ASoC: wm_adsp: Switch to using wm_coeff_read_ctrl for compressed buffers

When parsing a compressed buffer from the firmware the driver currently
open codes reading the firmware coefficient containing the buffer
description. Improve this slightly by using the coefficient read
functions already provided by the wm_adsp driver. It is worth noting
this change requires the running variable to be set before
wm_adsp_buffer_init is called, however this is safe, since its all still
under the power lock and nothing in the compressed code gates itself on
running.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210913160057.103842-4-simont@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm_adsp.c

@@ -3277,14 +3277,14 @@ int wm_adsp_event(struct snd_soc_dapm_widget *w,
 				goto err;
 		}
 
+		dsp->running = true;
+
 		if (wm_adsp_fw[dsp->fw].num_caps != 0) {
 			ret = wm_adsp_buffer_init(dsp);
 			if (ret < 0)
 				goto err;
 		}
 
-		dsp->running = true;
-
 		mutex_unlock(&dsp->pwr_lock);
 		break;
 
@@ -3869,26 +3869,21 @@ static int wm_adsp_buffer_parse_coeff(struct wm_coeff_ctl *ctl)
 {
 	struct wm_adsp_host_buf_coeff_v1 coeff_v1;
 	struct wm_adsp_compr_buf *buf;
-	unsigned int reg, version;
-	__be32 bufp;
+	unsigned int version;
 	int ret, i;
 
-	ret = wm_coeff_base_reg(ctl, &reg);
-	if (ret)
-		return ret;
-
 	for (i = 0; i < 5; ++i) {
-		ret = regmap_raw_read(ctl->dsp->regmap, reg, &bufp, sizeof(bufp));
+		ret = wm_coeff_read_ctrl(ctl, &coeff_v1, sizeof(coeff_v1));
 		if (ret < 0)
 			return ret;
 
-		if (bufp)
+		if (coeff_v1.host_buf_ptr)
 			break;
 
 		usleep_range(1000, 2000);
 	}
 
-	if (!bufp) {
+	if (!coeff_v1.host_buf_ptr) {
 		adsp_err(ctl->dsp, "Failed to acquire host buffer\n");
 		return -EIO;
 	}
@@ -3898,7 +3893,7 @@ static int wm_adsp_buffer_parse_coeff(struct wm_coeff_ctl *ctl)
 		return -ENOMEM;
 
 	buf->host_buf_mem_type = ctl->alg_region.type;
-	buf->host_buf_ptr = be32_to_cpu(bufp);
+	buf->host_buf_ptr = be32_to_cpu(coeff_v1.host_buf_ptr);
 
 	ret = wm_adsp_buffer_populate(buf);
 	if (ret < 0)
@@ -3913,11 +3908,6 @@ static int wm_adsp_buffer_parse_coeff(struct wm_coeff_ctl *ctl)
 		return 0;
 	}
 
-	ret = regmap_raw_read(ctl->dsp->regmap, reg, &coeff_v1,
-			      sizeof(coeff_v1));
-	if (ret < 0)
-		return ret;
-
 	version = be32_to_cpu(coeff_v1.versions) & HOST_BUF_COEFF_COMPAT_VER_MASK;
 	version >>= HOST_BUF_COEFF_COMPAT_VER_SHIFT;