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[PATCH v2 1/3] firmware: arm_scpi: add support for device power state management

From Sudeep Holla <sudeep.holla@arm.com>
Newsgroups linux.kernel
Subject [PATCH v2 1/3] firmware: arm_scpi: add support for device power state management
Date 2016-06-16 12:40 +0200
Message-ID <rKCSm-7c3-35@gated-at.bofh.it> (permalink)
References <rKCSm-7c3-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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SCPI protocol supports device power state management. This deals with
power states of various peripheral devices in the system other than the
core compute subsystem.

This patch adds support for the power state management of those
peripheral devices.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/arm_scpi.c   | 30 ++++++++++++++++++++++++++++++
 include/linux/scpi_protocol.h |  2 ++
 2 files changed, 32 insertions(+)

diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c
index 51c6db0774cc..438893762076 100644
--- a/drivers/firmware/arm_scpi.c
+++ b/drivers/firmware/arm_scpi.c
@@ -231,6 +231,11 @@ struct sensor_value {
 	__le32 hi_val;
 } __packed;

+struct dev_pstate_set {
+	u16 dev_id;
+	u8 pstate;
+} __packed;
+
 static struct scpi_drvinfo *scpi_info;

 static int scpi_linux_errmap[SCPI_ERR_MAX] = {
@@ -537,6 +542,29 @@ static int scpi_sensor_get_value(u16 sensor, u64 *val)
 	return ret;
 }

+static int scpi_device_get_power_state(u16 dev_id)
+{
+	int ret;
+	u8 pstate;
+	__le16 id = cpu_to_le16(dev_id);
+
+	ret = scpi_send_message(SCPI_CMD_GET_DEVICE_PWR_STATE, &id,
+				sizeof(id), &pstate, sizeof(pstate));
+	return ret ? ret : pstate;
+}
+
+static int scpi_device_set_power_state(u16 dev_id, u8 pstate)
+{
+	int stat;
+	struct dev_pstate_set dev_set = {
+		.dev_id = cpu_to_le16(dev_id),
+		.pstate = pstate,
+	};
+
+	return scpi_send_message(SCPI_CMD_SET_DEVICE_PWR_STATE, &dev_set,
+				 sizeof(dev_set), &stat, sizeof(stat));
+}
+
 static struct scpi_ops scpi_ops = {
 	.get_version = scpi_get_version,
 	.clk_get_range = scpi_clk_get_range,
@@ -548,6 +576,8 @@ static struct scpi_ops scpi_ops = {
 	.sensor_get_capability = scpi_sensor_get_capability,
 	.sensor_get_info = scpi_sensor_get_info,
 	.sensor_get_value = scpi_sensor_get_value,
+	.device_get_power_state = scpi_device_get_power_state,
+	.device_set_power_state = scpi_device_set_power_state,
 };

 struct scpi_ops *get_scpi_ops(void)
diff --git a/include/linux/scpi_protocol.h b/include/linux/scpi_protocol.h
index 35de50a65665..dc5f989be226 100644
--- a/include/linux/scpi_protocol.h
+++ b/include/linux/scpi_protocol.h
@@ -70,6 +70,8 @@ struct scpi_ops {
 	int (*sensor_get_capability)(u16 *sensors);
 	int (*sensor_get_info)(u16 sensor_id, struct scpi_sensor_info *);
 	int (*sensor_get_value)(u16, u64 *);
+	int (*device_get_power_state)(u16);
+	int (*device_set_power_state)(u16, u8);
 };

 #if IS_REACHABLE(CONFIG_ARM_SCPI_PROTOCOL)
--
2.7.4

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Thread

[PATCH v2 0/3] firmware: scpi: add device power domain support Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 12:40 +0200
  [PATCH v2 3/3] firmware: scpi: add device power domain support using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 12:40 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd "Jon Medhurst (Tixy)" <tixy@linaro.org> - 2016-06-16 19:50 +0200
      Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 20:00 +0200
        Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd "Jon Medhurst (Tixy)" <tixy@linaro.org> - 2016-06-17 10:20 +0200
          Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 10:40 +0200
          Re: [PATCH v2 3/3] firmware: scpi: add device power domain support using genpd Kevin Hilman <khilman@baylibre.com> - 2016-06-20 20:00 +0200
            Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-20 20:00 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 11:00 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 11:00 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-20 21:30 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support using genpd Kevin Hilman <khilman@baylibre.com> - 2016-06-21 00:00 +0200
  [PATCH v2 2/3] Documentation: add DT bindings for ARM SCPI power domains Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 12:40 +0200
  [PATCH v2 1/3] firmware: arm_scpi: add support for device power state management Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 12:40 +0200
    Re: [PATCH v2 1/3] firmware: arm_scpi: add support for device power  state management "Jon Medhurst (Tixy)" <tixy@linaro.org> - 2016-06-16 20:10 +0200
      Re: [PATCH v2 1/3] firmware: arm_scpi: add support for device power  state management Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 10:50 +0200
  Re: [PATCH v2 0/3] firmware: scpi: add device power domain support "Jon Medhurst (Tixy)" <tixy@linaro.org> - 2016-06-16 15:20 +0200
    Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 15:30 +0200
      Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Ulf Hansson <ulf.hansson@linaro.org> - 2016-06-17 11:00 +0200
  Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-17 17:30 +0200
    Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 17:40 +0200
  Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Kevin Hilman <khilman@baylibre.com> - 2016-06-20 20:00 +0200
    Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Sudeep Holla <sudeep.holla@arm.com> - 2016-06-20 20:10 +0200

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