linux-kernel - [PATCH v3 0/3] drm/msm/dsi: Add support to 2 panels in bonded-DSI mode

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Message-Id: <20250924-dsi-dual-panel-upstream-v3-0-6927284f1098@linaro.org>
Date: Wed, 24 Sep 2025 23:08:09 +0800
From: Jun Nie <jun.nie@...aro.org>
To: Rob Clark <robin.clark@....qualcomm.com>, 
 Abhinav Kumar <abhinav.kumar@...ux.dev>, 
 Jessica Zhang <jessica.zhang@....qualcomm.com>, 
 Dmitry Baryshkov <lumag@...nel.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Krishna Manikandan <quic_mkrishn@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Jun Nie <jun.nie@...aro.org>, 
 Jonathan Marek <jonathan@...ek.ca>
Subject: [PATCH v3 0/3] drm/msm/dsi: Add support to 2 panels in bonded-DSI
 mode

The 2 DSI interfaces may be connected to 2 independent panels in bonded-DSI
mode. Horizontal timing and DSC configuration are adjusted per individual
panel in DSI host side. Support to multiple slice per packet is added for
the device setup to test the usage case.

Changes vs v2:
- Polish commit message to describe usage case and requirements to
  panel driver.
- Remove changes in device tree and add dual_panel flag in mipi_dsi_device
  to pass information from panel to dsi host.
- Drop the register programming to DSI_VBIF_CTRL, as no issue is seen
  in latest test.
- Link to v2: https://lore.kernel.org/r/20250220-dual-dsi-v2-0-6c0038d5a2ef@linaro.org

Change vs v1:
- Add device tree binding for dual panel case in handling frame width for
  DSC to avoid breaking existing dual-DSI case.
- Leverage Marijn's patch to configure proper slice per interface in
  dsi_update_dsc_timing().
- Polish commit comments.
- Link to v1: https://lore.kernel.org/all/20240829-sm8650-v6-11-hmd-pocf-mdss-quad-upstream-8-v1-0-bdb05b4b5a2e@linaro.org/

Signed-off-by: Jun Nie <jun.nie@...aro.org>
---
Jun Nie (3):
      drm/msm/dsi: support DSC configurations with slice_per_pkt > 1
      drm/mipi-dsi: Add flag to support dual-panel configurations
      drm/msm/dsi: Support dual panel use case with single CRTC

 drivers/gpu/drm/msm/dsi/dsi_host.c | 35 +++++++++++++++++++----------------
 include/drm/drm_mipi_dsi.h         |  4 ++++
 2 files changed, 23 insertions(+), 16 deletions(-)
---
base-commit: a3306041f55d0f86c40d06eaad1d4e8f06e4483d
change-id: 20250924-dsi-dual-panel-upstream-4aded63bd2d5

Best regards,
-- 
Jun Nie <jun.nie@...aro.org>