* [PATCH] platform: chrome: Fix EC timestamp overflow
@ 2020-06-30 7:52 Gwendal Grignou
2020-07-01 9:11 ` Enric Balletbo i Serra
0 siblings, 1 reply; 2+ messages in thread
From: Gwendal Grignou @ 2020-06-30 7:52 UTC (permalink / raw)
To: bleung, enric.balletbo, bhanumaiya; +Cc: groeck, linux-kernel, Gwendal Grignou
EC is using 32 bit timestamps (us), and before converting it to 64bit
they were not casted, so it would overflow every 4s.
Regular overflow every ~70 minutes was not taken into acoun either.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
drivers/platform/chrome/cros_ec_sensorhub_ring.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/platform/chrome/cros_ec_sensorhub_ring.c b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
index 23960f3acc0b1..641d91088cee2 100644
--- a/drivers/platform/chrome/cros_ec_sensorhub_ring.c
+++ b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
@@ -465,9 +465,7 @@ cros_ec_sensor_ring_process_event(struct cros_ec_sensorhub *sensorhub,
* Disable filtering since we might add more jitter
* if b is in a random point in time.
*/
- new_timestamp = fifo_timestamp -
- fifo_info->timestamp * 1000 +
- in->timestamp * 1000;
+ new_timestamp = c - b * 1000 + a * 1000;
/*
* The timestamp can be stale if we had to use the fifo
* info timestamp.
--
2.27.0.212.ge8ba1cc988-goog
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] platform: chrome: Fix EC timestamp overflow
2020-06-30 7:52 [PATCH] platform: chrome: Fix EC timestamp overflow Gwendal Grignou
@ 2020-07-01 9:11 ` Enric Balletbo i Serra
0 siblings, 0 replies; 2+ messages in thread
From: Enric Balletbo i Serra @ 2020-07-01 9:11 UTC (permalink / raw)
To: Gwendal Grignou, bleung, bhanumaiya; +Cc: groeck, linux-kernel
Hi Gwendal,
Thank you for your patch.
On 30/6/20 9:52, Gwendal Grignou wrote:
> EC is using 32 bit timestamps (us), and before converting it to 64bit
> they were not casted, so it would overflow every 4s.
> Regular overflow every ~70 minutes was not taken into acoun either.
>
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Applied for 5.9 with a slightly modified subject, platform/chrome:
cros_ec_sensorhub: ...
> ---
> drivers/platform/chrome/cros_ec_sensorhub_ring.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_sensorhub_ring.c b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
> index 23960f3acc0b1..641d91088cee2 100644
> --- a/drivers/platform/chrome/cros_ec_sensorhub_ring.c
> +++ b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
> @@ -465,9 +465,7 @@ cros_ec_sensor_ring_process_event(struct cros_ec_sensorhub *sensorhub,
> * Disable filtering since we might add more jitter
> * if b is in a random point in time.
> */
> - new_timestamp = fifo_timestamp -
> - fifo_info->timestamp * 1000 +
> - in->timestamp * 1000;
> + new_timestamp = c - b * 1000 + a * 1000;
> /*
> * The timestamp can be stale if we had to use the fifo
> * info timestamp.
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-06-30 7:52 [PATCH] platform: chrome: Fix EC timestamp overflow Gwendal Grignou
2020-07-01 9:11 ` Enric Balletbo i Serra
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