linux-kernel - [PATCH AUTOSEL 5.4 044/205] memory: mtk-smi: Add PM suspend and resume ops

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Message-Id: <20200116164300.6705-44-sashal@kernel.org>
Date:   Thu, 16 Jan 2020 11:40:19 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yong Wu <yong.wu@...iatek.com>, Anan Sun <anan.sun@...iatek.com>,
        Joerg Roedel <jroedel@...e.de>,
        Sasha Levin <sashal@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 044/205] memory: mtk-smi: Add PM suspend and resume ops

From: Yong Wu <yong.wu@...iatek.com>

[ Upstream commit fb03082a54acd66c61535edfefe96b2ff88ce7e2 ]

In the commit 4f0a1a1ae351 ("memory: mtk-smi: Invoke pm runtime_callback
to enable clocks"), we use pm_runtime callback to enable/disable the smi
larb clocks. It will cause the larb's clock may not be disabled when
suspend. That is because device_prepare will call pm_runtime_get_noresume
which will keep the larb's PM runtime status still is active when suspend,
then it won't enter our pm_runtime suspend callback to disable the
corresponding clocks.

This patch adds suspend pm_ops to force disable the clocks, Use "LATE" to
make sure it disable the larb's clocks after the multimedia devices.

Fixes: 4f0a1a1ae351 ("memory: mtk-smi: Invoke pm runtime_callback to enable clocks")
Signed-off-by: Anan Sun <anan.sun@...iatek.com>
Signed-off-by: Yong Wu <yong.wu@...iatek.com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/memory/mtk-smi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index 439d7d886873..a113e811faab 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -366,6 +366,8 @@ static int __maybe_unused mtk_smi_larb_suspend(struct device *dev)
 
 static const struct dev_pm_ops smi_larb_pm_ops = {
 	SET_RUNTIME_PM_OPS(mtk_smi_larb_suspend, mtk_smi_larb_resume, NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
 };
 
 static struct platform_driver mtk_smi_larb_driver = {
@@ -507,6 +509,8 @@ static int __maybe_unused mtk_smi_common_suspend(struct device *dev)
 
 static const struct dev_pm_ops smi_common_pm_ops = {
 	SET_RUNTIME_PM_OPS(mtk_smi_common_suspend, mtk_smi_common_resume, NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
 };
 
 static struct platform_driver mtk_smi_common_driver = {
-- 
2.20.1