On 1 December 2015 at 14:34, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote:
> To read pid/cid registers, the probed device need to be properly turned on.
> When it is inside a power domain, the bus code should ensure that the
> given power domain is enabled before trying to access device's registers.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Kind regards
Uffe
> ---
> drivers/amba/bus.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
> index 879a421..8d182a4 100644
> --- a/drivers/amba/bus.c
> +++ b/drivers/amba/bus.c
> @@ -365,6 +365,10 @@ static int amba_read_periphid(struct amba_device *dev)
> if (!tmp)
> return -ENOMEM;
>
> + ret = dev_pm_domain_attach(&dev->dev, true);
> + if (ret == -EPROBE_DEFER)
> + goto err_unmap;
> +
> ret = amba_get_enable_pclk(dev);
> if (ret == 0) {
> u32 pid, cid;
> @@ -389,6 +393,8 @@ static int amba_read_periphid(struct amba_device *dev)
> ret = -ENODEV;
> }
>
> + dev_pm_domain_detach(&dev->dev, true);
> +err_unmap:
> iounmap(tmp);
>
> return ret;
> --
> 1.9.2
>
--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
