diff options
| author | Bjorn Andersson <bjorn.andersson@linaro.org> | 2022-12-07 14:00:09 -0800 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2023-01-09 03:06:43 +0200 |
| commit | 542b37efc20e64854df87819eeed2c45c5c83e29 (patch) | |
| tree | b123916a78c21c609d3980371eda4a2c912a9c00 /drivers/gpu/drm | |
| parent | cd198caddea72880693b965ac3c30eb1d4982541 (diff) | |
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>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_display.c | 22 | ||||
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_drm.c | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_drm.h | 2 |
3 files changed, 25 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 720dc2c812d6..031ebdcd689c 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -1792,3 +1792,25 @@ void dp_bridge_hpd_disable(struct drm_bridge *bridge) dp_display->internal_hpd = false; } + +void dp_bridge_hpd_notify(struct drm_bridge *bridge, + enum drm_connector_status status) +{ + struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge); + struct msm_dp *dp_display = dp_bridge->dp_display; + struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display); + + /* Without next_bridge interrupts are handled by the DP core directly */ + if (dp_display->internal_hpd) + return; + + if (!dp->core_initialized) { + drm_dbg_dp(dp->drm_dev, "not initialized\n"); + return; + } + + if (!dp_display->is_connected && status == connector_status_connected) + dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0); + else if (dp_display->is_connected && status == connector_status_disconnected) + dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0); +} diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c index 9d03b6ee3c41..275370f21115 100644 --- a/drivers/gpu/drm/msm/dp/dp_drm.c +++ b/drivers/gpu/drm/msm/dp/dp_drm.c @@ -104,6 +104,7 @@ static const struct drm_bridge_funcs dp_bridge_ops = { .atomic_check = dp_bridge_atomic_check, .hpd_enable = dp_bridge_hpd_enable, .hpd_disable = dp_bridge_hpd_disable, + .hpd_notify = dp_bridge_hpd_notify, }; struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev, diff --git a/drivers/gpu/drm/msm/dp/dp_drm.h b/drivers/gpu/drm/msm/dp/dp_drm.h index 1f871b555006..250f7c66201f 100644 --- a/drivers/gpu/drm/msm/dp/dp_drm.h +++ b/drivers/gpu/drm/msm/dp/dp_drm.h @@ -34,5 +34,7 @@ void dp_bridge_mode_set(struct drm_bridge *drm_bridge, const struct drm_display_mode *adjusted_mode); void dp_bridge_hpd_enable(struct drm_bridge *bridge); void dp_bridge_hpd_disable(struct drm_bridge *bridge); +void dp_bridge_hpd_notify(struct drm_bridge *bridge, + enum drm_connector_status status); #endif /* _DP_DRM_H_ */ |