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driver: BMM150: Set max frequency based on repetitions setting

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The compass uses oversampling to produce accurate values.
MAX_ODR is functions of the repetitions setting.
80Hz is too high, calculate the frequency based on preset setting.
Currently, we use 'SPECIAL' that was calculated for Ryu.

BUG=b:68394559
BRANCH=eve,reef,poppy
TEST=Check with ectool motionsense info 3 the frequency is around 30Hz.
Before:
Min Frequency:              781 mHz
Max Frequency:              80000 mHz
After:
Min Frequency:              781 mHz
Max Frequency:              29579 mHz
Check with AIDA64 the compass is not stuck and return changing values.

Fixup of CL/570482

Change-Id: Idcfed1418f59e755e5647d018351c6a7397ffe1b
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/742146
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
This commit is contained in:
Gwendal Grignou
2017-10-27 15:07:19 -07:00
committed by chrome-bot
parent a0f43d59d0
commit 8a2d0a5de6
5 changed files with 14 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
board/eve/board.c
View File

@@ -903,7 +903,7 @@ struct motion_sensor_t motion_sensors[] = {
.default_range = 1 << 11, /* 16LSB / uT, fixed */
.rot_standard_ref = &mag_standard_ref,
.min_frequency = BMM150_MAG_MIN_FREQ,
.max_frequency = BMM150_MAG_MAX_FREQ,
.max_frequency = BMM150_MAG_MAX_FREQ(SPECIAL),
.config = {
/* AP: by default shutdown all sensors */
[SENSOR_CONFIG_AP] = {

2
board/nautilus/board.c
View File

@@ -976,7 +976,7 @@ struct motion_sensor_t motion_sensors[] = {
.default_range = 1 << 11, /* 16LSB / uT, fixed */
.rot_standard_ref = &mag_standard_ref,
.min_frequency = BMM150_MAG_MIN_FREQ,
.max_frequency = BMM150_MAG_MAX_FREQ,
.max_frequency = BMM150_MAG_MAX_FREQ(SPECIAL),
.config = {
/* AP: by default shutdown all sensors */
[SENSOR_CONFIG_AP] = {

2
board/poppy/board.c
View File

@@ -998,7 +998,7 @@ struct motion_sensor_t motion_sensors[] = {
.default_range = 1 << 11, /* 16LSB / uT, fixed */
.rot_standard_ref = &mag_standard_ref,
.min_frequency = BMM150_MAG_MIN_FREQ,
.max_frequency = BMM150_MAG_MAX_FREQ,
.max_frequency = BMM150_MAG_MAX_FREQ(SPECIAL),
.config = {
/* AP: by default shutdown all sensors */
[SENSOR_CONFIG_AP] = {

2
board/reef/board.c
View File

@@ -956,7 +956,7 @@ struct motion_sensor_t motion_sensors[] = {
.default_range = 1 << 11, /* 16LSB / uT, fixed */
.rot_standard_ref = &mag_standard_ref,
.min_frequency = BMM150_MAG_MIN_FREQ,
.max_frequency = BMM150_MAG_MAX_FREQ,
.max_frequency = BMM150_MAG_MAX_FREQ(SPECIAL),
.config = {
/* AP: by default shutdown all sensors */
[SENSOR_CONFIG_AP] = {

11
driver/mag_bmm150.h
View File

@@ -76,7 +76,16 @@
/* Min and Max sampling frequency in mHz */
#define BMM150_MAG_MIN_FREQ 781
#define BMM150_MAG_MAX_FREQ 80000
/*
* From Section 4.2.4, max frequency depends on the preset.
*
* Fmax ~= 1 / (145us * nXY + 500us * nZ + 980us)
*
* To be safe, declare only 75% of the value.
*/
#define BMM150_MAG_MAX_FREQ(_preset) (750000000 / \
(145 * BMM150_REP(_preset, XY) + 500 * BMM150_REP(_preset, Z) + 980))
struct bmm150_comp_registers {
/* Local copy of the compensation registers. */