Re: [PATCH v2 2/4] ALSA: hda: Rework snd_hdac_stream_reset() to use macros

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On 18/08/2022 15:15, Amadeusz Sławiński wrote:
We can use existing macros to poll and update register values instead of
open coding the functionality.

Reviewed-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
---
  sound/hda/hdac_stream.c | 26 ++++++--------------------
  1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index f3582012d22f..bdf6d4db6769 100644
--- a/sound/hda/hdac_stream.c
+++ b/sound/hda/hdac_stream.c
@@ -165,7 +165,6 @@ EXPORT_SYMBOL_GPL(snd_hdac_stop_streams_and_chip);
  void snd_hdac_stream_reset(struct hdac_stream *azx_dev)
  {
  	unsigned char val;
-	int timeout;
  	int dma_run_state;
snd_hdac_stream_clear(azx_dev);
@@ -173,30 +172,17 @@ void snd_hdac_stream_reset(struct hdac_stream *azx_dev)
  	dma_run_state = snd_hdac_stream_readb(azx_dev, SD_CTL) & SD_CTL_DMA_START;
snd_hdac_stream_updateb(azx_dev, SD_CTL, 0, SD_CTL_STREAM_RESET);
-	udelay(3);
-	timeout = 300;
-	do {
-		val = snd_hdac_stream_readb(azx_dev, SD_CTL) &
-			SD_CTL_STREAM_RESET;
-		if (val)
-			break;
-	} while (--timeout);
+
+	/* wait for hardware to report that the stream entered reset */
+	snd_hdac_stream_readb_poll(azx_dev, SD_CTL, val, (val & SD_CTL_STREAM_RESET), 3, 300);
if (azx_dev->bus->dma_stop_delay && dma_run_state)
  		udelay(azx_dev->bus->dma_stop_delay);
- val &= ~SD_CTL_STREAM_RESET;
-	snd_hdac_stream_writeb(azx_dev, SD_CTL, val);
-	udelay(3);
+	snd_hdac_stream_updateb(azx_dev, SD_CTL, SD_CTL_STREAM_RESET, 0);
- timeout = 300;
-	/* waiting for hardware to report that the stream is out of reset */
-	do {
-		val = snd_hdac_stream_readb(azx_dev, SD_CTL) &
-			SD_CTL_STREAM_RESET;
-		if (!val)
-			break;
-	} while (--timeout);
+	/* wait for hardware to report that the stream is out of reset */
+	snd_hdac_stream_readb_poll(azx_dev, SD_CTL, val, !(val & SD_CTL_STREAM_RESET), 3, 300);
/* reset first position - may not be synced with hw at this time */
  	if (azx_dev->posbuf)


HDA playback is failing on -next for various Tegra boards. Bisect is point to this commit and reverting it fixes the problem. I was a bit puzzled why this change is causing a problem, but looking closer there is a difference between the previous code that was calling snd_hdac_stream_readb() and the new code that is calling snd_hdac_stream_readb_poll(). The function snd_hdac_stream_readb() calls snd_hdac_aligned_mmio() is see if the device has an aligned MMIO which Tegra does and then would call snd_hdac_aligned_read(). However, now the code always call readb() and this is breaking Tegra.

So it is either necessary to update snd_hdac_stream_readb_poll() to handle this or revert this change.

Cheers
Jon

--
nvpublic



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