drm/i915/tv: Only poll for TV connections

As a probe for a TV connection modifies the TV_CTL register, it causes a
loss of sync and a regular glitch on the output. This is highly
undesirable when using the TV, so only poll for TV connections and wait
for an explicit query for detecting the disconnection event.

Reported-by: Mathew McKernan <matmckernan@rauland.com.au>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35977
Signed-off-by: Mathew McKernan <matmckernan@rauland.com.au>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 0be2265d1f3930e1b77bfa574b1bd20fd01666bb..f5848cb915622ac5710c488a14cb65d3fd8aec03 100644 (file)
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1672,8 +1672,7 @@ intel_tv_init(struct drm_device *dev)
         *
         * More recent chipsets favour HDMI rather than integrated S-Video.
         */
-       connector->polled =
-               DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
+       connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 
        drm_connector_init(dev, connector, &intel_tv_connector_funcs,
                           DRM_MODE_CONNECTOR_SVIDEO);