ASoC: topology: Support topology file of ABI v4

Users start to use topology ABI from v4. ABI v5 updated existing manifest
and PCM elements. Two previous patches can support these ABI updates in a
backward compatible way. So if the topology file from user space is
generated by ABI v4, kernel will no longer quit but continue parsing.

Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 5 insertions, 2 deletions

diff --git a/include/uapi/sound/asoc.h b/include/uapi/sound/asoc.h
index 8d9814b17c46..69cae7198b18 100644
--- a/include/uapi/sound/asoc.h
+++ b/include/uapi/sound/asoc.h
@@ -83,7 +83,8 @@
 #define SND_SOC_TPLG_NUM_TEXTS          16
 
 /* ABI version */
-#define SND_SOC_TPLG_ABI_VERSION        0x5
+#define SND_SOC_TPLG_ABI_VERSION        0x5     /* current version */
+#define SND_SOC_TPLG_ABI_VERSION_MIN    0x4     /* oldest version supported */
 
 /* Max size of TLV data */
 #define SND_SOC_TPLG_TLV_SIZE           32
diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 0f1c8ebf8cda..2f9b64ec5904 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -2056,7 +2056,9 @@ static int soc_valid_header(struct soc_tplg *tplg,
                 return -EINVAL;
         }
 
-        if (hdr->abi != SND_SOC_TPLG_ABI_VERSION) {
+        /* Support ABI from version 4 */
+        if (hdr->abi > SND_SOC_TPLG_ABI_VERSION
+                || hdr->abi < SND_SOC_TPLG_ABI_VERSION_MIN) {
                 dev_err(tplg->dev,
                         "ASoC: pass %d invalid ABI version got 0x%x need 0x%x at offset 0x%lx size 0x%zx.\n",
                         tplg->pass, hdr->abi,