[SRU][Focal][PATCH 1/1] UBUNTU: SAUCE: ASoC: amd: renoir: restore two more registers during resume

[Hui Wang]

BugLink: https://bugs.launchpad.net/bugs/1890220

Recently we found an issue about the suspend and resume. If dmic is
recording the sound, and we run suspend and resume, after the resume,
the dmic can't work well anymore. we need to close the app and reopen
the app, then the dmic could record the sound again.

For example, we run "arecord -D hw:CARD=acp,DEV=0 -f S32_LE -c 2
-r 48000 test.wav", then suspend and resume, after the system resume
back, we speak to the dmic. then stop the arecord, use aplay to play
the test.wav, we could hear the sound recorded after resume is weird,
it is not what we speak to the dmic.

I found two registers are set in the dai_hw_params(), if the two
registers are set during the resume, this issue could be fixed.
Move the code of the dai_hw_params() into the pdm_dai_trigger(), then
these two registers will be set during resume since pdm_dai_trigger()
will be called during resume. And delete the empty function
dai_hw_params().

Signed-off-by: Hui Wang <hui.wang at canonical.com>
Reviewed-by: Vijendar Mukunda <Vijendar.Mukunda at amd.com>
Cc: stable at vger.kernel.org
Link: https://lore.kernel.org/r/20200730123138.5659-1-hui.wang@canonical.com
Signed-off-by: Mark Brown <broonie at kernel.org>
(backported from commit ccff7bd468d5e0595176656a051ef67c01f01968
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git)
Signed-off-by: Hui Wang <hui.wang at canonical.com>
---
 sound/soc/amd/renoir/acp3x-pdm-dma.c | 29 +++++++++-------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/sound/soc/amd/renoir/acp3x-pdm-dma.c b/sound/soc/amd/renoir/acp3x-pdm-dma.c
index cacc0fdb1742..c3e59540522b 100644
--- a/sound/soc/amd/renoir/acp3x-pdm-dma.c
+++ b/sound/soc/amd/renoir/acp3x-pdm-dma.c
@@ -333,40 +333,30 @@ static int acp_pdm_dma_hw_free(struct snd_pcm_substream *substream)
 	return snd_pcm_lib_free_pages(substream);
 }
 
-static int acp_pdm_dai_hw_params(struct snd_pcm_substream *substream,
-				 struct snd_pcm_hw_params *params,
-				 struct snd_soc_dai *dai)
+static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,
+			       int cmd, struct snd_soc_dai *dai)
 {
 	struct pdm_stream_instance *rtd;
+	int ret;
+	bool pdm_status;
 	unsigned int ch_mask;
 
 	rtd = substream->runtime->private_data;
-	switch (params_channels(params)) {
+	ret = 0;
+	switch (substream->runtime->channels) {
 	case TWO_CH:
 		ch_mask = 0x00;
 		break;
 	default:
 		return -EINVAL;
 	}
-	rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS);
-	rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base +
-		  ACP_WOV_PDM_DECIMATION_FACTOR);
-	return 0;
-}
-
-static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,
-			       int cmd, struct snd_soc_dai *dai)
-{
-	struct pdm_stream_instance *rtd;
-	int ret;
-	bool pdm_status;
-
-	rtd = substream->runtime->private_data;
-	ret = 0;
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS);
+		rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base +
+			  ACP_WOV_PDM_DECIMATION_FACTOR);
 		rtd->bytescount = acp_pdm_get_byte_count(rtd,
 							 substream->stream);
 		pdm_status = check_pdm_dma_status(rtd->acp_base);
@@ -388,7 +378,6 @@ static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,
 }
 
 static struct snd_soc_dai_ops acp_pdm_dai_ops = {
-	.hw_params = acp_pdm_dai_hw_params,
 	.trigger   = acp_pdm_dai_trigger,
 };
 
-- 
2.17.1