From d44b9827e7f460c7555800065de81b75f4967145 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Mon, 11 Dec 2023 13:45:37 +0200 Subject: [PATCH] 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: Mika Westerberg --- drivers/thunderbolt/tb.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 64dd22e1f5b294..5b0434c140f93f 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -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;