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SubjectRe: [PATCH] [v4] spi: spi-zynqmp-gqspi: Fix runtime PM imbalance in zynqmp_qspi_probe
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On 4/15/21 3:46 PM, Dinghao Liu wrote:
> 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>
> ---
>
> Changelog:
>
> v2: - Add a refcount increment to fix refcout leak instead of the
> refcount decrement on error.
> Set ctlr->auto_runtime_pm = true.
>
> v3: - Add fix tag.
> Add a return value check against pm_runtime_get_sync().
> Move pm_runtime_{mark_last_busy & put_autosuspend} to the
> end of current function.
>
> v4: - Add error message on failure of pm_runtime_get_sync().
> ---
> drivers/spi/spi-zynqmp-gqspi.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
> index c8fa6ee18ae7..38f3ddd3ea7c 100644
> --- a/drivers/spi/spi-zynqmp-gqspi.c
> +++ b/drivers/spi/spi-zynqmp-gqspi.c
> @@ -1160,11 +1160,16 @@ 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;
> @@ -1187,6 +1192,7 @@ 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) {
> @@ -1194,9 +1200,13 @@ 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);

Test this patch at zcu102 board:

root@xilinx-zynqmp:~# dmesg | grep domain2
[    0.905407] zynqmp_gpd_attach_dev() ff0f0000.spi attached to domain2
domain
[    0.912390] zynqmp_gpd_power_on() Powered on domain2 domain
[    4.350331] zynqmp_gpd_power_off() Powered off domain2 domain
root@xilinx-zynqmp:~# flash_erase /dev/mtd3 0 0
Erasing 4 Kibyte @ 0 --  0 % complete [  153.125894]
zynqmp_gpd_power_on() Powered on domain2 domain
Erasing 4 Kibyte @ 2e8000 -- 49 % complete [  156.134884]
zynqmp_gpd_power_off() Powered off domain2 domain
[  156.142648] zynqmp_gpd_power_on() Powered on domain2 domain
Erasing 4 Kibyte @ 5d5000 -- 99 % complete [  159.148329]
zynqmp_gpd_power_off() Powered off domain2 domain
[  159.154579] zynqmp_gpd_power_on() Powered on domain2 domain
Erasing 4 Kibyte @ 5df000 -- 100 % complete
root@xilinx-zynqmp:~# [  162.910329] zynqmp_gpd_power_off() Powered off
domain2 domain

pm_runtime works now. So

Tested-by: Quanyang Wang <quanyang.wang@windriver.com>

Regards,

Quanyang

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