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Subject[PATCH] ACPI: Parse entire table as a term_list for Dell XPS 9570 and Precision M5530
Date
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.limonciello@dell.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@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
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