From: fu.wei@linaro.org
To: rjw@rjwysocki.net, lenb@kernel.org, daniel.lezcano@linaro.org,
tglx@linutronix.de, marc.zyngier@arm.com, mark.rutland@arm.com,
lorenzo.pieralisi@arm.com, sudeep.holla@arm.com,
hanjun.guo@linaro.org
Cc: linux-arm-kernel@lists.infradead.org,
linaro-acpi@lists.linaro.org, linux-kernel@vger.kernel.org,
linux-acpi@vger.kernel.org, rruigrok@codeaurora.org,
harba@codeaurora.org, cov@codeaurora.org, timur@codeaurora.org,
graeme.gregory@linaro.org, al.stone@linaro.org, jcm@redhat.com,
wei@redhat.com, arnd@arndb.de, catalin.marinas@arm.com,
will.deacon@arm.com, Suravee.Suthikulpanit@amd.com,
leo.duran@amd.com, wim@iguana.be, linux@roeck-us.net,
linux-watchdog@vger.kernel.org, tn@semihalf.com,
christoffer.dall@linaro.org, julien.grall@arm.com,
Fu Wei <fu.wei@linaro.org>
Subject: [PATCH v24 02/11] clocksource: arm_arch_timer: refactor arch_timer_needs_probing
Date: Sat, 15 Apr 2017 02:40:05 +0800 [thread overview]
Message-ID: <20170414184014.8524-3-fu.wei@linaro.org> (raw)
In-Reply-To: <20170414184014.8524-1-fu.wei@linaro.org>
From: Fu Wei <fu.wei@linaro.org>
When booting with DT, it's possible for timer nodes to be probed in any
order. Some common initialisation needs to occur after all nodes have
been probed, and arch_timer_common_init() has code to detect when this
has happened.
This logic is DT-specific, and it would be best to factor it out of the
common code that will be shared with ACPI.
This patch folds this into the existing arch_timer_needs_probing(),
which is renamed to arch_timer_needs_of_probing(), and no longer takes
any arguments. This is only called when using DT, and not when using
ACPI, which will have a deterministic probe order.
Signed-off-by: Fu Wei <fu.wei@linaro.org>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
[Mark: reword commit message]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
---
drivers/clocksource/arm_arch_timer.c | 34 +++++++++++++++++++---------------
1 file changed, 19 insertions(+), 15 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 0138b0c..03d71d6 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -1076,15 +1076,28 @@ static const struct of_device_id arch_timer_mem_of_match[] __initconst = {
{},
};
-static bool __init
-arch_timer_needs_probing(int type, const struct of_device_id *matches)
+static bool __init arch_timer_needs_of_probing(void)
{
struct device_node *dn;
bool needs_probing = false;
+ unsigned int mask = ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM;
- dn = of_find_matching_node(NULL, matches);
- if (dn && of_device_is_available(dn) && !(arch_timers_present & type))
+ /* We have two timers, and both device-tree nodes are probed. */
+ if ((arch_timers_present & mask) == mask)
+ return false;
+
+ /*
+ * Only one type of timer is probed,
+ * check if we have another type of timer node in device-tree.
+ */
+ if (arch_timers_present & ARCH_TIMER_TYPE_CP15)
+ dn = of_find_matching_node(NULL, arch_timer_mem_of_match);
+ else
+ dn = of_find_matching_node(NULL, arch_timer_of_match);
+
+ if (dn && of_device_is_available(dn))
needs_probing = true;
+
of_node_put(dn);
return needs_probing;
@@ -1092,17 +1105,8 @@ arch_timer_needs_probing(int type, const struct of_device_id *matches)
static int __init arch_timer_common_init(void)
{
- unsigned mask = ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM;
-
- /* Wait until both nodes are probed if we have two timers */
- if ((arch_timers_present & mask) != mask) {
- if (arch_timer_needs_probing(ARCH_TIMER_TYPE_MEM,
- arch_timer_mem_of_match))
- return 0;
- if (arch_timer_needs_probing(ARCH_TIMER_TYPE_CP15,
- arch_timer_of_match))
- return 0;
- }
+ if (acpi_disabled && arch_timer_needs_of_probing())
+ return 0;
arch_timer_banner(arch_timers_present);
arch_counter_register(arch_timers_present);
--
2.9.3
next prev parent reply other threads:[~2017-04-14 18:41 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-14 18:40 [PATCH v24 00/11] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer fu.wei
2017-04-14 18:40 ` [PATCH v24 01/11] clocksource: arm_arch_timer: split dt-only rate handling fu.wei
2017-04-14 18:40 ` fu.wei [this message]
2017-04-14 18:40 ` [PATCH v24 03/11] clocksource: arm_arch_timer: move arch_timer_needs_of_probing into DT init call fu.wei
2017-04-14 18:40 ` [PATCH v24 04/11] clocksource: arm_arch_timer: add structs to describe MMIO timer fu.wei
2017-04-14 18:40 ` [PATCH v24 05/11] clocksource: arm_arch_timer: split MMIO timer probing fu.wei
2017-04-14 18:40 ` [PATCH v24 06/11] acpi/arm64: Add GTDT table parse driver fu.wei
2017-04-14 18:40 ` [PATCH v24 07/11] clocksource: arm_arch_timer: simplify ACPI support code fu.wei
2017-04-14 18:40 ` [PATCH v24 08/11] acpi: Introduce acpi_unregister_irq function fu.wei
2017-04-18 15:58 ` Mark Rutland
2017-04-19 15:09 ` Mark Rutland
2017-04-14 18:40 ` [PATCH v24 09/11] acpi/arm64: Add memory-mapped timer support in GTDT driver fu.wei
2017-04-18 17:21 ` Lorenzo Pieralisi
2017-04-19 15:07 ` Mark Rutland
2017-04-19 15:45 ` Mark Rutland
2017-04-19 15:56 ` Lorenzo Pieralisi
2017-04-14 18:40 ` [PATCH v24 10/11] clocksource: arm_arch_timer: add GTDT support for memory-mapped timer fu.wei
2017-04-14 18:40 ` [PATCH v24 11/11] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver fu.wei
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