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SubjectRe: [PATCH v5 06/10] soc: qcom: Add AOSS QMP genpd provider
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Hey Bjorn,

On 01/31/2019 06:09 AM, Bjorn Andersson wrote:
> The AOSS QMP genpd provider implements control over power-related
> resources related to low-power state associated with the remoteprocs in
> the system as well as control over a set of clocks related to debug
> hardware in the SoC.
>
> Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> Changes since v4:
> - None
>
> Changes since v3:
> - None
>
> drivers/soc/qcom/Kconfig | 9 +++
> drivers/soc/qcom/Makefile | 1 +
> drivers/soc/qcom/aoss-qmp-pd.c | 138 +++++++++++++++++++++++++++++++++
> 3 files changed, 148 insertions(+)
> create mode 100644 drivers/soc/qcom/aoss-qmp-pd.c
>
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index 28ab19bf8c98..893b56b70957 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -12,6 +12,15 @@ config QCOM_AOSS_QMP
> micro-controller in the AOSS, using QMP, to control certain resource
> that are not exposed through RPMh.
>
> +config QCOM_AOSS_QMP_PD
> + tristate "Qualcomm AOSS Messaging Power Domain driver"
> + depends on QCOM_AOSS_QMP
> + select PM_GENERIC_DOMAINS
> + help
> + This driver provides the means of controlling the AOSS's handling of
> + low-power state for resources related to the remoteproc subsystems as
> + well as controlling the debug clocks.
> +
> config QCOM_COMMAND_DB
> bool "Qualcomm Command DB"
> depends on ARCH_QCOM || COMPILE_TEST
> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> index 2c04d27fbf9e..16913e73fddf 100644
> --- a/drivers/soc/qcom/Makefile
> +++ b/drivers/soc/qcom/Makefile
> @@ -1,6 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0
> CFLAGS_rpmh-rsc.o := -I$(src)
> obj-$(CONFIG_QCOM_AOSS_QMP) += aoss-qmp.o
> +obj-$(CONFIG_QCOM_AOSS_QMP_PD) += aoss-qmp-pd.o
> obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o
> obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
> obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o
> diff --git a/drivers/soc/qcom/aoss-qmp-pd.c b/drivers/soc/qcom/aoss-qmp-pd.c
> new file mode 100644
> index 000000000000..82dd569a2bc9
> --- /dev/null
> +++ b/drivers/soc/qcom/aoss-qmp-pd.c
> @@ -0,0 +1,138 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, Linaro Ltd
> + */
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
> +#include <linux/soc/qcom/aoss-qmp.h>
> +#include <dt-bindings/power/qcom-aoss-qmp.h>
> +
> +/* Requests are expected to be 96 bytes long */
> +#define AOSS_QMP_PD_MSG_LEN 96
> +
> +struct qmp_pd {
> + struct qmp *qmp;
> +
> + struct generic_pm_domain pd;
> +
> + const char *name;
> +};
> +
> +#define to_qmp_pd_resource(res) container_of(res, struct qmp_pd, pd)
> +
> +struct qmp_pd_resource {
> + const char *name;
> + int (*on)(struct generic_pm_domain *domain);
> + int (*off)(struct generic_pm_domain *domain);
> +};
> +
> +static int qmp_pd_clock_toggle(struct qmp_pd *res, bool enable)
> +{
> + char buf[AOSS_QMP_PD_MSG_LEN];
> +
> + snprintf(buf, sizeof(buf), "{class: clock, res: %s, val: %d}",
> + res->name, !!enable);
> + return qmp_send(res->qmp, buf, sizeof(buf));
> +}
> +
> +static int qmp_pd_clock_on(struct generic_pm_domain *domain)
> +{
> + return qmp_pd_clock_toggle(to_qmp_pd_resource(domain), true);
> +}
> +
> +static int qmp_pd_clock_off(struct generic_pm_domain *domain)
> +{
> + return qmp_pd_clock_toggle(to_qmp_pd_resource(domain), false);
> +}
> +
> +static int qmp_pd_image_toggle(struct qmp_pd *res, bool enable)
> +{
> + char buf[AOSS_QMP_PD_MSG_LEN];
> +
> + snprintf(buf, sizeof(buf),
> + "{class: image, res: load_state, name: %s, val: %s}",
> + res->name, enable ? "on" : "off");
> + return qmp_send(res->qmp, buf, sizeof(buf));
> +}
> +
> +static int qmp_pd_image_on(struct generic_pm_domain *domain)
> +{
> + return qmp_pd_image_toggle(to_qmp_pd_resource(domain), true);
> +}
> +
> +static int qmp_pd_image_off(struct generic_pm_domain *domain)
> +{
> + return qmp_pd_image_toggle(to_qmp_pd_resource(domain), false);
> +}
> +
> +static const struct qmp_pd_resource sdm845_resources[] = {
> + [AOSS_QMP_QDSS_CLK] = { "qdss", qmp_pd_clock_on, qmp_pd_clock_off },
> + [AOSS_QMP_LS_CDSP] = { "cdsp", qmp_pd_image_on, qmp_pd_image_off },
> + [AOSS_QMP_LS_LPASS] = { "adsp", qmp_pd_image_on, qmp_pd_image_off },
> + [AOSS_QMP_LS_MODEM] = { "modem", qmp_pd_image_on, qmp_pd_image_off },
> + [AOSS_QMP_LS_SLPI] = { "slpi", qmp_pd_image_on, qmp_pd_image_off },
> + [AOSS_QMP_LS_SPSS] = { "spss", qmp_pd_image_on, qmp_pd_image_off },
> + [AOSS_QMP_LS_VENUS] = { "venus", qmp_pd_image_on, qmp_pd_image_off },
> +};
> +
> +static int qmp_pd_probe(struct platform_device *pdev)
> +{
> + struct genpd_onecell_data *data;
> + struct device *parent = pdev->dev.parent;
> + struct qmp_pd *res;
> + struct qmp *qmp;
> + size_t num = ARRAY_SIZE(sdm845_resources);
> + int i;
> +
> + qmp = dev_get_drvdata(pdev->dev.parent);
> + if (!qmp)
> + return -EINVAL;
> +
> + res = devm_kcalloc(&pdev->dev, num, sizeof(*res), GFP_KERNEL);
> + if (!res)
> + return -ENOMEM;
> +
> + 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);

shouldn't we error out here as well?
if (!data->domains)
return -ENOMEM;

> +
> + for (i = 0; i < num; i++) {
> + pm_genpd_init(&res[i].pd, NULL, true);

shouldn't we populate the pd name before the call to
pm_genpd_init?


Apart from the above nits
Tested-by: Sibi Sankar <sibis@codeaurora.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>

> + res[i].qmp = qmp;
> + res[i].name = sdm845_resources[i].name;
> +
> + res[i].pd.name = sdm845_resources[i].name;
> + res[i].pd.power_on = sdm845_resources[i].on;
> + res[i].pd.power_off = sdm845_resources[i].off;
> +
> + data->domains[data->num_domains++] = &res[i].pd;
> + }
> +
> + return of_genpd_add_provider_onecell(parent->of_node, data);
> +}
> +
> +static int qmp_pd_remove(struct platform_device *pdev)
> +{
> + struct device *parent = pdev->dev.parent;
> +
> + of_genpd_del_provider(parent->of_node);
> +
> + return 0;
> +}
> +
> +static struct platform_driver qmp_pd_driver = {
> + .driver = {
> + .name = "aoss_qmp_pd",
> + },
> + .probe = qmp_pd_probe,
> + .remove = qmp_pd_remove,
> +};
> +module_platform_driver(qmp_pd_driver);
> +
> +MODULE_ALIAS("platform:aoss_qmp_pd");
> +MODULE_DESCRIPTION("Qualcomm AOSS QMP load-state driver");
> +MODULE_LICENSE("GPL v2");
>

--
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc, is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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