[PATCH] spi: imx: fix runtime pm support for !CONFIG_PM

[Sascha Hauer <s.hauer@pengutronix.de>]

525c9e5a32bd introduced pm_runtime support for the i.MX SPI driver. With
this pm_runtime is used to bring up the clocks initially. When CONFIG_PM
is disabled the clocks are no longer enabled and the driver doesn't work
anymore. Fix this by enabling the clocks in the probe function and
telling pm_runtime that the device is active using
pm_runtime_set_active().

Fixes: 525c9e5a32bd spi: imx: enable runtime pm support
Tested-by: Christian Eggers <ceggers@arri.de> [tested for !CONFIG_PM only]
Cc: stable@vger.kernel.org  # 5.9.x only
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/spi/spi-imx.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 38a5f1304cec..c796e937dc6a 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -1674,15 +1674,18 @@ static int spi_imx_probe(struct platform_device *pdev)
 		goto out_master_put;
 	}
 
-	pm_runtime_enable(spi_imx->dev);
+	ret = clk_prepare_enable(spi_imx->clk_per);
+	if (ret)
+		goto out_master_put;
+
+	ret = clk_prepare_enable(spi_imx->clk_ipg);
+	if (ret)
+		goto out_put_per;
+
 	pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT);
 	pm_runtime_use_autosuspend(spi_imx->dev);
-
-	ret = pm_runtime_get_sync(spi_imx->dev);
-	if (ret < 0) {
-		dev_err(spi_imx->dev, "failed to enable clock\n");
-		goto out_runtime_pm_put;
-	}
+	pm_runtime_set_active(spi_imx->dev);
+	pm_runtime_enable(spi_imx->dev);
 
 	spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
 	/*
@@ -1719,8 +1722,12 @@ static int spi_imx_probe(struct platform_device *pdev)
 
 out_runtime_pm_put:
 	pm_runtime_dont_use_autosuspend(spi_imx->dev);
-	pm_runtime_put_sync(spi_imx->dev);
+	pm_runtime_set_suspended(&pdev->dev);
 	pm_runtime_disable(spi_imx->dev);
+
+	clk_disable_unprepare(spi_imx->clk_ipg);
+out_put_per:
+	clk_disable_unprepare(spi_imx->clk_per);
 out_master_put:
 	spi_master_put(master);
 
-- 
2.20.1