Hi Harsha,
this looks mostly good to me, only have a couple of nit-picks below.
Thanks!
kabylake_ssp_fixup function uses snd_soc_dpcm to identify the codecs DAIs.
The hw parameters are changed based on the codec DAI,
the stream is intended for. The earlier approach to get
snd_soc_dpcm was using container_of() macro on snd_pcm_hw_params.
The structures have been modified over time and snd_soc_dpcm does
not have snd_pcm_hw_params as a reference but as a copy.
This causes the current driver to crash when used.
This patch changes the way snd_soc_dpcm is extracted.
The snd_soc_pcm_runtime holds 2 dpcm
instances (one for playback and one for capture).
The 2 codecs on this SSP are dmic and speakers.
One is for capture and one is for playback respectively.
Based on the direction of the stream,
the snd_soc_dpcm is extracted from the snd_soc_pcm_runtime structure.
Tested for all use cases of the driver.
Maybe reformat a bit and add newlines, this is difficult to read.
Signed-off-by: Harsha Priya <harshapriya.n@xxxxxxxxx>
Signed-off-by: Vamshi Krishna Gopal <vamshi.krishna.gopal@xxxxxxxxx>
Tested-by: Lukasz Majczak <lma@xxxxxxxxxxxx>
diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
index 584e4f9cedc2..9f4b949cc39c 100644
--- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
@@ -379,22 +379,42 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
struct snd_interval *chan = hw_param_interval(params,
SNDRV_PCM_HW_PARAM_CHANNELS);
struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
- struct snd_soc_dpcm *dpcm = container_of(
- params, struct snd_soc_dpcm, hw_params);
- struct snd_soc_dai_link *fe_dai_link = dpcm->fe->dai_link;
- struct snd_soc_dai_link *be_dai_link = dpcm->be->dai_link;
+ struct snd_soc_dpcm *dpcm, *rtd_dpcm = NULL;
The idea of initializing was also to test before dereferencing this
pointer. Without the test, this is somewhat useless, tools may still
complain about dereferencing a NULL pointer?
+
+ /*
+ * The following loop will be called only for playback stream
+ * In this platform, there is only one playback device on every SSP
+ */
+ for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_PLAYBACK, dpcm) {
+ rtd_dpcm = dpcm;
+ break;
+ }
+
+ /*
+ * This following loop will be called only for capture stream
+ * In this platform, there is only one capture device on every SSP
+ */
+ for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_CAPTURE, dpcm) {
+ rtd_dpcm = dpcm;
+ break;
+ }
add if (!rtd_dpcm) return -EINVAL here?
+ /*
+ * The above 2 loops are mutually exclusive based on the strem direction,
typo: stream
+ * thus rtd_dpcm variable will never be overwritten
+ */
