Commit 05faadcf authored by Takashi Iwai's avatar Takashi Iwai Committed by Linus Torvalds

lis3: fix regression of HP DriveGuard with 8bit chip

Commit 2a7fade7 ("hwmon: lis3: Power on corrections") caused a
regression on HP laptops with 8bit chip.  Writing CTRL2_BOOT_8B bit seems
clearing the BIOS setup, and no proper interrupt for DriveGuard will be
triggered any more.

Since the init code there is basically only for embedded devices, put a
pdata check so that the problematic initialization will be skipped for
hp_accel stuff.
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Cc: Eric Piel <eric.piel@tremplin-utc.net>
Cc: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: <stable@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@google.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0f86267b
......@@ -375,12 +375,14 @@ void lis3lv02d_poweron(struct lis3lv02d *lis3)
* both have been read. So the value read will always be correct.
* Set BOOT bit to refresh factory tuning values.
*/
if (lis3->pdata) {
lis3->read(lis3, CTRL_REG2, &reg);
if (lis3->whoami == WAI_12B)
reg |= CTRL2_BDU | CTRL2_BOOT;
else
reg |= CTRL2_BOOT_8B;
lis3->write(lis3, CTRL_REG2, reg);
}
/* LIS3 power on delay is quite long */
msleep(lis3->pwron_delay / lis3lv02d_get_odr());
......
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