Re: [PATCH 3/3] fpga: region: Adds runtime PM support

Johan Hovold
2021-06-02T13:02:54Z

On Fri, Apr 02, 2021 at 02:50:49PM +0530, Nava kishore Manne wrote:
> Adds support to handle FPGA/PL power domain. With this patch,
> the PL power domain will be turned on before loading the bitstream
> and turned off while removing/unloading the bitstream using overlays.
> This can be achieved by adding the runtime PM support.
>
> Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
> ---
> drivers/fpga/of-fpga-region.c | 18 +++++++++++++++++-
> 1 file changed, 17 insertions(+), 1 deletion(-)

> /**
> @@ -411,9 +416,16 @@ static int of_fpga_region_probe(struct platform_device *pdev)
> goto eprobe_mgr_put;
> }
>
> + pm_runtime_enable(&pdev->dev);
> + ret = pm_runtime_get_sync(&pdev->dev);
> + if (ret < 0)
> + goto err_pm;
> +
> + pm_runtime_put(&pdev->dev);
> +
> ret = fpga_region_register(region);
> if (ret)
> - goto eprobe_mgr_put;
> + goto err_pm;

Just a drive-by comment: you have PM usage counter imbalance here
(double put).

> of_platform_populate(np, fpga_region_of_match, NULL, &region->dev);
> platform_set_drvdata(pdev, region);
> @@ -422,6 +434,9 @@ static int of_fpga_region_probe(struct platform_device *pdev)
>
> return 0;
>
> +err_pm:
> + pm_runtime_put(&pdev->dev);
> + pm_runtime_disable(&pdev->dev);
> eprobe_mgr_put:
> fpga_mgr_put(mgr);
> return ret;

Johan