ALSA: hda - Add position_check op

This op will be used by hda_intel to do the position check.  Takashi
wisely suggested adding this before moving the interrupt handler to
common HDA code.  Having this callback prevents the need to move the
hda_intel specific delayed interrupt handling with the irq.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 23 insertions, 9 deletions

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 4f693eff531a..53e4b40a72af 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -416,6 +416,23 @@ static void azx_init_pci(struct azx *chip)
 
 static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev);
 
+/* called from IRQ */
+static int azx_position_check(struct azx *chip, struct azx_dev *azx_dev)
+{
+        int ok;
+
+        ok = azx_position_ok(chip, azx_dev);
+        if (ok == 1) {
+                azx_dev->irq_pending = 0;
+                return ok;
+        } else if (ok == 0 && chip->bus && chip->bus->workq) {
+                /* bogus IRQ, process it later */
+                azx_dev->irq_pending = 1;
+                queue_work(chip->bus->workq, &chip->irq_pending_work);
+        }
+        return 0;
+}
+
 /*
  * interrupt handler
  */
@@ -425,7 +442,7 @@ static irqreturn_t azx_interrupt(int irq, void *dev_id)
         struct azx_dev *azx_dev;
         u32 status;
         u8 sd_status;
-        int i, ok;
+        int i;
 
 #ifdef CONFIG_PM_RUNTIME
         if (chip->driver_caps & AZX_DCAPS_PM_RUNTIME)
@@ -455,17 +472,11 @@ static irqreturn_t azx_interrupt(int irq, void *dev_id)
                             !(sd_status & SD_INT_COMPLETE))
                                 continue;
                         /* check whether this IRQ is really acceptable */
-                        ok = azx_position_ok(chip, azx_dev);
-                        if (ok == 1) {
-                                azx_dev->irq_pending = 0;
+                        if (!chip->ops->position_check ||
+                            chip->ops->position_check(chip, azx_dev)) {
                                 spin_unlock(&chip->reg_lock);
                                 snd_pcm_period_elapsed(azx_dev->substream);
                                 spin_lock(&chip->reg_lock);
-                        } else if (ok == 0 && chip->bus && chip->bus->workq) {
-                                /* bogus IRQ, process it later */
-                                azx_dev->irq_pending = 1;
-                                queue_work(chip->bus->workq,
-                                           &chip->irq_pending_work);
                         }
                 }
         }
@@ -1821,6 +1832,7 @@ static const struct hda_controller_ops pci_hda_ops = {
         .substream_alloc_pages = substream_alloc_pages,
         .substream_free_pages = substream_free_pages,
         .pcm_mmap_prepare = pcm_mmap_prepare,
+        .position_check = azx_position_check,
 };
 
 static int azx_probe(struct pci_dev *pci,
diff --git a/sound/pci/hda/hda_priv.h b/sound/pci/hda/hda_priv.h
index edbe2ebac025..bf3cb33e0dd3 100644
--- a/sound/pci/hda/hda_priv.h
+++ b/sound/pci/hda/hda_priv.h
@@ -311,6 +311,8 @@ struct hda_controller_ops {
                                     struct snd_pcm_substream *substream);
         void (*pcm_mmap_prepare)(struct snd_pcm_substream *substream,
                                  struct vm_area_struct *area);
+        /* Check if current position is acceptable */
+        int (*position_check)(struct azx *chip, struct azx_dev *azx_dev);
 };
 
 struct azx_pcm {