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Message-ID: <47619a02-c667-4fd0-afa9-f6cf7aba8dd4@sirena.org.uk>
Date: Tue, 27 Jan 2026 19:50:25 +0000
From: Mark Brown <broonie@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: 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>,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
Maíra Canal <mcanal@...lia.com>,
Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
Chen-Yu Tsai <wens@...nel.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
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>, Liu Ying <victor.liu@....com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
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>,
Sandy Huang <hjc@...k-chips.com>,
Heiko Stübner <heiko@...ech.de>,
Andy Yan <andy.yan@...k-chips.com>, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-sunxi@...ts.linux.dev, linux-mediatek@...ts.infradead.org,
linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
linux-rockchip@...ts.infradead.org, Aishwarya.TCV@....com
Subject: Re: [PATCH v4 05/10] drm/bridge: refactor HDMI InfoFrame callbacks
On Wed, Jan 07, 2026 at 08:15:02PM +0200, Dmitry Baryshkov wrote:
> Having only a single set of callbacks, hdmi_clear_infoframe and
> hdmi_write_infoframe, bridge drivers don't have an easy way to signal to
> the DRM framework, which InfoFrames are actually supported by the
> hardware and by the driver and which are not. Also, it makes it
We're seeing oopses on Qualcomm RB5 platforms in -next which bisect to
this patch. Looking at the patch I'm not immediately seeing what it
might be getting wrong, though I do note that the board uses a LT9611
which is updated by the patch.
Failure log:
3853 01:47:31.278489 <3>[ 21.045573] msm_dpu ae01000.display-controller: [drm:msm_dsi_modeset_init [msm]] *ERROR* failed to create dsi connector: -22
3854 01:47:31.280977 <3>[ 21.057526] [drm:_dpu_kms_initialize_dsi:630] [dpu error]modeset_init failed for dsi[0], rc = -22
3855 01:47:31.322994 <3>[ 21.066927] [drm:_dpu_kms_setup_displays:766] [dpu error]initialize_dsi failed, rc = -22
3856 01:47:31.323293 <3>[ 21.075563] [drm:dpu_kms_hw_init:1283] [dpu error]modeset init failed: -22
3857 01:47:31.323577 <3>[ 21.083223] msm_dpu ae01000.display-controller: [drm:msm_drm_kms_init [msm]] *ERROR* kms hw init failed: -22
3858 01:47:31.323809 <1>[ 21.094033] Unable to handle kernel paging request at virtual address dead000000000108
...
3882 01:47:31.547579 <4>[ 21.252828] Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)
...
3901 01:47:31.678351 <4>[ 21.462030] Call trace:
3902 01:47:31.721776 <4>[ 21.464819] drm_atomic_private_obj_fini+0x24/0x70 [drm] (P)
3903 01:47:31.722072 <4>[ 21.470924] _dpu_kms_hw_destroy+0x4c/0x64 [msm]
3904 01:47:31.722309 <4>[ 21.475969] dpu_kms_destroy+0x28/0xb0 [msm]
3905 01:47:31.722528 <4>[ 21.480650] msm_drm_kms_uninit+0xac/0xd8 [msm]
3906 01:47:31.722743 <4>[ 21.485596] msm_drm_uninit.isra.0+0x54/0xd4 [msm]
3907 01:47:31.722968 <4>[ 21.490816] msm_drm_init+0x18c/0x1f0 [msm]
3908 01:47:31.723228 <4>[ 21.495409] msm_drm_bind+0x30/0x3c [msm]
3909 01:47:31.723442 <4>[ 21.499824] try_to_bring_up_aggregate_device+0x164/0x1d0
3910 01:47:31.723646 <4>[ 21.505635] __component_add+0xa4/0x170
3911 01:47:31.725046 <4>[ 21.509851] component_add+0x14/0x20
3912 01:47:31.766295 <4>[ 21.513793] dsi_dev_attach+0x20/0x2c [msm]
3913 01:47:31.766592 <4>[ 21.518387] dsi_host_attach+0x58/0x98 [msm]
3914 01:47:31.766829 <4>[ 21.523068] devm_mipi_dsi_attach+0x34/0x90
3915 01:47:31.767113 <4>[ 21.527638] lt9611uxc_attach_dsi.isra.0+0x84/0x100 [lontium_lt9611uxc]
3916 01:47:31.767339 <4>[ 21.534701] lt9611uxc_probe+0x59c/0x62c [lontium_lt9611uxc]
bisect log:
git bisect start
# status: waiting for both good and bad commits
# good: [50814c5ce8d8f6751fd49c818abeb8853f8be2df] Merge branch 'for-linux-next-fixes' of https://gitlab.freedesktop.org/drm/misc/kernel.git
git bisect good 50814c5ce8d8f6751fd49c818abeb8853f8be2df
# status: waiting for bad commit, 1 good commit known
# bad: [615aad0f61e0c7a898184a394dc895c610100d4f] Add linux-next specific files for 20260126
git bisect bad 615aad0f61e0c7a898184a394dc895c610100d4f
# good: [b047f48069330e050431e9ad762bd838af43337f] Merge branch 'mtd/next' of https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git
git bisect good b047f48069330e050431e9ad762bd838af43337f
# bad: [fe1e00e6f9fe8a160921f6a87f999075a1dfef0a] Merge branch 'for-mfd-next' of https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git
git bisect bad fe1e00e6f9fe8a160921f6a87f999075a1dfef0a
# good: [9d10cd526111a989eb353c3a4df9d4c79695ea8d] Merge tag 'drm-intel-next-2026-01-15' of https://gitlab.freedesktop.org/drm/i915/kernel into drm-next
git bisect good 9d10cd526111a989eb353c3a4df9d4c79695ea8d
# bad: [7260b161359d310b9a92513dbd73cd9a3a226c6f] Merge branch 'for-next' of https://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394.git
git bisect bad 7260b161359d310b9a92513dbd73cd9a3a226c6f
# bad: [d1968cd2a0ecab805106e5e60613dd45b63d52d9] Merge branch 'drm-next' of https://gitlab.freedesktop.org/drm/kernel.git
git bisect bad d1968cd2a0ecab805106e5e60613dd45b63d52d9
# good: [d2f618b8fe76b565f6bc0071b5eeee07a9012c6d] Merge tag 'drm-intel-next-fixes-2026-01-22' of https://gitlab.freedesktop.org/drm/i915/kernel into drm-next
git bisect good d2f618b8fe76b565f6bc0071b5eeee07a9012c6d
# good: [fc23163a7ca6cc0e6c3297aed3bdc9428aa8b1a9] Merge branch 'master' of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
git bisect good fc23163a7ca6cc0e6c3297aed3bdc9428aa8b1a9
# skip: [00e6f8f60601b412e400873c8972f3e3802557f3] dt-bindings: vendor-prefixes: Add AlgolTek
git bisect skip 00e6f8f60601b412e400873c8972f3e3802557f3
# bad: [e5e1a0000746ded4d9fa16fceda0748aec2b6e6a] drm/bridge: samsung-dsim: samsung_dsim_host_attach: use a temporary variable for the next bridge
git bisect bad e5e1a0000746ded4d9fa16fceda0748aec2b6e6a
# bad: [0607052a6aee1e3d218a99fae70ba9f14b3b47ed] drm/hisilicon/hibmc: fix no showing problem with loading hibmc manually
git bisect bad 0607052a6aee1e3d218a99fae70ba9f14b3b47ed
# bad: [5a4e4e30f6dc4d2a68eec08257128906572f3346] drm/debug: don't register files for unsupported HDMI InfoFrames
git bisect bad 5a4e4e30f6dc4d2a68eec08257128906572f3346
# good: [638409979c5f7d3155afcded67532003e07a7d0e] drm/sun4i: hdmi_enc: implement clear_infoframe stub
git bisect good 638409979c5f7d3155afcded67532003e07a7d0e
# skip: [1d8847f457648ed4932019dcd3081bc27bcea936] drm/display: hdmi_state_helper: reject Audio IF updates if it's not supported
git bisect skip 1d8847f457648ed4932019dcd3081bc27bcea936
# bad: [e802c783be94bf71541a7e2ac8b1b5486aad10db] drm/display: hdmi_state_helper: split InfoFrame functions per type
git bisect bad e802c783be94bf71541a7e2ac8b1b5486aad10db
# good: [afc399f7a5ea7bf405b2ef85c7470529b1a9e47c] drm/connector: make clear_infoframe callback mandatory for HDMI connectors
git bisect good afc399f7a5ea7bf405b2ef85c7470529b1a9e47c
# bad: [b626b1a1c9ccadd8861870a2a450f02e0c61ab88] drm/bridge: refactor HDMI InfoFrame callbacks
git bisect bad b626b1a1c9ccadd8861870a2a450f02e0c61ab88
# first bad commit: [b626b1a1c9ccadd8861870a2a450f02e0c61ab88] drm/bridge: refactor HDMI InfoFrame callbacks
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