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

John Keeping
2016-05-03T10:32:06Z

Hi Enric,

On Tue, 3 May 2016 12:21:25 +0200, Enric Balletbo Serra wrote:
> 2016-05-03 11:43 GMT+02:00 John Keeping <john@metanate.com>:
> > On Tue, 3 May 2016 11:16:58 +0200, Enric Balletbo Serra wrote:
> >> 2016-05-03 6:12 GMT+02:00 sugar <sugar.zhang@rock-chips.com>:
> >> > On 4/30/2016 15:00, John Keeping Wrote:
> >> >> 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.
> >> >>
> >> > Do you have test playback/capture at the same time? I think you may
> >> > reproduce this issue if you do as follows:
> >> >
> >> > step 1: tinyplay test.wav -D 0 -d 0 -p 1024 -n 4 &
> >> > step 2: tinycap r.wav -D 0 -d 0 -p 1024 -n 4 &
> >> >
> >> > you will find that there is no music now.
> >> >
> >> > because of this problem, we enable tx/rx at the same time to WA this issue.
> >> >
> >>
> >> I can confirm that reverting John's patch audio playback/capture at
> >> the same time works on my Veyron Jerry Chromebook.
> >
> > Have you tried stopping one of the processes and then starting it again
> > (without touching the other process)? That's the case that was broken
> > for me without this patch.
> >
>
> I just tried that and it works on my platform. Meanwhile I reproduced
> a song I recorded two wavs.
>
> > I have had a quick look through the code I'm using and I noticed that I
> > have another change that hasn't been sent upstream, which marks the
> > I2S_FIFOLR register as volatile in rockchip_i2s_volatile_reg():
> >
>
> Unfortunately that didn't help, I hear nothing from the speakers :(

Yeah, I looked a bit more after sending the previous mail and that
register is never referenced by the driver!

> I have a Radxa Rock2 Square board, by chance, do you have a git tree
> containing the patches to enable the i2s sound for radxa so I can
> reproduce both here? At least the codec is not upstreamed, I guess.

I've just pushed a branch to Github:

https://github.com/johnkeeping/linux/tree/topic/audio

Regards,
John