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thunderbolt: Add module parameter for CLx disabling

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Add a module parameter that allows user to completely disable CLx
functionality in case problems are found.

Signed-off-by: Gil Fine <gil.fine@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Gil Fine 2021-12-17 03:16:44 +02:00 committed by Mika Westerberg
parent 43f977bc60
commit fa487b2a90
1 changed files with 11 additions and 0 deletions
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11
drivers/thunderbolt/switch.c
View file

@ -13,6 +13,7 @@
#include <linux/sched/signal.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/module.h>
#include "tb.h"
@ -26,6 +27,10 @@ struct nvm_auth_status {
u32 status;
};
static bool clx_enabled = true;
module_param_named(clx, clx_enabled, bool, 0444);
MODULE_PARM_DESC(clx, "allow low power states on the high-speed lanes (default: true)");
/*
* Hold NVM authentication failure status per switch This information
* needs to stay around even when the switch gets power cycled so we
@ -3478,6 +3483,9 @@ int tb_switch_enable_clx(struct tb_switch *sw, enum tb_clx clx)
{
struct tb_switch *root_sw = sw->tb->root_switch;
if (!clx_enabled)
return 0;
/*
* CLx is not enabled and validated on Intel USB4 platforms before
* Alder Lake.
@ -3539,6 +3547,9 @@ static int tb_switch_disable_cl0s(struct tb_switch *sw)
*/
int tb_switch_disable_clx(struct tb_switch *sw, enum tb_clx clx)
{
if (!clx_enabled)
return 0;
switch (clx) {
case TB_CL0S:
return tb_switch_disable_cl0s(sw);