-
Shubhangi Shrivastava authored
Sink count can change between short pulse hpd hence this patch adds a member variable to intel_dp so we can track any changes between short pulse interrupts. This patch reads sink_count dpcd always and removes its read operation based on values in downstream port dpcd. SINK_COUNT dpcd is not dependent on DOWNSTREAM_PORT_PRESENT dpcd. SINK_COUNT denotes if a display is attached, while DOWNSTREAM_PORT_PRESET indicates how many ports are available in the dongle where display can be attached. so it is possible for sink count to change irrespective of value in downstream port dpcd. Here is a table of possible values and scenarios sink_count downstream_port present 0 0 no display is attached 0 1 dongle is connected without display 1 0 display connected directly 1 1 display connected through dongle v2: Storing value of intel_dp->sink_count that is ready for consumption. (Ander) Squashing two commits into one. (Ander) v3: Added comment to explain the need of early return when sink count is 0. (Ander) Tested-by:
Nathan D Ciobanu <nathan.d.ciobanu@intel.com> Signed-off-by:
Sivakumar Thulasimani <sivakumar.thulasimani@intel.com> Signed-off-by:
Shubhangi Shrivastava <shubhangi.shrivastava@intel.com> Reviewed-by:
Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by:
Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1459341326-13142-4-git-send-email-shubhangi.shrivastava@intel.com
30d9aa42