anonfunc/IT87
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Force IT8790E and IT8792E into configuration mode

Browse Source 
IT8790E and IT8792E need to be in configuration mode to avoid LPC bus errors.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck
2017-08-06 15:00:33 -07:00
parent ce2074226c
commit e7762ac1c0
1 changed files with 44 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
it87.c
View File

@@ -2833,6 +2833,7 @@ static int __init it87_find(int sioaddr, unsigned short *address,
break;
case IT8790E_DEVID:
sio_data->type = it8790;
doexit = false; /* See IT8792E comment above */
break;
case IT8603E_DEVID:
case IT8623E_DEVID:
@@ -3821,9 +3822,28 @@ exit_device_put:
}
struct it87_dmi_data {
bool sio2_force_config; /* force sio2 into configuration mode */
u8 skip_pwm; /* pwm channels to skip for this board */
};
/*
* On various Gigabyte AM4 boards (AB350, AX370), the second Super-IO chip
* (IT8792E) needs to be in configuration mode before accessing the first
* due to a bug in IT8792E which otherwise results in LPC bus access errors.
* This needs to be done before accessing the first Super-IO chip since
* the second chip may have been accessed prior to loading this driver.
*
* The problem is also reported to affect IT8795E, which is used on X299 boards
* and has the same chip ID as IT9792E (0x8733). It also appears to affect
* systems with IT8790E, which is used on some Z97X-Gaming boards as well as
* Z87X-OC.
* DMI entries for those systems will be added as they become available and
* as the problem is confirmed to affect those boards.
*/
static struct it87_dmi_data gigabyte_sio2_force = {
.sio2_force_config = true,
};
/*
* On the Shuttle SN68PT, FAN_CTL2 is apparently not
* connected to a fan, but to something else. One user
@@ -3837,6 +3857,27 @@ static struct it87_dmi_data nvidia_fn68pt = {
};
static const struct dmi_system_id it87_dmi_table[] __initconst = {
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Gigabyte Technology Co., Ltd."),
DMI_MATCH(DMI_BOARD_NAME, "AB350"),
},
.driver_data = &gigabyte_sio2_force,
},
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Gigabyte Technology Co., Ltd."),
DMI_MATCH(DMI_BOARD_NAME, "AX370"),
},
.driver_data = &gigabyte_sio2_force,
},
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Gigabyte Technology Co., Ltd."),
DMI_MATCH(DMI_BOARD_NAME, "Z97X-Gaming G1"),
},
.driver_data = &gigabyte_sio2_force,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "nVIDIA"),
@@ -3864,6 +3905,9 @@ static int __init sm_it87_init(void)
if (err)
return err;
if (dmi_data && dmi_data->sio2_force_config)
__superio_enter(REG_4E);
for (i = 0; i < ARRAY_SIZE(sioaddr); i++) {
memset(&sio_data, 0, sizeof(struct it87_sio_data));
isa_address = 0;