linux-kernel - [PATCH AUTOSEL 4.9 1/7] spi: qup: call spi_qup_pm_resume

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Message-Id: <20200316023538.2232-1-sashal@kernel.org>
Date:   Sun, 15 Mar 2020 22:35:32 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yuji Sasaki <sasakiy@...omium.org>, Vinod Koul <vkoul@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 1/7] spi: qup: call spi_qup_pm_resume_runtime before suspending

From: Yuji Sasaki <sasakiy@...omium.org>

[ Upstream commit 136b5cd2e2f97581ae560cff0db2a3b5369112da ]

spi_qup_suspend() will cause synchronous external abort when
runtime suspend is enabled and applied, as it tries to
access SPI controller register while clock is already disabled
in spi_qup_pm_suspend_runtime().

Signed-off-by: Yuji sasaki <sasakiy@...omium.org>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Link: https://lore.kernel.org/r/20200214074340.2286170-1-vkoul@kernel.org
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-qup.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 1bfa889b8427a..88b108e1c85fe 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -974,6 +974,11 @@ static int spi_qup_suspend(struct device *device)
 	struct spi_qup *controller = spi_master_get_devdata(master);
 	int ret;
 
+	if (pm_runtime_suspended(device)) {
+		ret = spi_qup_pm_resume_runtime(device);
+		if (ret)
+			return ret;
+	}
 	ret = spi_master_suspend(master);
 	if (ret)
 		return ret;
@@ -982,10 +987,8 @@ static int spi_qup_suspend(struct device *device)
 	if (ret)
 		return ret;
 
-	if (!pm_runtime_suspended(device)) {
-		clk_disable_unprepare(controller->cclk);
-		clk_disable_unprepare(controller->iclk);
-	}
+	clk_disable_unprepare(controller->cclk);
+	clk_disable_unprepare(controller->iclk);
 	return 0;
 }
 
-- 
2.20.1