linux-kernel - Re: [PATCH v4 00/13] Apply drm_bridge_connector and panel

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Message-ID: <6ec86839-2d81-491b-a9fa-b44bb6db8fbf@rock-chips.com>
Date: Fri, 15 Aug 2025 10:04:05 +0800
From: Damon Ding <damon.ding@...k-chips.com>
To: Marek Szyprowski <m.szyprowski@...sung.com>, andrzej.hajda@...el.com,
 neil.armstrong@...aro.org, rfoss@...nel.org
Cc: Laurent.pinchart@...asonboard.com, jonas@...boo.se,
 jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch,
 jingoohan1@...il.com, inki.dae@...sung.com, sw0312.kim@...sung.com,
 kyungmin.park@...sung.com, krzk@...nel.org, alim.akhtar@...sung.com,
 hjc@...k-chips.com, heiko@...ech.de, andy.yan@...k-chips.com,
 dmitry.baryshkov@....qualcomm.com, l.stach@...gutronix.de,
 dianders@...omium.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 00/13] Apply drm_bridge_connector and panel_bridge
 helper for the Analogix DP driver

Hi Marek,

On 2025/8/14 22:33, Marek Szyprowski wrote:
> On 14.08.2025 12:47, Damon Ding wrote:
>> PATCH 1 is a small format optimization for struct analogid_dp_device.
>> PATCH 2 is to perform mode setting in &drm_bridge_funcs.atomic_enable.
>> PATCH 3-6 are preparations for apply drm_bridge_connector helper.
>> PATCH 7 is to apply the drm_bridge_connector helper.
>> PATCH 8-10 are to move the panel/bridge parsing to the Analogix side.
>> PATCH 11-12 are preparations for apply panel_bridge helper.
>> PATCH 13 is to apply the panel_bridge helper.
> 
> This series lacks 'select DRM_BRIDGE_CONNECTOR' in ExynosDP's Kconfig,
> so it causes build break:
> 

> drivers/gpu/drm/exynos/exynos_dp.c:177: undefined reference to
> `drm_bridge_connector_init'
> make[2]: *** [scripts/Makefile.vmlinux:91: vmlinux] Error 1
> 
> After adding this dependency, the Exynos DP driver stops working. On
> Samsung Snow Chromebook I observed following issue:
> 
> [    4.534220] exynos-dp 145b0000.dp-controller: failed to attach
> following panel or bridge (-16)
> [    4.543428] exynos-drm exynos-drm: failed to bind
> 145b0000.dp-controller (ops exynos_dp_ops): -16
> [    4.551775] exynos-drm exynos-drm: adev bind failed: -16
> [    4.556559] exynos-dp 145b0000.dp-controller: probe with driver
> exynos-dp failed with error -16
> 
> I will investigate details later in the evening.
> 

Thanks for your review and test. :-)

I found the Rockchip side also lacks 'select DRM_BRIDGE_CONNECTOR' in 
ROCKCHIP_ANALOGIX_DP's Kconfig. I will add the DRM_BRIDGE_CONNECTOR 
selection for both of them in the next version.

>> Damon Ding (13):
>>     drm/bridge: analogix_dp: Formalize the struct analogix_dp_device
>>     drm/bridge: analogix_dp: Move &drm_bridge_funcs.mode_set to
>>       &drm_bridge_funcs.atomic_enable
>>     drm/bridge: analogix_dp: Add &analogix_dp_plat_data.next_bridge
>>     drm/exynos: exynos_dp: Remove &exynos_dp_device.ptn_bridge
>>     drm/bridge: exynos_dp: Remove unused &exynos_dp_device.connector
>>     drm/bridge: analogix_dp: Remove redundant
>>       &analogix_dp_plat_data.skip_connector
>>     drm/bridge: analogix_dp: Apply drm_bridge_connector helper
>>     drm/bridge: analogix_dp: Add new API analogix_dp_finish_probe()
>>     drm/rockchip: analogix_dp: Apply analogix_dp_finish_probe()
>>     drm/exynos: exynos_dp: Apply analogix_dp_finish_probe()
>>     drm/bridge: analogix_dp: Remove panel disabling and enabling in
>>       analogix_dp_set_bridge()
>>     drm/bridge: analogix_dp: Remove bridge disabing and panel unpreparing
>>       in analogix_dp_unbind()
>>     drm/bridge: analogix_dp: Apply panel_bridge helper
>>
>>    .../drm/bridge/analogix/analogix_dp_core.c    | 384 ++++++++++--------
>>    .../drm/bridge/analogix/analogix_dp_core.h    |   5 +-
>>    drivers/gpu/drm/exynos/exynos_dp.c            |  48 +--
>>    .../gpu/drm/rockchip/analogix_dp-rockchip.c   |  49 +--
>>    include/drm/bridge/analogix_dp.h              |   7 +-
>>    5 files changed, 248 insertions(+), 245 deletions(-)
>>
>> ---
>>
>> Changes in v2:
>> - Update Exynos DP driver synchronously.
>> - Move the panel/bridge parsing to the Analogix side.
>>
>> Changes in v3:
>> - Rebase for the existing devm_drm_bridge_alloc() applying commit.
>> - Fix the typographical error of panel/bridge check in exynos_dp_bind().
>> - Squash all commits related to skip_connector deletion in both Exynos and
>>     Analogix code into one.
>> - Apply panel_bridge helper to make the codes more concise.
>> - Fix the handing of bridge in analogix_dp_bridge_get_modes().
>> - Remove unnecessary parameter struct drm_connector* for callback
>>     &analogix_dp_plat_data.attach().
>> - In order to decouple the connector driver and the bridge driver, move
>>     the bridge connector initilization to the Rockchip and Exynos sides.
>>
>> Changes in v4:
>> - Rebase for the applied &drm_bridge_funcs.detect() modification commit.
>> - Rename analogix_dp_find_panel_or_bridge() to analogix_dp_finish_probe().
>> - Drop the drmm_encoder_init() modification commit.
>> - Rename the &analogix_dp_plat_data.bridge to
>>     &analogix_dp_plat_data.next_bridge.
>>
> Best regards

Best regards,
Damon