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From: "Mario Limonciello (AMD)" <superm1@kernel.org>
To: mario.limonciello@amd.com, airlied@gmail.com,
	alexander.deucher@amd.com, christian.koenig@amd.com,
	dakr@kernel.org, gregkh@linuxfoundation.org, lenb@kernel.org,
	pavel@kernel.org, rafael@kernel.org, simona@ffwll.ch
Cc: "Mario Limonciello (AMD)" <superm1@kernel.org>,
	amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-pm@vger.kernel.org
Subject: [RFC PATCH 0/3] Skip thaw sequence for all devices, not just amdgpu
Date: Mon, 13 Oct 2025 12:47:08 -0500	[thread overview]
Message-ID: <20251013174729.1101186-1-superm1@kernel.org> (raw)

As part of looking at the hibernate code recently again I was considering
whether we really need the thaw stage at all when things are working well.

So I wanted to explore what breaks if we just skip it.  This should speed
up the S4 sequence since nothing needs to resume.

If we do this we can drop the special cases in amdgpu and the exported
symbols too.

Mario Limonciello (3):
  PM: hibernate: Nominally skip thaw sequence for all devices
  drm/amd: Drop special cases for thaw() callback
  PM: Drop pm_hibernate_is_recovering() and
    pm_hibernation_mode_is_suspend()

 drivers/base/power/main.c               | 20 ++++++--------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c |  4 ----
 include/linux/suspend.h                 |  8 --------
 kernel/power/hibernate.c                | 24 ++++++++++--------------
 kernel/power/user.c                     |  3 +++
 5 files changed, 19 insertions(+), 40 deletions(-)

-- 
2.43.0


             reply	other threads:[~2025-10-13 18:04 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-13 17:47 Mario Limonciello (AMD) [this message]
2025-10-13 17:47 ` [RFC PATCH 1/3] PM: hibernate: Nominally skip thaw sequence for all devices Mario Limonciello (AMD)
2025-10-13 17:58   ` Rafael J. Wysocki
2025-10-13 18:27     ` Mario Limonciello
2025-10-13 18:29       ` Rafael J. Wysocki
2025-10-13 17:47 ` [RFC PATCH 2/3] drm/amd: Drop special cases for thaw() callback Mario Limonciello (AMD)
2025-10-13 17:47 ` [RFC PATCH 3/3] PM: Drop pm_hibernate_is_recovering() and pm_hibernation_mode_is_suspend() Mario Limonciello (AMD)

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