This patch adds suspend to idle support for Qualcomm processors. While
suspend to memory will be a valid state, there won't be any special
handling or power savings over the suspend to idle.
Signed-off-by: Andy Gross <andy.gross@xxxxxxxxxx>
---
drivers/soc/qcom/Makefile | 1 +
drivers/soc/qcom/suspend.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 78 insertions(+)
create mode 100644 drivers/soc/qcom/suspend.c
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index fdd664e..7c479d3 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
obj-$(CONFIG_QCOM_SMP2P) += smp2p.o
obj-$(CONFIG_QCOM_SMSM) += smsm.o
obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
+obj-$(CONFIG_SUSPEND) += suspend.o
diff --git a/drivers/soc/qcom/suspend.c b/drivers/soc/qcom/suspend.c
new file mode 100644
index 0000000..7d3f2dd
--- /dev/null
+++ b/drivers/soc/qcom/suspend.c
@@ -0,0 +1,77 @@
+/*
+ * (C) Copyright 2016 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/cpuidle.h>
+#include <linux/suspend.h>
+
+
+static void qcom_pm_enter_freeze(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
+{
+ drv->states[index].enter(dev, drv, index);
+}
+
+static const struct of_device_id qcom_idle_state_match[] = {
+ { .compatible = "qcom,idle-state-spc", },
+ { },
+};
+
+static const struct platform_suspend_ops qcom_suspend_ops = {
+ .valid = suspend_valid_only_mem,
+};
+
+static int __init qcom_pm_init(void)
+{
+ struct cpuidle_device *cpu_dev;
+ struct cpuidle_driver *cpu_drv;
+ int state_count;
+ struct device_node *state_np, *cpu_np;
+ const struct of_device_id *match;
+ int i;
+
+ /* configure CPU enter_freeze if applicable */
+ for_each_present_cpu(i) {
+ cpu_np = of_get_cpu_node(i, NULL);
+ cpu_dev = per_cpu_ptr(cpuidle_devices, i);
+ cpu_drv = cpuidle_get_cpu_driver(cpu_dev);
+
+ if (!cpu_dev || !cpu_drv) {
+ of_node_put(cpu_np);
+ return -EPROBE_DEFER;
+ }
+
+ state_count = 0;
+ state_np = of_parse_phandle(cpu_np, "cpu-idle-states",
+ state_count);
+
+ while (state_np) {
+ match = of_match_node(qcom_idle_state_match,
+ state_np);
+
+ state_count++;
+ if (match)
+ cpu_drv->states[state_count].enter_freeze =
+ &qcom_pm_enter_freeze;
+ of_node_put(state_np);
+
+ state_np = of_parse_phandle(cpu_np, "cpu-idle-states",
+ state_count);
+ }
+
+ of_node_put(cpu_np);
+ }
+
+ suspend_set_ops(&qcom_suspend_ops);
+
+ return 0;
+}
+
+late_initcall(qcom_pm_init);
--
1.9.1
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