[PATCH v3 00/12] drm/imx/ipuv3: switch LDB and parallel-display driver to use drm_bridge_connector

[Chris Healy]

On an i.MX53 QSB with HDMI daughter board, this patch series is:

Tested-by: Chris Healy <cphealy at gmail.com>

HDMI output still works correctly and the bridges file reflects the changes:

Before:

root:/sys/kernel/debug/dri/display-subsystem/encoder-0 cat bridges
bridge[0]: 0xc0fa76d8
        type: [0] Unknown
        ops: [0x0]
bridge[1]: 0xc0fba03c
        type: [0] Unknown
        OF: /soc/bus at 60000000/i2c at 63fc4000/bridge-hdmi at 39:sil,sii9022
        ops: [0x7] detect edid hpd


After:

root:/sys/kernel/debug/dri/display-subsystem/encoder-0 cat bridges
bridge[0]: 0xc0fa76d8
        type: [0] Unknown
        ops: [0x0]
bridge[1]: 0xc0fb9f5c
        type: [0] Unknown
        OF: /soc/bus at 60000000/i2c at 63fc4000/bridge-hdmi at 39:sil,sii9022
        ops: [0x7] detect edid hpd
bridge[2]: 0xc0fb9794
        type: [11] HDMI-A
        OF: /connector-hdmi:hdmi-connector
        ops: [0x0]

On Sun, Jun 2, 2024 at 5:04 AM Dmitry Baryshkov
<dmitry.baryshkov at linaro.org> wrote:
>
> The IPUv3 DRM i.MX driver contains several codepaths for different
> usescases: both LDB and paralllel-display drivers handle next-bridge,
> panel and the legacy display-timings DT node on their own.
>
> Drop unused ddc-i2c-bus and edid handling (none of the DT files merged
> upstream ever used these features), switch to panel-bridge driver,
> removing the need to handle drm_panel codepaths separately and finally
> switch to drm_bridge_connector, removing requirement for the downstream
> bridges to create drm_connector on their own.
>
> This has been tested on the iMX53 with the DPI panel attached to LDB via
> LVDS decoder, using all possible usecases (lvds-codec + panel, panel
> linked directly to LDB node and the display-timings node).
>
> To be able to test on the iMX53 QSRB with the HDMI cape apply [1], [2]
>
> [1] https://lore.kernel.org/all/20240514030718.533169-1-victor.liu@nxp.com/
> [2] https://lore.kernel.org/all/20240602-imx-sii902x-defconfig-v1-1-71a6c382b422@linaro.org/
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---
> Changes in v3:
> - Notice (soft) dependencies in the cover letter (Chris)
> - Select DRM_BRIDGE instead of depending on it (Philipp)
> - Dropped unused selection of DRM_PANEL (Philipp)
> - Added missing include of <drm/bridge/imx.h> to parallel-display.c
>   (Philipp)
> - Link to v2: https://lore.kernel.org/r/20240331-drm-imx-cleanup-v2-0-d81c1d1c1026@linaro.org
>
> Changes in v2:
> - Fixed drm_bridge_attach flags in imx/parallel-display driver.
> - Moved the legacy bridge to drivers/gpu/drm/bridge
> - Added missing EXPORT_SYMBOL_GPL to the iMX legacy bridge
> - Link to v1: https://lore.kernel.org/r/20240311-drm-imx-cleanup-v1-0-e104f05caa51@linaro.org
>
> ---
> Dmitry Baryshkov (12):
>       dt-bindings: display: fsl-imx-drm: drop edid property support
>       dt-bindings: display: imx/ldb: drop ddc-i2c-bus property
>       drm/imx: cleanup the imx-drm header
>       drm/imx: parallel-display: drop edid override support
>       drm/imx: ldb: drop custom EDID support
>       drm/imx: ldb: drop custom DDC bus support
>       drm/imx: ldb: switch to drm_panel_bridge
>       drm/imx: parallel-display: switch to drm_panel_bridge
>       drm/imx: add internal bridge handling display-timings DT node
>       drm/imx: ldb: switch to imx_legacy_bridge / drm_bridge_connector
>       drm/imx: parallel-display: switch to imx_legacy_bridge / drm_bridge_connector
>       drm/imx: move imx_drm_connector_destroy to imx-tve
>
>  .../bindings/display/imx/fsl-imx-drm.txt           |   2 -
>  .../devicetree/bindings/display/imx/ldb.txt        |   1 -
>  drivers/gpu/drm/bridge/imx/Kconfig                 |  10 +
>  drivers/gpu/drm/bridge/imx/Makefile                |   1 +
>  drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c     |  85 +++++++++
>  drivers/gpu/drm/imx/ipuv3/Kconfig                  |  10 +-
>  drivers/gpu/drm/imx/ipuv3/imx-drm-core.c           |   7 -
>  drivers/gpu/drm/imx/ipuv3/imx-drm.h                |  14 --
>  drivers/gpu/drm/imx/ipuv3/imx-ldb.c                | 203 +++++----------------
>  drivers/gpu/drm/imx/ipuv3/imx-tve.c                |   8 +-
>  drivers/gpu/drm/imx/ipuv3/parallel-display.c       | 139 +++-----------
>  include/drm/bridge/imx.h                           |  13 ++
>  12 files changed, 187 insertions(+), 306 deletions(-)
> ---
> base-commit: 850ca533e572247b6f71dafcbf7feb0359350963
> change-id: 20240310-drm-imx-cleanup-10746a9b71f5
>
> Best regards,
> --
> Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
>