linux-kernel - Re: [PATCH V3 1/1] phy: tegra: xusb: Use a bitmask for UTMI pad power state tracking

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Message-Id: <174437341497.673813.4496801277326172956.b4-ty@kernel.org>
Date: Fri, 11 Apr 2025 17:40:14 +0530
From: Vinod Koul <vkoul@...nel.org>
To: jonathanh@...dia.com, thierry.reding@...il.com, jckuo@...dia.com, 
 kishon@...nel.org, Wayne Chang <waynec@...dia.com>
Cc: linux-phy@...ts.infradead.org, linux-tegra@...r.kernel.org, 
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH V3 1/1] phy: tegra: xusb: Use a bitmask for UTMI pad
 power state tracking


On Tue, 08 Apr 2025 11:09:05 +0800, Wayne Chang wrote:
> The current implementation uses bias_pad_enable as a reference count to
> manage the shared bias pad for all UTMI PHYs. However, during system
> suspension with connected USB devices, multiple power-down requests for
> the UTMI pad result in a mismatch in the reference count, which in turn
> produces warnings such as:
> 
> [  237.762967] WARNING: CPU: 10 PID: 1618 at tegra186_utmi_pad_power_down+0x160/0x170
> [  237.763103] Call trace:
> [  237.763104]  tegra186_utmi_pad_power_down+0x160/0x170
> [  237.763107]  tegra186_utmi_phy_power_off+0x10/0x30
> [  237.763110]  phy_power_off+0x48/0x100
> [  237.763113]  tegra_xusb_enter_elpg+0x204/0x500
> [  237.763119]  tegra_xusb_suspend+0x48/0x140
> [  237.763122]  platform_pm_suspend+0x2c/0xb0
> [  237.763125]  dpm_run_callback.isra.0+0x20/0xa0
> [  237.763127]  __device_suspend+0x118/0x330
> [  237.763129]  dpm_suspend+0x10c/0x1f0
> [  237.763130]  dpm_suspend_start+0x88/0xb0
> [  237.763132]  suspend_devices_and_enter+0x120/0x500
> [  237.763135]  pm_suspend+0x1ec/0x270
> 
> [...]

Applied, thanks!

[1/1] phy: tegra: xusb: Use a bitmask for UTMI pad power state tracking
      commit: b47158fb42959c417ff2662075c0d46fb783d5d1

Best regards,
-- 
~Vinod