Enabling the scrambling on reconnection seems to work so far but breaks
the HDMI2.0 specification and has introduced some issues in the past
with i915.
Let's do a mode set on the connector instead to follow the
specification.
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index ba939dab35c0..57310756d2cc 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -175,9 +175,8 @@ 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 void vc4_hdmi_handle_hotplug(struct vc4_hdmi *vc4_hdmi,
+ struct drm_modeset_acquire_ctx *ctx,
enum drm_connector_status status)
{
struct drm_connector *connector = &vc4_hdmi->connector;
@@ -190,6 +189,10 @@ static void vc4_hdmi_handle_hotplug(struct vc4_hdmi *vc4_hdmi,
* .adap_enable, which leads to that funtion being called with
* our mutex held.
*
+ * A similar situation occurs with
+ * drm_atomic_helper_connector_hdmi_reset_link() that will call
+ * into our KMS hooks if the scrambling was enabled.
+ *
* Concurrency isn't an issue at the moment since we don't share
* any state with any of the other frameworks so we can ignore
* the lock for now.
@@ -210,7 +213,7 @@ static void vc4_hdmi_handle_hotplug(struct vc4_hdmi *vc4_hdmi,
cec_s_phys_addr_from_edid(vc4_hdmi->cec_adap, edid);
kfree(edid);
- vc4_hdmi_enable_scrambling(&vc4_hdmi->encoder.base.base);
+ drm_atomic_helper_connector_hdmi_reset_link(connector, ctx);
}
static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector,
@@ -248,7 +251,7 @@ static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector,
status = connector_status_connected;
}
- vc4_hdmi_handle_hotplug(vc4_hdmi, status);
+ vc4_hdmi_handle_hotplug(vc4_hdmi, ctx, status);
pm_runtime_put(&vc4_hdmi->pdev->dev);
return status;
--
2.33.1
