[PATCH 5.9 012/255] spi: imx: fix runtime pm support for !CONFIG_PM

Greg Kroah-Hartman
2020-11-17T13:52:43Z

From: Sascha Hauer <s.hauer@pengutronix.de>

[ Upstream commit 43b6bf406cd0319e522638f97c9086b7beebaeaa ]

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]
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20201021104513.21560-1-s.hauer@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 e38e5ad3c7068..9aac515b718c8 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);
/*
@@ -1722,8 +1725,12 @@ out_bitbang_start:
spi_imx_sdma_exit(spi_imx);
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);

--
2.27.0