linux-kernel - [PATCH] ALSA: hda: Increase default bdl_pos

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Date: Mon, 22 Jan 2024 09:23:39 +0000
From: Rui Salvaterra <rsalvaterra@...il.com>
To: tiwai@...e.com
Cc: linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Rui Salvaterra <rsalvaterra@...il.com>
Subject: [PATCH] ALSA: hda: Increase default bdl_pos_adj for Apollo Lake

Apollo Lake seems to also suffer from IRQ timing issues. After being up for ~4
minutes, a Pentium N4200 system ends up falling back to workqueue-based IRQ
handling:

[  208.019906] snd_hda_intel 0000:00:0e.0: IRQ timing workaround is activated
for card #0. Suggest a bigger bdl_pos_adj.

Unfortunately, the Baytrail and Braswell workaround value of 32 samples isn't
enough to fix the issue here. Default to 64 samples.

Signed-off-by: Rui Salvaterra <rsalvaterra@...il.com>
---
 sound/pci/hda/hda_intel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 2276adc84478..9fb54813693c 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1732,6 +1732,8 @@ static int default_bdl_pos_adj(struct azx *chip)
 		case 0x0f04: /* Baytrail */
 		case 0x2284: /* Braswell */
 			return 32;
+		case 0x5a98: /* Apollo Lake */
+			return 64;
 		}
 	}

-- 
2.43.0