linux-kernel - [PATCH 0/3] drm: zynqmp_dp: Retrain link after HPD if necessary

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251024191707.2310589-1-sean.anderson@linux.dev>
Date: Fri, 24 Oct 2025 15:17:04 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org,
	David Airlie <airlied@...il.com>,
	Hyun Kwon <hyun.kwon@...inx.com>,
	Simona Vetter <simona@...ll.ch>,
	Michal Simek <michal.simek@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH 0/3] drm: zynqmp_dp: Retrain link after HPD if necessary

I noticed that after reconnecting a mini-displayport cable, the sink
would not display an image. But if I forced the link to re-train, the
image would come back.

Some digging revealed that the DP spec requires retraining after a HPD
event if the sink syas the link has gone down. So implement that since
it fixes my problem and it's required by spec.


Sean Anderson (3):
  drm: zynqmp_dp: Update connector state before AUX transfers
  drm: zynqmp_dp: Use smp_load/store for status
  drm: zynqmp_dp: Retrain link after HPD if necessary

 drivers/gpu/drm/xlnx/zynqmp_dp.c | 43 +++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 17 deletions(-)

-- 
2.35.1.1320.gc452695387.dirty