* [PATCH V2 0/2] recover the channel swap after xrun
@ 2019-07-03 6:42 shengjiu.wang
2019-07-03 6:42 ` [PATCH V2 1/2] ASoC: fsl_esai: Wrap some operations to be functions shengjiu.wang
2019-07-03 6:42 ` [PATCH V2 2/2] ASoC: fsl_esai: recover the channel swap after xrun shengjiu.wang
0 siblings, 2 replies; 6+ messages in thread
From: shengjiu.wang @ 2019-07-03 6:42 UTC (permalink / raw)
To: timur, nicoleotsuka, Xiubo.Lee, festevam, broonie, alsa-devel
Cc: linuxppc-dev, linux-kernel
From: Shengjiu Wang <shengjiu.wang@nxp.com>
recover the channel swap after xrun
Shengjiu Wang (2):
ASoC: fsl_esai: Wrap some operations to be functions
ASoC: fsl_esai: recover the channel swap after xrun
sound/soc/fsl/fsl_esai.c | 267 ++++++++++++++++++++++++++++-----------
1 file changed, 194 insertions(+), 73 deletions(-)
Changes in v2
- add one patch for wrap operations to functions.
- fix some coding style issue
--
2.21.0
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH V2 1/2] ASoC: fsl_esai: Wrap some operations to be functions
2019-07-03 6:42 [PATCH V2 0/2] recover the channel swap after xrun shengjiu.wang
@ 2019-07-03 6:42 ` shengjiu.wang
2019-07-03 9:10 ` Nicolin Chen
2019-07-03 6:42 ` [PATCH V2 2/2] ASoC: fsl_esai: recover the channel swap after xrun shengjiu.wang
1 sibling, 1 reply; 6+ messages in thread
From: shengjiu.wang @ 2019-07-03 6:42 UTC (permalink / raw)
To: timur, nicoleotsuka, Xiubo.Lee, festevam, broonie, alsa-devel
Cc: linuxppc-dev, linux-kernel
From: Shengjiu Wang <shengjiu.wang@nxp.com>
Extract the operation to be functions, to improve the
readability.
In this patch, fsl_esai_init, fsl_esai_register_restore,
fsl_esai_trigger_start and fsl_esai_trigger_stop are
extracted.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
sound/soc/fsl/fsl_esai.c | 191 ++++++++++++++++++++++++---------------
1 file changed, 118 insertions(+), 73 deletions(-)
diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index 10d2210c91ef..20039ae9893b 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -35,6 +35,7 @@
* @fifo_depth: depth of tx/rx FIFO
* @slot_width: width of each DAI slot
* @slots: number of slots
+ * @channels: channel num for tx or rx
* @hck_rate: clock rate of desired HCKx clock
* @sck_rate: clock rate of desired SCKx clock
* @hck_dir: the direction of HCKx pads
@@ -57,6 +58,7 @@ struct fsl_esai {
u32 slots;
u32 tx_mask;
u32 rx_mask;
+ u32 channels[2];
u32 hck_rate[2];
u32 sck_rate[2];
bool hck_dir[2];
@@ -543,64 +545,131 @@ static int fsl_esai_hw_params(struct snd_pcm_substream *substream,
return 0;
}
-static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
- struct snd_soc_dai *dai)
+static int fsl_esai_init(struct fsl_esai *esai_priv)
{
- struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
- bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
- u8 i, channels = substream->runtime->channels;
+ struct platform_device *pdev = esai_priv->pdev;
+ int ret;
+
+ /* Reset ESAI unit */
+ ret = regmap_update_bits(esai_priv->regmap, REG_ESAI_ECR,
+ ESAI_ECR_ESAIEN_MASK | ESAI_ECR_ERST_MASK,
+ ESAI_ECR_ESAIEN | ESAI_ECR_ERST);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * We need to enable ESAI so as to access some of its registers.
+ * Otherwise, we would fail to dump regmap from user space.
+ */
+ ret = regmap_update_bits(esai_priv->regmap, REG_ESAI_ECR,
+ ESAI_ECR_ESAIEN_MASK | ESAI_ECR_ERST_MASK,
+ ESAI_ECR_ESAIEN);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to enable ESAI: %d\n", ret);
+ return ret;
+ }
+
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_PRRC,
+ ESAI_PRRC_PDC_MASK, 0);
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_PCRC,
+ ESAI_PCRC_PC_MASK, 0);
+
+ return 0;
+}
+
+static int fsl_esai_register_restore(struct fsl_esai *esai_priv)
+{
+ int ret;
+ /* FIFO reset for safety */
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_TFCR,
+ ESAI_xFCR_xFR, ESAI_xFCR_xFR);
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_RFCR,
+ ESAI_xFCR_xFR, ESAI_xFCR_xFR);
+
+ regcache_mark_dirty(esai_priv->regmap);
+ ret = regcache_sync(esai_priv->regmap);
+ if (ret)
+ return ret;
+
+ /* FIFO reset done */
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_TFCR, ESAI_xFCR_xFR, 0);
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_RFCR, ESAI_xFCR_xFR, 0);
+
+ return 0;
+}
+
+static void fsl_esai_trigger_start(struct fsl_esai *esai_priv, bool tx)
+{
+ u8 i, channels = esai_priv->channels[tx];
u32 pins = DIV_ROUND_UP(channels, esai_priv->slots);
u32 mask;
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
+ ESAI_xFCR_xFEN_MASK, ESAI_xFCR_xFEN);
+
+ /* Write initial words reqiured by ESAI as normal procedure */
+ for (i = 0; tx && i < channels; i++)
+ regmap_write(esai_priv->regmap, REG_ESAI_ETDR, 0x0);
+
+ /*
+ * When set the TE/RE in the end of enablement flow, there
+ * will be channel swap issue for multi data line case.
+ * In order to workaround this issue, we switch the bit
+ * enablement sequence to below sequence
+ * 1) clear the xSMB & xSMA: which is done in probe and
+ * stop state.
+ * 2) set TE/RE
+ * 3) set xSMB
+ * 4) set xSMA: xSMA is the last one in this flow, which
+ * will trigger esai to start.
+ */
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
+ tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK,
+ tx ? ESAI_xCR_TE(pins) : ESAI_xCR_RE(pins));
+ mask = tx ? esai_priv->tx_mask : esai_priv->rx_mask;
+
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMB(tx),
+ ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(mask));
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMA(tx),
+ ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(mask));
+}
+
+static void fsl_esai_trigger_stop(struct fsl_esai *esai_priv, bool tx)
+{
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
+ tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, 0);
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMA(tx),
+ ESAI_xSMA_xS_MASK, 0);
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMB(tx),
+ ESAI_xSMB_xS_MASK, 0);
+
+ /* Disable and reset FIFO */
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
+ ESAI_xFCR_xFR | ESAI_xFCR_xFEN, ESAI_xFCR_xFR);
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
+ ESAI_xFCR_xFR, 0);
+}
+
+static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
+ bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+
+ esai_priv->channels[tx] = substream->runtime->channels;
+
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
- ESAI_xFCR_xFEN_MASK, ESAI_xFCR_xFEN);
-
- /* Write initial words reqiured by ESAI as normal procedure */
- for (i = 0; tx && i < channels; i++)
- regmap_write(esai_priv->regmap, REG_ESAI_ETDR, 0x0);
-
- /*
- * When set the TE/RE in the end of enablement flow, there
- * will be channel swap issue for multi data line case.
- * In order to workaround this issue, we switch the bit
- * enablement sequence to below sequence
- * 1) clear the xSMB & xSMA: which is done in probe and
- * stop state.
- * 2) set TE/RE
- * 3) set xSMB
- * 4) set xSMA: xSMA is the last one in this flow, which
- * will trigger esai to start.
- */
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
- tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK,
- tx ? ESAI_xCR_TE(pins) : ESAI_xCR_RE(pins));
- mask = tx ? esai_priv->tx_mask : esai_priv->rx_mask;
-
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMB(tx),
- ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(mask));
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMA(tx),
- ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(mask));
-
+ fsl_esai_trigger_start(esai_priv, tx);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
- tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, 0);
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMA(tx),
- ESAI_xSMA_xS_MASK, 0);
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMB(tx),
- ESAI_xSMB_xS_MASK, 0);
-
- /* Disable and reset FIFO */
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
- ESAI_xFCR_xFR | ESAI_xFCR_xFEN, ESAI_xFCR_xFR);
- regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
- ESAI_xFCR_xFR, 0);
+ fsl_esai_trigger_stop(esai_priv, tx);
break;
default:
return -EINVAL;
@@ -866,22 +935,9 @@ static int fsl_esai_probe(struct platform_device *pdev)
dev_set_drvdata(&pdev->dev, esai_priv);
- /* Reset ESAI unit */
- ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ERST);
- if (ret) {
- dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret);
+ ret = fsl_esai_init(esai_priv);
+ if (ret)
return ret;
- }
-
- /*
- * We need to enable ESAI so as to access some of its registers.
- * Otherwise, we would fail to dump regmap from user space.
- */
- ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ESAIEN);
- if (ret) {
- dev_err(&pdev->dev, "failed to enable ESAI: %d\n", ret);
- return ret;
- }
esai_priv->tx_mask = 0xFFFFFFFF;
esai_priv->rx_mask = 0xFFFFFFFF;
@@ -955,20 +1011,10 @@ static int fsl_esai_runtime_resume(struct device *dev)
regcache_cache_only(esai->regmap, false);
- /* FIFO reset for safety */
- regmap_update_bits(esai->regmap, REG_ESAI_TFCR,
- ESAI_xFCR_xFR, ESAI_xFCR_xFR);
- regmap_update_bits(esai->regmap, REG_ESAI_RFCR,
- ESAI_xFCR_xFR, ESAI_xFCR_xFR);
-
- ret = regcache_sync(esai->regmap);
+ ret = fsl_esai_register_restore(esai);
if (ret)
goto err_regcache_sync;
- /* FIFO reset done */
- regmap_update_bits(esai->regmap, REG_ESAI_TFCR, ESAI_xFCR_xFR, 0);
- regmap_update_bits(esai->regmap, REG_ESAI_RFCR, ESAI_xFCR_xFR, 0);
-
return 0;
err_regcache_sync:
@@ -991,7 +1037,6 @@ static int fsl_esai_runtime_suspend(struct device *dev)
struct fsl_esai *esai = dev_get_drvdata(dev);
regcache_cache_only(esai->regmap, true);
- regcache_mark_dirty(esai->regmap);
if (!IS_ERR(esai->fsysclk))
clk_disable_unprepare(esai->fsysclk);
--
2.21.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH V2 2/2] ASoC: fsl_esai: recover the channel swap after xrun
2019-07-03 6:42 [PATCH V2 0/2] recover the channel swap after xrun shengjiu.wang
2019-07-03 6:42 ` [PATCH V2 1/2] ASoC: fsl_esai: Wrap some operations to be functions shengjiu.wang
@ 2019-07-03 6:42 ` shengjiu.wang
2019-07-03 9:32 ` Nicolin Chen
2019-07-03 20:56 ` Cezary Rojewski
1 sibling, 2 replies; 6+ messages in thread
From: shengjiu.wang @ 2019-07-03 6:42 UTC (permalink / raw)
To: timur, nicoleotsuka, Xiubo.Lee, festevam, broonie, alsa-devel
Cc: linuxppc-dev, linux-kernel
From: Shengjiu Wang <shengjiu.wang@nxp.com>
There is chip errata ERR008000, the reference doc is
(https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf),
The issue is "While using ESAI transmit or receive and
an underrun/overrun happens, channel swap may occur.
The only recovery mechanism is to reset the ESAI."
This issue exist in imx3/imx5/imx6(partial) series.
In this commit add a tasklet to handle reset of ESAI
after xrun happens to recover the channel swap.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
sound/soc/fsl/fsl_esai.c | 76 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index 20039ae9893b..8c92e49ad6d8 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -32,6 +32,7 @@
* @extalclk: esai clock source to derive HCK, SCK and FS
* @fsysclk: system clock source to derive HCK, SCK and FS
* @spbaclk: SPBA clock (optional, depending on SoC design)
+ * @task: tasklet to handle the reset operation
* @fifo_depth: depth of tx/rx FIFO
* @slot_width: width of each DAI slot
* @slots: number of slots
@@ -42,6 +43,7 @@
* @sck_div: if using PSR/PM dividers for SCKx clock
* @slave_mode: if fully using DAI slave mode
* @synchronous: if using tx/rx synchronous mode
+ * @reset_at_xrun: flags for enable reset operaton
* @name: driver name
*/
struct fsl_esai {
@@ -53,6 +55,7 @@ struct fsl_esai {
struct clk *extalclk;
struct clk *fsysclk;
struct clk *spbaclk;
+ struct tasklet_struct task;
u32 fifo_depth;
u32 slot_width;
u32 slots;
@@ -65,6 +68,7 @@ struct fsl_esai {
bool sck_div[2];
bool slave_mode;
bool synchronous;
+ bool reset_at_xrun;
char name[32];
};
@@ -73,8 +77,16 @@ static irqreturn_t esai_isr(int irq, void *devid)
struct fsl_esai *esai_priv = (struct fsl_esai *)devid;
struct platform_device *pdev = esai_priv->pdev;
u32 esr;
+ u32 saisr;
regmap_read(esai_priv->regmap, REG_ESAI_ESR, &esr);
+ regmap_read(esai_priv->regmap, REG_ESAI_SAISR, &saisr);
+
+ if ((saisr & (ESAI_SAISR_TUE | ESAI_SAISR_ROE)) &&
+ esai_priv->reset_at_xrun) {
+ dev_dbg(&pdev->dev, "reset module for xrun\n");
+ tasklet_schedule(&esai_priv->task);
+ }
if (esr & ESAI_ESR_TINIT_MASK)
dev_dbg(&pdev->dev, "isr: Transmission Initialized\n");
@@ -634,10 +646,17 @@ static void fsl_esai_trigger_start(struct fsl_esai *esai_priv, bool tx)
ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(mask));
regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMA(tx),
ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(mask));
+
+ /* Enable Exception interrupt */
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
+ ESAI_xCR_xEIE_MASK, ESAI_xCR_xEIE);
}
static void fsl_esai_trigger_stop(struct fsl_esai *esai_priv, bool tx)
{
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
+ ESAI_xCR_xEIE_MASK, 0);
+
regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, 0);
regmap_update_bits(esai_priv->regmap, REG_ESAI_xSMA(tx),
@@ -652,6 +671,53 @@ static void fsl_esai_trigger_stop(struct fsl_esai *esai_priv, bool tx)
ESAI_xFCR_xFR, 0);
}
+static void fsl_esai_reset(unsigned long arg)
+{
+ struct fsl_esai *esai_priv = (struct fsl_esai *)arg;
+ u32 saisr, tfcr, rfcr;
+
+ /* save the registers */
+ regmap_read(esai_priv->regmap, REG_ESAI_TFCR, &tfcr);
+ regmap_read(esai_priv->regmap, REG_ESAI_RFCR, &rfcr);
+
+ /* stop the tx & rx */
+ fsl_esai_trigger_stop(esai_priv, 1);
+ fsl_esai_trigger_stop(esai_priv, 0);
+
+ /* reset the esai, and restore the registers */
+ fsl_esai_init(esai_priv);
+
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
+ ESAI_xCR_xPR_MASK,
+ ESAI_xCR_xPR);
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR,
+ ESAI_xCR_xPR_MASK,
+ ESAI_xCR_xPR);
+
+ /* restore registers by regcache_sync */
+ fsl_esai_register_restore(esai_priv);
+
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
+ ESAI_xCR_xPR_MASK, 0);
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR,
+ ESAI_xCR_xPR_MASK, 0);
+
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_PRRC,
+ ESAI_PRRC_PDC_MASK,
+ ESAI_PRRC_PDC(ESAI_GPIO));
+ regmap_update_bits(esai_priv->regmap, REG_ESAI_PCRC,
+ ESAI_PCRC_PC_MASK,
+ ESAI_PCRC_PC(ESAI_GPIO));
+
+ regmap_read(esai_priv->regmap, REG_ESAI_SAISR, &saisr);
+
+ /* restart tx / rx, if they already enabled */
+ if (tfcr & ESAI_xFCR_xFEN)
+ fsl_esai_trigger_start(esai_priv, 1);
+ if (rfcr & ESAI_xFCR_xFEN)
+ fsl_esai_trigger_start(esai_priv, 0);
+}
+
static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
@@ -856,6 +922,10 @@ static int fsl_esai_probe(struct platform_device *pdev)
esai_priv->pdev = pdev;
snprintf(esai_priv->name, sizeof(esai_priv->name), "%pOFn", np);
+ if (of_device_is_compatible(np, "fsl,vf610-esai") ||
+ of_device_is_compatible(np, "fsl,imx35-esai"))
+ esai_priv->reset_at_xrun = true;
+
/* Get the addresses and IRQ */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(&pdev->dev, res);
@@ -955,6 +1025,9 @@ static int fsl_esai_probe(struct platform_device *pdev)
return ret;
}
+ tasklet_init(&esai_priv->task, fsl_esai_reset,
+ (unsigned long)esai_priv);
+
pm_runtime_enable(&pdev->dev);
regcache_cache_only(esai_priv->regmap, true);
@@ -968,7 +1041,10 @@ static int fsl_esai_probe(struct platform_device *pdev)
static int fsl_esai_remove(struct platform_device *pdev)
{
+ struct fsl_esai *esai_priv = platform_get_drvdata(pdev);
+
pm_runtime_disable(&pdev->dev);
+ tasklet_kill(&esai_priv->task);
return 0;
}
--
2.21.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH V2 1/2] ASoC: fsl_esai: Wrap some operations to be functions
2019-07-03 6:42 ` [PATCH V2 1/2] ASoC: fsl_esai: Wrap some operations to be functions shengjiu.wang
@ 2019-07-03 9:10 ` Nicolin Chen
0 siblings, 0 replies; 6+ messages in thread
From: Nicolin Chen @ 2019-07-03 9:10 UTC (permalink / raw)
To: shengjiu.wang
Cc: timur, Xiubo.Lee, festevam, broonie, alsa-devel, linuxppc-dev,
linux-kernel
Looks good to me, yet two small comments inline.
Please add this to this patch in the next version:
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
On Wed, Jul 03, 2019 at 02:42:04PM +0800, shengjiu.wang@nxp.com wrote:
> +static int fsl_esai_register_restore(struct fsl_esai *esai_priv)
> +{
> + int ret;
> + /* FIFO reset for safety */
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_TFCR,
Checkpatch script would probably warn this. Usually we add a blank
line after variable declarations.
> @@ -866,22 +935,9 @@ static int fsl_esai_probe(struct platform_device *pdev)
>
> dev_set_drvdata(&pdev->dev, esai_priv);
>
> - /* Reset ESAI unit */
> - ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ERST);
> - if (ret) {
> - dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret);
> + ret = fsl_esai_init(esai_priv);
Could we rename this function to fsl_easi_hw_init() or something
clear like fsl_esai_register_init? fsl_easi_init() feels like a
driver init() function to me.
Thank you
Nicolin
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH V2 2/2] ASoC: fsl_esai: recover the channel swap after xrun
2019-07-03 6:42 ` [PATCH V2 2/2] ASoC: fsl_esai: recover the channel swap after xrun shengjiu.wang
@ 2019-07-03 9:32 ` Nicolin Chen
2019-07-03 20:56 ` Cezary Rojewski
1 sibling, 0 replies; 6+ messages in thread
From: Nicolin Chen @ 2019-07-03 9:32 UTC (permalink / raw)
To: shengjiu.wang
Cc: timur, Xiubo.Lee, festevam, broonie, alsa-devel, linuxppc-dev,
linux-kernel
On Wed, Jul 03, 2019 at 02:42:05PM +0800, shengjiu.wang@nxp.com wrote:
> From: Shengjiu Wang <shengjiu.wang@nxp.com>
>
> There is chip errata ERR008000, the reference doc is
> (https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf),
>
> The issue is "While using ESAI transmit or receive and
> an underrun/overrun happens, channel swap may occur.
> The only recovery mechanism is to reset the ESAI."
>
> This issue exist in imx3/imx5/imx6(partial) series.
>
> In this commit add a tasklet to handle reset of ESAI
> after xrun happens to recover the channel swap.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---
> sound/soc/fsl/fsl_esai.c | 76 ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 76 insertions(+)
>
> diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
> index 20039ae9893b..8c92e49ad6d8 100644
> --- a/sound/soc/fsl/fsl_esai.c
> +++ b/sound/soc/fsl/fsl_esai.c
> +static void fsl_esai_reset(unsigned long arg)
Similarly fsl_esai_hw_reset? This one isn't really that bad though,
yet it feels better to have function naming in a similar style.
> +{
> + struct fsl_esai *esai_priv = (struct fsl_esai *)arg;
> + u32 saisr, tfcr, rfcr;
> +
> + /* save the registers */
> + regmap_read(esai_priv->regmap, REG_ESAI_TFCR, &tfcr);
> + regmap_read(esai_priv->regmap, REG_ESAI_RFCR, &rfcr);
Instead of having this implicit comments, we could have:
+ bool tx = true, rx = false, enabled[2];
+
+ regmap_read(esai_priv->regmap, REG_ESAI_TFCR, &tfcr);
+ regmap_read(esai_priv->regmap, REG_ESAI_RFCR, &rfcr);
+ enabled[tx] = tfcr & ESAI_xFCR_xFEN;
+ enabled[rx] = rfcr & ESAI_xFCR_xFEN;
> +
> + /* stop the tx & rx */
> + fsl_esai_trigger_stop(esai_priv, 1);
> + fsl_esai_trigger_stop(esai_priv, 0);
And we could reuse the boolean 'tx' and 'rx' here.
> +
> + /* reset the esai, and restore the registers */
> + fsl_esai_init(esai_priv);
> +
[...]
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
> + ESAI_xCR_xPR_MASK,
> + ESAI_xCR_xPR);
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR,
> + ESAI_xCR_xPR_MASK,
> + ESAI_xCR_xPR);
Mask and value might fit into one line?
> +
> + /* restore registers by regcache_sync */
> + fsl_esai_register_restore(esai_priv);
> +
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
> + ESAI_xCR_xPR_MASK, 0);
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR,
> + ESAI_xCR_xPR_MASK, 0);
And just for curious, can (or shall) we stuff this personal reset
to the reset() function? I found this one is a part of the reset
routine being mentioned in the RM -- it was done after ESAI reset
is done via ECR register.
[...]
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_PRRC,
> + ESAI_PRRC_PDC_MASK,
> + ESAI_PRRC_PDC(ESAI_GPIO));
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_PCRC,
> + ESAI_PCRC_PC_MASK,
> + ESAI_PCRC_PC(ESAI_GPIO));
Mask and value might fit into one line?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH V2 2/2] ASoC: fsl_esai: recover the channel swap after xrun
2019-07-03 6:42 ` [PATCH V2 2/2] ASoC: fsl_esai: recover the channel swap after xrun shengjiu.wang
2019-07-03 9:32 ` Nicolin Chen
@ 2019-07-03 20:56 ` Cezary Rojewski
1 sibling, 0 replies; 6+ messages in thread
From: Cezary Rojewski @ 2019-07-03 20:56 UTC (permalink / raw)
To: shengjiu.wang
Cc: timur, nicoleotsuka, Xiubo.Lee, festevam, broonie, alsa-devel,
linuxppc-dev, linux-kernel
On 2019-07-03 08:42, shengjiu.wang@nxp.com wrote:
> +static void fsl_esai_reset(unsigned long arg)
> +{
> + struct fsl_esai *esai_priv = (struct fsl_esai *)arg;
> + u32 saisr, tfcr, rfcr;
> +
> + /* save the registers */
> + regmap_read(esai_priv->regmap, REG_ESAI_TFCR, &tfcr);
> + regmap_read(esai_priv->regmap, REG_ESAI_RFCR, &rfcr);
> +
> + /* stop the tx & rx */
> + fsl_esai_trigger_stop(esai_priv, 1);
> + fsl_esai_trigger_stop(esai_priv, 0);
> +
> + /* reset the esai, and restore the registers */
> + fsl_esai_init(esai_priv);
<comment below applies>
> +
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
> + ESAI_xCR_xPR_MASK,
> + ESAI_xCR_xPR);
> + regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR,
> + ESAI_xCR_xPR_MASK,
> + ESAI_xCR_xPR);
> +
> + /* restore registers by regcache_sync */
> + fsl_esai_register_restore(esai_priv);
> +
Both _init and _restore may fail given their declaration in 1/2 "ASoC:
fsl_esai: Wrap some operations to be functions" yet here you simply
ignore the return values.
If failure of said functions is permissive, it might be a good place for
a comment.
Czarek
^ permalink raw reply [flat|nested] 6+ messages in thread
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2019-07-03 6:42 [PATCH V2 0/2] recover the channel swap after xrun shengjiu.wang
2019-07-03 6:42 ` [PATCH V2 1/2] ASoC: fsl_esai: Wrap some operations to be functions shengjiu.wang
2019-07-03 9:10 ` Nicolin Chen
2019-07-03 6:42 ` [PATCH V2 2/2] ASoC: fsl_esai: recover the channel swap after xrun shengjiu.wang
2019-07-03 9:32 ` Nicolin Chen
2019-07-03 20:56 ` Cezary Rojewski
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