ASoC: wm_adsp: Make compressed buffers optional

Newer firmwares will support compressed buffers that may or may not
exist, for example debugging streams. Update the driver to make a
compressed stream optional. A warning will still be generated at DSP
boot time and opening the stream will fail if the compressed buffer in
question does not exist, however the DSP can still be booted and other
features used.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220210172053.22782-2-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm_adsp.c

@@ -1373,8 +1373,6 @@ static struct wm_adsp_compr_buf *wm_adsp_buffer_alloc(struct wm_adsp *dsp)
 
 	wm_adsp_buffer_clear(buf);
 
-	list_add_tail(&buf->list, &dsp->buffer_list);
-
 	return buf;
 }
 
@@ -1391,10 +1389,6 @@ static int wm_adsp_buffer_parse_legacy(struct wm_adsp *dsp)
 		return -EINVAL;
 	}
 
-	buf = wm_adsp_buffer_alloc(dsp);
-	if (!buf)
-		return -ENOMEM;
-
 	xmalg = dsp->sys_config_size / sizeof(__be32);
 
 	addr = alg_region->base + xmalg + ALG_XM_FIELD(magic);
@@ -1405,12 +1399,16 @@ static int wm_adsp_buffer_parse_legacy(struct wm_adsp *dsp)
 	if (magic != WM_ADSP_ALG_XM_STRUCT_MAGIC)
 		return -ENODEV;
 
+	buf = wm_adsp_buffer_alloc(dsp);
+	if (!buf)
+		return -ENOMEM;
+
 	addr = alg_region->base + xmalg + ALG_XM_FIELD(host_buf_ptr);
 	for (i = 0; i < 5; ++i) {
 		ret = cs_dsp_read_data_word(&dsp->cs_dsp, WMFW_ADSP2_XM, addr,
 					    &buf->host_buf_ptr);
 		if (ret < 0)
-			return ret;
+			goto err;
 
 		if (buf->host_buf_ptr)
 			break;
@@ -1418,18 +1416,27 @@ static int wm_adsp_buffer_parse_legacy(struct wm_adsp *dsp)
 		usleep_range(1000, 2000);
 	}
 
-	if (!buf->host_buf_ptr)
-		return -EIO;
+	if (!buf->host_buf_ptr) {
+		ret = -EIO;
+		goto err;
+	}
 
 	buf->host_buf_mem_type = WMFW_ADSP2_XM;
 
 	ret = wm_adsp_buffer_populate(buf);
 	if (ret < 0)
-		return ret;
+		goto err;
+
+	list_add_tail(&buf->list, &dsp->buffer_list);
 
 	compr_dbg(buf, "legacy host_buf_ptr=%x\n", buf->host_buf_ptr);
 
 	return 0;
+
+err:
+	kfree(buf);
+
+	return ret;
 }
 
 static int wm_adsp_buffer_parse_coeff(struct cs_dsp_coeff_ctl *cs_ctl)
@@ -1437,7 +1444,7 @@ static int wm_adsp_buffer_parse_coeff(struct cs_dsp_coeff_ctl *cs_ctl)
 	struct wm_adsp_host_buf_coeff_v1 coeff_v1;
 	struct wm_adsp_compr_buf *buf;
 	struct wm_adsp *dsp = container_of(cs_ctl->dsp, struct wm_adsp, cs_dsp);
-	unsigned int version;
+	unsigned int version = 0;
 	int ret, i;
 
 	for (i = 0; i < 5; ++i) {
@@ -1465,16 +1472,14 @@ static int wm_adsp_buffer_parse_coeff(struct cs_dsp_coeff_ctl *cs_ctl)
 
 	ret = wm_adsp_buffer_populate(buf);
 	if (ret < 0)
-		return ret;
+		goto err;
 
 	/*
 	 * v0 host_buffer coefficients didn't have versioning, so if the
 	 * control is one word, assume version 0.
 	 */
-	if (cs_ctl->len == 4) {
-		compr_dbg(buf, "host_buf_ptr=%x\n", buf->host_buf_ptr);
-		return 0;
-	}
+	if (cs_ctl->len == 4)
+		goto done;
 
 	version = be32_to_cpu(coeff_v1.versions) & HOST_BUF_COEFF_COMPAT_VER_MASK;
 	version >>= HOST_BUF_COEFF_COMPAT_VER_SHIFT;
@@ -1483,7 +1488,8 @@ static int wm_adsp_buffer_parse_coeff(struct cs_dsp_coeff_ctl *cs_ctl)
 		adsp_err(dsp,
 			 "Host buffer coeff ver %u > supported version %u\n",
 			 version, HOST_BUF_COEFF_SUPPORTED_COMPAT_VER);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err;
 	}
 
 	cs_dsp_remove_padding((u32 *)&coeff_v1.name, ARRAY_SIZE(coeff_v1.name));
@@ -1491,10 +1497,18 @@ static int wm_adsp_buffer_parse_coeff(struct cs_dsp_coeff_ctl *cs_ctl)
 	buf->name = kasprintf(GFP_KERNEL, "%s-dsp-%s", dsp->part,
 			      (char *)&coeff_v1.name);
 
+done:
+	list_add_tail(&buf->list, &dsp->buffer_list);
+
 	compr_dbg(buf, "host_buf_ptr=%x coeff version %u\n",
 		  buf->host_buf_ptr, version);
 
 	return version;
+
+err:
+	kfree(buf);
+
+	return ret;
 }
 
 static int wm_adsp_buffer_init(struct wm_adsp *dsp)
@@ -1522,10 +1536,8 @@ static int wm_adsp_buffer_init(struct wm_adsp *dsp)
 	if (list_empty(&dsp->buffer_list)) {
 		/* Fall back to legacy support */
 		ret = wm_adsp_buffer_parse_legacy(dsp);
-		if (ret) {
-			adsp_err(dsp, "Failed to parse legacy: %d\n", ret);
-			goto error;
-		}
+		if (ret)
+			adsp_warn(dsp, "Failed to parse legacy: %d\n", ret);
 	}
 
 	return 0;