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From:   Ivan Orlov <ivan.orlov0322@gmail.com>
To:     perex@perex.cz, tiwai@suse.com
Cc:     Ivan Orlov <ivan.orlov0322@gmail.com>, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/2] ALSA: pcmtest: Move buffer iterator initialization to prepare callback
Date:   Fri,  4 Aug 2023 15:07:39 +0400
Message-Id: <20230804110740.9867-1-ivan.orlov0322@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Trigger callback is not the best place for buffer iterator
initialization, so move it out to the prepare callback, where it
have to be.

Minor enhancement: remove blank line.

Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
---
V1 -> V2:
- Split changes in the patch into two different patches

 sound/drivers/pcmtest.c | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/sound/drivers/pcmtest.c b/sound/drivers/pcmtest.c
index 08e14b5eb772..dc7c9c758537 100644
--- a/sound/drivers/pcmtest.c
+++ b/sound/drivers/pcmtest.c
@@ -92,7 +92,6 @@ MODULE_PARM_DESC(inject_trigger_err, "Inject EINVAL error in the 'trigger' callb
 module_param(inject_open_err, bool, 0600);
 MODULE_PARM_DESC(inject_open_err, "Inject EBUSY error in the 'open' callback");
 
-
 struct pcmtst {
 	struct snd_pcm *pcm;
 	struct snd_card *card;
@@ -405,25 +404,9 @@ static int snd_pcmtst_pcm_close(struct snd_pcm_substream *substream)
 
 static int snd_pcmtst_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
-	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct pcmtst_buf_iter *v_iter = runtime->private_data;
-
 	if (inject_trigger_err)
 		return -EINVAL;
 
-	v_iter->sample_bytes = runtime->sample_bits / 8;
-	v_iter->period_bytes = frames_to_bytes(runtime, runtime->period_size);
-	if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED ||
-	    runtime->access == SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED) {
-		v_iter->chan_block = runtime->dma_bytes / runtime->channels;
-		v_iter->interleaved = false;
-	} else {
-		v_iter->interleaved = true;
-	}
-	// We want to record RATE * ch_cnt samples per sec, it is rate * sample_bytes * ch_cnt bytes
-	v_iter->s_rw_ch = runtime->rate / TIMER_PER_SEC;
-	v_iter->b_rw = v_iter->s_rw_ch * v_iter->sample_bytes * runtime->channels;
-
 	return 0;
 }
 
@@ -454,8 +437,24 @@ static void pcmtst_pdev_release(struct device *dev)
 
 static int snd_pcmtst_pcm_prepare(struct snd_pcm_substream *substream)
 {
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct pcmtst_buf_iter *v_iter = runtime->private_data;
+
 	if (inject_prepare_err)
 		return -EINVAL;
+
+	v_iter->sample_bytes = samples_to_bytes(runtime, 1);
+	v_iter->period_bytes = snd_pcm_lib_period_bytes(substream);
+	v_iter->interleaved = true;
+	if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED ||
+	    runtime->access == SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED) {
+		v_iter->chan_block = snd_pcm_lib_buffer_bytes(substream) / runtime->channels;
+		v_iter->interleaved = false;
+	}
+	// We want to record RATE * ch_cnt samples per sec, it is rate * sample_bytes * ch_cnt bytes
+	v_iter->s_rw_ch = runtime->rate / TIMER_PER_SEC;
+	v_iter->b_rw = v_iter->s_rw_ch * v_iter->sample_bytes * runtime->channels;
+
 	return 0;
 }
 
-- 
2.34.1