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Revert "Input: psmouse - add delay when deactivating for SMBus mode"

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This reverts commit 92e24e0e57.

While the patch itself is correct, it uncovered an issue with fallback
to PS/2 mode, where we were leaving psmouse->fast_reconnect handler set
to psmouse_smbus_reconnect(), which caused crashes.

While discussing various approaches to fix the issue it was noted that
this patch ass undesired delay in the "fast" resume path of PS/2 device,
and it would be better to actually use "reset_delay" option defined in
struct rmi_device_platform_data and have RMI code handle it for SMBus
transport as well. So this patch is being reverted to deal with crashes
and a better solution will be merged shortly.

Reported-by: Thorsten Leemhuis <linux@leemhuis.info>
Closes: https://lore.kernel.org/all/ca0109fa-c64b-43c1-a651-75b294d750a1@leemhuis.info/
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2023-10-12 15:54:21 -07:00
parent 423622a90a
commit b357263963
1 changed files with 7 additions and 12 deletions
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19
drivers/input/mouse/psmouse-smbus.c
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@ -5,7 +5,6 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/libps2.h>
@ -119,18 +118,13 @@ static psmouse_ret_t psmouse_smbus_process_byte(struct psmouse *psmouse)
return PSMOUSE_FULL_PACKET;
}
static void psmouse_activate_smbus_mode(struct psmouse_smbus_dev *smbdev)
{
if (smbdev->need_deactivate) {
psmouse_deactivate(smbdev->psmouse);
/* Give the device time to switch into SMBus mode */
msleep(30);
}
}
static int psmouse_smbus_reconnect(struct psmouse *psmouse)
{
psmouse_activate_smbus_mode(psmouse->private);
struct psmouse_smbus_dev *smbdev = psmouse->private;
if (smbdev->need_deactivate)
psmouse_deactivate(psmouse);
return 0;
}
@ -263,7 +257,8 @@ int psmouse_smbus_init(struct psmouse *psmouse,
}
}
psmouse_activate_smbus_mode(smbdev);
if (need_deactivate)
psmouse_deactivate(psmouse);
psmouse->private = smbdev;
psmouse->protocol_handler = psmouse_smbus_process_byte;