Re: [PATCH v3 6/7] soc: qcom: Add RPMh Power domain driver

Rajendra Nayak
2018-06-13T03:30:22Z

On 06/13/2018 01:12 AM, Matthias Kaehlcke wrote:
> Hi,
>
> On Tue, Jun 12, 2018 at 10:10:51AM +0530, Rajendra Nayak wrote:
>> The RPMh Power domain driver aggregates the corner votes from various
>> consumers for the ARC resources and communicates it to RPMh.
>>
>> We also add data for all power domains on sdm845 SoC as part of the patch.
>> The driver can be extended to support other SoCs which support RPMh
>>
>> Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
>> ---
>> drivers/soc/qcom/Kconfig | 9 +
>> drivers/soc/qcom/Makefile | 1 +
>> drivers/soc/qcom/rpmhpd.c | 427 ++++++++++++++++++++++++
>> include/dt-bindings/power/qcom-rpmhpd.h | 31 ++
>> 4 files changed, 468 insertions(+)
>> create mode 100644 drivers/soc/qcom/rpmhpd.c
>> create mode 100644 include/dt-bindings/power/qcom-rpmhpd.h
>>
>> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
>> index 5c54931a7b99..7cb7eba2b997 100644
>> --- a/drivers/soc/qcom/Kconfig
>> +++ b/drivers/soc/qcom/Kconfig
>> @@ -74,6 +74,15 @@ config QCOM_RMTFS_MEM
>>
>> Say y here if you intend to boot the modem remoteproc.
>>
>> +config QCOM_RPMHPD
>> + tristate "Qualcomm RPMh Power domain driver"
>> + depends on QCOM_RPMH && QCOM_COMMAND_DB
>> + help
>> + QCOM RPMh Power domain driver to support power-domains with
>> + performance states. The driver communicates a performance state
>> + value to RPMh which then translates it into corresponding voltage
>> + for the voltage rail.
>> +
>> config QCOM_RPMPD
>> tristate "Qualcomm RPM Power domain driver"
>> depends on MFD_QCOM_RPM && QCOM_SMD_RPM
>> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
>> index 9550c170de93..499513f63bef 100644
>> --- a/drivers/soc/qcom/Makefile
>> +++ b/drivers/soc/qcom/Makefile
>> @@ -16,3 +16,4 @@ obj-$(CONFIG_QCOM_SMSM) += smsm.o
>> obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
>> obj-$(CONFIG_QCOM_APR) += apr.o
>> obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o
>> +obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o
>> diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
>> new file mode 100644
>> index 000000000000..7083ec1590ff
>> --- /dev/null
>> +++ b/drivers/soc/qcom/rpmhpd.c
>> @@ -0,0 +1,427 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Copyright (c) 2018, The Linux Foundation. All rights reserved.*/
>> +
>> +#include <linux/err.h>
>> +#include <linux/export.h>
>> +#include <linux/init.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/mutex.h>
>> +#include <linux/pm_domain.h>
>> +#include <linux/slab.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pm_opp.h>
>> +#include <soc/qcom/cmd-db.h>
>> +#include <soc/qcom/rpmh.h>
>> +#include <dt-bindings/power/qcom-rpmhpd.h>
>> +
>> +#define domain_to_rpmhpd(domain) container_of(domain, struct rpmhpd, pd)
>> +
>> +#define DEFINE_RPMHPD_AO(_platform, _name, _active) \
>> + static struct rpmhpd _platform##_##_active; \
>> + static struct rpmhpd _platform##_##_name = { \
>> + .pd = { .name = #_name, }, \
>> + .peer = &_platform##_##_active, \
>> + .res_name = #_name".lvl", \
>> + .valid_state_mask = (BIT(RPMH_ACTIVE_ONLY_STATE) | \
>> + BIT(RPMH_WAKE_ONLY_STATE) | \
>> + BIT(RPMH_SLEEP_STATE)), \
>> + }; \
>> + static struct rpmhpd _platform##_##_active = { \
>> + .pd = { .name = #_active, }, \
>> + .peer = &_platform##_##_name, \
>> + .active_only = true, \
>> + .res_name = #_name".lvl", \
>> + .valid_state_mask = (BIT(RPMH_ACTIVE_ONLY_STATE) | \
>> + BIT(RPMH_WAKE_ONLY_STATE) | \
>> + BIT(RPMH_SLEEP_STATE)), \
>> + }
>> +
>> +#define DEFINE_RPMHPD(_platform, _name) \
>> + static struct rpmhpd _platform##_##_name = { \
>> + .pd = { .name = #_name, }, \
>> + .res_name = #_name".lvl", \
>> + .valid_state_mask = BIT(RPMH_ACTIVE_ONLY_STATE), \
>> + }
>
> Perhaps describe briefly the concept of an AO (active-only) and a peer
> domain. It is not necessarily evident why an AO domain would have
> WAKE_ONLY and SLEEP_ONLY as valid states, while the non-AO domain has
> ACTIVE_ONLY as it's only state.

Sure, I'll add in more comments to describe this.

>
>> +/*
>> + * This function is used to aggregate the votes across the active only
>> + * resources and its peers. The aggregated votes are send to RPMh as
>
> s/send/sent/
>
>> + * ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
>> + * (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
>> + * on system sleep).
>> + * We send ACTIVE_ONLY votes for resources without any peers. For others,
>> + * which have an active only peer, all 3 Votes are sent.
>
> s/Votes/votes/
>
>> +static int rpmhpd_probe(struct platform_device *pdev)
>> +{
>> + int i, ret;
>> + size_t num;
>
> nit: naming this num_pds would slightly improve readability (e.g. make
> it evident that the for loop iterates over the PDs).

sure, will change

>
>> + struct genpd_onecell_data *data;
>> + struct rpmhpd **rpmhpds;
>> + const struct rpmhpd_desc *desc;
>> +
>> + desc = of_device_get_match_data(&pdev->dev);
>> + if (!desc)
>> + return -EINVAL;
>> +
>> + rpmhpds = desc->rpmhpds;
>> + num = desc->num_pds;
>> +
>> + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
>> + if (!data)
>> + return -ENOMEM;
>> +
>> + data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains),
>> + GFP_KERNEL);
>
> Check for NULL?

yes, indeed, thanks for the review. I will fix all these up with a v4.

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