[1/2] fbdev: pxa3xx: use ktime_get_ts64 for time stamps

Message ID 20171107141319.3390036-1-arnd@arndb.de
State New
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  • [1/2] fbdev: pxa3xx: use ktime_get_ts64 for time stamps
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Commit Message

Arnd Bergmann Nov. 7, 2017, 2:13 p.m.
do_gettimeofday() is deprecated because it is not y2038 safe, so I'm
changing the calculation for the diagnostic output over to using
'timespec64'.

We really only print time deltas here, so changing it to monotonic
time makes this more robust, the correct accessor for this is
ktime_get_ts64().

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

---
 drivers/video/fbdev/pxa3xx-gcu.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

-- 
2.9.0

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Comments

Arnd Bergmann Nov. 8, 2017, 4:27 p.m. | #1
On Tue, Nov 7, 2017 at 3:13 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> do_gettimeofday() is deprecated because it is not y2038 safe, so I'm

> changing the calculation for the diagnostic output over to using

> 'timespec64'.

>

> We really only print time deltas here, so changing it to monotonic

> time makes this more robust, the correct accessor for this is

> ktime_get_ts64().

>

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>


Please ignore this patch, my randconfig builder found a typo that
I had not noticed before.

         Arnd
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Bartlomiej Zolnierkiewicz Jan. 4, 2018, 12:45 p.m. | #2
On Tuesday, November 07, 2017 03:13:06 PM Arnd Bergmann wrote:
> do_gettimeofday() is deprecated and a bit clumsy. This changes

> radeon_probe_pll_params() over to using ktime_get() with monotonic

> times. There is no need to check for negative values any more

> since the monotonic clocksource cannot go backwards, but I'm

> adding a check for zero-division in case of a bad clocksource.

> 

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>


Patch queued for 4.16, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

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Patch

diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c
index 3366076f9e0f..ddca4425adc8 100644
--- a/drivers/video/fbdev/pxa3xx-gcu.c
+++ b/drivers/video/fbdev/pxa3xx-gcu.c
@@ -104,7 +104,7 @@  struct pxa3xx_gcu_priv {
 	wait_queue_head_t	  wait_idle;
 	wait_queue_head_t	  wait_free;
 	spinlock_t		  spinlock;
-	struct timeval 		  base_time;
+	struct timespec64	  base_time;
 
 	struct pxa3xx_gcu_batch *free;
 	struct pxa3xx_gcu_batch *ready;
@@ -126,18 +126,20 @@  gc_writel(struct pxa3xx_gcu_priv *priv, unsigned int off, unsigned long val)
 
 #define QPRINT(priv, level, msg)					\
 	do {								\
-		struct timeval tv;					\
+		struct timespec64 ts;					\
 		struct pxa3xx_gcu_shared *shared = priv->shared;	\
 		u32 base = gc_readl(priv, REG_GCRBBR);			\
 									\
-		do_gettimeofday(&tv);					\
+		ktime_get_ts64(&ts);					\
+		ts = timespec64_sub(ts, priv->base_time);		\
 									\
-		printk(level "%ld.%03ld.%03ld - %-17s: %-21s (%s, "	\
+		printk(level "%lld.%03ld.%03ld - %-17s: %-21s (%s, "	\
 			"STATUS "					\
 			"0x%02lx, B 0x%08lx [%ld], E %5ld, H %5ld, "	\
 			"T %5ld)\n",					\
-			tv.tv_sec - priv->base_time.tv_sec,		\
-			tv.tv_usec / 1000, tv.tv_usec % 1000,		\
+			(s64)(tv.tv_sec),				\
+			tv.tv_usec / NSEC_PER_MSEC,			\
+			(tv.tv_usec % NSEC_PER_MSEC) / USEC_PER_MSEC,	\
 			__func__, msg,					\
 			shared->hw_running ? "running" : "   idle",	\
 			gc_readl(priv, REG_GCISCR),			\
@@ -164,7 +166,7 @@  pxa3xx_gcu_reset(struct pxa3xx_gcu_priv *priv)
 	priv->shared->buffer_phys = priv->shared_phys;
 	priv->shared->magic = PXA3XX_GCU_SHARED_MAGIC;
 
-	do_gettimeofday(&priv->base_time);
+	ktime_get_ts64(&priv->base_time);
 
 	/* set up the ring buffer pointers */
 	gc_writel(priv, REG_GCRBLR, 0);