If ->detect is called too soon after a hot plug event, the sink may not
be ready yet. So try up to 3 times with 1ms sleeps in between tries to
get the data (spec dictates that receivers must be ready to respond within
1ms and that sources should try 3 times).
See section 9.1 of the 1.1a DisplayPort spec.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
ironlake_dp_detect(struct intel_dp *intel_dp)
{
enum drm_connector_status status;
ironlake_dp_detect(struct intel_dp *intel_dp)
{
enum drm_connector_status status;
/* Can't disconnect eDP, but you can close the lid... */
if (is_edp(intel_dp)) {
/* Can't disconnect eDP, but you can close the lid... */
if (is_edp(intel_dp)) {
}
status = connector_status_disconnected;
}
status = connector_status_disconnected;
- if (intel_dp_aux_native_read(intel_dp,
- 0x000, intel_dp->dpcd,
- sizeof (intel_dp->dpcd))
- == sizeof(intel_dp->dpcd)) {
- if (intel_dp->dpcd[DP_DPCD_REV] != 0)
+ for (i = 0; i < 3; i++) {
+ ret = intel_dp_aux_native_read(intel_dp,
+ 0x000, intel_dp->dpcd,
+ sizeof (intel_dp->dpcd));
+ if (ret == sizeof(intel_dp->dpcd) &&
+ intel_dp->dpcd[DP_DPCD_REV] != 0) {
status = connector_status_connected;
status = connector_status_connected;
+ break;
+ }
+ msleep(1);
}
DRM_DEBUG_KMS("DPCD: %hx%hx%hx%hx\n", intel_dp->dpcd[0],
intel_dp->dpcd[1], intel_dp->dpcd[2], intel_dp->dpcd[3]);
}
DRM_DEBUG_KMS("DPCD: %hx%hx%hx%hx\n", intel_dp->dpcd[0],
intel_dp->dpcd[1], intel_dp->dpcd[2], intel_dp->dpcd[3]);