linux-kernel - [PATCH 2/2] arm: zynq: don't disable CONFIG_ARM_GLOBAL_TIMER due to CONFIG_CPU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Wed, 17 Feb 2021 12:07:09 +0100
From:   Andrea Merello <andrea.merello@...il.com>
To:     tglx@...utronix.de, daniel.lezcano@...aro.org
Cc:     Andrea Merello <andrea.merello@...il.com>,
        Patrice Chotard <patrice.chotard@...com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Michal Simek <michal.simek@...inx.com>,
        Sören Brinkmann <soren.brinkmann@...inx.com>
Subject: [PATCH 2/2] arm: zynq: don't disable CONFIG_ARM_GLOBAL_TIMER due to CONFIG_CPU_FREQ anymore

Now ARM global timer driver could work even if it's source clock rate
changes, so we don't need to disable that driver when cpu frequency scaling
is in use.

This cause Zynq arch to get support for timer delay and get_cycles().

Signed-off-by: Andrea Merello <andrea.merello@...il.com>
Cc: Patrice Chotard <patrice.chotard@...com>
Cc: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: Michal Simek <michal.simek@...inx.com>
Cc: Sören Brinkmann <soren.brinkmann@...inx.com>
---
 arch/arm/mach-zynq/Kconfig  | 2 +-
 drivers/clocksource/Kconfig | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 43fb941dcd07..a56748d671c4 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -6,7 +6,7 @@ config ARCH_ZYNQ
 	select ARCH_SUPPORTS_BIG_ENDIAN
 	select ARM_AMBA
 	select ARM_GIC
-	select ARM_GLOBAL_TIMER if !CPU_FREQ
+	select ARM_GLOBAL_TIMER
 	select CADENCE_TTC_TIMER
 	select HAVE_ARM_SCU if SMP
 	select HAVE_ARM_TWD if SMP
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 0f1c625275a0..421cd763bdb2 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -387,6 +387,7 @@ config ARM_GLOBAL_TIMER
 
 config ARM_GT_INITIAL_PRESCALER_VAL
 	int "ARM global timer initial prescaler value"
+	default 2 if ARCH_ZYNQ
 	default 1
 	depends on ARM_GLOBAL_TIMER
 	help
-- 
2.17.1