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authorArnd Bergmann <arnd@arndb.de>2018-01-04 16:53:49 +0100
committerBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2018-01-04 16:53:49 +0100
commit63a4be93937c1a6459f9d67b7afeb4e81fa64d2b (patch)
tree4aeadafeaa7fdfd3c837c37335004d9c92bf0c94 /drivers/video
parentdefddeff61041dbe2d5bd5469ee48912a89b4118 (diff)
downloadlinux-63a4be93937c1a6459f9d67b7afeb4e81fa64d2b.tar.bz2
fbdev: radeon: use ktime_get() for HZ calibration
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> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Colin Ian King <colin.king@canonical.com> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fbdev/aty/radeon_base.c18
1 files changed, 7 insertions, 11 deletions
diff --git a/drivers/video/fbdev/aty/radeon_base.c b/drivers/video/fbdev/aty/radeon_base.c
index 4d77daeecf99..87608c0b2351 100644
--- a/drivers/video/fbdev/aty/radeon_base.c
+++ b/drivers/video/fbdev/aty/radeon_base.c
@@ -583,8 +583,8 @@ static int radeon_probe_pll_params(struct radeonfb_info *rinfo)
int hTotal, vTotal, num, denom, m, n;
unsigned long long hz, vclk;
long xtal;
- struct timeval start_tv, stop_tv;
- long total_secs, total_usecs;
+ ktime_t start_time, stop_time;
+ u64 total_usecs;
int i;
/* Ugh, we cut interrupts, bad bad bad, but we want some precision
@@ -600,7 +600,7 @@ static int radeon_probe_pll_params(struct radeonfb_info *rinfo)
if (((INREG(CRTC_VLINE_CRNT_VLINE) >> 16) & 0x3ff) == 0)
break;
- do_gettimeofday(&start_tv);
+ start_time = ktime_get();
for(i=0; i<1000000; i++)
if (((INREG(CRTC_VLINE_CRNT_VLINE) >> 16) & 0x3ff) != 0)
@@ -610,18 +610,14 @@ static int radeon_probe_pll_params(struct radeonfb_info *rinfo)
if (((INREG(CRTC_VLINE_CRNT_VLINE) >> 16) & 0x3ff) == 0)
break;
- do_gettimeofday(&stop_tv);
+ stop_time = ktime_get();
local_irq_enable();
- total_secs = stop_tv.tv_sec - start_tv.tv_sec;
- if (total_secs > 10)
+ total_usecs = ktime_us_delta(stop_time, start_time);
+ if (total_usecs >= 10 * USEC_PER_SEC || total_usecs == 0)
return -1;
- total_usecs = stop_tv.tv_usec - start_tv.tv_usec;
- total_usecs += total_secs * 1000000;
- if (total_usecs < 0)
- total_usecs = -total_usecs;
- hz = 1000000/total_usecs;
+ hz = USEC_PER_SEC/(u32)total_usecs;
hTotal = ((INREG(CRTC_H_TOTAL_DISP) & 0x1ff) + 1) * 8;
vTotal = ((INREG(CRTC_V_TOTAL_DISP) & 0x3ff) + 1);