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ASoC: SOF: Intel: hda-pcm: Limit the maximum number of periods by MAX_BDL_ENTRIES

Message ID 20240704090106.371497-1-pierre-louis.bossart@linux.intel.com
State New
Headers show
Series ASoC: SOF: Intel: hda-pcm: Limit the maximum number of periods by MAX_BDL_ENTRIES | expand

Commit Message

Pierre-Louis Bossart July 4, 2024, 9:01 a.m. UTC 
From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

The HDaudio specification Section 3.6.2 limits the number of BDL entries to 256.

Make sure we don't allow more periods than this normative value.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/intel/hda-pcm.c | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Mark Brown July 4, 2024, 5:19 p.m. UTC | #1 
On Thu, 04 Jul 2024 11:01:06 +0200, Pierre-Louis Bossart wrote:
> The HDaudio specification Section 3.6.2 limits the number of BDL entries to 256.
> 
> Make sure we don't allow more periods than this normative value.
> 
> 

Applied to

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

Thanks!

[1/1] ASoC: SOF: Intel: hda-pcm: Limit the maximum number of periods by MAX_BDL_ENTRIES
      commit: 82bb8db96610b558920b8c57cd250ec90567d79b

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
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Patch

diff --git a/sound/soc/sof/intel/hda-pcm.c b/sound/soc/sof/intel/hda-pcm.c
index 9fb8521b896b..f6e24edd7adb 100644
--- a/sound/soc/sof/intel/hda-pcm.c
+++ b/sound/soc/sof/intel/hda-pcm.c
@@ -258,6 +258,12 @@  int hda_dsp_pcm_open(struct snd_sof_dev *sdev,
 	snd_pcm_hw_constraint_integer(substream->runtime,
 				      SNDRV_PCM_HW_PARAM_PERIODS);
 
+	/* Limit the maximum number of periods to not exceed the BDL entries count */
+	if (runtime->hw.periods_max > HDA_DSP_MAX_BDL_ENTRIES)
+		snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
+					     runtime->hw.periods_min,
+					     HDA_DSP_MAX_BDL_ENTRIES);
+
 	/* Only S16 and S32 supported by HDA hardware when used without DSP */
 	if (sdev->dspless_mode_selected)
 		snd_pcm_hw_constraint_mask64(substream->runtime, SNDRV_PCM_HW_PARAM_FORMAT,