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Subject[PATCH 7/8] [media] staging: atomisp: convert timestamps to ktime_t
Date
timespec overflows in 2038 on 32-bit architectures, and the
getnstimeofday() suffers from possible time jumps, so the
timestamps here are better done using ktime_get(), which has
neither of those problems.

In case of ov2680, we don't seem to use the timestamp at
all, so I just remove it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/staging/media/atomisp/i2c/ov2680.h | 1 -
drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c | 15 ++++++---------
drivers/staging/media/atomisp/i2c/ov5693/ov5693.h | 2 +-
3 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/media/atomisp/i2c/ov2680.h b/drivers/staging/media/atomisp/i2c/ov2680.h
index bf4897347df7..03f75dd80f87 100644
--- a/drivers/staging/media/atomisp/i2c/ov2680.h
+++ b/drivers/staging/media/atomisp/i2c/ov2680.h
@@ -174,7 +174,6 @@ struct ov2680_format {
struct mutex input_lock;
struct v4l2_ctrl_handler ctrl_handler;
struct camera_sensor_platform_data *platform_data;
- struct timespec timestamp_t_focus_abs;
int vt_pix_clk_freq_mhz;
int fmt_idx;
int run_mode;
diff --git a/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c b/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c
index 3e7c3851280f..a715ea0e4230 100644
--- a/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c
+++ b/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c
@@ -973,7 +973,7 @@ static int ov5693_t_focus_abs(struct v4l2_subdev *sd, s32 value)
if (ret == 0) {
dev->number_of_steps = value - dev->focus;
dev->focus = value;
- getnstimeofday(&(dev->timestamp_t_focus_abs));
+ dev->timestamp_t_focus_abs = ktime_get();
} else
dev_err(&client->dev,
"%s: i2c failed. ret %d\n", __func__, ret);
@@ -993,16 +993,13 @@ static int ov5693_q_focus_status(struct v4l2_subdev *sd, s32 *value)
{
u32 status = 0;
struct ov5693_device *dev = to_ov5693_sensor(sd);
- struct timespec temptime;
- const struct timespec timedelay = {
- 0,
+ ktime_t temptime;
+ ktime_t timedelay = ns_to_ktime(
min((u32)abs(dev->number_of_steps) * DELAY_PER_STEP_NS,
- (u32)DELAY_MAX_PER_STEP_NS),
- };
+ (u32)DELAY_MAX_PER_STEP_NS));

- getnstimeofday(&temptime);
- temptime = timespec_sub(temptime, (dev->timestamp_t_focus_abs));
- if (timespec_compare(&temptime, &timedelay) <= 0) {
+ temptime = ktime_sub(ktime_get(), (dev->timestamp_t_focus_abs));
+ if (ktime_compare(temptime, timedelay) <= 0) {
status |= ATOMISP_FOCUS_STATUS_MOVING;
status |= ATOMISP_FOCUS_HP_IN_PROGRESS;
} else {
diff --git a/drivers/staging/media/atomisp/i2c/ov5693/ov5693.h b/drivers/staging/media/atomisp/i2c/ov5693/ov5693.h
index 2ea63807c56d..68cfcb4a6c3c 100644
--- a/drivers/staging/media/atomisp/i2c/ov5693/ov5693.h
+++ b/drivers/staging/media/atomisp/i2c/ov5693/ov5693.h
@@ -221,7 +221,7 @@ struct ov5693_device {
struct v4l2_ctrl_handler ctrl_handler;

struct camera_sensor_platform_data *platform_data;
- struct timespec timestamp_t_focus_abs;
+ ktime_t timestamp_t_focus_abs;
int vt_pix_clk_freq_mhz;
int fmt_idx;
int run_mode;
--
2.9.0
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