Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751248AbbLTW35 (ORCPT ); Sun, 20 Dec 2015 17:29:57 -0500 Received: from fallback6.mail.ru ([94.100.181.147]:38889 "EHLO fallback6.mail.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751071AbbLTW3t (ORCPT ); Sun, 20 Dec 2015 17:29:49 -0500 From: Roman Volkov To: Tony Prisk Cc: Daniel Lezcano , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Roman Volkov Subject: [PATCH 2/4] clocksource/vt8500: Remove the 'loops' variable Date: Mon, 21 Dec 2015 01:28:10 +0300 Message-Id: <1450650492-18996-3-git-send-email-v1ron@mail.ru> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1450650492-18996-1-git-send-email-v1ron@mail.ru> References: <1450650492-18996-1-git-send-email-v1ron@mail.ru> X-Mras: Ok Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2173 Lines: 58 From: Roman Volkov The purpose of the 'loops' variable is unclear. vt8500 hardware does not require any protections, in case if these variables intended for preventing infinite loops (identical PXA timer works perfectly without these ones). If the loops count will not be calculated correctly, these variables will only break the loop too early and introduce problems. Signed-off-by: Roman Volkov --- drivers/clocksource/vt8500_timer.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/clocksource/vt8500_timer.c b/drivers/clocksource/vt8500_timer.c index 13ed892..f40ded8 100644 --- a/drivers/clocksource/vt8500_timer.c +++ b/drivers/clocksource/vt8500_timer.c @@ -48,8 +48,6 @@ #define TIMER_COUNT_W_ACTIVE (1 << 4) /* not ready for write */ #define TIMER_MATCH_W_ACTIVE (1 << 0) /* not ready for write */ -#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) - #define timer_readl(addr) readl_relaxed(regbase + addr) #define timer_writel(v, addr) writel_relaxed(v, regbase + addr) @@ -57,10 +55,10 @@ static void __iomem *regbase; static cycle_t vt8500_timer_read(struct clocksource *cs) { - int loops = msecs_to_loops(10); timer_writel(3, TIMER_CTRL_VAL); - while ((timer_readl((TIMER_AS_VAL)) & TIMER_COUNT_R_ACTIVE) && --loops) + while (timer_readl(TIMER_AS_VAL) & TIMER_COUNT_R_ACTIVE) cpu_relax(); + return timer_readl(TIMER_COUNT_VAL); } @@ -75,9 +73,8 @@ static struct clocksource clocksource = { static int vt8500_timer_set_next_event(unsigned long cycles, struct clock_event_device *evt) { - int loops = msecs_to_loops(10); cycle_t alarm = clocksource.read(&clocksource) + cycles; - while ((timer_readl(TIMER_AS_VAL) & TIMER_MATCH_W_ACTIVE) && --loops) + while (timer_readl(TIMER_AS_VAL) & TIMER_MATCH_W_ACTIVE) cpu_relax(); timer_writel((unsigned long)alarm, TIMER_MATCH_VAL); -- 2.6.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/