linux-kernel - [PATCH 0/3] Fixes and enhancements for Exynos (7870) DSIM bridge driver

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Message-Id: <20260124-exynos-dsim-fixes-v1-0-122d047a23d1@disroot.org>
Date: Sat, 24 Jan 2026 22:50:45 +0530
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Inki Dae <inki.dae@...sung.com>, 
 Jagan Teki <jagan@...rulasolutions.com>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Kaustabh Chakraborty <kauschluss@...root.org>, stable@...r.kernel.org
Subject: [PATCH 0/3] Fixes and enhancements for Exynos (7870) DSIM bridge
 driver

Since v6.17, there were a few regressive changes for the Exynos 7870
DSIM driver. These changes resulted in weird artifacts on the display,
such as random RGB channel swaps and random aberration (the occurrences
of both were mutually exclusive).

The first two commits of this patch series address the aforementioned
changes.

The third patch replaces an implicit loop for waiting for PLL
stabilization with an interrupt-based solution, which should be more
reliable. This solution was suggested by Inki Dae in a discussion of an
earlier patch series sent by me. For further details, refer to its
commit description.

Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
---
Kaustabh Chakraborty (3):
      drm/bridge: samsung-dsim: move bridge init sequence to atomic_enable
      drm/bridge: samsung-dsim: enable MFLUSH_VS for Exynos 7870 DSIM
      drm/bridge: samsung-dsim: use DSIM interrupt to wait for PLL stability

 drivers/gpu/drm/bridge/samsung-dsim.c | 61 +++++++++++++++++++++++------------
 include/drm/bridge/samsung-dsim.h     |  1 +
 2 files changed, 42 insertions(+), 20 deletions(-)
---
base-commit: ca3a02fda4da8e2c1cb6baee5d72352e9e2cfaea
change-id: 20260124-exynos-dsim-fixes-5383d6a6f073

Best regards,
-- 
Kaustabh Chakraborty <kauschluss@...root.org>