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[ARM] tegra_i2s_audio: use pm_qos to prevent DMA-callback delays

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Signed-off-by: Iliyan Malchev <malchev@google.com>
This commit is contained in:
Iliyan Malchev
2010-10-02 17:31:54 -07:00
committed by Colin Cross
parent d7675db725
commit d25a67d8d2
1 changed files with 27 additions and 0 deletions
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27
arch/arm/mach-tegra/tegra_i2s_audio.c
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@@ -40,6 +40,7 @@
#include <linux/io.h>
#include <linux/ktime.h>
#include <linux/sysfs.h>
#include <linux/pm_qos_params.h>
#include <linux/tegra_audio.h>
@@ -81,6 +82,8 @@ struct audio_stream {
spinlock_t dma_req_lock; /* guards dma_has_it */
int dma_has_it;
struct tegra_dma_req dma_req;
struct pm_qos_request_list *pm_qos;
};
struct i2s_pio_stats {
@@ -527,6 +530,8 @@ static int start_playback(struct audio_stream *aos)
pr_debug("%s: starting playback\n", __func__);
rc = sound_ops->start_playback(aos);
spin_unlock_irqrestore(&aos->dma_req_lock, flags);
if (!rc)
pm_qos_update_request(aos->pm_qos, 0);
return rc;
}
@@ -542,6 +547,8 @@ static int start_recording_if_necessary(struct audio_stream *ais)
rc = sound_ops->start_recording(ais);
}
spin_unlock_irqrestore(&ais->dma_req_lock, flags);
if (!rc)
pm_qos_update_request(ais->pm_qos, 0);
return rc;
}
@@ -554,6 +561,7 @@ static bool stop_playback_if_necessary(struct audio_stream *aos)
if (aos->active)
aos->errors++;
spin_unlock_irqrestore(&aos->dma_req_lock, flags);
pm_qos_update_request(aos->pm_qos, PM_QOS_DEFAULT_VALUE);
return true;
}
spin_unlock_irqrestore(&aos->dma_req_lock, flags);
@@ -582,6 +590,7 @@ static bool stop_recording(struct audio_stream *ais)
rc = wait_for_completion_interruptible(
&ais->stop_completion);
pr_debug("%s: done: %d\n", __func__, rc);
pm_qos_update_request(ais->pm_qos, PM_QOS_DEFAULT_VALUE);
return true;
}
@@ -2175,6 +2184,24 @@ static int tegra_audio_probe(struct platform_device *pdev)
if (rc < 0)
return rc;
state->in.pm_qos = pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
PM_QOS_DEFAULT_VALUE);
if (!state->in.pm_qos) {
dev_err(&pdev->dev,
"%s: could not register pm_qos handle for input\n",
__func__);
return -EIO;
}
state->out.pm_qos = pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
PM_QOS_DEFAULT_VALUE);
if (!state->out.pm_qos) {
dev_err(&pdev->dev,
"%s: could not register pm_qos handle for output\n",
__func__);
return -EIO;
}
if (request_irq(state->irq, i2s_interrupt,
IRQF_DISABLED, state->pdev->name, state) < 0) {
dev_err(&pdev->dev,