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

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Message-ID: <20220905172420.3801-1-mkumard@nvidia.com>
Date:   Mon, 5 Sep 2022 22:54:20 +0530
From:   Mohan Kumar <mkumard@...dia.com>
To:     <tiwai@...e.com>, <perex@...ex.cz>, <thierry.reding@...il.com>
CC:     <jonathanh@...dia.com>, <linux-tegra@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        Mohan Kumar <mkumard@...dia.com>
Subject: [PATCH] ALSA: hda/tegra: Align BDL entry to 4KB boundary

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>
---
 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 7debb2c76aa6..976a112c7d00 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -474,7 +474,8 @@ 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;
-- 
2.17.1