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SubjectRe: [Patch v5 4/6] soc: qcom: Extend RPMh power controller driver to register warming devices.
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On 3/27/20 6:53 PM, Bjorn Andersson wrote:
> On Thu 19 Mar 18:41 PDT 2020, Thara Gopinath wrote:
>
>> RPMh power control hosts power domains that can be used as
>> thermal warming devices. Register these power domains
>> with the generic power domain warming device thermal framework.
>>
>> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
>> Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
>> ---
>>
>> v3->v4:
>> - Introduce a boolean value is_warming_dev in rpmhpd structure to
>> indicate if a generic power domain can be used as a warming
>> device or not.With this change, device tree no longer has to
>> specify which power domain inside the rpmh power domain provider
>> is a warming device.
>> - Move registering of warming devices into a late initcall to
>> ensure that warming devices are registered after thermal
>> framework is initialized.
>
> This information is lost when we merge patches, as such I would like
> such design decisions to be described in the commit message itself.
> But...
>
>>
>> drivers/soc/qcom/rpmhpd.c | 37 ++++++++++++++++++++++++++++++++++++-
>> 1 file changed, 36 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
>> index 7142409a3b77..4e9c0bbb8826 100644
>> --- a/drivers/soc/qcom/rpmhpd.c
>> +++ b/drivers/soc/qcom/rpmhpd.c
>> @@ -11,6 +11,7 @@
>> #include <linux/of_device.h>
>> #include <linux/platform_device.h>
>> #include <linux/pm_opp.h>
>> +#include <linux/pd_warming.h>
>> #include <soc/qcom/cmd-db.h>
>> #include <soc/qcom/rpmh.h>
>> #include <dt-bindings/power/qcom-rpmpd.h>
>> @@ -48,6 +49,7 @@ struct rpmhpd {
>> bool enabled;
>> const char *res_name;
>> u32 addr;
>> + bool is_warming_dev;
>> };
>>
>> struct rpmhpd_desc {
>> @@ -55,6 +57,8 @@ struct rpmhpd_desc {
>> size_t num_pds;
>> };
>>
>> +const struct rpmhpd_desc *global_desc;
>> +
>> static DEFINE_MUTEX(rpmhpd_lock);
>>
>> /* SDM845 RPMH powerdomains */
>> @@ -89,6 +93,7 @@ static struct rpmhpd sdm845_mx = {
>> .pd = { .name = "mx", },
>> .peer = &sdm845_mx_ao,
>> .res_name = "mx.lvl",
>> + .is_warming_dev = true,
>> };
>>
>> static struct rpmhpd sdm845_mx_ao = {
>> @@ -452,7 +457,14 @@ static int rpmhpd_probe(struct platform_device *pdev)
>> &rpmhpds[i]->pd);
>> }
>>
>> - return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
>> + ret = of_genpd_add_provider_onecell(pdev->dev.of_node, data);
>> +
>> + if (ret)
>> + return ret;
>> +
>> + global_desc = desc;
>> +
>> + return 0;
>> }
>>
>> static struct platform_driver rpmhpd_driver = {
>> @@ -469,3 +481,26 @@ static int __init rpmhpd_init(void)
>> return platform_driver_register(&rpmhpd_driver);
>> }
>> core_initcall(rpmhpd_init);
>> +
>> +static int __init rpmhpd_init_warming_device(void)
>> +{
>> + size_t num_pds;
>> + struct rpmhpd **rpmhpds;
>> + int i;
>> +
>> + if (!global_desc)
>> + return -EINVAL;
>> +
>> + rpmhpds = global_desc->rpmhpds;
>> + num_pds = global_desc->num_pds;
>> +
>> + if (!of_find_property(rpmhpds[0]->dev->of_node, "#cooling-cells", NULL))
>> + return 0;
>> +
>> + for (i = 0; i < num_pds; i++)
>> + if (rpmhpds[i]->is_warming_dev)
>> + of_pd_warming_register(rpmhpds[i]->dev, i);
>> +
>> + return 0;
>> +}
>> +late_initcall(rpmhpd_init_warming_device);
>
> ...why can't this be done in rpmhpd_probe()?
>
> In particular with the recent patches from John Stultz to allow rpmhpd
> to be built as a module I don't think there's any guarantees that
> rpmh_probe() will have succeeded before rpmhpd_init_warming_device()
> executes.

It is to take care of boot order.
So this has to happen after the thermal framework is initialized.
Thermal framework is initialized with core_initcall. Can I move the
rpmhpd init as a postcore_initcall ? Then I can get rid of this separate
function and keep it as part of probe.

>
> Regards,
> Bjorn
>

--
Warm Regards
Thara

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