Re: [PATCH] drm/vc4: hdmi: Avoid sleeping in atomic context

On Tue, 27 Oct 2020 11:15:58 +0100, Maxime Ripard wrote:

When running the trigger hook, ALSA by default will take a spinlock, and thus will run the trigger hook in atomic context.

However, our HDMI driver will send the infoframes as part of the trigger hook, and part of that process is to wait for a bit to be cleared for up to 100ms. To be nicer to the system, that wait has some usleep_range that interact poorly with the atomic context.

There's several ways we can fix this, but the more obvious one is to make ALSA take a mutex instead by setting the nonatomic flag on the DAI link. That doesn't work though, since now the cyclic callback installed by the dmaengine helpers in ALSA will take a mutex, while that callback is run by dmaengine's virt-chan code in a tasklet where sleeping is not allowed either.

Given the delay we need to poll the bit for, changing the usleep_range for a udelay and keep running it from a context where interrupts are disabled is not really a good option either.

However, we can move the infoframe setup code in the hw_params hook, like is usually done in other HDMI controllers, that isn't protected by a spinlock and thus where we can sleep. Infoframes will be sent on a regular basis anyway, and since hw_params is where the audio parameters that end up in the infoframes are setup, this also makes a bit more sense.

Fixes: bb7d78568814 ("drm/vc4: Add HDMI audio support") Suggested-by: Mark Brown broonie@kernel.org Signed-off-by: Maxime Ripard maxime@cerno.tech

Reviewed-by: Takashi Iwai tiwai@suse.de

thanks,

Takashi

---

drivers/gpu/drm/vc4/vc4_hdmi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 74da7c00ecd0..ec3ba3ecd32a 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -1077,6 +1077,7 @@ static int vc4_hdmi_audio_hw_params(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct vc4_hdmi *vc4_hdmi = dai_to_hdmi(dai);

• struct drm_encoder *encoder = &vc4_hdmi->encoder.base.base; struct device *dev = &vc4_hdmi->pdev->dev; u32 audio_packet_config, channel_mask; u32 channel_map;

@@ -1136,6 +1137,8 @@ static int vc4_hdmi_audio_hw_params(struct snd_pcm_substream *substream, HDMI_WRITE(HDMI_AUDIO_PACKET_CONFIG, audio_packet_config); vc4_hdmi_set_n_cts(vc4_hdmi);

• vc4_hdmi_set_audio_infoframe(encoder);
• return 0;

}

@@ -1143,11 +1146,9 @@ static int vc4_hdmi_audio_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct vc4_hdmi *vc4_hdmi = dai_to_hdmi(dai);

• struct drm_encoder *encoder = &vc4_hdmi->encoder.base.base;

  switch (cmd) { case SNDRV_PCM_TRIGGER_START:

• vc4_hdmi_set_audio_infoframe(encoder);
  

  vc4_hdmi->audio.streaming = true;

  if (vc4_hdmi->variant->phy_rng_enable)

-- 2.26.2