[PATCH 1/3] spi: axiado: fix runtime pm imbalance on probe failure

[Johan Hovold <johan@kernel.org>]

Make sure that the controller is active before disabling clocks on late
probe failure and on driver unbind to avoid a clock disable imbalance.

Also make sure that the usage count is balanced on probe failure (e.g.
probe deferral) so that the controller can be suspended when a driver is
later bound.

Note that the runtime PM state can only be set when runtime PM is
disabled.

Fixes: e75a6b00ad79 ("spi: axiado: Add driver for Axiado SPI DB controller")
Cc: stable@vger.kernel.org	# 7.0
Cc: Vladimir Moravcevic <vmoravcevic@axiado.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/spi/spi-axiado.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-axiado.c b/drivers/spi/spi-axiado.c
index dc55c55ae63c..6449b376a3a8 100644
--- a/drivers/spi/spi-axiado.c
+++ b/drivers/spi/spi-axiado.c
@@ -842,8 +842,6 @@ static int ax_spi_probe(struct platform_device *pdev)
 
 	ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
 
-	pm_runtime_put_autosuspend(&pdev->dev);
-
 	ctlr->mem_ops = &ax_spi_mem_ops;
 
 	ret = spi_register_controller(ctlr);
@@ -852,11 +850,16 @@ static int ax_spi_probe(struct platform_device *pdev)
 		goto clk_dis_all;
 	}
 
+	pm_runtime_put_autosuspend(&pdev->dev);
+
 	return ret;
 
 clk_dis_all:
-	pm_runtime_set_suspended(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
+
 	clk_disable_unprepare(xspi->ref_clk);
 clk_dis_apb:
 	clk_disable_unprepare(xspi->pclk);
@@ -877,10 +880,14 @@ static void ax_spi_remove(struct platform_device *pdev)
 	struct spi_controller *ctlr = platform_get_drvdata(pdev);
 	struct ax_spi *xspi = spi_controller_get_devdata(ctlr);
 
+	pm_runtime_get_sync(&pdev->dev);
+
 	spi_unregister_controller(ctlr);
 
-	pm_runtime_set_suspended(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
 
 	clk_disable_unprepare(xspi->ref_clk);
 	clk_disable_unprepare(xspi->pclk);
-- 
2.52.0