linux-kernel - [char-misc-next 0/5] mei: connect to card in D3cold

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Message-ID: <20250918130435.3327400-1-alexander.usyskin@intel.com>
Date: Thu, 18 Sep 2025 16:04:30 +0300
From: Alexander Usyskin <alexander.usyskin@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Reuven Abliyev <reuven.abliyev@...el.com>,
	Alexander Usyskin <alexander.usyskin@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [char-misc-next 0/5] mei: connect to card in D3cold

When discrete graphic card enters D3cold th CSC engine is powered down.

On wakeup from the D3cold full HECI link reset is required.
The driver should detect that firmware requests link reset and initiate
the link reset flow.

In the usual flow the connect IOCTL will trigger the wake from D3cold
and corresponding link reset.
The MEI driver invalidates all open handles on link reset including the
one that triggered the wake rendering this connection unusable.
To break this loop make connect detect that it is interrupted by link
reset and retry connect attempt after reset was completed.

Alexander Usyskin (5):
  mei: me: trigger link reset if hw ready is unexpected
  mei: make a local copy of client uuid in connect
  mei: retry connect if interrupted by link reset
  mei: bus: demote error on connect
  mei: gsc: demote unexpected reset print

 drivers/misc/mei/bus.c     |  2 +-
 drivers/misc/mei/hw-me.c   | 59 +++++++++++---------------------------
 drivers/misc/mei/hw.h      |  2 ++
 drivers/misc/mei/init.c    | 21 ++------------
 drivers/misc/mei/main.c    | 43 +++++++++++++++++++++------
 drivers/misc/mei/mei_dev.h | 12 ++++----
 6 files changed, 62 insertions(+), 77 deletions(-)

-- 
2.43.0