Re: [PATCH 1/2] ASoC: rockchip: i2s: separate capture and playback

Enric Balletbo Serra
2016-05-02T09:13:31Z

Hi John,

Thanks for answer.

2016-04-30 9:00 GMT+02:00 John Keeping <john@keeping.me.uk>:
> Hi Enric,
>
> On Fri, Apr 29, 2016 at 04:59:27PM +0200, Enric Balletbo Serra wrote:
>> 2015-12-09 11:32 GMT+01:00 John Keeping <john@metanate.com>:
>> > If we only clear the tx/rx state when both are disabled it is not
>> > possible to start/stop one multiple times while the other is running.
>> > Since the two are independently controlled, treat them as such and
>> > remove the false dependency between capture and playback.
>> >
>> > Signed-off-by: John Keeping <john@metanate.com>
>> > ---
>> > sound/soc/rockchip/rockchip_i2s.c | 72 +++++++++++++++++----------------------
>> > 1 file changed, 32 insertions(+), 40 deletions(-)
>> >
>> > diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
>> > index 83b1b9c..acc6225 100644
>> > --- a/sound/soc/rockchip/rockchip_i2s.c
>> > +++ b/sound/soc/rockchip/rockchip_i2s.c
>> > @@ -82,8 +82,8 @@ static void rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
>> > I2S_DMACR_TDE_ENABLE, I2S_DMACR_TDE_ENABLE);
>> >
>> > regmap_update_bits(i2s->regmap, I2S_XFER,
>> > - I2S_XFER_TXS_START | I2S_XFER_RXS_START,
>> > - I2S_XFER_TXS_START | I2S_XFER_RXS_START);
>> > + I2S_XFER_TXS_START,
>> > + I2S_XFER_TXS_START);
>> >
>> > i2s->tx_start = true;
>> > } else {
>> > @@ -92,27 +92,23 @@ static void rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
>> > regmap_update_bits(i2s->regmap, I2S_DMACR,
>> > I2S_DMACR_TDE_ENABLE, I2S_DMACR_TDE_DISABLE);
>> >
>> > - if (!i2s->rx_start) {
>> > - regmap_update_bits(i2s->regmap, I2S_XFER,
>> > - I2S_XFER_TXS_START |
>> > - I2S_XFER_RXS_START,
>> > - I2S_XFER_TXS_STOP |
>> > - I2S_XFER_RXS_STOP);
>> > + regmap_update_bits(i2s->regmap, I2S_XFER,
>> > + I2S_XFER_TXS_START,
>> > + I2S_XFER_TXS_STOP);
>> >
>> > - regmap_update_bits(i2s->regmap, I2S_CLR,
>> > - I2S_CLR_TXC | I2S_CLR_RXC,
>> > - I2S_CLR_TXC | I2S_CLR_RXC);
>> > + regmap_update_bits(i2s->regmap, I2S_CLR,
>> > + I2S_CLR_TXC,
>> > + I2S_CLR_TXC);
>> >
>> > - regmap_read(i2s->regmap, I2S_CLR, &val);
>> > + regmap_read(i2s->regmap, I2S_CLR, &val);
>> >
>> > - /* Should wait for clear operation to finish */
>> > - while (val) {
>> > - regmap_read(i2s->regmap, I2S_CLR, &val);
>> > - retry--;
>> > - if (!retry) {
>> > - dev_warn(i2s->dev, "fail to clear\n");
>> > - break;
>> > - }
>> > + /* Should wait for clear operation to finish */
>> > + while (val & I2S_CLR_TXC) {
>> > + regmap_read(i2s->regmap, I2S_CLR, &val);
>> > + retry--;
>> > + if (!retry) {
>> > + dev_warn(i2s->dev, "fail to clear\n");
>> > + break;
>> > }
>> > }
>> > }
>> > @@ -128,8 +124,8 @@ static void rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
>> > I2S_DMACR_RDE_ENABLE, I2S_DMACR_RDE_ENABLE);
>> >
>> > regmap_update_bits(i2s->regmap, I2S_XFER,
>> > - I2S_XFER_TXS_START | I2S_XFER_RXS_START,
>> > - I2S_XFER_TXS_START | I2S_XFER_RXS_START);
>> > + I2S_XFER_RXS_START,
>> > + I2S_XFER_RXS_START);
>> >
>> > i2s->rx_start = true;
>> > } else {
>> > @@ -138,27 +134,23 @@ static void rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
>> > regmap_update_bits(i2s->regmap, I2S_DMACR,
>> > I2S_DMACR_RDE_ENABLE, I2S_DMACR_RDE_DISABLE);
>> >
>> > - if (!i2s->tx_start) {
>> > - regmap_update_bits(i2s->regmap, I2S_XFER,
>> > - I2S_XFER_TXS_START |
>> > - I2S_XFER_RXS_START,
>> > - I2S_XFER_TXS_STOP |
>> > - I2S_XFER_RXS_STOP);
>> > + regmap_update_bits(i2s->regmap, I2S_XFER,
>> > + I2S_XFER_RXS_START,
>> > + I2S_XFER_RXS_STOP);
>> >
>> > - regmap_update_bits(i2s->regmap, I2S_CLR,
>> > - I2S_CLR_TXC | I2S_CLR_RXC,
>> > - I2S_CLR_TXC | I2S_CLR_RXC);
>> > + regmap_update_bits(i2s->regmap, I2S_CLR,
>> > + I2S_CLR_RXC,
>> > + I2S_CLR_RXC);
>> >
>> > - regmap_read(i2s->regmap, I2S_CLR, &val);
>> > + regmap_read(i2s->regmap, I2S_CLR, &val);
>> >
>> > - /* Should wait for clear operation to finish */
>> > - while (val) {
>> > - regmap_read(i2s->regmap, I2S_CLR, &val);
>> > - retry--;
>> > - if (!retry) {
>> > - dev_warn(i2s->dev, "fail to clear\n");
>> > - break;
>> > - }
>> > + /* Should wait for clear operation to finish */
>> > + while (val & I2S_CLR_RXC) {
>> > + regmap_read(i2s->regmap, I2S_CLR, &val);
>> > + retry--;
>> > + if (!retry) {
>> > + dev_warn(i2s->dev, "fail to clear\n");
>> > + break;
>> > }
>> > }
>> > }
>> > --
>> > 2.6.3.462.gbe2c914
>>
>> Using my Veyron Jerry Chromebook wiht latest kernel I found that the
>> speakers doesn't work. Bisect points to this patch as the offending
>> commit. However your changes looks reasonable the fact is that
>> reverting the patch makes the audio work again on my device. I need to
>> dig a bit more into the issue, but meanwhile, any idea on what is
>> happening ? Can I ask which device did you test?
>
> I tested this on a Radxa Rock2 square. This change fixed an issue I
> found when running separate processes for playback and recording (I was
> testing with arecord and speaker-test IIRC) but I don't think that
> should be relevant. I just read through the patch again and I can't see
> anything obviously wrong so I'm afraid I don't have any idea what's
> causing the problem you're seeing.
>

By chance, do you have a git repo containing the changes required to
test the sound on Radxa Rock2? Guess this is not in mainline.

Thanks,
Enric

>
> John