ALSA: hdac: Add support for hda DMA Resume capability
Skylake sports new capability of DMA resume, DRSM where we can
resume the DMA. This capability is defined by presence of
AZX_DRSM_CAP_ID.
If this capability is present, we use this capability.
So we add:
snd_hdac_ext_stream_drsm_enable() - DMA resume caps
snd_hdac_ext_stream_set_dpibr() - set the DMA position
snd_hdac_ext_stream_set_lpib() - set the lpib
Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/include/sound/hda_register.h b/include/sound/hda_register.h
index 2ae8812..28ac1f9 100644
--- a/include/sound/hda_register.h
+++ b/include/sound/hda_register.h
@@ -230,6 +230,15 @@
#define AZX_MLCTL_SPA (1<<16)
#define AZX_MLCTL_CPA 23
+
+/* registers for DMA Resume Capability Structure */
+#define AZX_DRSM_CAP_ID 0x5
+#define AZX_REG_DRSM_CTL 0x4
+/* Base used to calculate the iterating register offset */
+#define AZX_DRSM_BASE 0x08
+/* Interval used to calculate the iterating register offset */
+#define AZX_DRSM_INTERVAL 0x08
+
/*
* helpers to read the stream position
*/