[alsa-devel] [PATCH 2/3] ASoC: Intel: Skylake: Fix dma buffer size calculation

[Subhransu S. Prusty]

From: Ramesh Babu <ramesh.babu at intel.com>

DMA buffer size for gateway copier will be calculated based on:

For host DMA copier:
Input buffer size (ibs) for output direction (playback)
Output buffer size (obs) for input direction (capture)

For link DMA copier:
IBS for input direction (capture)
OBS for output direction (playback)

Update the driver to use the above.

Signed-off-by: Ramesh Babu <ramesh.babu at intel.com>
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty at intel.com>
---
 sound/soc/intel/skylake/skl-messages.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-messages.c b/sound/soc/intel/skylake/skl-messages.c
index ab1adc0c9cc3..7063b451b109 100644
--- a/sound/soc/intel/skylake/skl-messages.c
+++ b/sound/soc/intel/skylake/skl-messages.c
@@ -507,6 +507,8 @@ static void skl_setup_cpr_gateway_cfg(struct skl_sst *ctx,
 			struct skl_module_cfg *mconfig,
 			struct skl_cpr_cfg *cpr_mconfig)
 {
+	u32 dma_io_buf;
+
 	cpr_mconfig->gtw_cfg.node_id = skl_get_node_id(ctx, mconfig);
 
 	if (cpr_mconfig->gtw_cfg.node_id == SKL_NON_GATEWAY_CPR_NODE_ID) {
@@ -514,10 +516,29 @@ static void skl_setup_cpr_gateway_cfg(struct skl_sst *ctx,
 		return;
 	}
 
-	if (SKL_CONN_SOURCE == mconfig->hw_conn_type)
-		cpr_mconfig->gtw_cfg.dma_buffer_size = 2 * mconfig->obs;
-	else
-		cpr_mconfig->gtw_cfg.dma_buffer_size = 2 * mconfig->ibs;
+	switch (mconfig->hw_conn_type) {
+	case SKL_CONN_SOURCE:
+		if (mconfig->dev_type == SKL_DEVICE_HDAHOST)
+			dma_io_buf =  mconfig->ibs;
+		else
+			dma_io_buf =  mconfig->obs;
+		break;
+
+	case SKL_CONN_SINK:
+		if (mconfig->dev_type == SKL_DEVICE_HDAHOST)
+			dma_io_buf =  mconfig->obs;
+		else
+			dma_io_buf =  mconfig->ibs;
+		break;
+
+	default:
+		dev_warn(ctx->dev, "wrong connection type: %d\n",
+				mconfig->hw_conn_type);
+		return;
+	}
+
+	cpr_mconfig->gtw_cfg.dma_buffer_size =
+				mconfig->dma_buffer_size * dma_io_buf;
 
 	cpr_mconfig->cpr_feature_mask = 0;
 	cpr_mconfig->gtw_cfg.config_length  = 0;
-- 
1.9.1