| Message ID | 1650551811-24319-2-git-send-email-quic_sbillaka@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for the eDP panel over aux_bus | expand |
Hi, On Thu, Apr 21, 2022 at 7:37 AM Sankeerth Billakanti <quic_sbillaka@quicinc.com> wrote: > > @@ -1530,6 +1532,61 @@ 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; > + 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) { > + dp_display_host_init(dp_priv); > + dp_catalog_ctrl_hpd_config(dp_priv->catalog); > + dp_display_host_phy_init(dp_priv); > + enable_irq(dp_priv->irq); > + > + rc = devm_of_dp_aux_populate_ep_devices(dp_priv->aux); I think a comment was requested above that line saying something like: /* * 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. */ > + of_node_put(aux_bus); > + if (rc) > + goto edp_error; > + } else if (dp->is_edp) { > + DRM_ERROR("eDP aux_bus not found\n"); > + rc = -ENODEV; > + goto error; This goto doesn't add much. Just leave the above like it was in v7. return -ENODEV w/ no goto. > + } > + > + /* > + * External bridges are mandatory for eDP interfaces: one has to > + * provide at least an eDP panel (which gets wrapped into panel-bridge). > + * > + * For DisplayPort interfaces external bridges are optional, so > + * silently ignore an error if one is not present (-ENODEV). > + */ > + rc = dp_parser_find_next_bridge(dp_priv->parser); > + if (rc && dp->is_edp) { > + DRM_ERROR("eDP: cannot find the next bridge, rc = %d\n", rc); > + goto edp_error; > + } else if (rc && rc != -ENODEV) { > + DRM_ERROR("DP: cannot find the next bridge, rc = %d\n", rc); > + goto error; > + } The above wouldn't be my favorite way of doing this. Instead, I would have written: if (rc) { DRM_ERROR("Cannot find the next bridge, rc = %d\n", rc); goto err; } ... err: if (dp->is_edp) { disable_irq(...); dp_display_host_phy_exit(...); dp_display_host_deinit(...); } return rc; > + > + dp->next_bridge = dp_priv->parser->next_bridge; > + > + return 0; > + > +edp_error: > + disable_irq(dp_priv->irq); > + dp_display_host_phy_exit(dp_priv); > + dp_display_host_deinit(dp_priv); > +error: > + return rc; > +} > + > int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev, > struct drm_encoder *encoder) > { With the above fixes, I'd be happy enough for my Reviewed-by tag with the expectation that continued work will happen to continue cleaning this up. -Doug
Hi Doug, >On Thu, Apr 21, 2022 at 7:37 AM Sankeerth Billakanti ><quic_sbillaka@quicinc.com> wrote: >> >> @@ -1530,6 +1532,61 @@ 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; >> + 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) { >> + dp_display_host_init(dp_priv); >> + dp_catalog_ctrl_hpd_config(dp_priv->catalog); >> + dp_display_host_phy_init(dp_priv); >> + enable_irq(dp_priv->irq); >> + >> + rc = devm_of_dp_aux_populate_ep_devices(dp_priv->aux); > >I think a comment was requested above that line saying something like: > >/* > * 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. > */ > > Will add the comment >> + of_node_put(aux_bus); >> + if (rc) >> + goto edp_error; >> + } else if (dp->is_edp) { >> + DRM_ERROR("eDP aux_bus not found\n"); >> + rc = -ENODEV; >> + goto error; > >This goto doesn't add much. Just leave the above like it was in v7. >return -ENODEV w/ no goto. > > Okay >> + } >> + >> + /* >> + * External bridges are mandatory for eDP interfaces: one has to >> + * provide at least an eDP panel (which gets wrapped into panel- >bridge). >> + * >> + * For DisplayPort interfaces external bridges are optional, so >> + * silently ignore an error if one is not present (-ENODEV). >> + */ >> + rc = dp_parser_find_next_bridge(dp_priv->parser); >> + if (rc && dp->is_edp) { >> + DRM_ERROR("eDP: cannot find the next bridge, rc = %d\n", rc); >> + goto edp_error; >> + } else if (rc && rc != -ENODEV) { >> + DRM_ERROR("DP: cannot find the next bridge, rc = %d\n", rc); >> + goto error; >> + } > >The above wouldn't be my favorite way of doing this. Instead, I would have >written: > > if (rc) { > DRM_ERROR("Cannot find the next bridge, rc = %d\n", rc); > goto err; > } > ... > >err: > if (dp->is_edp) { > disable_irq(...); > dp_display_host_phy_exit(...); > dp_display_host_deinit(...); > } > return rc; > If rc is ENODEV for DP, then we need to return 0. Shall I add like below ? err: if (dp->is_edp) { disable_irq(...); dp_display_host_phy_exit(...); dp_display_host_deinit(...); } else If (rc == -ENODEV) rc = 0; return rc; >> + >> + dp->next_bridge = dp_priv->parser->next_bridge; >> + >> + return 0; >> + >> +edp_error: >> + disable_irq(dp_priv->irq); >> + dp_display_host_phy_exit(dp_priv); >> + dp_display_host_deinit(dp_priv); >> +error: >> + return rc; >> +} >> + >> int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device >*dev, >> struct drm_encoder *encoder) { > >With the above fixes, I'd be happy enough for my Reviewed-by tag with the >expectation that continued work will happen to continue cleaning this up. > > >-Doug
Hi, On Thu, Apr 21, 2022 at 9:00 AM Sankeerth Billakanti (QUIC) <quic_sbillaka@quicinc.com> wrote: > > >> + } > >> + > >> + /* > >> + * External bridges are mandatory for eDP interfaces: one has to > >> + * provide at least an eDP panel (which gets wrapped into panel- > >bridge). > >> + * > >> + * For DisplayPort interfaces external bridges are optional, so > >> + * silently ignore an error if one is not present (-ENODEV). > >> + */ > >> + rc = dp_parser_find_next_bridge(dp_priv->parser); > >> + if (rc && dp->is_edp) { > >> + DRM_ERROR("eDP: cannot find the next bridge, rc = %d\n", rc); > >> + goto edp_error; > >> + } else if (rc && rc != -ENODEV) { > >> + DRM_ERROR("DP: cannot find the next bridge, rc = %d\n", rc); > >> + goto error; > >> + } > > > >The above wouldn't be my favorite way of doing this. Instead, I would have > >written: > > > > if (rc) { > > DRM_ERROR("Cannot find the next bridge, rc = %d\n", rc); > > goto err; > > } > > ... > > > >err: > > if (dp->is_edp) { > > disable_irq(...); > > dp_display_host_phy_exit(...); > > dp_display_host_deinit(...); > > } > > return rc; > > > > If rc is ENODEV for DP, then we need to return 0. Shall I add like below ? > > err: > if (dp->is_edp) { > disable_irq(...); > dp_display_host_phy_exit(...); > dp_display_host_deinit(...); > } else > If (rc == -ENODEV) > rc = 0; > return rc; I wouldn't. Then you're essentially going to "err" for a case that you don't consider an error. I would instead have just handled it right away. rc = dp_parser_find_next_bridge(dp_priv->parser); if (!dp->is_edp && rc == -ENODEV) return 0; This also is better IMO because it means you aren't assuming that `dp_priv->parser->next_bridge` is "valid" (or at least NULL) after dp_parser_find_next_bridge() returned an error. -Doug
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index d7a19d6..3d03c77 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -10,6 +10,7 @@ #include <linux/component.h> #include <linux/of_irq.h> #include <linux/delay.h> +#include <drm/dp/drm_dp_aux_bus.h> #include "msm_drv.h" #include "msm_kms.h" @@ -259,14 +260,12 @@ static int dp_display_bind(struct device *dev, struct device *master, dp->dp_display.drm_dev = drm; priv->dp[dp->id] = &dp->dp_display; - rc = dp->parser->parse(dp->parser, dp->dp_display.connector_type); + rc = dp->parser->parse(dp->parser); if (rc) { DRM_ERROR("device tree parsing failed\n"); goto end; } - dp->dp_display.next_bridge = dp->parser->next_bridge; - dp->aux->drm_dev = drm; rc = dp_aux_register(dp->aux); if (rc) { @@ -1319,6 +1318,8 @@ static int dp_display_probe(struct platform_device *pdev) dp->pdev = pdev; dp->name = "drm_dp"; dp->dp_display.connector_type = desc->connector_type; + dp->dp_display.is_edp = + (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP); rc = dp_init_sub_modules(dp); if (rc) { @@ -1508,7 +1509,8 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display) dp_hpd_event_setup(dp); - dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100); + if (!dp_display->is_edp) + dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100); } void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor) @@ -1530,6 +1532,61 @@ 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; + 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) { + dp_display_host_init(dp_priv); + dp_catalog_ctrl_hpd_config(dp_priv->catalog); + dp_display_host_phy_init(dp_priv); + enable_irq(dp_priv->irq); + + rc = devm_of_dp_aux_populate_ep_devices(dp_priv->aux); + of_node_put(aux_bus); + if (rc) + goto edp_error; + } else if (dp->is_edp) { + DRM_ERROR("eDP aux_bus not found\n"); + rc = -ENODEV; + goto error; + } + + /* + * External bridges are mandatory for eDP interfaces: one has to + * provide at least an eDP panel (which gets wrapped into panel-bridge). + * + * For DisplayPort interfaces external bridges are optional, so + * silently ignore an error if one is not present (-ENODEV). + */ + rc = dp_parser_find_next_bridge(dp_priv->parser); + if (rc && dp->is_edp) { + DRM_ERROR("eDP: cannot find the next bridge, rc = %d\n", rc); + goto edp_error; + } else if (rc && rc != -ENODEV) { + DRM_ERROR("DP: cannot find the next bridge, rc = %d\n", rc); + goto error; + } + + dp->next_bridge = dp_priv->parser->next_bridge; + + return 0; + +edp_error: + disable_irq(dp_priv->irq); + dp_display_host_phy_exit(dp_priv); + dp_display_host_deinit(dp_priv); +error: + return rc; +} + int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev, struct drm_encoder *encoder) { @@ -1553,6 +1610,10 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev, dp_display->encoder = encoder; + ret = dp_display_get_next_bridge(dp_display); + if (ret) + return ret; + dp_display->bridge = dp_bridge_init(dp_display, dev, encoder); if (IS_ERR(dp_display->bridge)) { ret = PTR_ERR(dp_display->bridge); diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h index 49a1d89..1377cc3 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.h +++ b/drivers/gpu/drm/msm/dp/dp_display.h @@ -21,6 +21,7 @@ struct msm_dp { bool audio_enabled; bool power_on; unsigned int connector_type; + bool is_edp; hdmi_codec_plugged_cb plugged_cb; diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c index 7ce1aca..8a75c55 100644 --- a/drivers/gpu/drm/msm/dp/dp_drm.c +++ b/drivers/gpu/drm/msm/dp/dp_drm.c @@ -114,10 +114,23 @@ struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device * bridge->funcs = &dp_bridge_ops; bridge->type = dp_display->connector_type; - bridge->ops = - DRM_BRIDGE_OP_DETECT | - DRM_BRIDGE_OP_HPD | - DRM_BRIDGE_OP_MODES; + /* + * Many ops only make sense for DP. Why? + * - Detect/HPD are used by DRM to know if a display is _physically_ + * there, not whether the display is powered on / finished initting. + * On eDP we assume the display is always there because you can't + * know until power is applied. If we don't implement the ops DRM will + * assume our display is always there. + * - Currently eDP mode reading is driven by the panel driver. This + * allows the panel driver to properly power itself on to read the + * modes. + */ + if (!dp_display->is_edp) { + bridge->ops = + DRM_BRIDGE_OP_DETECT | + DRM_BRIDGE_OP_HPD | + DRM_BRIDGE_OP_MODES; + } rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR); if (rc) { diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c index 1056b8d..4bdbf91 100644 --- a/drivers/gpu/drm/msm/dp/dp_parser.c +++ b/drivers/gpu/drm/msm/dp/dp_parser.c @@ -265,7 +265,7 @@ static int dp_parser_clock(struct dp_parser *parser) return 0; } -static int dp_parser_find_next_bridge(struct dp_parser *parser) +int dp_parser_find_next_bridge(struct dp_parser *parser) { struct device *dev = &parser->pdev->dev; struct drm_bridge *bridge; @@ -279,7 +279,7 @@ static int dp_parser_find_next_bridge(struct dp_parser *parser) return 0; } -static int dp_parser_parse(struct dp_parser *parser, int connector_type) +static int dp_parser_parse(struct dp_parser *parser) { int rc = 0; @@ -300,25 +300,6 @@ static int dp_parser_parse(struct dp_parser *parser, int connector_type) if (rc) return rc; - /* - * External bridges are mandatory for eDP interfaces: one has to - * provide at least an eDP panel (which gets wrapped into panel-bridge). - * - * For DisplayPort interfaces external bridges are optional, so - * silently ignore an error if one is not present (-ENODEV). - */ - rc = dp_parser_find_next_bridge(parser); - if (rc == -ENODEV) { - if (connector_type == DRM_MODE_CONNECTOR_eDP) { - DRM_ERROR("eDP: next bridge is not present\n"); - return rc; - } - } else if (rc) { - if (rc != -EPROBE_DEFER) - DRM_ERROR("DP: error parsing next bridge: %d\n", rc); - return rc; - } - /* Map the corresponding regulator information according to * version. Currently, since we only have one supported platform, * mapping the regulator directly. diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h b/drivers/gpu/drm/msm/dp/dp_parser.h index d371bae..950416c 100644 --- a/drivers/gpu/drm/msm/dp/dp_parser.h +++ b/drivers/gpu/drm/msm/dp/dp_parser.h @@ -125,7 +125,7 @@ struct dp_parser { u32 max_dp_lanes; struct drm_bridge *next_bridge; - int (*parse)(struct dp_parser *parser, int connector_type); + int (*parse)(struct dp_parser *parser); }; /** @@ -141,4 +141,15 @@ struct dp_parser { */ struct dp_parser *dp_parser_get(struct platform_device *pdev); +/** + * dp_parser_find_next_bridge() - find an additional bridge to DP + * + * @parser: dp_parser data from client + * return: 0 if able to get the bridge else return an error code + * + * This function is used to find any additional bridge attached to + * the DP controller. The eDP interface requires a panel bridge. + */ +int dp_parser_find_next_bridge(struct dp_parser *parser); + #endif
This patch adds support for generic eDP sink through aux_bus. The eDP/DP controller driver should support aux transactions originating from the panel-edp driver and hence should be initialized and ready. The panel bridge supporting the panel should be ready before the bridge connector is initialized. The generic panel probe needs the controller resources to be enabled to support the aux transactions originating from the panel probe. Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com> --- Changes in v8: - handle corner cases - add comment for the bridge ops Changes in v7: - aux_bus is mandatory for eDP - connector type check modified to just check for eDP Changes in v6: - Remove initialization - Fix aux_bus node leak - Split the patches drivers/gpu/drm/msm/dp/dp_display.c | 69 ++++++++++++++++++++++++++++++++++--- drivers/gpu/drm/msm/dp/dp_display.h | 1 + drivers/gpu/drm/msm/dp/dp_drm.c | 21 ++++++++--- drivers/gpu/drm/msm/dp/dp_parser.c | 23 ++----------- drivers/gpu/drm/msm/dp/dp_parser.h | 13 ++++++- 5 files changed, 97 insertions(+), 30 deletions(-)