From: Abhilash Jindal <klock.android@gmail.com>
To: linux-media@vger.kernel.org
Cc: mchehab@osg.samsung.com, Abhilash Jindal <klock.android@gmail.com>
Subject: [PATCH] [media] dvb-frontend: Use boottime
Date: Sun, 31 Jan 2016 00:47:31 -0500 [thread overview]
Message-ID: <1454219251-21760-1-git-send-email-klock.android@gmail.com> (raw)
Wall time obtained from ktime_get_real is susceptible to sudden jumps due to
user setting the time or due to NTP. Boot time is constantly increasing time
better suited for comparing two timestamps.
Signed-off-by: Abhilash Jindal <klock.android@gmail.com>
---
drivers/media/dvb-core/dvb_frontend.c | 8 ++++----
drivers/media/dvb-frontends/stv0299.c | 4 ++--
2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index c38ef1a..8058df9 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -901,10 +901,10 @@ void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
s32 delta, newdelta;
ktime_add_us(*waketime, add_usec);
- delta = ktime_us_delta(ktime_get_real(), *waketime);
+ delta = ktime_us_delta(ktime_get_boottime(), *waketime);
if (delta > 2500) {
msleep((delta - 1500) / 1000);
- newdelta = ktime_us_delta(ktime_get_real(), *waketime);
+ newdelta = ktime_us_delta(ktime_get_boottime(), *waketime);
delta = (newdelta > delta) ? 0 : newdelta;
}
if (delta > 0)
@@ -2454,7 +2454,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
u8 last = 1;
if (dvb_frontend_debug)
printk("%s switch command: 0x%04lx\n", __func__, swcmd);
- nexttime = ktime_get_real();
+ nexttime = ktime_get_boottime();
if (dvb_frontend_debug)
tv[0] = nexttime;
/* before sending a command, initialize by sending
@@ -2465,7 +2465,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
for (i = 0; i < 9; i++) {
if (dvb_frontend_debug)
- tv[i+1] = ktime_get_real();
+ tv[i+1] = ktime_get_boottime();
if ((swcmd & 0x01) != last) {
/* set voltage to (last ? 13V : 18V) */
fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
diff --git a/drivers/media/dvb-frontends/stv0299.c b/drivers/media/dvb-frontends/stv0299.c
index a817780..c43f36d 100644
--- a/drivers/media/dvb-frontends/stv0299.c
+++ b/drivers/media/dvb-frontends/stv0299.c
@@ -422,7 +422,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long
if (debug_legacy_dish_switch)
printk ("%s switch command: 0x%04lx\n",__func__, cmd);
- nexttime = ktime_get_real();
+ nexttime = ktime_get_boottime();
if (debug_legacy_dish_switch)
tv[0] = nexttime;
stv0299_writeregI (state, 0x0c, reg0x0c | 0x50); /* set LNB to 18V */
@@ -431,7 +431,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long
for (i=0; i<9; i++) {
if (debug_legacy_dish_switch)
- tv[i+1] = ktime_get_real();
+ tv[i+1] = ktime_get_boottime();
if((cmd & 0x01) != last) {
/* set voltage to (last ? 13V : 18V) */
stv0299_writeregI (state, 0x0c, reg0x0c | (last ? lv_mask : 0x50));
--
1.7.9.5
reply other threads:[~2016-01-31 5:47 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1454219251-21760-1-git-send-email-klock.android@gmail.com \
--to=klock.android@gmail.com \
--cc=linux-media@vger.kernel.org \
--cc=mchehab@osg.samsung.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.