linux-kernel - [PATCH v2 00/11] media: iris: migrate to using global UBWC config

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Message-Id: <20260113-iris-ubwc-v2-0-4346a6ef07a9@oss.qualcomm.com>
Date: Tue, 13 Jan 2026 18:57:15 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Akhil P Oommen <akhilpo@....qualcomm.com>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Bryan O'Donoghue <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-media@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: [PATCH v2 00/11] media: iris: migrate to using global UBWC config

Having UBWC configuration in the driver is error prone. For example, the
driver specifies fixed values for HBB, while the actual value might
depend on the DDR type. Stop defining UBWC data in the iris driver and
use the global UBWC configuration registry.

Merge strategy: either merge SoC bits directly through the media tree
(with Bjorn's ack) or merge to the media tree through the immutable tag.
The drm patches will follow depending on the way the SoC patches are
merged.

Note: the patches are compile-tested only because of the lack of the
Gen2 hardware at hand.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Changes in v2:
- Extended the commit message and added a comment for the min_acc length
  helper (Konrad)
- Link to v1: https://lore.kernel.org/r/20260110-iris-ubwc-v1-0-dd70494dcd7b@oss.qualcomm.com

---
Dmitry Baryshkov (11):
      soc: qcom: ubwc: add missing include
      soc: qcom: ubwc: add helper to get min_acc length
      media: iris: retrieve UBWC platform configuration
      media: iris: don't specify min_acc_length in the source code
      media: iris: don't specify highest_bank_bit in the source code
      media: iris: don't specify ubwc_swizzle in the source code
      media: iris: don't specify bank_spreading in the source code
      media: iris: don't specify max_channels in the source code
      media: iris: drop remnants of UBWC configuration
      drm/msm/mdss: use new helper to set min_acc length
      drm/msm/a6xx: use new helper to set min_acc length

 drivers/gpu/drm/msm/adreno/a6xx_gpu.c                   |  5 ++---
 drivers/gpu/drm/msm/msm_mdss.c                          |  6 ++----
 drivers/media/platform/qcom/iris/Kconfig                |  1 +
 drivers/media/platform/qcom/iris/iris_core.h            |  4 ++++
 drivers/media/platform/qcom/iris/iris_hfi_gen2_packet.c | 17 ++++++++++-------
 drivers/media/platform/qcom/iris/iris_platform_common.h | 11 -----------
 drivers/media/platform/qcom/iris/iris_platform_gen2.c   | 14 --------------
 drivers/media/platform/qcom/iris/iris_probe.c           |  5 +++++
 include/linux/soc/qcom/ubwc.h                           | 11 +++++++++++
 9 files changed, 35 insertions(+), 39 deletions(-)
---
base-commit: 0f853ca2a798ead9d24d39cad99b0966815c582a
change-id: 20260110-iris-ubwc-06f64cbb31ae

Best regards,
-- 
With best wishes
Dmitry