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drm: zynqmp_kms: Fix AUX bus not getting unregistered

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drm_encoder_cleanup is responsible for calling drm_bridge_detach for
each bridge attached to the encoder. zynqmp_dp_bridge_detach is in turn
responsible for unregistering the AUX bus. However, we never ended up
calling drm_encoder_cleanup in the remove or error paths, so the AUX bus
would stick around after the rest of the driver had been removed.

I don't really understand why drm_mode_config_cleanup doesn't call
drm_encoder_cleanup for us. It will call destroy (which for
simple_encoder is drm_encoder_cleanup) on encoders in the mode_config's
encoder_list.

Should drm_encoder_cleanup get called before or after
drm_atomic_helper_shutdown?

Fixes: 2dfd045c8435 ("drm: xlnx: zynqmp_dpsub: Register AUX bus at bridge attach time")
Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503192922.2172314-2-sean.anderson@linux.dev
This commit is contained in:
Sean Anderson 2024-05-03 15:29:13 -04:00 committed by Tomi Valkeinen
parent fea7fad851
commit 0743dafefd
1 changed files with 9 additions and 3 deletions
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12
drivers/gpu/drm/xlnx/zynqmp_kms.c
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@ -437,23 +437,28 @@ static int zynqmp_dpsub_kms_init(struct zynqmp_dpsub *dpsub)
DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (ret) {
dev_err(dpsub->dev, "failed to attach bridge to encoder\n");
return ret;
goto err_encoder;
}
/* Create the connector for the chain of bridges. */
connector = drm_bridge_connector_init(&dpsub->drm->dev, encoder);
if (IS_ERR(connector)) {
dev_err(dpsub->dev, "failed to created connector\n");
return PTR_ERR(connector);
ret = PTR_ERR(connector);
goto err_encoder;
}
ret = drm_connector_attach_encoder(connector, encoder);
if (ret < 0) {
dev_err(dpsub->dev, "failed to attach connector to encoder\n");
return ret;
goto err_encoder;
}
return 0;
err_encoder:
drm_encoder_cleanup(encoder);
return ret;
}
static void zynqmp_dpsub_drm_release(struct drm_device *drm, void *res)
@ -533,5 +538,6 @@ void zynqmp_dpsub_drm_cleanup(struct zynqmp_dpsub *dpsub)
drm_dev_unregister(drm);
drm_atomic_helper_shutdown(drm);
drm_encoder_cleanup(&dpsub->drm->encoder);
drm_kms_helper_poll_fini(drm);
}