spi: spi-zynqmp-gqspi: Fix runtime PM imbalance in zynqmp_qspi_probe

There is a PM usage counter decrement after zynqmp_qspi_init_hw()
without any refcount increment, which leads to refcount leak.Add
a refcount increment to balance the refcount. Also set
auto_runtime_pm to resume suspended spi controller.

Fixes: 9e3a000362aec ("spi: zynqmp: Add pm runtime support")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Tested-by: Quanyang Wang <quanyang.wang@windriver.com>
Link: https://lore.kernel.org/r/20210415074644.24646-1-dinghao.liu@zju.edu.cn
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 408e348..32e53f3 100644 (file)
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -1163,11 +1163,16 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
        pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
        pm_runtime_set_active(&pdev->dev);
        pm_runtime_enable(&pdev->dev);
+
+       ret = pm_runtime_get_sync(&pdev->dev);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Failed to pm_runtime_get_sync: %d\n", ret);
+               goto clk_dis_all;
+       }
+
        /* QSPI controller initializations */
        zynqmp_qspi_init_hw(xqspi);
 
-       pm_runtime_mark_last_busy(&pdev->dev);
-       pm_runtime_put_autosuspend(&pdev->dev);
        xqspi->irq = platform_get_irq(pdev, 0);
        if (xqspi->irq <= 0) {
                ret = -ENXIO;
@@ -1190,6 +1195,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
        ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
                            SPI_TX_DUAL | SPI_TX_QUAD;
        ctlr->dev.of_node = np;
+       ctlr->auto_runtime_pm = true;
 
        ret = devm_spi_register_controller(&pdev->dev, ctlr);
        if (ret) {
@@ -1197,9 +1203,13 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
                goto clk_dis_all;
        }
 
+       pm_runtime_mark_last_busy(&pdev->dev);
+       pm_runtime_put_autosuspend(&pdev->dev);
+
        return 0;
 
 clk_dis_all:
+       pm_runtime_put_sync(&pdev->dev);
        pm_runtime_set_suspended(&pdev->dev);
        pm_runtime_disable(&pdev->dev);
        clk_disable_unprepare(xqspi->refclk);