ALSA: rme96: Add PM support v3

Without proper power management handling, the first use
of a Digi96/8 anytime after a suspend / resume cycle will
start playback with distortions.

v3: Abort if vmalloc() of suspend buffers fail, but do not
leak memory in that case.

[fixed wrong memory leak fix again -- tiwai]

Signed-off-by: Knut Petersen <Knut_Petersen@t-online.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 117 insertions, 0 deletions

diff --git a/sound/pci/rme96.c b/sound/pci/rme96.c
index 4e9a5563eeca..0506530de5a5 100644
--- a/sound/pci/rme96.c
+++ b/sound/pci/rme96.c
@@ -239,6 +239,13 @@ struct rme96 {
 
         u8 rev; /* card revision number */
 
+#ifdef CONFIG_PM
+        u32 playback_pointer;
+        u32 capture_pointer;
+        void *playback_suspend_buffer;
+        void *capture_suspend_buffer;
+#endif
+
         struct snd_pcm_substream *playback_substream;
         struct snd_pcm_substream *capture_substream;
 
@@ -370,6 +377,7 @@ static struct snd_pcm_hardware snd_rme96_playback_spdif_info =
         .info =              (SNDRV_PCM_INFO_MMAP_IOMEM |
                               SNDRV_PCM_INFO_MMAP_VALID |
                               SNDRV_PCM_INFO_SYNC_START |
+                              SNDRV_PCM_INFO_RESUME |
                               SNDRV_PCM_INFO_INTERLEAVED |
                               SNDRV_PCM_INFO_PAUSE),
         .formats =           (SNDRV_PCM_FMTBIT_S16_LE |
@@ -400,6 +408,7 @@ static struct snd_pcm_hardware snd_rme96_capture_spdif_info =
         .info =              (SNDRV_PCM_INFO_MMAP_IOMEM |
                               SNDRV_PCM_INFO_MMAP_VALID |
                               SNDRV_PCM_INFO_SYNC_START |
+                              SNDRV_PCM_INFO_RESUME |
                               SNDRV_PCM_INFO_INTERLEAVED |
                               SNDRV_PCM_INFO_PAUSE),
         .formats =           (SNDRV_PCM_FMTBIT_S16_LE |
@@ -430,6 +439,7 @@ static struct snd_pcm_hardware snd_rme96_playback_adat_info =
         .info =              (SNDRV_PCM_INFO_MMAP_IOMEM |
                               SNDRV_PCM_INFO_MMAP_VALID |
                               SNDRV_PCM_INFO_SYNC_START |
+                              SNDRV_PCM_INFO_RESUME |
                               SNDRV_PCM_INFO_INTERLEAVED |
                               SNDRV_PCM_INFO_PAUSE),
         .formats =           (SNDRV_PCM_FMTBIT_S16_LE |
@@ -456,6 +466,7 @@ static struct snd_pcm_hardware snd_rme96_capture_adat_info =
         .info =              (SNDRV_PCM_INFO_MMAP_IOMEM |
                               SNDRV_PCM_INFO_MMAP_VALID |
                               SNDRV_PCM_INFO_SYNC_START |
+                              SNDRV_PCM_INFO_RESUME |
                               SNDRV_PCM_INFO_INTERLEAVED |
                               SNDRV_PCM_INFO_PAUSE),
         .formats =           (SNDRV_PCM_FMTBIT_S16_LE |
@@ -1386,6 +1397,7 @@ snd_rme96_playback_trigger(struct snd_pcm_substream *substream,
                 }
                 break;
 
+        case SNDRV_PCM_TRIGGER_SUSPEND:
         case SNDRV_PCM_TRIGGER_STOP:
                 if (RME96_ISPLAYING(rme96)) {
                         if (substream != rme96->playback_substream)
@@ -1401,6 +1413,7 @@ snd_rme96_playback_trigger(struct snd_pcm_substream *substream,
                                                  : RME96_STOP_PLAYBACK);
                 break;
 
+        case SNDRV_PCM_TRIGGER_RESUME:
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                 if (!RME96_ISPLAYING(rme96))
                         snd_rme96_trigger(rme96, sync ? RME96_RESUME_BOTH
@@ -1441,6 +1454,7 @@ snd_rme96_capture_trigger(struct snd_pcm_substream *substream,
                 }
                 break;
 
+        case SNDRV_PCM_TRIGGER_SUSPEND:
         case SNDRV_PCM_TRIGGER_STOP:
                 if (RME96_ISRECORDING(rme96)) {
                         if (substream != rme96->capture_substream)
@@ -1456,6 +1470,7 @@ snd_rme96_capture_trigger(struct snd_pcm_substream *substream,
                                                  : RME96_STOP_CAPTURE);
                 break;
 
+        case SNDRV_PCM_TRIGGER_RESUME:
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                 if (!RME96_ISRECORDING(rme96))
                         snd_rme96_trigger(rme96, sync ? RME96_RESUME_BOTH
@@ -1556,6 +1571,10 @@ snd_rme96_free(void *private_data)
                 pci_release_regions(rme96->pci);
                 rme96->port = 0;
         }
+#ifdef CONFIG_PM
+        vfree(rme96->playback_suspend_buffer);
+        vfree(rme96->capture_suspend_buffer);
+#endif
         pci_disable_device(rme96->pci);
 }
 
@@ -2354,6 +2373,83 @@ snd_rme96_create_switches(struct snd_card *card,
  * Card initialisation
  */
 
+#ifdef CONFIG_PM
+
+static int
+snd_rme96_suspend(struct pci_dev *pci,
+                  pm_message_t state)
+{
+        struct snd_card *card = pci_get_drvdata(pci);
+        struct rme96 *rme96 = card->private_data;
+
+        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+        snd_pcm_suspend(rme96->playback_substream);
+        snd_pcm_suspend(rme96->capture_substream);
+
+        /* save capture & playback pointers */
+        rme96->playback_pointer = readl(rme96->iobase + RME96_IO_GET_PLAY_POS)
+                                  & RME96_RCR_AUDIO_ADDR_MASK;
+        rme96->capture_pointer = readl(rme96->iobase + RME96_IO_GET_REC_POS)
+                                 & RME96_RCR_AUDIO_ADDR_MASK;
+
+        /* save playback and capture buffers */
+        memcpy_fromio(rme96->playback_suspend_buffer,
+                      rme96->iobase + RME96_IO_PLAY_BUFFER, RME96_BUFFER_SIZE);
+        memcpy_fromio(rme96->capture_suspend_buffer,
+                      rme96->iobase + RME96_IO_REC_BUFFER, RME96_BUFFER_SIZE);
+
+        /* disable the DAC  */
+        rme96->areg &= ~RME96_AR_DAC_EN;
+        writel(rme96->areg, rme96->iobase + RME96_IO_ADDITIONAL_REG);
+
+        pci_disable_device(pci);
+        pci_save_state(pci);
+
+        return 0;
+}
+
+static int
+snd_rme96_resume(struct pci_dev *pci)
+{
+        struct snd_card *card = pci_get_drvdata(pci);
+        struct rme96 *rme96 = card->private_data;
+
+        pci_restore_state(pci);
+        pci_enable_device(pci);
+
+        /* reset playback and record buffer pointers */
+        writel(0, rme96->iobase + RME96_IO_SET_PLAY_POS
+                  + rme96->playback_pointer);
+        writel(0, rme96->iobase + RME96_IO_SET_REC_POS
+                  + rme96->capture_pointer);
+
+        /* restore playback and capture buffers */
+        memcpy_toio(rme96->iobase + RME96_IO_PLAY_BUFFER,
+                    rme96->playback_suspend_buffer, RME96_BUFFER_SIZE);
+        memcpy_toio(rme96->iobase + RME96_IO_REC_BUFFER,
+                    rme96->capture_suspend_buffer, RME96_BUFFER_SIZE);
+
+        /* reset the ADC */
+        writel(rme96->areg | RME96_AR_PD2,
+               rme96->iobase + RME96_IO_ADDITIONAL_REG);
+        writel(rme96->areg, rme96->iobase + RME96_IO_ADDITIONAL_REG);
+
+        /* reset and enable DAC, restore analog volume */
+        snd_rme96_reset_dac(rme96);
+        rme96->areg |= RME96_AR_DAC_EN;
+        writel(rme96->areg, rme96->iobase + RME96_IO_ADDITIONAL_REG);
+        if (RME96_HAS_ANALOG_OUT(rme96)) {
+                usleep_range(3000, 10000);
+                snd_rme96_apply_dac_volume(rme96);
+        }
+
+        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+
+        return 0;
+}
+