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-rw-r--r--target/linux/mediatek/patches/0040-clocksource-mediatek-Use-GPT-as-sched-clock-source.patch51
1 files changed, 51 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches/0040-clocksource-mediatek-Use-GPT-as-sched-clock-source.patch b/target/linux/mediatek/patches/0040-clocksource-mediatek-Use-GPT-as-sched-clock-source.patch
new file mode 100644
index 0000000000..c6b66afc05
--- /dev/null
+++ b/target/linux/mediatek/patches/0040-clocksource-mediatek-Use-GPT-as-sched-clock-source.patch
@@ -0,0 +1,51 @@
+From 3b3c2406dd9797bc806e0ce756142a33d209c4e8 Mon Sep 17 00:00:00 2001
+From: "Joe.C" <yingjoe.chen@mediatek.com>
+Date: Fri, 1 May 2015 15:43:25 +0800
+Subject: [PATCH 40/76] clocksource: mediatek: Use GPT as sched clock source
+
+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>
+---
+ 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 85e0ab5..9a90c7b 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_base __read_mostly;
++
++static u64 notrace mtk_read_sched_clock(void)
++{
++ return readl_relaxed(gpt_base + TIMER_CNT_REG(GPT_CLK_SRC));
++}
++
+ static inline struct mtk_clock_event_device *to_mtk_clk(
+ struct clock_event_device *c)
+ {
+@@ -239,6 +247,8 @@ 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_base = evt->gpt_base;
++ sched_clock_register(mtk_read_sched_clock, 32, rate);
+
+ /* Configure clock event */
+ mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT);
+--
+1.7.10.4
+