.com,
        bmasney@...hat.com, krzysztof.kozlowski@...aro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/15] UFS: Add OPP and interconnect support

On 21-07-23, 17:24, Manivannan Sadhasivam wrote:
> On Fri, Jul 21, 2023 at 03:12:06PM +0530, Viresh Kumar wrote:
> > On 20-07-23, 11:10, Manivannan Sadhasivam wrote:
> > > Hi,
> > > 
> > > This series adds OPP (Operating Points) support to UFSHCD driver and
> > > interconnect support to Qcom UFS driver.
> > > 
> > > Motivation behind adding OPP support is to scale both clocks as well as
> > > regulators/performance state dynamically. Currently, UFSHCD just scales
> > > clock frequency during runtime with the help of "freq-table-hz" property
> > > defined in devicetree. With the addition of OPP tables in devicetree (as
> > > done for Qcom SDM845 and SM8250 SoCs in this series) UFSHCD can now scale
> > > both clocks and performance state of power domain which helps in power
> > > saving.
> > > 
> > > For the addition of OPP support to UFSHCD, there are changes required to
> > > the OPP framework and devfreq drivers which are also added in this series.
> > > 
> > > Finally, interconnect support is added to Qcom UFS driver for scaling the
> > > interconnect path dynamically. This is required to avoid boot crash in
> > > recent SoCs and also to save power during runtime. More information is
> > > available in patch 13/13.
> > 
> > Hi Mani,
> > 
> > I have picked the OPP related patches from here (apart from DT one)
> > and sent them separately in a series, along with few changes from me.
> > Also pushed them in my linux-next branch.
> > 
> 
> Thanks Viresh! For patch 8/15, Kbuild bot has identified one potential null ptr
> dereference issue. Could you please fix that in your branch?
> 
> You just need to remove the opp dereference in dev_pm_opp_get_freq_indexed()
> before the IS_ERR_OR_NULL() check as below:
> 
> ```
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 66dc0d0cfaed..683e6e61f80b 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -208,9 +208,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
>   */
>  unsigned long dev_pm_opp_get_freq_indexed(struct dev_pm_opp *opp, u32 index)
>  {
> -       struct opp_table *opp_table = opp->opp_table;
> -
> -       if (IS_ERR_OR_NULL(opp) || index >= opp_table->clk_count) {
> +       if (IS_ERR_OR_NULL(opp) || index >= opp->opp_table->clk_count) {
>                 pr_err("%s: Invalid parameters\n", __func__);
>                 return 0;
>         }

Fixed.

-- 
viresh