@@ -7,6 +7,8 @@
#include <linux/slab.h>
#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/ktime.h>
#include "tb.h"
@@ -74,13 +76,53 @@ static void __tb_path_deallocate_nfc(struct tb_path *path, int first_hop)
}
}
+static int __tb_path_deactivate_hop(struct tb_port *port, int hop_index)
+{
+ struct tb_regs_hop hop;
+ ktime_t timeout;
+ int ret;
+
+ if (port->sw->is_unplugged)
+ return 0;
+
+ /* Disable the path */
+ ret = tb_port_read(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2);
+ if (ret)
+ return ret;
+
+ /* Already disabled */
+ if (!hop.enable)
+ return 0;
+
+ hop.enable = 0;
+
+ ret = tb_port_write(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2);
+ if (ret)
+ return ret;
+
+ /* Wait until it is drained */
+ timeout = ktime_add_ms(ktime_get(), 500);
+ do {
+ ret = tb_port_read(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2);
+ if (ret)
+ return ret;
+
+ if (!hop.pending)
+ return 0;
+
+ usleep_range(10, 20);
+ } while (ktime_before(ktime_get(), timeout));
+
+ return -ETIMEDOUT;
+}
+
static void __tb_path_deactivate_hops(struct tb_path *path, int first_hop)
{
int i, res;
- struct tb_regs_hop hop = { };
+
for (i = first_hop; i < path->path_length; i++) {
- res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS,
- 2 * path->hops[i].in_hop_index, 2);
+ res = __tb_path_deactivate_hop(path->hops[i].in_port,
+ path->hops[i].in_hop_index);
if (res)
tb_port_warn(path->hops[i].in_port,
"hop deactivation failed for hop %d, index %d\n",
@@ -234,7 +234,8 @@ struct tb_regs_hop {
bool egress_fc:1;
bool ingress_shared_buffer:1;
bool egress_shared_buffer:1;
- u32 unknown3:4; /* set to zero */
+ bool pending:1;
+ u32 unknown3:3; /* set to zero */
} __packed;
/* Common link controller registers */
We need to wait until all buffers have been drained before the path can be considered disabled. Do this for every hop in a path. Also if the switch is physically disconnected, do not bother disabling it anymore (it is not present anyway). This adds another bit field to struct tb_regs_hop even if we are trying to get rid of them but we can clean them up another day. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> --- drivers/thunderbolt/path.c | 48 ++++++++++++++++++++++++++++++++--- drivers/thunderbolt/tb_regs.h | 3 ++- 2 files changed, 47 insertions(+), 4 deletions(-)