6.6-stable review patch. If anyone has any objections, please let me know.
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From: Mohan Kumar mkumard@nvidia.com
[ Upstream commit 6781b962d97bc52715a8db8cc17278cc3c23ebe8 ]
When Tegra audio drivers are built as part of the kernel image, TIMEOUT_ERR is observed from cbb-fabric. Following is seen on Jetson AGX Orin during boot:
[ 8.012482] ************************************** [ 8.017423] CPU:0, Error:cbb-fabric, Errmon:2 [ 8.021922] Error Code : TIMEOUT_ERR [ 8.025966] Overflow : Multiple TIMEOUT_ERR [ 8.030644] [ 8.032175] Error Code : TIMEOUT_ERR [ 8.036217] MASTER_ID : CCPLEX [ 8.039722] Address : 0x290a0a8 [ 8.043318] Cache : 0x1 -- Bufferable [ 8.047630] Protection : 0x2 -- Unprivileged, Non-Secure, Data Access [ 8.054628] Access_Type : Write
[ 8.106130] WARNING: CPU: 0 PID: 124 at drivers/soc/tegra/cbb/tegra234-cbb.c:604 tegra234_cbb_isr+0x134/0x178
[ 8.240602] Call trace: [ 8.243126] tegra234_cbb_isr+0x134/0x178 [ 8.247261] __handle_irq_event_percpu+0x60/0x238 [ 8.252132] handle_irq_event+0x54/0xb8
These errors happen when MVC device, which is a child of AHUB device, tries to access its device registers. This happens as part of call tegra210_mvc_reset_vol_settings() in MVC device probe().
The root cause of this problem is, the child MVC device gets probed before the AHUB clock gets enabled. The AHUB clock is enabled in runtime PM resume of parent AHUB device and due to the wrong sequence of pm_runtime_enable() in AHUB driver, runtime PM resume doesn't happen for AHUB device when MVC makes register access.
Fix this by calling pm_runtime_enable() for parent AHUB device before of_platform_populate() in AHUB driver. This ensures that clock becomes available when MVC makes register access.
Fixes: 16e1bcc2caf4 ("ASoC: tegra: Add Tegra210 based AHUB driver") Signed-off-by: Mohan Kumar mkumard@nvidia.com Signed-off-by: Ritu Chaudhary rituc@nvidia.com Signed-off-by: Sameer Pujar spujar@nvidia.com Link: https://patch.msgid.link/20240823144342.4123814-3-spujar@nvidia.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/tegra/tegra210_ahub.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/sound/soc/tegra/tegra210_ahub.c b/sound/soc/tegra/tegra210_ahub.c index 3f114a2adfce..ab3c6b2544d2 100644 --- a/sound/soc/tegra/tegra210_ahub.c +++ b/sound/soc/tegra/tegra210_ahub.c @@ -2,7 +2,7 @@ // // tegra210_ahub.c - Tegra210 AHUB driver // -// Copyright (c) 2020-2022, NVIDIA CORPORATION. All rights reserved. +// Copyright (c) 2020-2024, NVIDIA CORPORATION. All rights reserved.
#include <linux/clk.h> #include <linux/device.h> @@ -1391,11 +1391,13 @@ static int tegra_ahub_probe(struct platform_device *pdev) return err; }
+ pm_runtime_enable(&pdev->dev); + err = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); - if (err) + if (err) { + pm_runtime_disable(&pdev->dev); return err; - - pm_runtime_enable(&pdev->dev); + }
return 0; }