The i2c touchpad on Dell XPS 9570 and Precision M5530 doesn't work out of box.
The touchpad relies on its _INI method to update its _HID value from XXXX0000 to SYNA2393. Also, the _STA relies on value of I2CN to report correct status. Set acpi_gbl_parse_table_as_term_list so the value of I2CN can be correctly set up, and _INI can get run. The ACPI table in this machine is designed to get parsed this way. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=198515 Cc: Mario Limonciello <mario.limoncie...@dell.com> Signed-off-by: Kai-Heng Feng <kai.heng.f...@canonical.com> --- drivers/acpi/bus.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 4d0979e02a28..4da34d67e23d 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -88,6 +86,45 @@ static const struct dmi_system_id dsdt_dmi_table[] __initconst = { }; #endif +#ifdef CONFIG_X86 +static int set_gbl_term_list(const struct dmi_system_id *id) +{ + pr_notice("%s detected - parse the entire table as a term_list\n", + id->ident); + acpi_gbl_parse_table_as_term_list = 1; + return 0; +} + +static const struct dmi_system_id gbl_term_list_dmi_table[] __initconst = { + /* + * Touchpad on Dell XPS 9570/Precision M5530 doesn't work under I2C + * mode. + * https://bugzilla.kernel.org/show_bug.cgi?id=198515 + */ + { + .callback = set_gbl_term_list, + .ident = "Dell Precision M5530", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Precision M5530"), + }, + }, + { + .callback = set_gbl_term_list, + .ident = "Dell XPS 15 9570", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"), + }, + }, + {} +}; +#else +static const struct dmi_system_id gbl_term_list_dmi_table[] __initconst = { + {} +}; +#endif + /* -------------------------------------------------------------------------- Device Management -------------------------------------------------------------------------- */ @@ -1007,6 +1046,8 @@ void __init acpi_early_init(void) */ dmi_check_system(dsdt_dmi_table); + dmi_check_system(gbl_term_list_dmi_table); + status = acpi_reallocate_root_table(); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX -- 2.15.1
