linux-kernel - [PATCH AUTOSEL 5.15 09/16] ALSA: hda/tegra: Align BDL entry to 4KB boundary

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Date:   Wed, 14 Sep 2022 05:02:17 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mohan Kumar <mkumard@...dia.com>, Takashi Iwai <tiwai@...e.de>,
        Sasha Levin <sashal@...nel.org>, perex@...ex.cz,
        tiwai@...e.com, thierry.reding@...il.com, jonathanh@...dia.com,
        digetx@...il.com, spujar@...dia.com, alsa-devel@...a-project.org,
        linux-tegra@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 09/16] ALSA: hda/tegra: Align BDL entry to 4KB boundary

From: Mohan Kumar <mkumard@...dia.com>

[ Upstream commit 8d44e6044a0e885acdd01813768a0b27906d64fd ]

AZA HW may send a burst read/write request crossing 4K memory boundary.
The 4KB boundary is not guaranteed by Tegra HDA HW. Make SW change to
include the flag AZX_DCAPS_4K_BDLE_BOUNDARY to align BDLE to 4K
boundary.

Signed-off-by: Mohan Kumar <mkumard@...dia.com>
Link: https://lore.kernel.org/r/20220905172420.3801-1-mkumard@nvidia.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/pci/hda/hda_tegra.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index 773f4903550a0..f0e556f2ccf69 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -451,7 +451,8 @@ MODULE_DEVICE_TABLE(of, hda_tegra_match);
 static int hda_tegra_probe(struct platform_device *pdev)
 {
 	const unsigned int driver_flags = AZX_DCAPS_CORBRP_SELF_CLEAR |
-					  AZX_DCAPS_PM_RUNTIME;
+					  AZX_DCAPS_PM_RUNTIME |
+					  AZX_DCAPS_4K_BDLE_BOUNDARY;
 	struct snd_card *card;
 	struct azx *chip;
 	struct hda_tegra *hda;
-- 
2.35.1