| Message ID | 1448976866-7892-4-git-send-email-m.szyprowski@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 1 December 2015 at 14:34, Marek Szyprowski <m.szyprowski@samsung.com> 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@samsung.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> 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@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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;
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@samsung.com> --- drivers/amba/bus.c | 6 ++++++ 1 file changed, 6 insertions(+)