Re: [PATCH 1/3] drm/mediatek: mtk_dp: Fix hdmi codec and phy driver unregistration

On Wed, Sep 24, 2025 at 12:37:06PM +0200, AngeloGioacchino Del Regno wrote:

During probe, this driver is registering two platform devices: one
for the HDMI Codec driver and one for the DisplayPort PHY driver.

In the probe function, none of the error cases are unregistering
any of the two platform devices and this may cause registration
of multiple instances of those in case this driver returns one or
more probe deferral(s) in the "wrong" spots.

In order to fix this, add devm actions to unregister those and
remove the manual calls to platform_device_unregister in the
mtk_dp_remove() function, as those would otherwise be redundant.

Fixes: e71a8ebbe086 ("drm/mediatek: dp: Audio support for MT8195")
Fixes: caf2ae486742 ("drm/mediatek: dp: Add support for embedded DisplayPort aux-bus")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

You can save yourself from all these troubles if you store the
registered device at  connector->hdmi_audio.codec_pdev (see
drm_connector_cleanup()).

And of course, you might use DRM_BRIDGE_OP_DP_AUDIO in order to reduce
code duplication.

-- 
With best wishes
Dmitry