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drm/msm/dp: Implement hpd_notify()
The DisplayPort controller's hot-plug mechanism is based on pinmuxing a physical signal on a GPIO pin into the controller. This is not always possible, either because there aren't dedicated GPIOs available or because the hot-plug signal is a virtual notification, in cases such as USB Type-C. For these cases, by implementing the hpd_notify() callback for the DisplayPort controller's drm_bridge, a downstream drm_bridge (next_bridge) can be used to track and signal the connection status changes. This makes it possible to use downstream drm_bridges such as display-connector or any virtual mechanism, as long as they are implemented as a drm_bridge. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> [bjorn: Drop connector->fwnode assignment and dev from struct msm_dp] Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Patchwork: https://patchwork.freedesktop.org/patch/514410/ Link: https://lore.kernel.org/r/20221207220012.16529-10-quic_bjorande@quicinc.com Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
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3 changed files with 25 additions and 0 deletions
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@ -1792,3 +1792,25 @@ void dp_bridge_hpd_disable(struct drm_bridge *bridge)
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dp_display->internal_hpd = false;
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}
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void dp_bridge_hpd_notify(struct drm_bridge *bridge,
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enum drm_connector_status status)
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{
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struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
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struct msm_dp *dp_display = dp_bridge->dp_display;
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struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
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/* Without next_bridge interrupts are handled by the DP core directly */
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if (dp_display->internal_hpd)
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return;
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if (!dp->core_initialized) {
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drm_dbg_dp(dp->drm_dev, "not initialized\n");
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return;
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}
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if (!dp_display->is_connected && status == connector_status_connected)
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dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
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else if (dp_display->is_connected && status == connector_status_disconnected)
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dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
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}
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@ -104,6 +104,7 @@ static const struct drm_bridge_funcs dp_bridge_ops = {
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.atomic_check = dp_bridge_atomic_check,
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.hpd_enable = dp_bridge_hpd_enable,
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.hpd_disable = dp_bridge_hpd_disable,
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.hpd_notify = dp_bridge_hpd_notify,
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};
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struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
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@ -34,5 +34,7 @@ void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
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const struct drm_display_mode *adjusted_mode);
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void dp_bridge_hpd_enable(struct drm_bridge *bridge);
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void dp_bridge_hpd_disable(struct drm_bridge *bridge);
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void dp_bridge_hpd_notify(struct drm_bridge *bridge,
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enum drm_connector_status status);
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#endif /* _DP_DRM_H_ */
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