[alsa-devel] [PATCH 7/7] ASoC: Intel: Skylake: Strip T and L from TLV IPCs

[cezary.rojewski at intel.com]

From: Kamil Lulko <kamilx.lulko at intel.com>

cAVS modules do not require Type and Length header within the
set_module_params IPC. This is also true for Vendor modules. The
userspace (like tinymix) always appends this header to TLV controls
which are used for set_module_params. Simply assume this header is
always present in the payload and omit it from the IPC.

Signed-off-by: Kamil Lulko <kamilx.lulko at intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski at intel.com>
---
 sound/soc/intel/skylake/skl-topology.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-topology.c b/sound/soc/intel/skylake/skl-topology.c
index c69d999d7bf1..76e971b8536a 100644
--- a/sound/soc/intel/skylake/skl-topology.c
+++ b/sound/soc/intel/skylake/skl-topology.c
@@ -1492,22 +1492,18 @@ static int skl_tplg_tlv_control_set(struct snd_kcontrol *kcontrol,
 	struct skl *skl = get_skl_ctx(w->dapm->dev);
 
 	if (ac->params) {
+		/*
+		 * Widget data is expected to be stripped of T and L
+		 */
+		size -= 2 * sizeof(unsigned int);
+		data += 2;
+
 		if (size > ac->max)
 			return -EINVAL;
-
 		ac->size = size;
-		/*
-		 * if the param_is is of type Vendor, firmware expects actual
-		 * parameter id and size from the control.
-		 */
-		if (ac->param_id == SKL_PARAM_VENDOR_ID) {
-			if (copy_from_user(ac->params, data, size))
-				return -EFAULT;
-		} else {
-			if (copy_from_user(ac->params,
-					   data + 2, size))
-				return -EFAULT;
-		}
+
+		if (copy_from_user(ac->params, data, size))
+			return -EFAULT;
 
 		if (w->power)
 			return skl_set_module_params(skl->skl_sst,
-- 
2.17.1