linux-kernel - [PATCH] spi: imx: fix the unbalanced spi runtime pm management

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Message-Id: <20201124085247.18025-1-xiaoning.wang@nxp.com>
Date:   Tue, 24 Nov 2020 16:52:47 +0800
From:   Clark Wang <xiaoning.wang@....com>
To:     broonie@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        nikita.shubin@...uefel.me
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] spi: imx: fix the unbalanced spi runtime pm management

If set active without increase the usage count of pm, the dont use
autosuspend function will call the suspend callback to close the two
clocks of spi because the usage count is reduced to -1.
This will cause the warning dump below when the defer-probe occurs.

[  129.379701] ecspi2_root_clk already disabled
[  129.384005] WARNING: CPU: 1 PID: 33 at drivers/clk/clk.c:952 clk_core_disable+0xa4/0xb0

So add the get noresume function before set active.

Fixes: 43b6bf406cd0 spi: imx: fix runtime pm support for !CONFIG_PM
Signed-off-by: Clark Wang <xiaoning.wang@....com>
---
 drivers/spi/spi-imx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 7513ef552d79..73ca821763d6 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -1659,6 +1659,7 @@ static int spi_imx_probe(struct platform_device *pdev)
 
 	pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT);
 	pm_runtime_use_autosuspend(spi_imx->dev);
+	pm_runtime_get_noresume(spi_imx->dev);
 	pm_runtime_set_active(spi_imx->dev);
 	pm_runtime_enable(spi_imx->dev);
 
-- 
2.17.1