linux-kernel - [PATCH v20 08/17] clocksource/drivers/arm_arch_timer: Rework counter frequency detection.

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Date:   Wed, 18 Jan 2017 21:25:32 +0800
From:   fu.wei@...aro.org
To:     rjw@...ysocki.net, lenb@...nel.org, daniel.lezcano@...aro.org,
        tglx@...utronix.de, marc.zyngier@....com, mark.rutland@....com,
        lorenzo.pieralisi@....com, sudeep.holla@....com,
        hanjun.guo@...aro.org
Cc:     linux-arm-kernel@...ts.infradead.org, linaro-acpi@...ts.linaro.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        rruigrok@...eaurora.org, harba@...eaurora.org, cov@...eaurora.org,
        timur@...eaurora.org, graeme.gregory@...aro.org,
        al.stone@...aro.org, jcm@...hat.com, wei@...hat.com, arnd@...db.de,
        catalin.marinas@....com, will.deacon@....com,
        Suravee.Suthikulpanit@....com, leo.duran@....com, wim@...ana.be,
        linux@...ck-us.net, linux-watchdog@...r.kernel.org,
        tn@...ihalf.com, christoffer.dall@...aro.org, julien.grall@....com,
        Fu Wei <fu.wei@...aro.org>
Subject: [PATCH v20 08/17] clocksource/drivers/arm_arch_timer: Rework counter frequency detection.

From: Fu Wei <fu.wei@...aro.org>

The counter frequency detection call(arch_timer_detect_rate) combines two
ways to get counter frequency: system coprocessor register and MMIO timer.
But in a specific timer init code, we only need one way to try:
getting frequency from MMIO timer register will be needed only when we
init MMIO timer; getting frequency from system coprocessor register will
be needed only when we init arch timer.

This patch separates paths to determine frequency:
Separate out the MMIO frequency and the sysreg frequency detection call,
and use the appropriate one for the counter.

Signed-off-by: Fu Wei <fu.wei@...aro.org>
---
 drivers/clocksource/arm_arch_timer.c | 40 ++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 15 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 6484f84..9482481 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -488,23 +488,33 @@ static int arch_timer_starting_cpu(unsigned int cpu)
 	return 0;
 }
 
-static void arch_timer_detect_rate(void __iomem *cntbase)
+static void __arch_timer_determine_rate(u32 rate)
 {
-	/* Who has more than one independent system counter? */
-	if (arch_timer_rate)
-		return;
+	/* Check the timer frequency. */
+	if (!arch_timer_rate) {
+		if (rate)
+			arch_timer_rate = rate;
+		else
+			pr_warn("frequency not available\n");
+	} else if (rate && arch_timer_rate != rate) {
+		pr_warn("got different frequency, keep original.\n");
+	}
+}
 
+static void arch_timer_detect_rate(void)
+{
 	/*
-	 * Try to determine the frequency from the MMIO timer or the sysreg.
+	 * Try to get the timer frequency from the sysreg CNTFRQ.
 	 */
-	if (cntbase)
-		arch_timer_rate = readl_relaxed(cntbase + CNTFRQ);
-	else
-		arch_timer_rate = arch_timer_get_cntfrq();
+	__arch_timer_determine_rate(arch_timer_get_cntfrq());
+}
 
-	/* Check the timer frequency. */
-	if (arch_timer_rate == 0)
-		pr_warn("frequency not available\n");
+static void arch_timer_mem_detect_rate(void __iomem *cntbase)
+{
+	/*
+	 * Try to get the timer frequency from the CNTFRQ reg of MMIO timer.
+	 */
+	__arch_timer_determine_rate(readl_relaxed(cntbase + CNTFRQ));
 }
 
 static void arch_timer_banner(unsigned type)
@@ -887,7 +897,7 @@ static int __init arch_timer_of_init(struct device_node *np)
 	 */
 	if (!arch_timer_rate &&
 	    of_property_read_u32(np, "clock-frequency", &arch_timer_rate))
-		arch_timer_detect_rate(NULL);
+		arch_timer_detect_rate();
 
 	arch_timer_c3stop = !of_property_read_bool(np, "always-on");
 
@@ -1001,7 +1011,7 @@ static int __init arch_timer_mem_init(struct device_node *np)
 	 */
 	if (!arch_timer_rate &&
 	    of_property_read_u32(np, "clock-frequency", &arch_timer_rate))
-		arch_timer_detect_rate(base);
+		arch_timer_mem_detect_rate(base);
 
 	ret = arch_timer_mem_register(base, irq);
 	if (ret)
@@ -1064,7 +1074,7 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
 		gtdt->non_secure_el2_flags);
 
 	/* Get the frequency from the sysreg CNTFRQ */
-	arch_timer_detect_rate(NULL);
+	arch_timer_detect_rate();
 
 	arch_timer_uses_ppi = arch_timer_select_ppi();
 	if (!arch_timer_ppi[arch_timer_uses_ppi]) {
-- 
2.9.3