spi: stm32: fixes pm_runtime calls in probe/remove

Add pm_runtime calls in probe/probe error path and remove
in order to be consistent in all places in ordering and
ensure that pm_runtime is disabled prior to resources used
by the SPI controller.

This patch also fixes the 2 following warnings on driver remove:
WARNING: CPU: 0 PID: 743 at drivers/clk/clk.c:594 clk_core_disable_lock+0x18/0x24
WARNING: CPU: 0 PID: 743 at drivers/clk/clk.c:476 clk_unprepare+0x24/0x2c

Fixes: 038ac869c9d2 ("spi: stm32: add runtime PM support")

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1625646426-5826-2-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 65b37c8..05618a6 100644 (file)
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -1928,6 +1928,7 @@ static int stm32_spi_probe(struct platform_device *pdev)
                master->can_dma = stm32_spi_can_dma;
 
        pm_runtime_set_active(&pdev->dev);
+       pm_runtime_get_noresume(&pdev->dev);
        pm_runtime_enable(&pdev->dev);
 
        ret = spi_register_master(master);
@@ -1943,6 +1944,8 @@ static int stm32_spi_probe(struct platform_device *pdev)
 
 err_pm_disable:
        pm_runtime_disable(&pdev->dev);
+       pm_runtime_put_noidle(&pdev->dev);
+       pm_runtime_set_suspended(&pdev->dev);
 err_dma_release:
        if (spi->dma_tx)
                dma_release_channel(spi->dma_tx);
@@ -1959,9 +1962,14 @@ static int stm32_spi_remove(struct platform_device *pdev)
        struct spi_master *master = platform_get_drvdata(pdev);
        struct stm32_spi *spi = spi_master_get_devdata(master);
 
+       pm_runtime_get_sync(&pdev->dev);
+
        spi_unregister_master(master);
        spi->cfg->disable(spi);
 
+       pm_runtime_disable(&pdev->dev);
+       pm_runtime_put_noidle(&pdev->dev);
+       pm_runtime_set_suspended(&pdev->dev);
        if (master->dma_tx)
                dma_release_channel(master->dma_tx);
        if (master->dma_rx)
@@ -1969,7 +1977,6 @@ static int stm32_spi_remove(struct platform_device *pdev)
 
        clk_disable_unprepare(spi->clk);
 
-       pm_runtime_disable(&pdev->dev);
 
        pinctrl_pm_select_sleep_state(&pdev->dev);