On Thu, 24 Jan 2019 16:57:11 +0100,
Sameer Pujar wrote:
>
> The runtime PM count is incremented and set to active during hda codec
> device init, but it is decremented and set to suspend during exit only.
> Hence the runtime PM status is always active and hda device cannot be
> put to runtime suspend. Keeping device usage active for entire period,
> though nothing really happening on the device, seems unnecessary.
>
> This patch avoides incrementing runtime PM usage count of the device.
>
> Signed-off-by: Sameer Pujar <spujar@xxxxxxxxxx>
> Reviewed-by: Ravindra Lokhande <rlokhande@xxxxxxxxxx>
> Reviewed-by: Mohan Kumar D <mkumard@xxxxxxxxxx>
This breaks the existing things, I'm afraid.
Did you really test and verify the behavior...?
The runtime PM refcount is decremented at snd_hda_codec_register(),
and that's the place to let runtime suspend of the codec really
effective. (It's not about the controller, though.)
thanks,
Takashi
> ---
> sound/hda/hdac_device.c | 6 ------
> 1 file changed, 6 deletions(-)
>
> diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c
> index 95b073e..72aa342 100644
> --- a/sound/hda/hdac_device.c
> +++ b/sound/hda/hdac_device.c
> @@ -31,9 +31,6 @@ static void default_release(struct device *dev)
> *
> * Returns zero for success or a negative error code.
> *
> - * This function increments the runtime PM counter and marks it active.
> - * The caller needs to turn it off appropriately later.
> - *
> * The caller needs to set the device's release op properly by itself.
> */
> int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
> @@ -55,8 +52,6 @@ int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
> codec->bus = bus;
> codec->addr = addr;
> codec->type = HDA_DEV_CORE;
> - pm_runtime_set_active(&codec->dev);
> - pm_runtime_get_noresume(&codec->dev);
> atomic_set(&codec->in_pm, 0);
>
> err = snd_hdac_bus_add_device(bus, codec);
> @@ -123,7 +118,6 @@ EXPORT_SYMBOL_GPL(snd_hdac_device_init);
> */
> void snd_hdac_device_exit(struct hdac_device *codec)
> {
> - pm_runtime_put_noidle(&codec->dev);
> snd_hdac_bus_remove_device(codec->bus, codec);
> kfree(codec->vendor_name);
> kfree(codec->chip_name);
> --
> 2.7.4
>
>
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