linux-kernel - Re: [RESEND PATCH v1 5/9] spmi: pmic-arb: correct duplicate APID to PPID mapping logic

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Date:   Tue, 12 Oct 2021 10:44:32 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Fenglin Wu <quic_fenglinw@...cinc.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     collinsd@...eaurora.org, subbaram@...eaurora.org,
        quic_fenglinw@...cinc.com
Subject: Re: [RESEND PATCH v1 5/9] spmi: pmic-arb: correct duplicate APID to PPID mapping logic

Quoting Fenglin Wu (2021-09-16 23:33:00)
> From: David Collins <collinsd@...eaurora.org>
> 
> Correct the way that duplicate PPID mappings are handled for PMIC
> arbiter v5.  The final APID mapped to a given PPID should be the
> one which has write owner = APPS EE, if it exists, or if not
> that, then the first APID mapped to the PPID, if it exists.
> 
> Signed-off-by: David Collins <collinsd@...eaurora.org>
> Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
> ---

Does this need a Fixes tag?

>  drivers/spmi/spmi-pmic-arb.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> index 59c445b..f1b72d8 100644
> --- a/drivers/spmi/spmi-pmic-arb.c
> +++ b/drivers/spmi/spmi-pmic-arb.c
> @@ -918,7 +918,8 @@ static int pmic_arb_read_apid_map_v5(struct spmi_pmic_arb *pmic_arb)
>          * version 5, there is more than one APID mapped to each PPID.
>          * The owner field for each of these mappings specifies the EE which is
>          * allowed to write to the APID.  The owner of the last (highest) APID
> -        * for a given PPID will receive interrupts from the PPID.
> +        * which has the IRQ owner bit set for a given PPID will receive
> +        * interrupts from the PPID.
>          */
>         for (i = 0; ; i++, apidd++) {
>                 offset = pmic_arb->ver_ops->apid_map_offset(i);
> @@ -941,16 +942,16 @@ static int pmic_arb_read_apid_map_v5(struct spmi_pmic_arb *pmic_arb)
>                 apid = pmic_arb->ppid_to_apid[ppid] & ~PMIC_ARB_APID_VALID;
>                 prev_apidd = &pmic_arb->apid_data[apid];
>  
> -               if (valid && is_irq_ee &&
> -                               prev_apidd->write_ee == pmic_arb->ee) {
> +               if (!valid || apidd->write_ee == pmic_arb->ee) {
> +                       /* First PPID mapping or one for this EE */
> +                       pmic_arb->ppid_to_apid[ppid] = i | PMIC_ARB_APID_VALID;
> +               } else if (valid && is_irq_ee &&
> +                          prev_apidd->write_ee == pmic_arb->ee) {

This can be one line please.

>                         /*
>                          * Duplicate PPID mapping after the one for this EE;
>                          * override the irq owner
>                          */
>                         prev_apidd->irq_ee = apidd->irq_ee;
> -               } else if (!valid || is_irq_ee) {
> -                       /* First PPID mapping or duplicate for another EE */
> -                       pmic_arb->ppid_to_apid[ppid] = i | PMIC_ARB_APID_VALID;
>                 }
>  
>                 apidd->ppid = ppid;
> -- 
> 2.7.4
>