From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Imre Deak <imre.deak@intel.com>
Cc: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org,
stable@vger.kernel.org
Subject: Re: [PATCH v2] drm/i915/dp_mst: Work around Thunderbolt sink disconnect after SINK_COUNT_ESI read
Date: Mon, 19 May 2025 16:39:51 +0300 [thread overview]
Message-ID: <20250519133951.GD88033@black.fi.intel.com> (raw)
In-Reply-To: <20250519133417.1469181-1-imre.deak@intel.com>
On Mon, May 19, 2025 at 04:34:17PM +0300, Imre Deak wrote:
> Due to a problem in the iTBT DP-in adapter's firmware the sink on a TBT
> link may get disconnected inadvertently if the SINK_COUNT_ESI and the
> DP_LINK_SERVICE_IRQ_VECTOR_ESI0 registers are read in a single AUX
> transaction. Work around the issue by reading these registers in
> separate transactions.
>
> The issue affects MTL+ platforms and will be fixed in the DP-in adapter
> firmware, however releasing that firmware fix may take some time and is
> not guaranteed to be available for all systems. Based on this apply the
> workaround on affected platforms.
>
> See HSD #13013007775.
>
> v2: Cc'ing Mika Westerberg.
>
> Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/13760
> Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14147
> Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
next prev parent reply other threads:[~2025-05-19 13:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-16 17:09 [PATCH] drm/i915/dp_mst: Work around Thunderbolt sink disconnect after SINK_COUNT_ESI read Imre Deak
2025-05-19 13:34 ` [PATCH v2] " Imre Deak
2025-05-19 13:39 ` Mika Westerberg [this message]
2025-05-19 13:53 ` Jani Nikula
2025-05-19 13:55 ` Imre Deak
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