linux-kernel - [PATCH 2/2] phy: tegra: xusb: Disable periodic tracking on Tegra234

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Message-ID: <20250507024820.1648733-3-waynec@nvidia.com>
Date: Wed, 7 May 2025 10:48:20 +0800
From: Wayne Chang <waynec@...dia.com>
To: <waynec@...dia.com>, <jckuo@...dia.com>, <vkoul@...nel.org>,
	<kishon@...nel.org>, <thierry.reding@...il.com>, <jonathanh@...dia.com>
CC: <linux-phy@...ts.infradead.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Haotien Hsu <haotienh@...dia.com>,
	<stable@...r.kernel.org>
Subject: [PATCH 2/2] phy: tegra: xusb: Disable periodic tracking on Tegra234

From: Haotien Hsu <haotienh@...dia.com>

Periodic calibration updates (~10µs) may overlap with transfers when
PCIe NVMe SSD, LPDDR, and USB2 devices operate simultaneously, causing
crosstalk on Tegra234 devices. Hence disable periodic calibration updates
and make this a one-time calibration.

Fixes: d8163a32ca95 ("phy: tegra: xusb: Add Tegra234 support")
Cc: stable@...r.kernel.org
Signed-off-by: Haotien Hsu <haotienh@...dia.com>
Signed-off-by: Wayne Chang <waynec@...dia.com>
---
 drivers/phy/tegra/xusb-tegra186.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
index dd0aaf305e90..414f4eabfe9d 100644
--- a/drivers/phy/tegra/xusb-tegra186.c
+++ b/drivers/phy/tegra/xusb-tegra186.c
@@ -1703,7 +1703,7 @@ const struct tegra_xusb_padctl_soc tegra234_xusb_padctl_soc = {
 	.num_supplies = ARRAY_SIZE(tegra194_xusb_padctl_supply_names),
 	.supports_gen2 = true,
 	.poll_trk_completed = true,
-	.trk_hw_mode = true,
+	.trk_hw_mode = false,
 	.trk_update_on_idle = true,
 	.supports_lp_cfg_en = true,
 };
-- 
2.25.1