Commit d44b9827 authored by Mika Westerberg's avatar Mika Westerberg
Browse files

thunderbolt: Re-calculate estimated bandwidth when allocation mode is enabled 



When we program the initial bandwidth estimation the DPTX (graphics
driver) has not yet read the capabilities of the monitor so the values
used are the highest possible of the involved DisplayPort IN and OUT
adapters, not the actual monitor capabilities. To allow the graphics
more accurate bandwidth estimation re-calculate it once we receive the
bandwidth allocation mode enabled notification.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 7b5e0bfc

drivers/thunderbolt/tb.c

+12 −3
Original line number Diff line number Diff line
@@ -2413,10 +2413,19 @@ static void tb_handle_dp_bandwidth_request(struct work_struct *work) 


	ret = usb4_dp_port_requested_bandwidth(in);

	if (ret < 0) {

		if (ret == -ENODATA)

			tb_port_dbg(in, "no bandwidth request active\n");

		else

		if (ret == -ENODATA) {

			/*

			 * There is no request active so this means the

			 * BW allocation mode was enabled from graphics

			 * side. At this point we know that the graphics

			 * driver has read the DRPX capabilities so we

			 * can offer an better bandwidth estimatation.

			 */

			tb_port_dbg(in, "DPTX enabled bandwidth allocation mode, updating estimated bandwidth\n");

			tb_recalc_estimated_bandwidth(tb);

		} else {

			tb_port_warn(in, "failed to read requested bandwidth\n");

		}

		goto put_sw;

	}

	requested_bw = ret;