From 2a7fade7e03a7c773f91e2e5ff26ad6fafda5a9f Mon Sep 17 00:00:00 2001 From: Samu Onkalo Date: Fri, 22 Oct 2010 07:57:27 -0400 Subject: [PATCH] hwmon: lis3: Power on corrections Sometimes lis3 chip seems to fail to setup factory tuning at boot up. This probably happens if there is some odd power ramp down ramp up sequence for example in device restart. Set boot bit in control2 register to trig boot sequence manually and wait until it is finished. Signed-off-by: Samu Onkalo Acked-by: Jonathan Cameron Acked-by: Eric Piel Signed-off-by: Guenter Roeck --- drivers/hwmon/lis3lv02d.c | 19 +++++++++++-------- drivers/hwmon/lis3lv02d.h | 1 + 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c index 1095dff9b200..7448411f51ea 100644 --- a/drivers/hwmon/lis3lv02d.c +++ b/drivers/hwmon/lis3lv02d.c @@ -307,19 +307,22 @@ void lis3lv02d_poweron(struct lis3lv02d *lis3) lis3->init(lis3); - /* LIS3 power on delay is quite long */ - msleep(lis3->pwron_delay / lis3lv02d_get_odr()); - /* * Common configuration * BDU: (12 bits sensors only) LSB and MSB values are not updated until * both have been read. So the value read will always be correct. + * Set BOOT bit to refresh factory tuning values. */ - if (lis3->whoami == WAI_12B) { - lis3->read(lis3, CTRL_REG2, ®); - reg |= CTRL2_BDU; - lis3->write(lis3, CTRL_REG2, reg); - } + lis3->read(lis3, CTRL_REG2, ®); + 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()); + if (lis3->reg_ctrl) lis3_context_restore(lis3); } diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h index e54a1672ae64..77ebb15ea0b3 100644 --- a/drivers/hwmon/lis3lv02d.h +++ b/drivers/hwmon/lis3lv02d.h @@ -150,6 +150,7 @@ enum lis3lv02d_ctrl4_3dc { enum lis302d_ctrl2 { HP_FF_WU2 = 0x08, HP_FF_WU1 = 0x04, + CTRL2_BOOT_8B = 0x40, }; enum lis3lv02d_ctrl3 { -- 2.20.1