Re: [PATCH] ASoC: meson: axg-fifo: add NO_PERIOD_WAKEUP support

[Mark Brown]

On Wed, 7 Apr 2021 16:59:14 +0200, Jerome Brunet wrote:
> On the AXG family, the fifo irq is not necessary for the HW to operate.
> It is just used to notify that a period has elapsed. If userpace does not
> care for these wakeups (such as pipewire), we are just wasting CPU cycles.
> 
> Add support for NO_PERIOD_WAKEUP and disable irq when they are no needed.

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: meson: axg-fifo: add NO_PERIOD_WAKEUP support
  commit: 9be701ec3493d3348723a38f0c19702d710758ce

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

[PATCH] ASoC: meson: axg-fifo: add NO_PERIOD_WAKEUP support

[Jerome Brunet]

On the AXG family, the fifo irq is not necessary for the HW to operate.
It is just used to notify that a period has elapsed. If userpace does not
care for these wakeups (such as pipewire), we are just wasting CPU cycles.

Add support for NO_PERIOD_WAKEUP and disable irq when they are no needed.

Signed-off-by: Jerome Brunet 
---
 sound/soc/meson/axg-fifo.c | 11 ++-
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/sound/soc/meson/axg-fifo.c b/sound/soc/meson/axg-fifo.c
index b2e867113226..b9af2d513e09 100644
--- a/sound/soc/meson/axg-fifo.c
+++ b/sound/soc/meson/axg-fifo.c
@@ -27,8 +27,8 @@ static struct snd_pcm_hardware axg_fifo_hw = {
 SNDRV_PCM_INFO_MMAP |
 SNDRV_PCM_INFO_MMAP_VALID |
 SNDRV_PCM_INFO_BLOCK_TRANSFER |
-SNDRV_PCM_INFO_PAUSE),
-
+SNDRV_PCM_INFO_PAUSE |
+SNDRV_PCM_INFO_NO_PERIOD_WAKEUP),
.formats = AXG_FIFO_FORMATS,
.rate_min = 5512,
.rate_max = 192000,
@@ -113,7 +113,7 @@ int axg_fifo_pcm_hw_params(struct snd_soc_component 
*component,
 {
struct snd_pcm_runtime *runtime = ss->runtime;
struct axg_fifo *fifo = axg_fifo_data(ss);
-   unsigned int burst_num, period, threshold;
+   unsigned int burst_num, period, threshold, irq_en;
dma_addr_t end_ptr;
 
period = params_period_bytes(params);
@@ -142,10 +142,11 @@ int axg_fifo_pcm_hw_params(struct snd_soc_component 
*component,
regmap_field_write(fifo->field_threshold,
   threshold ? threshold - 1 : 0);
 
-   /* Enable block count irq */
+   /* Enable irq if necessary  */
+   irq_en = runtime->no_period_wakeup ? 0 : FIFO_INT_COUNT_REPEAT;
regmap_update_bits(fifo->map, FIFO_CTRL0,
   CTRL0_INT_EN(FIFO_INT_COUNT_REPEAT),
-  CTRL0_INT_EN(FIFO_INT_COUNT_REPEAT));
+  CTRL0_INT_EN(irq_en));
 
return 0;
 }
-- 
2.30.2