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Date: Thu, 09 Apr 2015 07:20:28 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Matthew Garrett <mjg59@...eos.com>
Cc: perex@...ex.cz, alsa-devel@...a-project.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: hda - make power_save threshold per-codec
At Wed, 8 Apr 2015 18:53:48 -0700,
Matthew Garrett wrote:
>
> Modern hardware will often have multiple HDA devices, and the desired
> power saving configuration may vary depending on the codecs attached to
> each of them. Push the power_save value down to the individual codec
> structures, keeping the module parameter as a global control mechanism
> for compatibility purposes.
This patch doesn't apply any longer at all to the recent code, since
the power saving stuff has been already translated to the standard
runtime PM. Take a look at linux-next tree.
Also we can't break the current behavior controlling the power save
via option. Many programs rely on this mechanism, thus changing this
would break its behavior.
In the latest code, the common control via power_save module option is
still there for compatibility, but you can also adjust the value for
each codec in runtime attribute of each codec sysfs in addition.
thanks,
Takashi
>
> Signed-off-by: Matthew Garrett <mjg59@...eos.com>
> ---
> Documentation/sound/alsa/HD-Audio.txt | 5 +++--
> sound/pci/hda/hda_codec.c | 28 ++++++++++++++++++++--------
> sound/pci/hda/hda_codec.h | 19 ++++---------------
> sound/pci/hda/hda_controller.c | 6 +++---
> sound/pci/hda/hda_controller.h | 2 +-
> sound/pci/hda/hda_intel.c | 7 +++----
> sound/pci/hda/hda_sysfs.c | 30 ++++++++++++++++++++++++++++++
> sound/pci/hda/hda_tegra.c | 4 ++--
> 8 files changed, 66 insertions(+), 35 deletions(-)
>
> diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt
> index 42a0a39..99f2fb8 100644
> --- a/Documentation/sound/alsa/HD-Audio.txt
> +++ b/Documentation/sound/alsa/HD-Audio.txt
> @@ -569,8 +569,9 @@ Power-Saving
> The power-saving is a kind of auto-suspend of the device. When the
> device is inactive for a certain time, the device is automatically
> turned off to save the power. The time to go down is specified via
> -`power_save` module option, and this option can be changed dynamically
> -via sysfs.
> +`power_save` module option. This option can be changed dynamically
> +via sysfs, either globally (via /sys/module/snd_hda_*/parameters/power_save)
> +or per-codec (via the power_save sysfs parameter in the codec directory)
>
> The power-saving won't work when the analog loopback is enabled on
> some codecs. Make sure that you mute all unneeded signal routes when
> diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
> index 2fe86d2..5e8394a 100644
> --- a/sound/pci/hda/hda_codec.c
> +++ b/sound/pci/hda/hda_codec.c
> @@ -895,7 +895,6 @@ int snd_hda_bus_new(struct snd_card *card,
> bus->private_data = temp->private_data;
> bus->pci = temp->pci;
> bus->modelname = temp->modelname;
> - bus->power_save = temp->power_save;
> bus->ops = temp->ops;
>
> mutex_init(&bus->cmd_mutex);
> @@ -1436,8 +1435,9 @@ static void snd_hda_codec_dev_release(struct device *dev)
> * Returns 0 if successful, or a negative error code.
> */
> int snd_hda_codec_new(struct hda_bus *bus,
> - unsigned int codec_addr,
> - struct hda_codec **codecp)
> + unsigned int codec_addr,
> + struct hda_codec **codecp,
> + int power_save)
> {
> struct hda_codec *codec;
> char component[31];
> @@ -1495,6 +1495,7 @@ int snd_hda_codec_new(struct hda_bus *bus,
>
> INIT_DELAYED_WORK(&codec->jackpoll_work, hda_jackpoll_work);
> codec->depop_delay = -1;
> + codec->power_save = power_save;
> codec->fixup_id = HDA_FIXUP_ID_NOT_SET;
>
> #ifdef CONFIG_PM
> @@ -5112,23 +5113,34 @@ static void __snd_hda_power_up(struct hda_codec *codec, bool wait_power_down)
> codec->power_transition = 0;
> }
>
> -#define power_save(codec) \
> - ((codec)->bus->power_save ? *(codec)->bus->power_save : 0)
> -
> /* Transition to powered down */
> static void __snd_hda_power_down(struct hda_codec *codec)
> {
> if (!codec->power_on || codec->power_count || codec->power_transition)
> return;
>
> - if (power_save(codec)) {
> + if (codec->power_save >= 0) {
> codec->power_transition = -1; /* avoid reentrance */
> queue_delayed_work(codec->bus->workq, &codec->power_work,
> - msecs_to_jiffies(power_save(codec) * 1000));
> + msecs_to_jiffies(codec->power_save * 1000));
> }
> }
>
> /**
> + *
> + * snd_hda_power_save_set - set the power-down time for the codec
> + *
> + * @codec: HD-audio codec
> + * @value: seconds to wait before powering down the codec
> + */
> +void snd_hda_power_save_set(struct hda_codec *codec, int value)
> +{
> + codec->power_save = value;
> + snd_hda_power_save(codec, 0, false);
> +}
> +EXPORT_SYMBOL_GPL(snd_hda_power_save_set);
> +
> +/**
> * snd_hda_power_save - Power-up/down/sync the codec
> * @codec: HD-audio codec
> * @delta: the counter delta to change
> diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
> index 9c8820f..faaab58 100644
> --- a/sound/pci/hda/hda_codec.h
> +++ b/sound/pci/hda/hda_codec.h
> @@ -106,7 +106,6 @@ struct hda_bus_template {
> void *private_data;
> struct pci_dev *pci;
> const char *modelname;
> - int *power_save;
> struct hda_bus_ops ops;
> };
>
> @@ -123,7 +122,6 @@ struct hda_bus {
> void *private_data;
> struct pci_dev *pci;
> const char *modelname;
> - int *power_save;
> struct hda_bus_ops ops;
>
> /* codec linked list */
> @@ -398,6 +396,7 @@ struct hda_codec {
> struct snd_array jacks;
> #endif
>
> + int power_save;
> int depop_delay; /* depop delay in ms, -1 for default delay time */
>
> /* fix-up list */
> @@ -423,7 +422,7 @@ enum {
> int snd_hda_bus_new(struct snd_card *card, const struct hda_bus_template *temp,
> struct hda_bus **busp);
> int snd_hda_codec_new(struct hda_bus *bus, unsigned int codec_addr,
> - struct hda_codec **codecp);
> + struct hda_codec **codecp, int power_save);
> int snd_hda_codec_configure(struct hda_codec *codec);
> int snd_hda_codec_update_widgets(struct hda_codec *codec);
>
> @@ -588,9 +587,11 @@ const char *snd_hda_get_jack_location(u32 cfg);
> * power saving
> */
> #ifdef CONFIG_PM
> +void snd_hda_power_save_set(struct hda_codec *codec, int value);
> void snd_hda_power_save(struct hda_codec *codec, int delta, bool d3wait);
> void snd_hda_update_power_acct(struct hda_codec *codec);
> #else
> +static inline void snd_hda_power_save_set(struct hda_codec *codec, int value) {}
> static inline void snd_hda_power_save(struct hda_codec *codec, int delta,
> bool d3wait) {}
> #endif
> @@ -634,18 +635,6 @@ static inline void snd_hda_power_down(struct hda_codec *codec)
> snd_hda_power_save(codec, -1, false);
> }
>
> -/**
> - * snd_hda_power_sync - Synchronize the power-save status
> - * @codec: HD-audio codec
> - *
> - * Synchronize the actual power state with the power account;
> - * called when power_save parameter is changed
> - */
> -static inline void snd_hda_power_sync(struct hda_codec *codec)
> -{
> - snd_hda_power_save(codec, 0, false);
> -}
> -
> #ifdef CONFIG_SND_HDA_PATCH_LOADER
> /*
> * patch firmware
> diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
> index 17c2637..4bb13ae 100644
> --- a/sound/pci/hda/hda_controller.c
> +++ b/sound/pci/hda/hda_controller.c
> @@ -1813,7 +1813,7 @@ static int get_jackpoll_interval(struct azx *chip)
> /* Codec initialization */
> int azx_codec_create(struct azx *chip, const char *model,
> unsigned int max_slots,
> - int *power_save_to)
> + int power_save)
> {
> struct hda_bus_template bus_temp;
> int c, codecs, err;
> @@ -1827,7 +1827,6 @@ int azx_codec_create(struct azx *chip, const char *model,
> bus_temp.ops.attach_pcm = azx_attach_pcm_stream;
> bus_temp.ops.bus_reset = azx_bus_reset;
> #ifdef CONFIG_PM
> - bus_temp.power_save = power_save_to;
> bus_temp.ops.pm_notify = azx_power_notify;
> #endif
> #ifdef CONFIG_SND_HDA_DSP_LOADER
> @@ -1886,7 +1885,8 @@ int azx_codec_create(struct azx *chip, const char *model,
> for (c = 0; c < max_slots; c++) {
> if ((chip->codec_mask & (1 << c)) & chip->codec_probe_mask) {
> struct hda_codec *codec;
> - err = snd_hda_codec_new(chip->bus, c, &codec);
> + err = snd_hda_codec_new(chip->bus, c, &codec,
> + power_save);
> if (err < 0)
> continue;
> codec->jackpoll_interval = get_jackpoll_interval(chip);
> diff --git a/sound/pci/hda/hda_controller.h b/sound/pci/hda/hda_controller.h
> index c90d10f..d187121 100644
> --- a/sound/pci/hda/hda_controller.h
> +++ b/sound/pci/hda/hda_controller.h
> @@ -45,7 +45,7 @@ irqreturn_t azx_interrupt(int irq, void *dev_id);
> /* Codec interface */
> int azx_codec_create(struct azx *chip, const char *model,
> unsigned int max_slots,
> - int *power_save_to);
> + int power_save);
> int azx_codec_configure(struct azx *chip);
> int azx_mixer_create(struct azx *chip);
> int azx_init_stream(struct azx *chip);
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index a8a1e14..d51779a 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -174,7 +174,6 @@ static struct kernel_param_ops param_ops_xint = {
> #define param_check_xint param_check_int
>
> static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
> -static int *power_save_addr = &power_save;
> module_param(power_save, xint, 0644);
> MODULE_PARM_DESC(power_save, "Automatic power-saving timeout "
> "(in second, 0 = disable).");
> @@ -187,7 +186,7 @@ static bool power_save_controller = 1;
> module_param(power_save_controller, bool, 0644);
> MODULE_PARM_DESC(power_save_controller, "Reset controller in power save mode.");
> #else
> -static int *power_save_addr;
> +static int power_save = -1;
> #endif /* CONFIG_PM */
>
> static int align_buffer_size = -1;
> @@ -754,7 +753,7 @@ static int param_set_xint(const char *val, const struct kernel_param *kp)
> if (!chip->bus || chip->disabled)
> continue;
> list_for_each_entry(c, &chip->bus->codec_list, list)
> - snd_hda_power_sync(c);
> + snd_hda_power_save_set(c, power_save);
> }
> mutex_unlock(&card_list_lock);
> return 0;
> @@ -1898,7 +1897,7 @@ static int azx_probe_continue(struct azx *chip)
> /* create codec instances */
> err = azx_codec_create(chip, model[dev],
> azx_max_codecs[chip->driver_type],
> - power_save_addr);
> + power_save);
>
> if (err < 0)
> goto out_free;
> diff --git a/sound/pci/hda/hda_sysfs.c b/sound/pci/hda/hda_sysfs.c
> index ccc962a..69bbb0b 100644
> --- a/sound/pci/hda/hda_sysfs.c
> +++ b/sound/pci/hda/hda_sysfs.c
> @@ -44,8 +44,37 @@ static ssize_t power_off_acct_show(struct device *dev,
> return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
> }
>
> +static ssize_t power_save_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct hda_codec *codec = dev_get_drvdata(dev);
> +
> + return sprintf(buf, "%d\n", jiffies_to_msecs(codec->power_save));
> +}
> +
> +static ssize_t power_save_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct hda_codec *codec = dev_get_drvdata(dev);
> + unsigned long val;
> + int err = kstrtol(buf, 0, &val);
> +
> + if (err < 0)
> + return err;
> +
> + if (val < -1)
> + return -EINVAL;
> +
> + snd_hda_power_save_set(codec, val);
> + return count;
> +}
> +
> static DEVICE_ATTR_RO(power_on_acct);
> static DEVICE_ATTR_RO(power_off_acct);
> +static DEVICE_ATTR_RW(power_save);
> +
> #endif /* CONFIG_PM */
>
> #define CODEC_INFO_SHOW(type) \
> @@ -759,6 +788,7 @@ static struct attribute *hda_dev_attrs[] = {
> #ifdef CONFIG_PM
> &dev_attr_power_on_acct.attr,
> &dev_attr_power_off_acct.attr,
> + &dev_attr_power_save.attr,
> #endif
> #ifdef CONFIG_SND_HDA_RECONFIG
> &dev_attr_init_verbs.attr,
> diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
> index 375e94f..69b76fc 100644
> --- a/sound/pci/hda/hda_tegra.c
> +++ b/sound/pci/hda/hda_tegra.c
> @@ -82,7 +82,7 @@ module_param(power_save, bint, 0644);
> MODULE_PARM_DESC(power_save,
> "Automatic power-saving timeout (in seconds, 0 = disable).");
> #else
> -static int power_save = 0;
> +static int power_save = -1;
> #endif
>
> /*
> @@ -503,7 +503,7 @@ static int hda_tegra_probe(struct platform_device *pdev)
> goto out_free;
>
> /* create codec instances */
> - err = azx_codec_create(chip, NULL, 0, &power_save);
> + err = azx_codec_create(chip, NULL, 0, power_save);
> if (err < 0)
> goto out_free;
>
> --
> 2.3.4
>
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