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Subject[PATCH v2 07/14] thunderbolt: Enable plug events
Date
Thunderbolt switches have a plug events capability. This patch adds the
tb_plug_events_active method and uses it to activate plug events during
switch allocation.

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
---
drivers/thunderbolt/switch.c | 46 ++++++++++++++++++++++++++++++++++++++++++++
drivers/thunderbolt/tb.h | 1 +
2 files changed, 47 insertions(+)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index e89121f..21457cc 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -99,6 +99,39 @@ static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
}

/**
+ * tb_plug_events_active() - enable/disable plug events on a switch
+ *
+ * Also configures a sane plug_events_delay of 255ms.
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+static int tb_plug_events_active(struct tb_switch *sw, bool active)
+{
+ u32 data;
+ int res;
+
+ sw->config.plug_events_delay = 0xff;
+ res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
+ if (res)
+ return res;
+
+ res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
+ if (res)
+ return res;
+
+ if (active) {
+ data = data & 0xFFFFFF83;
+ if (sw->config.device_id == 0x1547)
+ data |= 4;
+ } else {
+ data = data | 0x7c;
+ }
+ return tb_sw_write(sw, &data, TB_CFG_SWITCH,
+ sw->cap_plug_events + 1, 1);
+}
+
+
+/**
* tb_switch_free() - free a tb_switch and all downstream switches
*/
void tb_switch_free(struct tb_switch *sw)
@@ -113,6 +146,8 @@ void tb_switch_free(struct tb_switch *sw)
sw->ports[i].remote = NULL;
}

+ tb_plug_events_active(sw, false);
+
kfree(sw->ports);
kfree(sw);
}
@@ -125,6 +160,7 @@ void tb_switch_free(struct tb_switch *sw)
struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
{
int i;
+ int cap;
struct tb_switch *sw;
int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
if (upstream_port < 0)
@@ -177,6 +213,16 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)

/* TODO: I2C, IECS, EEPROM, link controller */

+ cap = tb_find_cap(&sw->ports[0], TB_CFG_SWITCH, TB_CAP_PLUG_EVENTS);
+ if (cap < 0) {
+ tb_sw_warn(sw, "cannot find TB_CAP_PLUG_EVENTS aborting\n");
+ goto err;
+ }
+ sw->cap_plug_events = cap;
+
+ if (tb_plug_events_active(sw, true))
+ goto err;
+
return sw;
err:
kfree(sw->ports);
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index e620f1b..feb6c7a 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -19,6 +19,7 @@ struct tb_switch {
struct tb_regs_switch_header config;
struct tb_port *ports;
struct tb *tb;
+ int cap_plug_events; /* offset, zero if not found */
};

/**
--
1.9.2


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