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Message-ID: <20130725093855.GB24642@n2100.arm.linux.org.uk>
Date: Thu, 25 Jul 2013 10:38:55 +0100
From: Russell King - ARM Linux <linux@....linux.org.uk>
To: Jean-Francois Moine <moinejf@...e.fr>
Cc: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
Rob Herring <rob.herring@...xeda.com>,
alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH 1/4] ASoc: kirkwood: change the pcm/dma stream data
pointer
On Thu, Jul 25, 2013 at 11:13:14AM +0200, Jean-Francois Moine wrote:
> In the kirkwood pcm/dma driver, the private stream related data pointer
> was hold in the platform drvdata.
> As this pointer may be used by other parts of the audio subsystem,
> this patch uses the substream runtime private data pointer instead.
There's a much better solution to this, which is to get rid of
kirkwood_dma_priv entirely:
diff --git a/sound/soc/kirkwood/kirkwood-dma.c b/sound/soc/kirkwood/kirkwood-dma.c
index d3d4bdc..112c262 100644
--- a/sound/soc/kirkwood/kirkwood-dma.c
+++ b/sound/soc/kirkwood/kirkwood-dma.c
@@ -33,11 +33,11 @@
SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | \
SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE)
-struct kirkwood_dma_priv {
- struct snd_pcm_substream *play_stream;
- struct snd_pcm_substream *rec_stream;
- struct kirkwood_dma_data *data;
-};
+static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
+ return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
+}
static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
.info = (SNDRV_PCM_INFO_INTERLEAVED |
@@ -63,8 +63,7 @@ static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
{
- struct kirkwood_dma_priv *prdata = dev_id;
- struct kirkwood_dma_data *priv = prdata->data;
+ struct kirkwood_dma_data *priv = dev_id;
unsigned long mask, status, cause;
mask = readl(priv->io + KIRKWOOD_INT_MASK);
@@ -89,10 +88,10 @@ static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
writel(status, priv->io + KIRKWOOD_INT_CAUSE);
if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
- snd_pcm_period_elapsed(prdata->play_stream);
+ snd_pcm_period_elapsed(priv->substream_play);
if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
- snd_pcm_period_elapsed(prdata->rec_stream);
+ snd_pcm_period_elapsed(priv->substream_rec);
return IRQ_HANDLED;
}
@@ -126,15 +125,10 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream)
{
int err;
struct snd_pcm_runtime *runtime = substream->runtime;
- struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
- struct snd_soc_platform *platform = soc_runtime->platform;
- struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
- struct kirkwood_dma_data *priv;
- struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
+ struct kirkwood_dma_data *priv = kirkwood_priv(substream);
const struct mbus_dram_target_info *dram;
unsigned long addr;
- priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
/* Ensure that all constraints linked to dma burst are fulfilled */
@@ -157,21 +151,11 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream)
if (err < 0)
return err;
- if (prdata == NULL) {
- prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
- if (prdata == NULL)
- return -ENOMEM;
-
- prdata->data = priv;
-
+ if (!priv->substream_play && !priv->substream_rec) {
err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
- "kirkwood-i2s", prdata);
- if (err) {
- kfree(prdata);
+ "kirkwood-i2s", priv);
+ if (err)
return -EBUSY;
- }
-
- snd_soc_platform_set_drvdata(platform, prdata);
/*
* Enable Error interrupts. We're only ack'ing them but
@@ -183,11 +167,11 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream)
dram = mv_mbus_dram_info();
addr = substream->dma_buffer.addr;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- prdata->play_stream = substream;
+ priv->substream_play = substream;
kirkwood_dma_conf_mbus_windows(priv->io,
KIRKWOOD_PLAYBACK_WIN, addr, dram);
} else {
- prdata->rec_stream = substream;
+ priv->substream_rec = substream;
kirkwood_dma_conf_mbus_windows(priv->io,
KIRKWOOD_RECORD_WIN, addr, dram);
}
@@ -197,27 +181,19 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream)
static int kirkwood_dma_close(struct snd_pcm_substream *substream)
{
- struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
- struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
- struct snd_soc_platform *platform = soc_runtime->platform;
- struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
- struct kirkwood_dma_data *priv;
-
- priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
+ struct kirkwood_dma_data *priv = kirkwood_priv(substream);
- if (!prdata || !priv)
+ if (!priv)
return 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- prdata->play_stream = NULL;
+ priv->substream_play = NULL;
else
- prdata->rec_stream = NULL;
+ priv->substream_rec = NULL;
- if (!prdata->play_stream && !prdata->rec_stream) {
+ if (!priv->substream_play && !priv->substream_rec) {
writel(0, priv->io + KIRKWOOD_ERR_MASK);
- free_irq(priv->irq, prdata);
- kfree(prdata);
- snd_soc_platform_set_drvdata(platform, NULL);
+ free_irq(priv->irq, priv);
}
return 0;
@@ -243,13 +219,9 @@ static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
- struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
- struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
- struct kirkwood_dma_data *priv;
+ struct kirkwood_dma_data *priv = kirkwood_priv(substream);
unsigned long size, count;
- priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
-
/* compute buffer size in term of "words" as requested in specs */
size = frames_to_bytes(runtime, runtime->buffer_size);
size = (size>>2)-1;
@@ -272,13 +244,9 @@ static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
*substream)
{
- struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
- struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
- struct kirkwood_dma_data *priv;
+ struct kirkwood_dma_data *priv = kirkwood_priv(substream);
snd_pcm_uframes_t count;
- priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
-
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
count = bytes_to_frames(substream->runtime,
readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
diff --git a/sound/soc/kirkwood/kirkwood.h b/sound/soc/kirkwood/kirkwood.h
index 4d92637..10a3aaa 100644
--- a/sound/soc/kirkwood/kirkwood.h
+++ b/sound/soc/kirkwood/kirkwood.h
@@ -129,6 +129,8 @@ struct kirkwood_dma_data {
struct clk *extclk;
uint32_t ctl_play;
uint32_t ctl_rec;
+ struct snd_pcm_substream *substream_play;
+ struct snd_pcm_substream *substream_rec;
int irq;
int burst;
};
--
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