ALSA: hda_controller: Separate stream_tag for input and output streams.

Implemented separate stream_tag assignment for input and output streams.
According to hda specification stream tag must be unique throughout the
input streams group, however an output stream might use a stream tag
which is already in use by an input stream. This change is necessary
to support HW which provides a total of more than 15 stream DMA engines
which with legacy implementation causes an overflow on SDxCTL.STRM
field (and the whole SDxCTL register) and as a result usage of
Reserved value 0 in the SDxCTL.STRM field which confuses HDA controller.

Signed-off-by: Rafal Redzimski <rafal.f.redzimski@intel.com>
Signed-off-by: Jayachandran B <jayachandran.b@intel.com>
Signed-off-by: Libin Yang <libin.yang@intel.com>
Reviewed-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
index 8276a74..0cfc9c8 100644 (file)
--- a/sound/pci/hda/hda_controller.c
+++ b/sound/pci/hda/hda_controller.c
@@ -1922,10 +1922,18 @@ int azx_mixer_create(struct azx *chip)
 EXPORT_SYMBOL_GPL(azx_mixer_create);
 
 
+static bool is_input_stream(struct azx *chip, unsigned char index)
+{
+       return (index >= chip->capture_index_offset &&
+               index < chip->capture_index_offset + chip->capture_streams);
+}
+
 /* initialize SD streams */
 int azx_init_stream(struct azx *chip)
 {
        int i;
+       int in_stream_tag = 0;
+       int out_stream_tag = 0;
 
        /* initialize each stream (aka device)
         * assign the starting bdl address to each stream (device)
@@ -1938,9 +1946,21 @@ int azx_init_stream(struct azx *chip)
                azx_dev->sd_addr = chip->remap_addr + (0x20 * i + 0x80);
                /* int mask: SDI0=0x01, SDI1=0x02, ... SDO3=0x80 */
                azx_dev->sd_int_sta_mask = 1 << i;
-               /* stream tag: must be non-zero and unique */
                azx_dev->index = i;
-               azx_dev->stream_tag = i + 1;
+
+               /* stream tag must be unique throughout
+                * the stream direction group,
+                * valid values 1...15
+                * use separate stream tag if the flag
+                * AZX_DCAPS_SEPARATE_STREAM_TAG is used
+                */
+               if (chip->driver_caps & AZX_DCAPS_SEPARATE_STREAM_TAG)
+                       azx_dev->stream_tag =
+                               is_input_stream(chip, i) ?
+                               ++in_stream_tag :
+                               ++out_stream_tag;
+               else
+                       azx_dev->stream_tag = i + 1;
        }
 
        return 0;

diff --git a/sound/pci/hda/hda_priv.h b/sound/pci/hda/hda_priv.h
index aa484fd..166e3e8 100644 (file)
--- a/sound/pci/hda/hda_priv.h
+++ b/sound/pci/hda/hda_priv.h
@@ -171,6 +171,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
 #define AZX_DCAPS_I915_POWERWELL (1 << 27)     /* HSW i915 powerwell support */
 #define AZX_DCAPS_CORBRP_SELF_CLEAR (1 << 28)  /* CORBRP clears itself after reset */
 #define AZX_DCAPS_NO_MSI64      (1 << 29)      /* Stick to 32-bit MSIs */
+#define AZX_DCAPS_SEPARATE_STREAM_TAG  (1 << 30) /* capture and playback use separate stream tag */
 
 enum {
        AZX_SNOOP_TYPE_NONE ,