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Subject[PATCH v2 1/2] input/serio/i8042.c: Skipt selftest on some ASUS laptops
Date
On suspend/resume cycle, selftest is executed on to reset i8042 controller. But
when this is done in these devices, posterior calls to detect/init functions
to elantech driver fails. Skipping selftest fixes this problem.

An easier step to reproduce this problem is adding i8042.reset=1 parameter.
On problematic laptops, it'll make the system to start with the
touchpad already stucked, since i8042 code forcibly calls the selftest function.

This patch was inspired by John Hiesey's change[1].

[1]: https://marc.info/?l=linux-input&m=144312209020616&w=2

Fixes: "ETPS/2 Elantech Touchpad dies after resume from suspend" (https://bugzilla.kernel.org/show_bug.cgi?id=107971)

Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
---
drivers/input/serio/i8042-x86ia64io.h | 70 ++++++++++++++++++++++++++++++++++-
drivers/input/serio/i8042.c | 38 ++++++++++++++++---
2 files changed, 100 insertions(+), 8 deletions(-)

diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index 68f5f4a..0107976 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -510,6 +510,66 @@ static const struct dmi_system_id __initconst i8042_dmi_nomux_table[] = {
{ }
};

+/*
+ * On some hardware just running the self test causes problems.
+ */
+static const struct dmi_system_id __initconst i8042_dmi_noselftest_table[] = {
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "K401LB"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "K501LB"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "K501LD"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "K501LX"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "X302LA"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "X450LCP"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "X450LD"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "X455LAB"),
+ },
+ },
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "X455LDB"),
+ },
+ },
+ { }
+};
static const struct dmi_system_id __initconst i8042_dmi_reset_table[] = {
{
/* MSI Wind U-100 */
@@ -1076,8 +1136,14 @@ static int __init i8042_platform_init(void)
#endif

#ifdef CONFIG_X86
- if (dmi_check_system(i8042_dmi_reset_table))
- i8042_reset = true;
+ /* Honor module parameter when value is not default */
+ if (i8042_reset == I8042_RESET_ON_RESUME) {
+ if (dmi_check_system(i8042_dmi_reset_table))
+ i8042_reset = I8042_RESET_ALWAYS;
+
+ if (dmi_check_system(i8042_dmi_noselftest_table))
+ i8042_reset = I8042_RESET_NEVER;
+ }

if (dmi_check_system(i8042_dmi_noloop_table))
i8042_noloop = true;
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 4541957..28ce5d2 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -48,9 +48,32 @@ static bool i8042_unlock;
module_param_named(unlock, i8042_unlock, bool, 0);
MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");

-static bool i8042_reset;
-module_param_named(reset, i8042_reset, bool, 0);
-MODULE_PARM_DESC(reset, "Reset controller during init and cleanup.");
+enum i8042_controller_reset_mode {
+ I8042_RESET_NEVER,
+ I8042_RESET_ALWAYS,
+ I8042_RESET_ON_RESUME
+};
+static unsigned int i8042_reset = I8042_RESET_ON_RESUME;
+static int i8042_set_reset(const char *val, const struct kernel_param *kp)
+{
+ unsigned int ret = I8042_RESET_ON_RESUME;
+ if (!val || !strncmp(val, "1", 1) || !strncasecmp(val, "y", 1))
+ ret = I8042_RESET_ALWAYS;
+ else if (!strncmp(val, "0", 1) || !strncasecmp(val, "n", 1))
+ ret = I8042_RESET_NEVER;
+
+ *((unsigned int *)kp->arg) = ret;
+
+ return 0;
+}
+
+static const struct kernel_param_ops param_ops_reset_param = {
+ .flags = KERNEL_PARAM_OPS_FL_NOARG,
+ .set = i8042_set_reset,
+};
+#define param_check_reset_param(name, p) __param_check(name, p, unsigned int)
+module_param_named(reset, i8042_reset, reset_param, 0);
+MODULE_PARM_DESC(reset, "Reset controller on resume, cleanup or both");

static bool i8042_direct;
module_param_named(direct, i8042_direct, bool, 0);
@@ -890,6 +913,9 @@ static int i8042_controller_selftest(void)
unsigned char param;
int i = 0;

+ if (i8042_reset == I8042_RESET_NEVER)
+ return 0;
+
/*
* We try this 5 times; on some really fragile systems this does not
* take the first time...
@@ -1044,7 +1070,7 @@ static void i8042_controller_reset(bool force_reset)
* Reset the controller if requested.
*/

- if (i8042_reset || force_reset)
+ if (force_reset)
i8042_controller_selftest();

/*
@@ -1118,7 +1144,7 @@ static int i8042_controller_resume(bool force_reset)
if (error)
return error;

- if (i8042_reset || force_reset) {
+ if (force_reset) {
error = i8042_controller_selftest();
if (error)
return error;
@@ -1495,7 +1521,7 @@ static int __init i8042_probe(struct platform_device *dev)

i8042_platform_device = dev;

- if (i8042_reset) {
+ if (i8042_reset == I8042_RESET_ALWAYS) {
error = i8042_controller_selftest();
if (error)
return error;
--
2.7.4
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