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Diffstat (limited to 'drivers/thunderbolt/path.c')
-rw-r--r--drivers/thunderbolt/path.c47
1 files changed, 43 insertions, 4 deletions
diff --git a/drivers/thunderbolt/path.c b/drivers/thunderbolt/path.c
index a11956522bac..8c2e19a6117a 100644
--- a/drivers/thunderbolt/path.c
+++ b/drivers/thunderbolt/path.c
@@ -7,6 +7,8 @@
#include <linux/slab.h>
#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/ktime.h>
#include "tb.h"
@@ -74,14 +76,51 @@ 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;
+
+ /* 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);
- if (res)
+ res = __tb_path_deactivate_hop(path->hops[i].in_port,
+ path->hops[i].in_hop_index);
+ if (res && res != -ENODEV)
tb_port_warn(path->hops[i].in_port,
"hop deactivation failed for hop %d, index %d\n",
i, path->hops[i].in_hop_index);