| Message ID | 20240503151129.3901815-4-l.stach@pengutronix.de (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | improve Analogix DP AUX channel handling | expand |
On Fri, May 3, 2024 at 5:12 PM Lucas Stach <l.stach@pengutronix.de> wrote: > > AUX transactions require the controller to be in working state and > take a runtime PM reference. To avoid potential races beween the > first transactions on the bus and runtime PM being set up, move the > AUX registration behind the runtime PM setup. > > Signed-off-by: Lucas Stach <l.stach@pengutronix.de> > --- > .../drm/bridge/analogix/analogix_dp_core.c | 19 +++++++++++-------- > 1 file changed, 11 insertions(+), 8 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c > index b39721588980..0af2a70ae5bf 100644 > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c > @@ -1728,31 +1728,34 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev) > dp->drm_dev = drm_dev; > dp->encoder = dp->plat_data->encoder; > > + pm_runtime_use_autosuspend(dp->dev); > + pm_runtime_set_autosuspend_delay(dp->dev, 100); > + pm_runtime_enable(dp->dev); > + > dp->aux.name = "DP-AUX"; > dp->aux.transfer = analogix_dpaux_transfer; > dp->aux.dev = dp->dev; > dp->aux.drm_dev = drm_dev; > > ret = drm_dp_aux_register(&dp->aux); > - if (ret) > - return ret; > - > - pm_runtime_use_autosuspend(dp->dev); > - pm_runtime_set_autosuspend_delay(dp->dev, 100); > - pm_runtime_enable(dp->dev); > + if (ret) { > + DRM_ERROR("failed to register AUX (%d)\n", ret); > + goto err_disable_pm_runtime; > + } > > ret = analogix_dp_create_bridge(drm_dev, dp); > if (ret) { > DRM_ERROR("failed to create bridge (%d)\n", ret); > - goto err_disable_pm_runtime; > + goto err_unregister_aux; > } > > return 0; > > +err_unregister_aux: > + drm_dp_aux_unregister(&dp->aux); > err_disable_pm_runtime: > pm_runtime_dont_use_autosuspend(dp->dev); > pm_runtime_disable(dp->dev); > - drm_dp_aux_unregister(&dp->aux); > > return ret; > } > -- > 2.39.2 > Reviewed-by: Robert Foss <rfoss@kernel.org>
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index b39721588980..0af2a70ae5bf 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -1728,31 +1728,34 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev) dp->drm_dev = drm_dev; dp->encoder = dp->plat_data->encoder; + pm_runtime_use_autosuspend(dp->dev); + pm_runtime_set_autosuspend_delay(dp->dev, 100); + pm_runtime_enable(dp->dev); + dp->aux.name = "DP-AUX"; dp->aux.transfer = analogix_dpaux_transfer; dp->aux.dev = dp->dev; dp->aux.drm_dev = drm_dev; ret = drm_dp_aux_register(&dp->aux); - if (ret) - return ret; - - pm_runtime_use_autosuspend(dp->dev); - pm_runtime_set_autosuspend_delay(dp->dev, 100); - pm_runtime_enable(dp->dev); + if (ret) { + DRM_ERROR("failed to register AUX (%d)\n", ret); + goto err_disable_pm_runtime; + } ret = analogix_dp_create_bridge(drm_dev, dp); if (ret) { DRM_ERROR("failed to create bridge (%d)\n", ret); - goto err_disable_pm_runtime; + goto err_unregister_aux; } return 0; +err_unregister_aux: + drm_dp_aux_unregister(&dp->aux); err_disable_pm_runtime: pm_runtime_dont_use_autosuspend(dp->dev); pm_runtime_disable(dp->dev); - drm_dp_aux_unregister(&dp->aux); return ret; }
AUX transactions require the controller to be in working state and take a runtime PM reference. To avoid potential races beween the first transactions on the bus and runtime PM being set up, move the AUX registration behind the runtime PM setup. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> --- .../drm/bridge/analogix/analogix_dp_core.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)