[media] bt8xxx: Use monotonic time

Wall time obtained from do_gettimeofday is susceptible to sudden jumps due to
user setting the time or due to NTP.

Monotonic time is constantly increasing time better suited for comparing two
timestamps.
Signed-off-by: Abhilash Jindal <klock.android@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/pci/bt8xx/bttv-input.c

@@ -194,21 +194,18 @@ static u32 bttv_rc5_decode(unsigned int code)
 static void bttv_rc5_timer_end(unsigned long data)
 {
 	struct bttv_ir *ir = (struct bttv_ir *)data;
-	struct timeval tv;
+	ktime_t tv;
 	u32 gap, rc5, scancode;
 	u8 toggle, command, system;
 
 	/* get time */
-	do_gettimeofday(&tv);
+	tv = ktime_get();
 
+	gap = ktime_to_us(ktime_sub(tv, ir->base_time));
 	/* avoid overflow with gap >1s */
-	if (tv.tv_sec - ir->base_time.tv_sec > 1) {
+	if (gap > USEC_PER_SEC) {
 		gap = 200000;
-	} else {
-		gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
-		    tv.tv_usec - ir->base_time.tv_usec;
 	}
-
 	/* signal we're ready to start a new code */
 	ir->active = false;
 
@@ -249,7 +246,7 @@ static void bttv_rc5_timer_end(unsigned long data)
 static int bttv_rc5_irq(struct bttv *btv)
 {
 	struct bttv_ir *ir = btv->remote;
-	struct timeval tv;
+	ktime_t tv;
 	u32 gpio;
 	u32 gap;
 	unsigned long current_jiffies;
@@ -259,14 +256,12 @@ static int bttv_rc5_irq(struct bttv *btv)
 
 	/* get time of bit */
 	current_jiffies = jiffies;
-	do_gettimeofday(&tv);
+	tv = ktime_get();
 
+	gap = ktime_to_us(ktime_sub(tv, ir->base_time));
 	/* avoid overflow with gap >1s */
-	if (tv.tv_sec - ir->base_time.tv_sec > 1) {
+	if (gap > USEC_PER_SEC) {
 		gap = 200000;
-	} else {
-		gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
-		    tv.tv_usec - ir->base_time.tv_usec;
 	}
 
 	dprintk("RC5 IRQ: gap %d us for %s\n",

drivers/media/pci/bt8xx/bttvp.h

@@ -140,7 +140,7 @@ struct bttv_ir {
 	bool			rc5_gpio;   /* Is RC5 legacy GPIO enabled? */
 	u32                     last_bit;   /* last raw bit seen */
 	u32                     code;       /* raw code under construction */
-	struct timeval          base_time;  /* time of last seen code */
+	ktime_t          				base_time;  /* time of last seen code */
 	bool                    active;     /* building raw code */
 };