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thunderbolt: Set sleep bit when suspending switch 

Thunderbolt 2 devices and beyond link controller needs to be notified
when a switch is going to be suspended by setting bit 31 in LC_SX_CTRL
register. Add this functionality to the software connection manager.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2019-01-09 17:25:43 +02:00
parent e879a709de
commit 5480dfc275
4 changed files with 49 additions and 4 deletions
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44
drivers/thunderbolt/lc.c
View File

@ -133,3 +133,47 @@ void tb_lc_unconfigure_link(struct tb_switch *sw)
tb_lc_configure_lane(up, false);
tb_lc_configure_lane(down, false);
}
/**
* tb_lc_set_sleep() - Inform LC that the switch is going to sleep
* @sw: Switch to set sleep
*
* Let the switch link controllers know that the switch is going to
* sleep.
*/
int tb_lc_set_sleep(struct tb_switch *sw)
{
int start, size, nlc, ret, i;
u32 desc;
if (sw->generation < 2)
return 0;
ret = read_lc_desc(sw, &desc);
if (ret)
return ret;
/* Figure out number of link controllers */
nlc = desc & TB_LC_DESC_NLC_MASK;
start = (desc & TB_LC_DESC_SIZE_MASK) >> TB_LC_DESC_SIZE_SHIFT;
size = (desc & TB_LC_DESC_PORT_SIZE_MASK) >> TB_LC_DESC_PORT_SIZE_SHIFT;
/* For each link controller set sleep bit */
for (i = 0; i < nlc; i++) {
unsigned int offset = sw->cap_lc + start + i * size;
u32 ctrl;
ret = tb_sw_read(sw, &ctrl, TB_CFG_SWITCH,
offset + TB_LC_SX_CTRL, 1);
if (ret)
return ret;
ctrl |= TB_LC_SX_CTRL_SLP;
ret = tb_sw_write(sw, &ctrl, TB_CFG_SWITCH,
offset + TB_LC_SX_CTRL, 1);
if (ret)
return ret;
}
return 0;
}

6
drivers/thunderbolt/switch.c
View File

@ -1586,10 +1586,8 @@ void tb_switch_suspend(struct tb_switch *sw)
if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
tb_switch_suspend(sw->ports[i].remote->sw);
}
/*
* TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any
* effect?
*/
tb_lc_set_sleep(sw);
}
struct tb_sw_lookup {

1
drivers/thunderbolt/tb.h
View File

@ -467,6 +467,7 @@ int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
int tb_lc_read_uuid(struct tb_switch *sw, u32 *uuid);
int tb_lc_configure_link(struct tb_switch *sw);
void tb_lc_unconfigure_link(struct tb_switch *sw);
int tb_lc_set_sleep(struct tb_switch *sw);
static inline int tb_route_length(u64 route)
{

2
drivers/thunderbolt/tb_regs.h
View File

@ -239,6 +239,7 @@ struct tb_regs_hop {
/* Common link controller registers */
#define TB_LC_DESC 0x02
#define TB_LC_DESC_NLC_MASK GENMASK(3, 0)
#define TB_LC_DESC_SIZE_SHIFT 8
#define TB_LC_DESC_SIZE_MASK GENMASK(15, 8)
#define TB_LC_DESC_PORT_SIZE_SHIFT 16
@ -250,5 +251,6 @@ struct tb_regs_hop {
#define TB_LC_SX_CTRL_L1C BIT(16)
#define TB_LC_SX_CTRL_L2C BIT(20)
#define TB_LC_SX_CTRL_UPSTREAM BIT(30)
#define TB_LC_SX_CTRL_SLP BIT(31)
#endif