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Groups > linux.kernel > #1251074

[PATCH 2/9] clocksource/drivers/mediatek: Use GPT as sched clock source

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From: Yingjoe Chen <yingjoe.chen@mediatek.com>

When cpu is in deep idle, arch timer will stop counting. Setup GPT as
sched clock source so it can keep counting in idle.

Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Matthias Brugger <matthias.bgg@gmail.com>
---
 drivers/clocksource/mtk_timer.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c
index c8badc4..fbfc746 100644
--- a/drivers/clocksource/mtk_timer.c
+++ b/drivers/clocksource/mtk_timer.c
@@ -24,6 +24,7 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
+#include <linux/sched_clock.h>
 #include <linux/slab.h>
 
 #define GPT_IRQ_EN_REG		0x00
@@ -59,6 +60,13 @@ struct mtk_clock_event_device {
 	struct clock_event_device dev;
 };
 
+static void __iomem *gpt_sched_reg __read_mostly;
+
+static u64 notrace mtk_read_sched_clock(void)
+{
+	return readl_relaxed(gpt_sched_reg);
+}
+
 static inline struct mtk_clock_event_device *to_mtk_clk(
 				struct clock_event_device *c)
 {
@@ -230,6 +238,8 @@ static void __init mtk_timer_init(struct device_node *node)
 	mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN);
 	clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC),
 			node->name, rate, 300, 32, clocksource_mmio_readl_up);
+	gpt_sched_reg = evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC);
+	sched_clock_register(mtk_read_sched_clock, 32, rate);
 
 	/* Configure clock event */
 	mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT);
-- 
1.9.1

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Thread

[PULL] : clockevents for 4.4 Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:00 +0200
  [PATCH 2/9] clocksource/drivers/mediatek: Use GPT as sched clock source Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
  [PATCH 1/9] clockevents/drivers/mtk: Fix spurious interrupt leading to crash Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
    [PATCH 8/9] clocksource/drivers/tango_xtal: Add new timer for Tango SoCs Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
    [PATCH 4/9] clocksource/drivers/sh_cmt: Remove unneeded memset() in sh_cmt_setup() Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
    [PATCH 7/9] clocksource/drivers/imx: Allow timer irq affinity change Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
    [PATCH 5/9] clocksource/drivers/h8300_*: Remove unneeded memset()s Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
      Re: [PATCH 5/9] clocksource/drivers/h8300_*: Remove unneeded memset()s Yoshinori Sato <ysato@users.sourceforge.jp> - 2015-10-20 06:50 +0200
    [PATCH 6/9] clocksource/drivers/exynos_mct: Use container_of() instead of this_cpu_ptr() Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
    [PATCH 9/9] clocksource/drivers/armada-370-xp: Implement ARM delay timer Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
    [PATCH 3/9] clocksource/drivers/em_sti: Remove unneeded memset()s Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-19 23:10 +0200
    Re: [PATCH 1/9] clockevents/drivers/mtk: Fix spurious interrupt  leading to crash Matthias Brugger <matthias.bgg@gmail.com> - 2015-10-22 22:00 +0200

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