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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
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