spi: cadence: Correct initialisation of runtime PM

Currently the driver calls pm_runtime_put_autosuspend but without ever
having done a pm_runtime_get, this causes the reference count in the pm
runtime core to become -1. The bad reference count causes the core to
sometimes suspend whilst an active SPI transfer is in progress.

arizona spi0.1: SPI transfer timed out
spi_master spi0: failed to transfer one message from queue

The correct proceedure is to do all the initialisation that requires the
hardware to be powered up before enabling the PM runtime, then enable
the PM runtime having called pm_runtime_set_active to inform it that the
hardware is currently powered up. The core will then power it down at
it's leisure and no explicit pm_runtime_put is required.

Fixes: d36ccd9 ("spi: cadence: Runtime pm adaptation")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c
index 7c88f74f7f4701a68091fef91c4ad785cd55179a..94cc0a152449f72c9061a1f74696fd1f39ad279c 100644 (file)
--- a/drivers/spi/spi-cadence.c
+++ b/drivers/spi/spi-cadence.c
@@ -584,11 +584,6 @@ static int cdns_spi_probe(struct platform_device *pdev)
                goto clk_dis_apb;
        }
 
-       pm_runtime_use_autosuspend(&pdev->dev);
-       pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
-       pm_runtime_set_active(&pdev->dev);
-       pm_runtime_enable(&pdev->dev);
-
        ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
        if (ret < 0)
                master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS;
@@ -603,8 +598,10 @@ static int cdns_spi_probe(struct platform_device *pdev)
        /* SPI controller initializations */
        cdns_spi_init_hw(xspi);
 
-       pm_runtime_mark_last_busy(&pdev->dev);
-       pm_runtime_put_autosuspend(&pdev->dev);
+       pm_runtime_set_active(&pdev->dev);
+       pm_runtime_enable(&pdev->dev);
+       pm_runtime_use_autosuspend(&pdev->dev);
+       pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
 
        irq = platform_get_irq(pdev, 0);
        if (irq <= 0) {