linux-kernel - [PATCH v2 18/20] mips: csrc-r4k: Decrease r4k-clocksource rating if CPU

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Message-ID: <20200506174238.15385-19-Sergey.Semin@baikalelectronics.ru>
Date:   Wed, 6 May 2020 20:42:36 +0300
From:   <Sergey.Semin@...kalelectronics.ru>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        <linux-mips@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 18/20] mips: csrc-r4k: Decrease r4k-clocksource rating if CPU_FREQ enabled

From: Serge Semin <Sergey.Semin@...kalelectronics.ru>

Commit 07d69579e7fe ("MIPS: Don't register r4k sched clock when
CPUFREQ enabled") disabled the r4k-clock usage for scheduler ticks
counting due to the scheduler being non-tolerant for unstable
clocks sources. For the same reason the clock should be used
in the system clocksource framework only as a last resort if CPU
frequency may change.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Paul Burton <paulburton@...nel.org>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: linux-pm@...r.kernel.org
Cc: devicetree@...r.kernel.org
---
 arch/mips/kernel/csrc-r4k.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/mips/kernel/csrc-r4k.c b/arch/mips/kernel/csrc-r4k.c
index 437dda64fd7a..d81fb374f477 100644
--- a/arch/mips/kernel/csrc-r4k.c
+++ b/arch/mips/kernel/csrc-r4k.c
@@ -71,7 +71,11 @@ int __init init_r4k_clocksource(void)
 		return -ENXIO;
 
 	/* Calculate a somewhat reasonable rating value */
+#ifndef CONFIG_CPU_FREQ
 	clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
+#else
+	clocksource_mips.rating = 99;
+#endif
 
 	/*
 	 * R2 onwards makes the count accessible to user mode so it can be used
-- 
2.25.1