From: Philipp Zabel <p.zabel@pengutronix.de>
To: Jacky Bai <ping.bai@nxp.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Lucas Stach <l.stach@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
imx@lists.linux.dev, devicetree@vger.kernel.org,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3] pmdomain: imx: gpcv2: Fix the imx8mm gpu hang due to wrong adb400 reset
Date: Sat, 24 Jan 2026 21:37:37 +0100 [thread overview]
Message-ID: <aXUtkR0J0cK98ZQQ@pengutronix.de> (raw)
In-Reply-To: <20260123-imx8mm_gpu_power_domain-v3-1-3752618050c9@nxp.com>
On Fri, Jan 23, 2026 at 10:51:26AM +0800, Jacky Bai wrote:
> On i.MX8MM, the GPUMIX, GPU2D, and GPU3D blocks share a common reset
> domain. Due to this hardware limitation, powering off/on GPU2D or GPU3D
> also triggers a reset of the GPUMIX domain, including its ADB400 port.
> However, the ADB400 interface must always be placed into power‑down mode
> before being reset.
>
> Currently the GPUMIX and GPU2D/3D power domains rely on runtime PM to
> handle dependency ordering. In some corner cases, the GPUMIX power off
> sequence is skipped, leaving the ADB400 port active when GPU2D/3D reset.
> This causes the GPUMIX ADB400 port to be reset while still active,
> leading to unpredictable bus behavior and GPU hangs.
>
> To avoid this, refine the power‑domain control logic so that the GPUMIX
> ADB400 port is explicitly powered down and powered up as part of the GPU
> power domain on/off sequence. This ensures proper ordering and prevents
> incorrect ADB400 reset.
>
> Suggested-by: Lucas Stach <l.stach@pengutronix.de>
> Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
This fixes a sporadic system freeze after a few hours of alternating
between GPU activity and GPU runtime suspend that I could reproduce on
i.MX8MM since commit 055467378bf1 ("driver core: Enable fw_devlink=rpm
by default").
regards
Philipp
next prev parent reply other threads:[~2026-01-24 20:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-23 2:51 [PATCH v3] pmdomain: imx: gpcv2: Fix the imx8mm gpu hang due to wrong adb400 reset Jacky Bai
2026-01-24 20:37 ` Philipp Zabel [this message]
2026-01-24 21:20 ` Fabio Estevam
2026-01-26 9:21 ` Lucas Stach
2026-01-27 14:27 ` Ulf Hansson
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