From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Date: Tue, 07 Nov 2017 14:13:06 +0000 Subject: [PATCH 2/2] fbdev: radeon: stop use ktime_get() for HZ calibration Message-Id: <20171107141319.3390036-2-arnd@arndb.de> List-Id: References: <20171107141319.3390036-1-arnd@arndb.de> In-Reply-To: <20171107141319.3390036-1-arnd@arndb.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Benjamin Herrenschmidt , Bartlomiej Zolnierkiewicz Cc: Colin Ian King , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Arnd Bergmann , linux-kernel@vger.kernel.org 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 --- drivers/video/fbdev/aty/radeon_base.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/drivers/video/fbdev/aty/radeon_base.c b/drivers/video/fbdev/aty/radeon_base.c index 8ad1643e7d1c..8b7048fbf6dc 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); -- 2.9.0