[ARM] tegra_spdif_audio: add suspend wakelocks

Signed-off-by: Iliyan Malchev <malchev@google.com>

diff --git a/arch/arm/mach-tegra/tegra_spdif_audio.c b/arch/arm/mach-tegra/tegra_spdif_audio.c
index 9c6ae5b6f41ae22679bc43bf3d0e593090f2809e..9f719e392deb0f07f68d5896c878612ceec719d9 100644 (file)
--- a/arch/arm/mach-tegra/tegra_spdif_audio.c
+++ b/arch/arm/mach-tegra/tegra_spdif_audio.c
@@ -44,6 +44,7 @@
 #include <linux/ktime.h>
 #include <linux/sysfs.h>
 #include <linux/pm_qos_params.h>
+#include <linux/wakelock.h>
 #include <linux/delay.h>
 #include <linux/tegra_audio.h>
 
@@ -88,6 +89,8 @@ struct audio_stream {
        struct tegra_dma_req dma_req;
 
        struct pm_qos_request_list pm_qos;
+       struct wake_lock wake_lock;
+       char wake_lock_name[100];
 };
 
 struct spdif_pio_stats {
@@ -162,6 +165,7 @@ static inline struct audio_driver_state *ads_from_out(
 static inline void prevent_suspend(struct audio_stream *as)
 {
        pr_debug("%s\n", __func__);
+       wake_lock(&as->wake_lock);
        pm_qos_update_request(&as->pm_qos, 0);
 }
 
@@ -169,6 +173,7 @@ static inline void allow_suspend(struct audio_stream *as)
 {
        pr_debug("%s\n", __func__);
        pm_qos_update_request(&as->pm_qos, PM_QOS_DEFAULT_VALUE);
+       wake_unlock(&as->wake_lock);
 }
 
 #define I2S_I2S_FIFO_TX_BUSY   I2S_I2S_STATUS_FIFO1_BSY
@@ -986,6 +991,8 @@ static int tegra_spdif_out_release(struct inode *inode, struct file *file)
        if (!ads->out.opened) {
                stop_playback_if_necessary(&ads->out);
 
+               if (wake_lock_active(&ads->out.wake_lock))
+                       pr_err("%s: wake lock is still held!\n", __func__);
                if (kfifo_len(&ads->out.fifo))
                        pr_err("%s: output fifo is not empty (%d bytes left)\n",
                                __func__, kfifo_len(&ads->out.fifo));
@@ -1336,6 +1343,10 @@ static int tegra_spdif_probe(struct platform_device *pdev)
 
        pm_qos_add_request(&state->out.pm_qos, PM_QOS_CPU_DMA_LATENCY,
                                PM_QOS_DEFAULT_VALUE);
+       snprintf(state->out.wake_lock_name, sizeof(state->out.wake_lock_name),
+               "tegra-audio-spdif");
+       wake_lock_init(&state->out.wake_lock, WAKE_LOCK_SUSPEND,
+                       state->out.wake_lock_name);
 
        if (request_irq(state->irq, spdif_interrupt,
                        IRQF_DISABLED, state->pdev->name, state) < 0) {