thunderbolt: Log an error if DPTX request is not cleared

This helps debugging issues around DisplayPort bandwidth allocation
mode.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c
index 4b35898aa216697bfe3d4d698efa6ce0beb901d6..f4fba144105d03dcdf99b84c0cd4b04d1abb0678 100644 (file)
--- a/drivers/thunderbolt/usb4.c
+++ b/drivers/thunderbolt/usb4.c
@@ -2858,8 +2858,10 @@ static int usb4_dp_port_wait_and_clear_cm_ack(struct tb_port *port,
                usleep_range(50, 100);
        } while (ktime_before(ktime_get(), end));
 
-       if (val & ADP_DP_CS_8_DR)
+       if (val & ADP_DP_CS_8_DR) {
+               tb_port_warn(port, "timeout waiting for DPTX request to clear\n");
                return -ETIMEDOUT;
+       }
 
        ret = tb_port_read(port, &val, TB_CFG_PORT,
                           port->cap_adap + ADP_DP_CS_2, 1);