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PM QOS update

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This patch changes the string based list management to a handle base
implementation to help with the hot path use of pm-qos, it also renames
much of the API to use "request" as opposed to "requirement" that was
used in the initial implementation.  I did this because request more
accurately represents what it actually does.

Also, I added a string based ABI for users wanting to use a string
interface.  So if the user writes 0xDDDDDDDD formatted hex it will be
accepted by the interface.  (someone asked me for it and I don't think
it hurts anything.)

This patch updates some documentation input I got from Randy.

Signed-off-by: markgross <mgross@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Mark Gross
2010-05-06 01:59:26 +02:00
committed by Rafael J. Wysocki
parent 0fef8b1e83
commit ed77134bfc
14 changed files with 175 additions and 170 deletions
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14
sound/core/pcm_native.c
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@@ -481,11 +481,13 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
snd_pcm_timer_resolution_change(substream);
runtime->status->state = SNDRV_PCM_STATE_SETUP;
pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
substream->latency_id);
if (substream->latency_pm_qos_req) {
pm_qos_remove_request(substream->latency_pm_qos_req);
substream->latency_pm_qos_req = NULL;
}
if ((usecs = period_to_usecs(runtime)) >= 0)
pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
substream->latency_id, usecs);
substream->latency_pm_qos_req = pm_qos_add_request(
PM_QOS_CPU_DMA_LATENCY, usecs);
return 0;
_error:
/* hardware might be unuseable from this time,
@@ -540,8 +542,8 @@ static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
if (substream->ops->hw_free)
result = substream->ops->hw_free(substream);
runtime->status->state = SNDRV_PCM_STATE_OPEN;
pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
substream->latency_id);
pm_qos_remove_request(substream->latency_pm_qos_req);
substream->latency_pm_qos_req = NULL;
return result;
}