Commit fa487b2a authored by Gil Fine's avatar Gil Fine Committed by Mika Westerberg
Browse files

thunderbolt: Add module parameter for CLx disabling 



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

Signed-off-by: default avatarGil Fine <gil.fine@intel.com>
Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 43f977bc

drivers/thunderbolt/switch.c

+11 −0
Original line number Diff line number Diff line
@@ -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);