linux-kernel - [PATCH 1/3] soc/tegra: cbb: set ERD on resume for err interrupt

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Message-ID: <20260121101205.3186310-2-sumitg@nvidia.com>
Date: Wed, 21 Jan 2026 15:42:03 +0530
From: Sumit Gupta <sumitg@...dia.com>
To: <treding@...dia.com>, <jonathanh@...dia.com>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <bbasu@...dia.com>, <sumitg@...dia.com>
Subject: [PATCH 1/3] soc/tegra: cbb: set ERD on resume for err interrupt

Set the Error Response Disable (ERD) bit to mask SError responses
and use interrupt-based error reporting. When the ERD bit is set,
inband error responses to the initiator via SError are suppressed,
and fabric errors are reported via an interrupt instead.

The register is set during boot but the info is lost during system
suspend and needs to be set again on resume.

Fixes: fc2f151d2314 ("soc/tegra: cbb: Add driver for Tegra234 CBB 2.0")
Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 drivers/soc/tegra/cbb/tegra234-cbb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/soc/tegra/cbb/tegra234-cbb.c b/drivers/soc/tegra/cbb/tegra234-cbb.c
index a9adbcecd47c..518733a06658 100644
--- a/drivers/soc/tegra/cbb/tegra234-cbb.c
+++ b/drivers/soc/tegra/cbb/tegra234-cbb.c
@@ -1586,6 +1586,10 @@ static int __maybe_unused tegra234_cbb_resume_noirq(struct device *dev)
 {
 	struct tegra234_cbb *cbb = dev_get_drvdata(dev);
 
+	/* set ERD bit to mask SError and generate interrupt to report error */
+	if (cbb->fabric->off_mask_erd)
+		tegra234_cbb_mask_serror(cbb);
+
 	tegra234_cbb_error_enable(&cbb->base);
 
 	dev_dbg(dev, "%s resumed\n", cbb->fabric->fab_list[cbb->fabric->fab_id].name);
-- 
2.34.1