[PATCH v7 09/10] drm/vc4: hdmi: Enable the scrambler on reconnection

[Maxime Ripard]

If we have a state already and disconnect/reconnect the display, the
SCDC messages won't be sent again since we didn't go through a disable /
enable cycle.

In order to fix this, let's call the vc4_hdmi_enable_scrambling function
in the detect callback if there is a mode and it needs the scrambler to
be enabled.

Fixes: c85695a2016e ("drm/vc4: hdmi: Enable the scrambler")
Signed-off-by: Maxime Ripard <max...@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index d2a720e05ddd..a3dbd1fdff7d 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -161,6 +161,8 @@ static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi 
*vc4_hdmi)
 static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi *vc4_hdmi) {}
 #endif
 
+static void vc4_hdmi_enable_scrambling(struct drm_encoder *encoder);
+
 static enum drm_connector_status
 vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
 {
@@ -187,7 +189,9 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, 
bool force)
                        }
                }
 
+               vc4_hdmi_enable_scrambling(&vc4_hdmi->encoder.base.base);
                pm_runtime_put(&vc4_hdmi->pdev->dev);
+
                return connector_status_connected;
        }
 
@@ -543,8 +547,12 @@ static void vc4_hdmi_enable_scrambling(struct drm_encoder 
*encoder)
        struct drm_connector *connector = &vc4_hdmi->connector;
        struct drm_connector_state *cstate = connector->state;
        struct drm_crtc *crtc = cstate->crtc;
-       struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+       struct drm_display_mode *mode;
 
+       if (!crtc || !crtc->state)
+               return;
+
+       mode = &crtc->state->adjusted_mode;
        if (!vc4_hdmi_supports_scrambling(encoder, mode))
                return;
 
-- 
2.31.1