linux-kernel - Re: [PATCH 4/4] drivers: qcom: rpmh-rsc: Add RSC power domain support

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Message-ID: <c1aba2c1-dfbb-0529-d982-f35106879b77@codeaurora.org>
Date:   Fri, 23 Aug 2019 12:19:28 +0530
From:   Maulik Shah <mkshah@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>, agross@...nel.org,
        david.brown@...aro.org, linux-arm-msm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        bjorn.andersson@...aro.org, evgreen@...omium.org,
        dianders@...omium.org, rnayak@...eaurora.org, ilina@...eaurora.org,
        lsrao@...eaurora.org, ulf.hansson@...aro.org
Subject: Re: [PATCH 4/4] drivers: qcom: rpmh-rsc: Add RSC power domain support


On 8/14/2019 11:55 PM, Stephen Boyd wrote:
> Quoting Maulik Shah (2019-08-13 01:24:42)
>> diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
>> index e278fc11fe5c..bd8e9f1a43b4 100644
>> --- a/drivers/soc/qcom/rpmh-rsc.c
>> +++ b/drivers/soc/qcom/rpmh-rsc.c
>> @@ -498,6 +498,32 @@ static int tcs_ctrl_write(struct rsc_drv *drv, const struct tcs_request *msg)
>>          return ret;
>>   }
>>   
>> +/**
>> + *  rpmh_rsc_ctrlr_is_idle: Check if any of the AMCs are busy.
>> + *
>> + *  @drv: The controller
>> + *
>> + *  Returns false if the TCSes are engaged in handling requests,
>> + *  True if controller is idle.
>> + */
>> +static bool rpmh_rsc_ctrlr_is_idle(struct rsc_drv *drv)
>> +{
>> +       int m;
>> +       struct tcs_group *tcs = get_tcs_of_type(drv, ACTIVE_TCS);
>> +       bool ret = true;
>> +
>> +       spin_lock(&drv->lock);
>> +       for (m = tcs->offset; m < tcs->offset + tcs->num_tcs; m++) {
>> +               if (!tcs_is_free(drv, m)) {
> Isn't this a copy of an existing function in the rpmh driver?
No.  The changes to add this were previously posted but did not went it.
>> +                       ret = false;
>> +                       break;
>> +               }
>> +       }
>> +       spin_unlock(&drv->lock);
>> +
>> +       return ret;
>> +}
>> +
>>   /**
>>    * rpmh_rsc_write_ctrl_data: Write request to the controller
>>    *
>> @@ -521,6 +547,65 @@ int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv, const struct tcs_request *msg)
>>          return tcs_ctrl_write(drv, msg);
>>   }
>>   
>> +int rpmh_domain_power_off(struct generic_pm_domain *rsc_pd)
>> +{
>> +       struct rsc_drv *drv = container_of(rsc_pd, struct rsc_drv, rsc_pd);
>> +       int ret = 0;
>> +
>> +       /*
>> +        * RPMh domain can not be powered off when there is pending ACK for
>> +        * ACTIVE_TCS request. Exit when controller is busy.
>> +        */
>> +
>> +       ret = rpmh_rsc_ctrlr_is_idle(drv);
>> +       if (!ret)
>> +               goto exit;
> return 0? Shouldn't it return some negative value?
Done.
>> +
>> +       ret = rpmh_flush(&drv->client);
>> +       if (ret)
>> +               goto exit;
> Why not just return rpmh_flush(...)?
>
> The usage of goto in this function is entirely unnecessary.
Done.
>> +
>> +exit:
>> +       return ret;
>> +}
>> +
>> +static int rpmh_probe_power_domain(struct platform_device *pdev,
>> +                                  struct rsc_drv *drv)
>> +{
>> +       int ret = -ENOMEM;
>> +       struct generic_pm_domain *rsc_pd = &drv->rsc_pd;
>> +       struct device_node *dn = pdev->dev.of_node;
>> +
>> +       rsc_pd->name = kasprintf(GFP_KERNEL, "%s", dn->name);
>> +       if (!rsc_pd->name)
>> +               goto exit;
> return -ENOMEM;
Done.
>> +
>> +       rsc_pd->name = kbasename(rsc_pd->name);
>> +       rsc_pd->power_off = rpmh_domain_power_off;
>> +       rsc_pd->flags |= GENPD_FLAG_IRQ_SAFE;
>> +
>> +       ret = pm_genpd_init(rsc_pd, NULL, false);
>> +       if (ret)
>> +               goto free_name;
>> +
>> +       ret = of_genpd_add_provider_simple(dn, rsc_pd);
>> +       if (ret)
>> +               goto remove_pd;
>> +
>> +       pr_debug("init PM domain %s\n", rsc_pd->name);
>> +
>> +       return ret;
> 	ret = of_genpd_add_provider_simple(...)
> 	if (!ret)
> 		return 0;
>
> Drop the pr_debug(), it's not useful.
Done.
>> +
>> +remove_pd:
>> +       pm_genpd_remove(rsc_pd);
>> +
>> +free_name:
>> +       kfree(rsc_pd->name);
>> +
>> +exit:
>> +       return ret;
> Please remove newlines between labels above.
Done.

-- 
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