linux-kernel - [PATCH v2 0/3] drm: zynqmp_dp: Retrain link after HPD if necessary

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Message-Id: <20251030203642.3076656-1-sean.anderson@linux.dev>
Date: Thu, 30 Oct 2025 16:36:39 -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: Michal Simek <michal.simek@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Simona Vetter <simona@...ll.ch>,
	David Airlie <airlied@...il.com>,
	linux-kernel@...r.kernel.org,
	Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH v2 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.

Changes in v2:
- needs_retain -> needs_retrain
- Actually retrain the loop (accidentally removed while rebasing)

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 | 44 ++++++++++++++++++++------------
 1 file changed, 27 insertions(+), 17 deletions(-)

-- 
2.35.1.1320.gc452695387.dirty