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 <[email protected]> --- drivers/amba/bus.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c index f009936..25715cb 100644 --- a/drivers/amba/bus.c +++ b/drivers/amba/bus.c @@ -373,6 +373,12 @@ int amba_device_add(struct amba_device *dev, struct resource *parent) goto err_release; } + ret = dev_pm_domain_attach(&dev->dev, true); + if (ret) { + iounmap(tmp); + goto err_release; + } + ret = amba_get_enable_pclk(dev); if (ret == 0) { u32 pid, cid; @@ -398,6 +404,7 @@ int amba_device_add(struct amba_device *dev, struct resource *parent) } iounmap(tmp); + dev_pm_domain_detach(&dev->dev, true); if (ret) goto err_release; -- 1.9.2 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
