linux-kernel - [PATCH] media: uvcvideo: Add boottime clock support

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Message-Id: <20181017075242.21790-1-henryhsu@chromium.org>
Date:   Wed, 17 Oct 2018 15:52:42 +0800
From:   Heng-Ruey Hsu <henryhsu@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        jcliang@...omium.org, tfiga@...omium.org,
        Heng-Ruey Hsu <henryhsu@...omium.org>
Subject: [PATCH] media: uvcvideo: Add boottime clock support

Android requires camera timestamps to be reported with
CLOCK_BOOTTIME to sync timestamp with other sensor sources.

Signed-off-by: Heng-Ruey Hsu <henryhsu@...omium.org>
---
 drivers/media/usb/uvc/uvc_driver.c | 4 ++++
 drivers/media/usb/uvc/uvc_video.c  | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index d46dc432456c..a9658f38c586 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2287,6 +2287,8 @@ static int uvc_clock_param_get(char *buffer, const struct kernel_param *kp)
 {
 	if (uvc_clock_param == CLOCK_MONOTONIC)
 		return sprintf(buffer, "CLOCK_MONOTONIC");
+	else if (uvc_clock_param == CLOCK_BOOTTIME)
+		return sprintf(buffer, "CLOCK_BOOTTIME");
 	else
 		return sprintf(buffer, "CLOCK_REALTIME");
 }
@@ -2298,6 +2300,8 @@ static int uvc_clock_param_set(const char *val, const struct kernel_param *kp)
 
 	if (strcasecmp(val, "monotonic") == 0)
 		uvc_clock_param = CLOCK_MONOTONIC;
+	else if (strcasecmp(val, "boottime") == 0)
+		uvc_clock_param = CLOCK_BOOTTIME;
 	else if (strcasecmp(val, "realtime") == 0)
 		uvc_clock_param = CLOCK_REALTIME;
 	else
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 86a99f461fd8..d4248d5cd9cd 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -425,6 +425,8 @@ static inline ktime_t uvc_video_get_time(void)
 {
 	if (uvc_clock_param == CLOCK_MONOTONIC)
 		return ktime_get();
+	else if (uvc_clock_param == CLOCK_BOOTTIME)
+		return ktime_get_boottime();
 	else
 		return ktime_get_real();
 }
-- 
2.19.1.331.ge82ca0e54c-goog