take suspend and resume into consideration
Signed-off-by: HS Liao <hs.liao@xxxxxxxxxxxx>
---
drivers/mailbox/mtk-cmdq-mailbox.c | 44 ++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index d086fd8..747bcd3 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -81,6 +81,7 @@ struct cmdq {
u32 irq;
struct cmdq_thread thread[CMDQ_THR_MAX_COUNT];
struct clk *clock;
+ bool suspended;
};
static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
@@ -206,6 +207,9 @@ static void cmdq_task_exec(struct cmdq_pkt *pkt, struct cmdq_thread *thread)
cmdq = dev_get_drvdata(thread->chan->mbox->dev);
+ /* Client should not flush new tasks if suspended. */
+ WARN_ON(cmdq->suspended);
+
task = kzalloc(sizeof(*task), GFP_ATOMIC);
task->cmdq = cmdq;
INIT_LIST_HEAD(&task->list_entry);
@@ -409,6 +413,39 @@ static void cmdq_thread_handle_timeout(unsigned long data)
spin_unlock_irqrestore(&thread->chan->lock, flags);
}
+static int cmdq_suspend(struct device *dev)
+{
+ struct cmdq *cmdq = dev_get_drvdata(dev);
+ struct cmdq_thread *thread;
+ int i;
+ bool task_running = false;
+
+ cmdq->suspended = true;
+
+ for (i = 0; i < ARRAY_SIZE(cmdq->thread); i++) {
+ thread = &cmdq->thread[i];
+ if (!list_empty(&thread->task_busy_list)) {
+ task_running = true;
+ break;
+ }
+ }
+
+ if (task_running)
+ dev_warn(dev, "exist running task(s) in suspend\n");
+
+ clk_unprepare(cmdq->clock);
+ return 0;
+}
+
+static int cmdq_resume(struct device *dev)
+{
+ struct cmdq *cmdq = dev_get_drvdata(dev);
+
+ WARN_ON(clk_prepare(cmdq->clock) < 0);
+ cmdq->suspended = false;
+ return 0;
+}
+
static int cmdq_remove(struct platform_device *pdev)
{
struct cmdq *cmdq = platform_get_drvdata(pdev);
@@ -532,9 +569,15 @@ static int cmdq_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, cmdq);
WARN_ON(clk_prepare(cmdq->clock) < 0);
+
return 0;
}
+static const struct dev_pm_ops cmdq_pm_ops = {
+ .suspend = cmdq_suspend,
+ .resume = cmdq_resume,
+};
+
static const struct of_device_id cmdq_of_ids[] = {
{.compatible = "mediatek,mt8173-gce",},
{}
@@ -545,6 +588,7 @@ static int cmdq_probe(struct platform_device *pdev)
.remove = cmdq_remove,
.driver = {
.name = "mtk_cmdq",
+ .pm = &cmdq_pm_ops,
.of_match_table = cmdq_of_ids,
}
};
--
1.9.1
--
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