| Message ID | 1694813901-26952-8-git-send-email-quic_khsieh@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | incorporate pm runtime framework and eDP clean up | expand |
On Sat, 16 Sept 2023 at 00:39, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote: > > Currently eDP population is done at msm_dp_modeset_init() which happen > at binding time. Move eDP population to be done at display probe time > so that probe deferral cases can be handled effectively. > wait_for_hpd_asserted callback is added during drm_dp_aux_init() > to ensure eDP's HPD is up before proceeding eDP population. > > Changes in v3: > -- add done_probing callback into devm_of_dp_aux_populate_bus() > > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > --- > drivers/gpu/drm/msm/dp/dp_aux.c | 25 ++++++++++++ > drivers/gpu/drm/msm/dp/dp_display.c | 79 ++++++++++++++++++------------------- > 2 files changed, 64 insertions(+), 40 deletions(-) > > diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c > index 8fa93c5..79f0c6e 100644 > --- a/drivers/gpu/drm/msm/dp/dp_aux.c > +++ b/drivers/gpu/drm/msm/dp/dp_aux.c > @@ -507,6 +507,21 @@ void dp_aux_unregister(struct drm_dp_aux *dp_aux) > drm_dp_aux_unregister(dp_aux); > } > > +static int dp_wait_hpd_asserted(struct drm_dp_aux *dp_aux, > + unsigned long wait_us) > +{ > + int ret; > + struct dp_aux_private *aux; > + > + aux = container_of(dp_aux, struct dp_aux_private, dp_aux); > + > + pm_runtime_get_sync(aux->dev); > + ret = dp_catalog_aux_wait_for_hpd_connect_state(aux->catalog); > + pm_runtime_put_sync(aux->dev); > + > + return ret; > +} > + > struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog, > bool is_edp) > { > @@ -530,6 +545,16 @@ struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog, > aux->catalog = catalog; > aux->retry_cnt = 0; > > + /* > + * Use the drm_dp_aux_init() to use the aux adapter > + * before registering aux with the DRM device. > + */ Usual comment: this describes what, but should be documenting why. > + aux->dp_aux.name = "dpu_dp_aux"; > + aux->dp_aux.dev = dev; > + aux->dp_aux.transfer = dp_aux_transfer; > + aux->dp_aux.wait_hpd_asserted = dp_wait_hpd_asserted; Then the relevant code should be removed before a call to drm_dp_aux_register(). > + drm_dp_aux_init(&aux->dp_aux); > + > return &aux->dp_aux; > } > > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c > index b58cb02..886fae5 100644 > --- a/drivers/gpu/drm/msm/dp/dp_display.c > +++ b/drivers/gpu/drm/msm/dp/dp_display.c > @@ -310,8 +310,6 @@ static void dp_display_unbind(struct device *dev, struct device *master, > > kthread_stop(dp->ev_tsk); > > - of_dp_aux_depopulate_bus(dp->aux); > - > dp_power_client_deinit(dp->power); > dp_unregister_audio_driver(dev, dp->audio); > dp_aux_unregister(dp->aux); > @@ -1217,6 +1215,31 @@ static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pde > return NULL; > } > > +static int dp_auxbus_done_probe(struct drm_dp_aux *aux) > +{ > + int rc; > + > + rc = component_add(aux->dev, &dp_display_comp_ops); > + if (rc) > + DRM_ERROR("eDP component add failed, rc=%d\n", rc); > + > + return rc; > +} > + > +static int dp_display_auxbus_population(struct dp_display_private *dp) > +{ > + struct device *dev = &dp->pdev->dev; > + struct device_node *aux_bus; > + int ret = 0; > + > + aux_bus = of_get_child_by_name(dev->of_node, "aux-bus"); device_node refcount leak. But I think that the aux-bus existence check is incorrect here. of_dp_aux_populate_bus() will check and return -ENODEV if there is no aux-bus subnode. And once you have dropped the aux_bus check, you can safely inline this function. > + > + if (aux_bus) > + ret = devm_of_dp_aux_populate_bus(dp->aux, dp_auxbus_done_probe); > + > + return ret; > +} > + > static int dp_display_probe(struct platform_device *pdev) > { > int rc = 0; > @@ -1282,10 +1305,16 @@ static int dp_display_probe(struct platform_device *pdev) > if (rc) > return rc; > > - rc = component_add(&pdev->dev, &dp_display_comp_ops); > - if (rc) { > - DRM_ERROR("component add failed, rc=%d\n", rc); > - dp_display_deinit_sub_modules(dp); > + if (dp->dp_display.is_edp) { > + rc = dp_display_auxbus_population(dp); > + if (rc) > + DRM_ERROR("eDP auxbus population failed, rc=%d\n", rc); > + } else { > + rc = component_add(&pdev->dev, &dp_display_comp_ops); > + if (rc) { > + DRM_ERROR("component add failed, rc=%d\n", rc); > + dp_display_deinit_sub_modules(dp); > + } > } > > return rc; > @@ -1296,14 +1325,13 @@ static int dp_display_remove(struct platform_device *pdev) > struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev); > > component_del(&pdev->dev, &dp_display_comp_ops); > - dp_display_deinit_sub_modules(dp); > - > platform_set_drvdata(pdev, NULL); > > - pm_runtime_put_sync_suspend(&pdev->dev); > pm_runtime_dont_use_autosuspend(&pdev->dev); > pm_runtime_disable(&pdev->dev); > > + dp_display_deinit_sub_modules(dp); These changes should be reasoned. > + > return 0; > } > > @@ -1432,31 +1460,10 @@ void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor) > > static int dp_display_get_next_bridge(struct msm_dp *dp) > { > - int rc; > + int rc = 0; Is there a need to set it to 0? > struct dp_display_private *dp_priv; > - struct device_node *aux_bus; > - struct device *dev; > > dp_priv = container_of(dp, struct dp_display_private, dp_display); > - dev = &dp_priv->pdev->dev; > - aux_bus = of_get_child_by_name(dev->of_node, "aux-bus"); > - > - if (aux_bus && dp->is_edp) { > - /* > - * The code below assumes that the panel will finish probing > - * by the time devm_of_dp_aux_populate_ep_devices() returns. > - * This isn't a great assumption since it will fail if the > - * panel driver is probed asynchronously but is the best we > - * can do without a bigger driver reorganization. > - */ > - rc = of_dp_aux_populate_bus(dp_priv->aux, NULL); > - of_node_put(aux_bus); > - if (rc) > - goto error; > - } else if (dp->is_edp) { > - DRM_ERROR("eDP aux_bus not found\n"); > - return -ENODEV; > - } > > /* > * External bridges are mandatory for eDP interfaces: one has to > @@ -1469,17 +1476,9 @@ static int dp_display_get_next_bridge(struct msm_dp *dp) > if (!dp->is_edp && rc == -ENODEV) > return 0; > > - if (!rc) { > + if (!rc) > dp->next_bridge = dp_priv->parser->next_bridge; > - return 0; > - } > > -error: > - if (dp->is_edp) { > - of_dp_aux_depopulate_bus(dp_priv->aux); > - dp_display_host_phy_exit(dp_priv); > - dp_display_host_deinit(dp_priv); > - } > return rc; > } > > -- > 2.7.4 > -- With best wishes Dmitry
diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c index 8fa93c5..79f0c6e 100644 --- a/drivers/gpu/drm/msm/dp/dp_aux.c +++ b/drivers/gpu/drm/msm/dp/dp_aux.c @@ -507,6 +507,21 @@ void dp_aux_unregister(struct drm_dp_aux *dp_aux) drm_dp_aux_unregister(dp_aux); } +static int dp_wait_hpd_asserted(struct drm_dp_aux *dp_aux, + unsigned long wait_us) +{ + int ret; + struct dp_aux_private *aux; + + aux = container_of(dp_aux, struct dp_aux_private, dp_aux); + + pm_runtime_get_sync(aux->dev); + ret = dp_catalog_aux_wait_for_hpd_connect_state(aux->catalog); + pm_runtime_put_sync(aux->dev); + + return ret; +} + struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog, bool is_edp) { @@ -530,6 +545,16 @@ struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog, aux->catalog = catalog; aux->retry_cnt = 0; + /* + * Use the drm_dp_aux_init() to use the aux adapter + * before registering aux with the DRM device. + */ + aux->dp_aux.name = "dpu_dp_aux"; + aux->dp_aux.dev = dev; + aux->dp_aux.transfer = dp_aux_transfer; + aux->dp_aux.wait_hpd_asserted = dp_wait_hpd_asserted; + drm_dp_aux_init(&aux->dp_aux); + return &aux->dp_aux; } diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index b58cb02..886fae5 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -310,8 +310,6 @@ static void dp_display_unbind(struct device *dev, struct device *master, kthread_stop(dp->ev_tsk); - of_dp_aux_depopulate_bus(dp->aux); - dp_power_client_deinit(dp->power); dp_unregister_audio_driver(dev, dp->audio); dp_aux_unregister(dp->aux); @@ -1217,6 +1215,31 @@ static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pde return NULL; } +static int dp_auxbus_done_probe(struct drm_dp_aux *aux) +{ + int rc; + + rc = component_add(aux->dev, &dp_display_comp_ops); + if (rc) + DRM_ERROR("eDP component add failed, rc=%d\n", rc); + + return rc; +} + +static int dp_display_auxbus_population(struct dp_display_private *dp) +{ + struct device *dev = &dp->pdev->dev; + struct device_node *aux_bus; + int ret = 0; + + aux_bus = of_get_child_by_name(dev->of_node, "aux-bus"); + + if (aux_bus) + ret = devm_of_dp_aux_populate_bus(dp->aux, dp_auxbus_done_probe); + + return ret; +} + static int dp_display_probe(struct platform_device *pdev) { int rc = 0; @@ -1282,10 +1305,16 @@ static int dp_display_probe(struct platform_device *pdev) if (rc) return rc; - rc = component_add(&pdev->dev, &dp_display_comp_ops); - if (rc) { - DRM_ERROR("component add failed, rc=%d\n", rc); - dp_display_deinit_sub_modules(dp); + if (dp->dp_display.is_edp) { + rc = dp_display_auxbus_population(dp); + if (rc) + DRM_ERROR("eDP auxbus population failed, rc=%d\n", rc); + } else { + rc = component_add(&pdev->dev, &dp_display_comp_ops); + if (rc) { + DRM_ERROR("component add failed, rc=%d\n", rc); + dp_display_deinit_sub_modules(dp); + } } return rc; @@ -1296,14 +1325,13 @@ static int dp_display_remove(struct platform_device *pdev) struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev); component_del(&pdev->dev, &dp_display_comp_ops); - dp_display_deinit_sub_modules(dp); - platform_set_drvdata(pdev, NULL); - pm_runtime_put_sync_suspend(&pdev->dev); pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_disable(&pdev->dev); + dp_display_deinit_sub_modules(dp); + return 0; } @@ -1432,31 +1460,10 @@ void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor) static int dp_display_get_next_bridge(struct msm_dp *dp) { - int rc; + int rc = 0; struct dp_display_private *dp_priv; - struct device_node *aux_bus; - struct device *dev; dp_priv = container_of(dp, struct dp_display_private, dp_display); - dev = &dp_priv->pdev->dev; - aux_bus = of_get_child_by_name(dev->of_node, "aux-bus"); - - if (aux_bus && dp->is_edp) { - /* - * The code below assumes that the panel will finish probing - * by the time devm_of_dp_aux_populate_ep_devices() returns. - * This isn't a great assumption since it will fail if the - * panel driver is probed asynchronously but is the best we - * can do without a bigger driver reorganization. - */ - rc = of_dp_aux_populate_bus(dp_priv->aux, NULL); - of_node_put(aux_bus); - if (rc) - goto error; - } else if (dp->is_edp) { - DRM_ERROR("eDP aux_bus not found\n"); - return -ENODEV; - } /* * External bridges are mandatory for eDP interfaces: one has to @@ -1469,17 +1476,9 @@ static int dp_display_get_next_bridge(struct msm_dp *dp) if (!dp->is_edp && rc == -ENODEV) return 0; - if (!rc) { + if (!rc) dp->next_bridge = dp_priv->parser->next_bridge; - return 0; - } -error: - if (dp->is_edp) { - of_dp_aux_depopulate_bus(dp_priv->aux); - dp_display_host_phy_exit(dp_priv); - dp_display_host_deinit(dp_priv); - } return rc; }
Currently eDP population is done at msm_dp_modeset_init() which happen at binding time. Move eDP population to be done at display probe time so that probe deferral cases can be handled effectively. wait_for_hpd_asserted callback is added during drm_dp_aux_init() to ensure eDP's HPD is up before proceeding eDP population. Changes in v3: -- add done_probing callback into devm_of_dp_aux_populate_bus() Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> --- drivers/gpu/drm/msm/dp/dp_aux.c | 25 ++++++++++++ drivers/gpu/drm/msm/dp/dp_display.c | 79 ++++++++++++++++++------------------- 2 files changed, 64 insertions(+), 40 deletions(-)