msm: camera: Change Avtimer timestamp implementation
If video telephony app uses camera, timestamp need to be more
accurate. Use hardware registers to read time in nano seconds
and fill it in buffer.
Change-Id: I25c321ec83fb952f09a57b1b0ad46b0458a990a1
Signed-off-by: Abhishek kondaveeti <akondave@codeaurora.org>
diff --git a/drivers/media/platform/msm/camera_v2/isp/msm_isp_util.c b/drivers/media/platform/msm/camera_v2/isp/msm_isp_util.c
index ffe0b9c..60c9aef 100644
--- a/drivers/media/platform/msm/camera_v2/isp/msm_isp_util.c
+++ b/drivers/media/platform/msm/camera_v2/isp/msm_isp_util.c
@@ -13,6 +13,7 @@
#include <linux/io.h>
#include <media/v4l2-subdev.h>
#include <linux/ratelimit.h>
+#include <asm/div64.h>
#include "msm.h"
#include "msm_isp_util.h"
@@ -28,7 +29,6 @@
#define MSM_ISP_MIN_IB 450000000
#define VFE40_8974V2_VERSION 0x1001001A
-
static struct msm_bus_vectors msm_isp_init_vectors[] = {
{
.src = MSM_BUS_MASTER_VFE,
@@ -217,7 +217,8 @@
{
uint32_t avtimer_msw_1st = 0, avtimer_lsw = 0;
uint32_t avtimer_msw_2nd = 0;
- uint8_t iter = 0;
+ uint64_t av_timer_tick = 0;
+
if (!vfe_dev->p_avtimer_msw || !vfe_dev->p_avtimer_lsw) {
pr_err("%s: ioremap failed\n", __func__);
return;
@@ -226,15 +227,10 @@
avtimer_msw_1st = msm_camera_io_r(vfe_dev->p_avtimer_msw);
avtimer_lsw = msm_camera_io_r(vfe_dev->p_avtimer_lsw);
avtimer_msw_2nd = msm_camera_io_r(vfe_dev->p_avtimer_msw);
- } while ((avtimer_msw_1st != avtimer_msw_2nd)
- && (iter++ < AVTIMER_ITERATION_CTR));
- /*Just return if the MSW TimeStamps don't converge after
- a few iterations Application needs to handle the zero TS values*/
- if (iter >= AVTIMER_ITERATION_CTR) {
- pr_err("%s: AVTimer MSW TS did not converge !!!\n", __func__);
- return;
- }
- time_stamp->vt_time.tv_sec = avtimer_msw_1st;
+ } while (avtimer_msw_1st != avtimer_msw_2nd);
+ av_timer_tick = ((uint64_t)avtimer_msw_1st << 32) | avtimer_lsw;
+ avtimer_lsw = do_div(av_timer_tick, USEC_PER_SEC);
+ time_stamp->vt_time.tv_sec = (uint32_t)(av_timer_tick);
time_stamp->vt_time.tv_usec = avtimer_lsw;
}