LinuxLists.cc - [PATCHv2 00/11] Implement clocksource for rockchip SoC using rockchip timer

2016-11-28 14:31:40

Subject: [PATCHv2 00/11] Implement clocksource for rockchip SoC using rockchip timer

Hello,

This patch series contain:
- devicetree bindings clarification for rockchip timers
- dts files fixes for rk3228-evb, rk3229-evb and rk3188
- implementation of clocksource for rockchip SoC

The clock supplying the arm-global-timer on the rk3188 is coming from the
the cpu clock itself and thus changes its rate everytime cpufreq adjusts
the cpu frequency making this timer unsuitable as a stable clocksource.

The rk3188, rk3288 and following socs share a separate timer block already
handled by the rockchip-timer driver. Therefore adapt this driver to also
be able to act as clocksource on rk3188.

In order to test clocksource you can run following commands and check
how much time it take in real. On rk3188 it take about ~45 seconds.
Such error cannot be fixed using NTP. Haven't test clocksource
on rk3288 and onwards. Guess they can also have unstable clocksource.

cpufreq-set -f 1.6GHZ
date; sleep 60; date

Regards,
Alexander.

This is try 2. Please discard all previous patches:

devicetree:
https://patchwork.ozlabs.org/patch/699019/
https://patchwork.ozlabs.org/patch/699020/

kernel:
https://patchwork.kernel.org/patch/9443975/
https://patchwork.kernel.org/patch/9443971/
https://patchwork.kernel.org/patch/9443959/
https://patchwork.kernel.org/patch/9443963/
https://patchwork.kernel.org/patch/9443979/
https://patchwork.kernel.org/patch/9443989/
https://patchwork.kernel.org/patch/9443987/
https://patchwork.kernel.org/patch/9443977/
https://patchwork.kernel.org/patch/9443991/

Old thread:
http://lists.infradead.org/pipermail/linux-rockchip/2016-November/013147.html

Alexander Kochetkov (11):
dt-bindings: clarify compatible property for rockchip timers
ARM: dts: rockchip: update compatible property for rk3228 timer
ARM: dts: rockchip: update compatible property for rk3229 timer
ARM: dts: rockchip: add timer entries to rk3188 dtsi
clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and
rk_clock_event_device
clocksource/drivers/rockchip_timer: low level routines take rk_timer
as parameter
clocksource/drivers/rockchip_timer: drop unused rk_base() and
rk_ctrl()
clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of
rk_timer_enable()
clocksource/drivers/rockchip_timer: implement loading 64bit value
into timer
clocksource/drivers/rockchip_timer: implement reading 64bit value
from timer
clocksource/drivers/rockchip_timer: implement clocksource timer

.../bindings/timer/rockchip,rk-timer.txt | 12 +-
arch/arm/boot/dts/rk3188.dtsi | 16 ++
arch/arm/boot/dts/rk3228-evb.dts | 4 +
arch/arm/boot/dts/rk3229-evb.dts | 4 +
drivers/clocksource/rockchip_timer.c | 202 +++++++++++++++-----
5 files changed, 184 insertions(+), 54 deletions(-)

--
1.7.9.5

2016-11-28 14:31:48

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 05/11] clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and rk_clock_event_device

The patch move ce field out of struct bc_timer into struct
rk_clock_event_device and rename struct bc_timer to struct rk_timer.

This is refactoring step without functional changes.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 33 ++++++++++++++++++++++-----------
1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 23e267a..6d68d4c 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -29,18 +29,28 @@
#define TIMER_MODE_USER_DEFINED_COUNT (1 << 1)
#define TIMER_INT_UNMASK (1 << 2)

-struct bc_timer {
- struct clock_event_device ce;
+struct rk_timer {
void __iomem *base;
void __iomem *ctrl;
u32 freq;
};

-static struct bc_timer bc_timer;
+struct rk_clock_event_device {
+ struct clock_event_device ce;
+ struct rk_timer timer;
+};
+
+static struct rk_clock_event_device bc_timer;
+
+static inline struct rk_clock_event_device*
+rk_clock_event_device(struct clock_event_device *ce)
+{
+ return container_of(ce, struct rk_clock_event_device, ce);
+}

-static inline struct bc_timer *rk_timer(struct clock_event_device *ce)
+static inline struct rk_timer *rk_timer(struct clock_event_device *ce)
{
- return container_of(ce, struct bc_timer, ce);
+ return &rk_clock_event_device(ce)->timer;
}

static inline void __iomem *rk_base(struct clock_event_device *ce)
@@ -116,16 +126,17 @@ static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
{
struct clock_event_device *ce = &bc_timer.ce;
+ struct rk_timer *timer = &bc_timer.timer;
struct clk *timer_clk;
struct clk *pclk;
int ret = -EINVAL, irq;

- bc_timer.base = of_iomap(np, 0);
- if (!bc_timer.base) {
+ timer->base = of_iomap(np, 0);
+ if (!timer->base) {
pr_err("Failed to get base address for '%s'\n", TIMER_NAME);
return -ENXIO;
}
- bc_timer.ctrl = bc_timer.base + ctrl_reg;
+ timer->ctrl = timer->base + ctrl_reg;

pclk = of_clk_get_by_name(np, "pclk");
if (IS_ERR(pclk)) {
@@ -153,7 +164,7 @@ static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
goto out_timer_clk;
}

- bc_timer.freq = clk_get_rate(timer_clk);
+ timer->freq = clk_get_rate(timer_clk);

irq = irq_of_parse_and_map(np, 0);
if (!irq) {
@@ -181,7 +192,7 @@ static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
goto out_irq;
}

- clockevents_config_and_register(ce, bc_timer.freq, 1, UINT_MAX);
+ clockevents_config_and_register(ce, timer->freq, 1, UINT_MAX);

return 0;

@@ -190,7 +201,7 @@ out_irq:
out_timer_clk:
clk_disable_unprepare(pclk);
out_unmap:
- iounmap(bc_timer.base);
+ iounmap(timer->base);

return ret;
}
--
1.7.9.5

2016-11-28 14:31:53

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 04/11] ARM: dts: rockchip: add timer entries to rk3188 dtsi

The patch add two timers to all rk3188 based boards.

The first timer is from alive subsystem and it act as a backup
for the local timers at sleep time. It act the same as timers
on other rockchip chips already present in kernel.

The second timer is from CPU subsystem and act as replacement
for the arm-global-timer clocksource. It run as stable frequency
24MHz.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
arch/arm/boot/dts/rk3188.dtsi | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index 31f81b2..0dc52fe 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -106,6 +106,22 @@
};
};

+ timer3: timer@2000e000 {
+ compatible = "rockchip,rk3188-timer", "rockchip,rk3288-timer";
+ reg = <0x2000e000 0x20>;
+ interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&cru SCLK_TIMER3>, <&cru PCLK_TIMER3>;
+ clock-names = "timer", "pclk";
+ };
+
+ timer6: timer@200380a0 {
+ compatible = "rockchip,rk3188-timer", "rockchip,rk3288-timer";
+ reg = <0x200380a0 0x20>;
+ interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&cru SCLK_TIMER6>, <&cru PCLK_TIMER0>;
+ clock-names = "timer", "pclk";
+ };
+
i2s0: i2s@1011a000 {
compatible = "rockchip,rk3188-i2s", "rockchip,rk3066-i2s";
reg = <0x1011a000 0x2000>;
--
1.7.9.5

2016-11-28 14:32:02

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 03/11] ARM: dts: rockchip: update compatible property for rk3229 timer

Property set to '"rockchip,rk3229-timer", "rockchip,rk3288-timer"'
to match devicetree bindings.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
arch/arm/boot/dts/rk3229-evb.dts | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/rk3229-evb.dts b/arch/arm/boot/dts/rk3229-evb.dts
index b6a1203..6629769 100644
--- a/arch/arm/boot/dts/rk3229-evb.dts
+++ b/arch/arm/boot/dts/rk3229-evb.dts
@@ -88,3 +88,7 @@
&uart2 {
status = "okay";
};
+
+&timer {
+ compatible = "rockchip,rk3229-timer", "rockchip,rk3288-timer";
+};
--
1.7.9.5

2016-11-28 14:32:18

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 06/11] clocksource/drivers/rockchip_timer: low level routines take rk_timer as parameter

Pass rk_timer instead of clock_event_device to low lever timer routines.
So that code could be reused by clocksource implementation.

This is refactoring step without functional changes.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 47 +++++++++++++++++++---------------
1 file changed, 27 insertions(+), 20 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 6d68d4c..aa9ccd1 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -63,60 +63,67 @@ static inline void __iomem *rk_ctrl(struct clock_event_device *ce)
return rk_timer(ce)->ctrl;
}

-static inline void rk_timer_disable(struct clock_event_device *ce)
+static inline void rk_timer_disable(struct rk_timer *timer)
{
- writel_relaxed(TIMER_DISABLE, rk_ctrl(ce));
+ writel_relaxed(TIMER_DISABLE, timer->ctrl);
}

-static inline void rk_timer_enable(struct clock_event_device *ce, u32 flags)
+static inline void rk_timer_enable(struct rk_timer *timer, u32 flags)
{
writel_relaxed(TIMER_ENABLE | TIMER_INT_UNMASK | flags,
- rk_ctrl(ce));
+ timer->ctrl);
}

static void rk_timer_update_counter(unsigned long cycles,
- struct clock_event_device *ce)
+ struct rk_timer *timer)
{
- writel_relaxed(cycles, rk_base(ce) + TIMER_LOAD_COUNT0);
- writel_relaxed(0, rk_base(ce) + TIMER_LOAD_COUNT1);
+ writel_relaxed(cycles, timer->base + TIMER_LOAD_COUNT0);
+ writel_relaxed(0, timer->base + TIMER_LOAD_COUNT1);
}

-static void rk_timer_interrupt_clear(struct clock_event_device *ce)
+static void rk_timer_interrupt_clear(struct rk_timer *timer)
{
- writel_relaxed(1, rk_base(ce) + TIMER_INT_STATUS);
+ writel_relaxed(1, timer->base + TIMER_INT_STATUS);
}

static inline int rk_timer_set_next_event(unsigned long cycles,
struct clock_event_device *ce)
{
- rk_timer_disable(ce);
- rk_timer_update_counter(cycles, ce);
- rk_timer_enable(ce, TIMER_MODE_USER_DEFINED_COUNT);
+ struct rk_timer *timer = rk_timer(ce);
+
+ rk_timer_disable(timer);
+ rk_timer_update_counter(cycles, timer);
+ rk_timer_enable(timer, TIMER_MODE_USER_DEFINED_COUNT);
return 0;
}

static int rk_timer_shutdown(struct clock_event_device *ce)
{
- rk_timer_disable(ce);
+ struct rk_timer *timer = rk_timer(ce);
+
+ rk_timer_disable(timer);
return 0;
}

static int rk_timer_set_periodic(struct clock_event_device *ce)
{
- rk_timer_disable(ce);
- rk_timer_update_counter(rk_timer(ce)->freq / HZ - 1, ce);
- rk_timer_enable(ce, TIMER_MODE_FREE_RUNNING);
+ struct rk_timer *timer = rk_timer(ce);
+
+ rk_timer_disable(timer);
+ rk_timer_update_counter(timer->freq / HZ - 1, timer);
+ rk_timer_enable(timer, TIMER_MODE_FREE_RUNNING);
return 0;
}

static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *ce = dev_id;
+ struct rk_timer *timer = rk_timer(ce);

- rk_timer_interrupt_clear(ce);
+ rk_timer_interrupt_clear(timer);

if (clockevent_state_oneshot(ce))
- rk_timer_disable(ce);
+ rk_timer_disable(timer);

ce->event_handler(ce);

@@ -183,8 +190,8 @@ static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
ce->cpumask = cpu_possible_mask;
ce->rating = 250;

- rk_timer_interrupt_clear(ce);
- rk_timer_disable(ce);
+ rk_timer_interrupt_clear(timer);
+ rk_timer_disable(timer);

ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER, TIMER_NAME, ce);
if (ret) {
--
1.7.9.5

2016-11-28 14:32:12

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 02/11] ARM: dts: rockchip: update compatible property for rk3228 timer

Property set to '"rockchip,rk3228-timer", "rockchip,rk3288-timer"'
to match devicetree bindings.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
arch/arm/boot/dts/rk3228-evb.dts | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/rk3228-evb.dts b/arch/arm/boot/dts/rk3228-evb.dts
index 904668e..38eab87 100644
--- a/arch/arm/boot/dts/rk3228-evb.dts
+++ b/arch/arm/boot/dts/rk3228-evb.dts
@@ -70,3 +70,7 @@
&uart2 {
status = "okay";
};
+
+&timer {
+ compatible = "rockchip,rk3228-timer", "rockchip,rk3288-timer";
+};
--
1.7.9.5

2016-11-28 14:32:31

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 01/11] dt-bindings: clarify compatible property for rockchip timers

Make all properties description in form '"rockchip,<chip>-timer",
"rockchip,rk3288-timer"' for all chips found in linux kernel.

Suggested-by: Heiko Stübner <[email protected]>
Signed-off-by: Alexander Kochetkov <[email protected]>
---
.../bindings/timer/rockchip,rk-timer.txt | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/timer/rockchip,rk-timer.txt b/Documentation/devicetree/bindings/timer/rockchip,rk-timer.txt
index a41b184..16a5f45 100644
--- a/Documentation/devicetree/bindings/timer/rockchip,rk-timer.txt
+++ b/Documentation/devicetree/bindings/timer/rockchip,rk-timer.txt
@@ -1,9 +1,15 @@
Rockchip rk timer

Required properties:
-- compatible: shall be one of:
- "rockchip,rk3288-timer" - for rk3066, rk3036, rk3188, rk322x, rk3288, rk3368
- "rockchip,rk3399-timer" - for rk3399
+- compatible: should be:
+ "rockchip,rk3036-timer", "rockchip,rk3288-timer": for Rockchip RK3036
+ "rockchip,rk3066-timer", "rockchip,rk3288-timer": for Rockchip RK3066
+ "rockchip,rk3188-timer", "rockchip,rk3288-timer": for Rockchip RK3188
+ "rockchip,rk3228-timer", "rockchip,rk3288-timer": for Rockchip RK3228
+ "rockchip,rk3229-timer", "rockchip,rk3288-timer": for Rockchip RK3229
+ "rockchip,rk3288-timer": for Rockchip RK3288
+ "rockchip,rk3368-timer", "rockchip,rk3288-timer": for Rockchip RK3368
+ "rockchip,rk3399-timer": for Rockchip RK3399
- reg: base address of the timer register starting with TIMERS CONTROL register
- interrupts: should contain the interrupts for Timer0
- clocks : must contain an entry for each entry in clock-names
--
1.7.9.5

2016-11-28 14:32:42

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 07/11] clocksource/drivers/rockchip_timer: drop unused rk_base() and rk_ctrl()

Use of functions has been ceased by previous commit.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 10 ----------
1 file changed, 10 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index aa9ccd1..a17dc61 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -53,16 +53,6 @@ static inline struct rk_timer *rk_timer(struct clock_event_device *ce)
return &rk_clock_event_device(ce)->timer;
}

-static inline void __iomem *rk_base(struct clock_event_device *ce)
-{
- return rk_timer(ce)->base;
-}
-
-static inline void __iomem *rk_ctrl(struct clock_event_device *ce)
-{
- return rk_timer(ce)->ctrl;
-}
-
static inline void rk_timer_disable(struct rk_timer *timer)
{
writel_relaxed(TIMER_DISABLE, timer->ctrl);
--
1.7.9.5

2016-11-28 14:32:51

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 08/11] clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of rk_timer_enable()

This allow to enable timer without enabling interrupts from it.
As that mode will be used in clocksource implementation.

This is refactoring step without functional changes.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index a17dc61..61c3bb1 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -60,8 +60,7 @@ static inline void rk_timer_disable(struct rk_timer *timer)

static inline void rk_timer_enable(struct rk_timer *timer, u32 flags)
{
- writel_relaxed(TIMER_ENABLE | TIMER_INT_UNMASK | flags,
- timer->ctrl);
+ writel_relaxed(TIMER_ENABLE | flags, timer->ctrl);
}

static void rk_timer_update_counter(unsigned long cycles,
@@ -83,7 +82,8 @@ static inline int rk_timer_set_next_event(unsigned long cycles,

rk_timer_disable(timer);
rk_timer_update_counter(cycles, timer);
- rk_timer_enable(timer, TIMER_MODE_USER_DEFINED_COUNT);
+ rk_timer_enable(timer, TIMER_MODE_USER_DEFINED_COUNT |
+ TIMER_INT_UNMASK);
return 0;
}

@@ -101,7 +101,7 @@ static int rk_timer_set_periodic(struct clock_event_device *ce)

rk_timer_disable(timer);
rk_timer_update_counter(timer->freq / HZ - 1, timer);
- rk_timer_enable(timer, TIMER_MODE_FREE_RUNNING);
+ rk_timer_enable(timer, TIMER_MODE_FREE_RUNNING | TIMER_INT_UNMASK);
return 0;
}

--
1.7.9.5

2016-11-28 14:33:43

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 11/11] clocksource/drivers/rockchip_timer: implement clocksource timer

The clock supplying the arm-global-timer on the rk3188 is coming from the
the cpu clock itself and thus changes its rate everytime cpufreq adjusts
the cpu frequency making this timer unsuitable as a stable clocksource.

The rk3188, rk3288 and following socs share a separate timer block already
handled by the rockchip-timer driver. Therefore adapt this driver to also
be able to act as clocksource on rk3188.

In order to test clocksource you can run following commands and check
how much time it take in real. On rk3188 it take about ~45 seconds.
Such error cannot be fixed using NTP. Haven't test clocksource
on rk3288 and onwards. Guess they can also have unstable clocksource.

cpufreq-set -f 1.6GHZ
date; sleep 60; date

In order to use the patch you need to declare two timers in the dts
file. The first timer will be initialized as clockevent provider
and the second one as clocksource. The clockevent must be from
alive subsystem as it used as backup for the local timers at sleep
time.

In order to resolve ambiguity between timers in the device tree,
it is possible to correctly number the timers using "aliases" node.

The patch does not break compatibility with older device tree files.
The older device tree files contain only one timer. The timer
will be initialized as clockevent, as expected.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 101 ++++++++++++++++++++++++++++------
1 file changed, 85 insertions(+), 16 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 6224aa9..430b182 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -11,6 +11,7 @@
#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
@@ -42,7 +43,19 @@ struct rk_clock_event_device {
struct rk_timer timer;
};

+struct rk_clocksource {
+ struct clocksource cs;
+ struct rk_timer timer;
+};
+
+enum {
+ ROCKCHIP_CLKSRC_CLOCKEVENT = 0,
+ ROCKCHIP_CLKSRC_CLOCKSOURCE = 1,
+};
+
static struct rk_clock_event_device bc_timer;
+static struct rk_clocksource cs_timer;
+static int rk_next_clksrc = ROCKCHIP_CLKSRC_CLOCKEVENT;

static inline struct rk_clock_event_device*
rk_clock_event_device(struct clock_event_device *ce)
@@ -143,13 +156,46 @@ static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}

+static cycle_t rk_timer_clocksource_read(struct clocksource *cs)
+{
+ struct rk_clocksource *_cs =
+ container_of(cs, struct rk_clocksource, cs);
+
+ return ~rk_timer_counter_read(&_cs->timer);
+}
+
+static u64 notrace rk_timer_sched_clock_read(void)
+{
+ struct rk_clocksource *_cs = &cs_timer;
+
+ return ~rk_timer_counter_read(&_cs->timer);
+}
+
static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
{
- struct clock_event_device *ce = &bc_timer.ce;
- struct rk_timer *timer = &bc_timer.timer;
+ struct clock_event_device *ce = NULL;
+ struct clocksource *cs = NULL;
+ struct rk_timer *timer = NULL;
struct clk *timer_clk;
struct clk *pclk;
int ret = -EINVAL, irq;
+ int clksrc;
+
+ clksrc = rk_next_clksrc;
+ rk_next_clksrc++;
+
+ switch (clksrc) {
+ case ROCKCHIP_CLKSRC_CLOCKEVENT:
+ ce = &bc_timer.ce;
+ timer = &bc_timer.timer;
+ break;
+ case ROCKCHIP_CLKSRC_CLOCKSOURCE:
+ cs = &cs_timer.cs;
+ timer = &cs_timer.timer;
+ break;
+ default:
+ return -ENODEV;
+ }

timer->base = of_iomap(np, 0);
if (!timer->base) {
@@ -193,26 +239,49 @@ static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
goto out_irq;
}

- ce->name = TIMER_NAME;
- ce->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
- CLOCK_EVT_FEAT_DYNIRQ;
- ce->set_next_event = rk_timer_set_next_event;
- ce->set_state_shutdown = rk_timer_shutdown;
- ce->set_state_periodic = rk_timer_set_periodic;
- ce->irq = irq;
- ce->cpumask = cpu_possible_mask;
- ce->rating = 250;
+ if (ce) {
+ ce->name = TIMER_NAME;
+ ce->features = CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_ONESHOT |
+ CLOCK_EVT_FEAT_DYNIRQ;
+ ce->set_next_event = rk_timer_set_next_event;
+ ce->set_state_shutdown = rk_timer_shutdown;
+ ce->set_state_periodic = rk_timer_set_periodic;
+ ce->irq = irq;
+ ce->cpumask = cpu_possible_mask;
+ ce->rating = 250;
+ }
+
+ if (cs) {
+ cs->name = TIMER_NAME;
+ cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+ cs->mask = CLOCKSOURCE_MASK(64);
+ cs->read = rk_timer_clocksource_read;
+ cs->rating = 350;
+ }

rk_timer_interrupt_clear(timer);
rk_timer_disable(timer);

- ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER, TIMER_NAME, ce);
- if (ret) {
- pr_err("Failed to initialize '%s': %d\n", TIMER_NAME, ret);
- goto out_irq;
+ if (ce) {
+ ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER,
+ TIMER_NAME, ce);
+ if (ret) {
+ pr_err("Failed to initialize '%s': %d\n",
+ TIMER_NAME, ret);
+ goto out_irq;
+ }
+
+ clockevents_config_and_register(ce, timer->freq, 1, UINT_MAX);
}

- clockevents_config_and_register(ce, timer->freq, 1, UINT_MAX);
+ if (cs) {
+ rk_timer_update_counter(U64_MAX, timer);
+ rk_timer_enable(timer, 0);
+ clocksource_register_hz(cs, timer->freq);
+ sched_clock_register(rk_timer_sched_clock_read, 64,
+ timer->freq);
+ }

return 0;

--
1.7.9.5

2016-11-28 14:34:33

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 10/11] clocksource/drivers/rockchip_timer: implement reading 64bit value from timer

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index c2b0454..6224aa9 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -19,6 +19,8 @@

#define TIMER_LOAD_COUNT0 0x00
#define TIMER_LOAD_COUNT1 0x04
+#define TIMER_CURRENT_VALUE0 0x08
+#define TIMER_CURRENT_VALUE1 0x0C
#define TIMER_CONTROL_REG3288 0x10
#define TIMER_CONTROL_REG3399 0x1c
#define TIMER_INT_STATUS 0x18
@@ -72,6 +74,25 @@ static void rk_timer_update_counter(u64 cycles, struct rk_timer *timer)
writel_relaxed(upper, timer->base + TIMER_LOAD_COUNT1);
}

+static u64 rk_timer_counter_read(struct rk_timer *timer)
+{
+ u64 counter;
+ u32 lower;
+ u32 upper, old_upper;
+
+ upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1);
+ do {
+ old_upper = upper;
+ lower = readl_relaxed(timer->base + TIMER_CURRENT_VALUE0);
+ upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1);
+ } while (upper != old_upper);
+
+ counter = upper;
+ counter <<= 32;
+ counter |= lower;
+ return counter;
+}
+
static void rk_timer_interrupt_clear(struct rk_timer *timer)
{
writel_relaxed(1, timer->base + TIMER_INT_STATUS);
--
1.7.9.5

2016-11-28 14:34:45

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCHv2 09/11] clocksource/drivers/rockchip_timer: implement loading 64bit value into timer

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 61c3bb1..c2b0454 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -63,11 +63,13 @@ static inline void rk_timer_enable(struct rk_timer *timer, u32 flags)
writel_relaxed(TIMER_ENABLE | flags, timer->ctrl);
}

-static void rk_timer_update_counter(unsigned long cycles,
- struct rk_timer *timer)
+static void rk_timer_update_counter(u64 cycles, struct rk_timer *timer)
{
- writel_relaxed(cycles, timer->base + TIMER_LOAD_COUNT0);
- writel_relaxed(0, timer->base + TIMER_LOAD_COUNT1);
+ u32 lower = cycles & 0xFFFFFFFF;
+ u32 upper = (cycles >> 32) & 0xFFFFFFFF;
+
+ writel_relaxed(lower, timer->base + TIMER_LOAD_COUNT0);
+ writel_relaxed(upper, timer->base + TIMER_LOAD_COUNT1);
}

static void rk_timer_interrupt_clear(struct rk_timer *timer)
--
1.7.9.5

2016-11-29 13:45:35

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 00/13] Implement clocksource for rockchip SoC using rockchip timer

Hello,

This patch series contain:
- devicetree bindings clarification for rockchip timers
- dts files fixes for rk3228-evb, rk3229-evb and rk3188
- implementation of clocksource for rockchip SoC

The clock supplying the arm-global-timer on the rk3188 is coming from the
the cpu clock itself and thus changes its rate everytime cpufreq adjusts
the cpu frequency making this timer unsuitable as a stable clocksource.

The rk3188, rk3288 and following socs share a separate timer block already
handled by the rockchip-timer driver. Therefore adapt this driver to also
be able to act as clocksource on rk3188.

In order to test clocksource you can run following commands and check
how much time it take in real. On rk3188 it take about ~45 seconds.
Such error cannot be fixed using NTP. Haven't test clocksource
on rk3288 and onwards. Guess they can also have unstable clocksource.

cpufreq-set -f 1.6GHZ
date; sleep 60; date

Regards,
Alexander.

Changes in v3:
added patches:
ARM: dts: rockchip: disable arm-global-timer for rk3188
clocksource/drivers/rockchip_timer: Prevent ftrace recursion

This is try 3. Please discard all v1 patches:

devicetree:
https://patchwork.ozlabs.org/patch/699019/
https://patchwork.ozlabs.org/patch/699020/

kernel:
https://patchwork.kernel.org/patch/9443975/
https://patchwork.kernel.org/patch/9443971/
https://patchwork.kernel.org/patch/9443959/
https://patchwork.kernel.org/patch/9443963/
https://patchwork.kernel.org/patch/9443979/
https://patchwork.kernel.org/patch/9443989/
https://patchwork.kernel.org/patch/9443987/
https://patchwork.kernel.org/patch/9443977/
https://patchwork.kernel.org/patch/9443991/

Old thread:
http://lists.infradead.org/pipermail/linux-rockchip/2016-November/013147.html

Alexander Kochetkov (13):
dt-bindings: clarify compatible property for rockchip timers
ARM: dts: rockchip: update compatible property for rk3228 timer
ARM: dts: rockchip: update compatible property for rk3229 timer
ARM: dts: rockchip: add timer entries to rk3188 dtsi
ARM: dts: rockchip: disable arm-global-timer for rk3188
clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and
rk_clock_event_device
clocksource/drivers/rockchip_timer: low level routines take rk_timer
as parameter
clocksource/drivers/rockchip_timer: drop unused rk_base() and
rk_ctrl()
clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of
rk_timer_enable()
clocksource/drivers/rockchip_timer: implement loading 64bit value
into timer
clocksource/drivers/rockchip_timer: implement reading 64bit value
from timer
clocksource/drivers/rockchip_timer: implement clocksource timer
clocksource/drivers/rockchip_timer: Prevent ftrace recursion

.../bindings/timer/rockchip,rk-timer.txt | 12 +-
arch/arm/boot/dts/rk3188.dtsi | 17 ++
arch/arm/boot/dts/rk3228-evb.dts | 4 +
arch/arm/boot/dts/rk3229-evb.dts | 4 +
drivers/clocksource/rockchip_timer.c | 207 +++++++++++++++-----
5 files changed, 190 insertions(+), 54 deletions(-)

--
1.7.9.5

2016-11-29 13:45:48

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 01/13] dt-bindings: clarify compatible property for rockchip timers

2016-11-29 13:45:59

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 03/13] ARM: dts: rockchip: update compatible property for rk3229 timer

2016-11-29 13:46:18

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 12/13] clocksource/drivers/rockchip_timer: implement clocksource timer

The clock supplying the arm-global-timer on the rk3188 is coming from the
the cpu clock itself and thus changes its rate everytime cpufreq adjusts
the cpu frequency making this timer unsuitable as a stable clocksource.

The rk3188, rk3288 and following socs share a separate timer block already
handled by the rockchip-timer driver. Therefore adapt this driver to also
be able to act as clocksource on rk3188.

In order to test clocksource you can run following commands and check
how much time it take in real. On rk3188 it take about ~45 seconds.
Such error cannot be fixed using NTP. Haven't test clocksource
on rk3288 and onwards. Guess they can also have unstable clocksource.

cpufreq-set -f 1.6GHZ
date; sleep 60; date

In order to use the patch you need to declare two timers in the dts
file. The first timer will be initialized as clockevent provider
and the second one as clocksource. The clockevent must be from
alive subsystem as it used as backup for the local timers at sleep
time.

In order to resolve ambiguity between timers in the device tree,
it is possible to correctly number the timers using "aliases" node.

The patch does not break compatibility with older device tree files.
The older device tree files contain only one timer. The timer
will be initialized as clockevent, as expected.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 101 ++++++++++++++++++++++++++++------
1 file changed, 85 insertions(+), 16 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 6224aa9..1af80a0 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -11,6 +11,7 @@
#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
@@ -42,7 +43,19 @@ struct rk_clock_event_device {
struct rk_timer timer;
};

+struct rk_clocksource {
+ struct clocksource cs;
+ struct rk_timer timer;
+};
+
+enum {
+ ROCKCHIP_CLKSRC_CLOCKEVENT = 0,
+ ROCKCHIP_CLKSRC_CLOCKSOURCE = 1,
+};
+
static struct rk_clock_event_device bc_timer;
+static struct rk_clocksource cs_timer;
+static int rk_next_clksrc = ROCKCHIP_CLKSRC_CLOCKEVENT;

static inline struct rk_clock_event_device*
rk_clock_event_device(struct clock_event_device *ce)
@@ -143,13 +156,46 @@ static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}

+static cycle_t rk_timer_clocksource_read(struct clocksource *cs)
+{
+ struct rk_clocksource *_cs =
+ container_of(cs, struct rk_clocksource, cs);
+
+ return ~rk_timer_counter_read(&_cs->timer);
+}
+
+static u64 notrace rk_timer_sched_clock_read(void)
+{
+ struct rk_clocksource *_cs = &cs_timer;
+
+ return ~rk_timer_counter_read(&_cs->timer);
+}
+
static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
{
- struct clock_event_device *ce = &bc_timer.ce;
- struct rk_timer *timer = &bc_timer.timer;
+ struct clock_event_device *ce = NULL;
+ struct clocksource *cs = NULL;
+ struct rk_timer *timer = NULL;
struct clk *timer_clk;
struct clk *pclk;
int ret = -EINVAL, irq;
+ int clksrc;
+
+ clksrc = rk_next_clksrc;
+ rk_next_clksrc++;
+
+ switch (clksrc) {
+ case ROCKCHIP_CLKSRC_CLOCKEVENT:
+ ce = &bc_timer.ce;
+ timer = &bc_timer.timer;
+ break;
+ case ROCKCHIP_CLKSRC_CLOCKSOURCE:
+ cs = &cs_timer.cs;
+ timer = &cs_timer.timer;
+ break;
+ default:
+ return -ENODEV;
+ }

timer->base = of_iomap(np, 0);
if (!timer->base) {
@@ -193,26 +239,49 @@ static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
goto out_irq;
}

- ce->name = TIMER_NAME;
- ce->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
- CLOCK_EVT_FEAT_DYNIRQ;
- ce->set_next_event = rk_timer_set_next_event;
- ce->set_state_shutdown = rk_timer_shutdown;
- ce->set_state_periodic = rk_timer_set_periodic;
- ce->irq = irq;
- ce->cpumask = cpu_possible_mask;
- ce->rating = 250;
+ if (ce) {
+ ce->name = TIMER_NAME;
+ ce->features = CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_ONESHOT |
+ CLOCK_EVT_FEAT_DYNIRQ;
+ ce->set_next_event = rk_timer_set_next_event;
+ ce->set_state_shutdown = rk_timer_shutdown;
+ ce->set_state_periodic = rk_timer_set_periodic;
+ ce->irq = irq;
+ ce->cpumask = cpu_possible_mask;
+ ce->rating = 250;
+ }
+
+ if (cs) {
+ cs->name = TIMER_NAME;
+ cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+ cs->mask = CLOCKSOURCE_MASK(64);
+ cs->read = rk_timer_clocksource_read;
+ cs->rating = 250;
+ }

rk_timer_interrupt_clear(timer);
rk_timer_disable(timer);

- ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER, TIMER_NAME, ce);
- if (ret) {
- pr_err("Failed to initialize '%s': %d\n", TIMER_NAME, ret);
- goto out_irq;
+ if (ce) {
+ ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER,
+ TIMER_NAME, ce);
+ if (ret) {
+ pr_err("Failed to initialize '%s': %d\n",
+ TIMER_NAME, ret);
+ goto out_irq;
+ }
+
+ clockevents_config_and_register(ce, timer->freq, 1, UINT_MAX);
}

- clockevents_config_and_register(ce, timer->freq, 1, UINT_MAX);
+ if (cs) {
+ rk_timer_update_counter(U64_MAX, timer);
+ rk_timer_enable(timer, 0);
+ clocksource_register_hz(cs, timer->freq);
+ sched_clock_register(rk_timer_sched_clock_read, 64,
+ timer->freq);
+ }

return 0;

--
1.7.9.5

2016-11-29 13:46:29

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 11/13] clocksource/drivers/rockchip_timer: implement reading 64bit value from timer

2016-11-29 13:46:51

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 13/13] clocksource/drivers/rockchip_timer: Prevent ftrace recursion

Currently rockchip_timer can be used as a scheduler clock. We properly
marked rk_timer_sched_clock_read() as notrace but we then call another
function rk_timer_counter_read() that _wasn't_ notrace.

Having a traceable function in the sched_clock() path leads to a recursion
within ftrace and a kernel crash.

Fix this by adding an extra notrace function to keep other users of
rk_timer_counter_read() traceable.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 1af80a0..a127822 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -87,7 +87,7 @@ static void rk_timer_update_counter(u64 cycles, struct rk_timer *timer)
writel_relaxed(upper, timer->base + TIMER_LOAD_COUNT1);
}

-static u64 rk_timer_counter_read(struct rk_timer *timer)
+static u64 notrace _rk_timer_counter_read(struct rk_timer *timer)
{
u64 counter;
u32 lower;
@@ -106,6 +106,11 @@ static u64 rk_timer_counter_read(struct rk_timer *timer)
return counter;
}

+static u64 rk_timer_counter_read(struct rk_timer *timer)
+{
+ return _rk_timer_counter_read(timer);
+}
+
static void rk_timer_interrupt_clear(struct rk_timer *timer)
{
writel_relaxed(1, timer->base + TIMER_INT_STATUS);
@@ -168,7 +173,7 @@ static u64 notrace rk_timer_sched_clock_read(void)
{
struct rk_clocksource *_cs = &cs_timer;

- return ~rk_timer_counter_read(&_cs->timer);
+ return ~_rk_timer_counter_read(&_cs->timer);
}

static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
--
1.7.9.5

2016-11-29 13:47:03

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 08/13] clocksource/drivers/rockchip_timer: drop unused rk_base() and rk_ctrl()

2016-11-29 13:47:14

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 10/13] clocksource/drivers/rockchip_timer: implement loading 64bit value into timer

2016-11-29 13:47:25

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 09/13] clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of rk_timer_enable()

2016-11-29 13:48:49

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 07/13] clocksource/drivers/rockchip_timer: low level routines take rk_timer as parameter

2016-11-29 13:48:59

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 06/13] clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and rk_clock_event_device

2016-11-29 13:49:11

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 05/13] ARM: dts: rockchip: disable arm-global-timer for rk3188

arm-global-timer can provide clockevents, clocksource and shed_clock. But
on rk3188 platform it provide only clocksource and shed_clock. clockevents
from arm-global-timer is not used by kernel because there is another
clockevent provider with higher rating (smp-twd).

My commit from the series implement clocksource and shed_clock using
rockchip_timer. But sched clock from rk_timer is not selected by kernel
due to lower frequency than arm-global-timer, and clocksource from
rk_timer is not selected by kernel due to lower rating than
arm-global-timer. And I don't want to increase clocksource rating
because ratings greater than 300 used for high frequency clocksources.

clocksource and shed_clock is quite unstable, because their rate depends
on cpu frequency. So disable arm-global-timer and use clocksource and
sched_clock from rockchip_timer.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
arch/arm/boot/dts/rk3188.dtsi | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index 0dc52fe..44da3d42 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -546,6 +546,7 @@

&global_timer {
interrupts = <GIC_PPI 11 0xf04>;
+ status = "disabled";
};

&local_timer {
--
1.7.9.5

2016-11-29 13:49:23

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 04/13] ARM: dts: rockchip: add timer entries to rk3188 dtsi

2016-11-29 13:49:33

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v3 02/13] ARM: dts: rockchip: update compatible property for rk3228 timer

2016-11-29 15:03:15

by Heiko Stuebner

[permalink] [raw]

Subject: Re: [PATCH v3 13/13] clocksource/drivers/rockchip_timer: Prevent ftrace recursion

Am Dienstag, 29. November 2016, 16:45:18 schrieb Alexander Kochetkov:
> Currently rockchip_timer can be used as a scheduler clock. We properly
> marked rk_timer_sched_clock_read() as notrace but we then call another
> function rk_timer_counter_read() that _wasn't_ notrace.
>
> Having a traceable function in the sched_clock() path leads to a recursion
> within ftrace and a kernel crash.
>
> Fix this by adding an extra notrace function to keep other users of
> rk_timer_counter_read() traceable.
>
> Signed-off-by: Alexander Kochetkov <[email protected]>

you introduced the issue yourself in patch 11/13. In general any patch should
never leave the kernel in a worse state than it was before, so no patch should
ever introduce known issues itself.

In that line of thought, don't patches 10+11 introduce warnings about unused
functions as well when applied without patch 12?

Maybe merge them?

Heiko

> ---
> drivers/clocksource/rockchip_timer.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/clocksource/rockchip_timer.c
> b/drivers/clocksource/rockchip_timer.c index 1af80a0..a127822 100644
> --- a/drivers/clocksource/rockchip_timer.c
> +++ b/drivers/clocksource/rockchip_timer.c
> @@ -87,7 +87,7 @@ static void rk_timer_update_counter(u64 cycles, struct
> rk_timer *timer) writel_relaxed(upper, timer->base + TIMER_LOAD_COUNT1);
> }
>
> -static u64 rk_timer_counter_read(struct rk_timer *timer)
> +static u64 notrace _rk_timer_counter_read(struct rk_timer *timer)
> {
> u64 counter;
> u32 lower;
> @@ -106,6 +106,11 @@ static u64 rk_timer_counter_read(struct rk_timer
> *timer) return counter;
> }
>
> +static u64 rk_timer_counter_read(struct rk_timer *timer)
> +{
> + return _rk_timer_counter_read(timer);
> +}
> +
> static void rk_timer_interrupt_clear(struct rk_timer *timer)
> {
> writel_relaxed(1, timer->base + TIMER_INT_STATUS);
> @@ -168,7 +173,7 @@ static u64 notrace rk_timer_sched_clock_read(void)
> {
> struct rk_clocksource *_cs = &cs_timer;
>
> - return ~rk_timer_counter_read(&_cs->timer);
> + return ~_rk_timer_counter_read(&_cs->timer);
> }
>
> static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)

2016-11-29 15:03:45

by Heiko Stuebner

[permalink] [raw]

Subject: Re: [PATCH v3 08/13] clocksource/drivers/rockchip_timer: drop unused rk_base() and rk_ctrl()

Am Dienstag, 29. November 2016, 16:45:13 schrieb Alexander Kochetkov:
> Use of functions has been ceased by previous commit.

Then why do you need another patch to remove them and don't do that in the
patch removing their respective usage?

>
> Signed-off-by: Alexander Kochetkov <[email protected]>
> ---
> drivers/clocksource/rockchip_timer.c | 10 ----------
> 1 file changed, 10 deletions(-)
>
> diff --git a/drivers/clocksource/rockchip_timer.c
> b/drivers/clocksource/rockchip_timer.c index aa9ccd1..a17dc61 100644
> --- a/drivers/clocksource/rockchip_timer.c
> +++ b/drivers/clocksource/rockchip_timer.c
> @@ -53,16 +53,6 @@ static inline struct rk_timer *rk_timer(struct
> clock_event_device *ce) return &rk_clock_event_device(ce)->timer;
> }
>
> -static inline void __iomem *rk_base(struct clock_event_device *ce)
> -{
> - return rk_timer(ce)->base;
> -}
> -
> -static inline void __iomem *rk_ctrl(struct clock_event_device *ce)
> -{
> - return rk_timer(ce)->ctrl;
> -}
> -
> static inline void rk_timer_disable(struct rk_timer *timer)
> {
> writel_relaxed(TIMER_DISABLE, timer->ctrl);

2016-11-29 15:36:36

by Alexander Kochetkov

[permalink] [raw]

Subject: Re: [PATCH v3 13/13] clocksource/drivers/rockchip_timer: Prevent ftrace recursion

Hello Heiko!
Thank you for patch review!

> 29 нояб. 2016 г., в 18:01, Heiko Stübner <[email protected]> написал(а):
>
> you introduced the issue yourself in patch 11/13. In general any patch should
> never leave the kernel in a worse state than it was before, so no patch should
> ever introduce known issues itself.

Agree.

> In that line of thought, don't patches 10+11 introduce warnings about unused
> functions as well when applied without patch 12?
7 - yes
10 - not
11 - yes

> 29 нояб. 2016 г., в 18:03, Heiko Stübner <[email protected]> написал(а):
>
> Then why do you need another patch to remove them and don't do that in the
> patch removing their respective usage?

To make 7 more readable. Overwise patch messed up and unreadable.
It’s hard to track what going on in the patch.

> Maybe merge them?

I'll merge all of them.

P.S.
here comment from another thead about the patches.
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-November/thread.html#470957

> 29 нояб. 2016 г., в 18:07, Robin Murphy <[email protected]> написал(а):
>
> 3288 (and probably anything newer) is irrelevant to this discussion, as
> it has the arch timer interface - that may be busted in other ways (such
> as not being correctly set up by firmware and not being always-on as it
> should), but frequency is not one of them. This only affects
> Cortex-A9/A5 based parts.

So I update comments for patches.

Looks, like I study archeology with my patches, as all new ARM chips not
affected by the problem anymore.

Regards,
Alexander.

2016-11-29 16:15:31

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 0/9] Implement clocksource for rockchip SoC using rockchip timer

Hello,

This patch series contain:
- devicetree bindings clarification for rockchip timers
- dts files fixes for rk3228-evb, rk3229-evb and rk3188
- implementation of clocksource and sched clock for rockchip SoC

The clock supplying the arm-global-timer on the rk3188 is coming from the
the cpu clock itself and thus changes its rate everytime cpufreq adjusts
the cpu frequency making this timer unsuitable as a stable clocksource.

The rk3188, rk3288 and following socs share a separate timer block already
handled by the rockchip-timer driver. Therefore adapt this driver to also
be able to act as clocksource on rk3188.

In order to test clocksource you can run following commands and check
how much time it take in real. On rk3188 it take about ~45 seconds.

cpufreq-set -f 1.6GHZ
date; sleep 60; date

rk3288 (and probably anything newer) is irrelevant to this patch,
as it has the arch timer interface. This patch may be usefull
for Cortex-A9/A5 based parts.

Regards,
Alexander.

This is try 4. Please discard all v1, v2, v3 patches.

Changes in v4:
merged 7 and 8 from series 3
merged 10, 11, 12, 13 from series 3
fixed commit message

Changes in v3:
added patches:
ARM: dts: rockchip: disable arm-global-timer for rk3188
clocksource/drivers/rockchip_timer: Prevent ftrace recursion

devicetree v1 patches:
https://patchwork.ozlabs.org/patch/699019/
https://patchwork.ozlabs.org/patch/699020/

kernel v1 patches:
https://patchwork.kernel.org/patch/9443975/
https://patchwork.kernel.org/patch/9443971/
https://patchwork.kernel.org/patch/9443959/
https://patchwork.kernel.org/patch/9443963/
https://patchwork.kernel.org/patch/9443979/
https://patchwork.kernel.org/patch/9443989/
https://patchwork.kernel.org/patch/9443987/
https://patchwork.kernel.org/patch/9443977/
https://patchwork.kernel.org/patch/9443991/

Alexander Kochetkov (9):
dt-bindings: clarify compatible property for rockchip timers
ARM: dts: rockchip: update compatible property for rk3228 timer
ARM: dts: rockchip: update compatible property for rk3229 timer
ARM: dts: rockchip: add timer entries to rk3188 SoC
ARM: dts: rockchip: disable arm-global-timer for rk3188
clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and
rk_clock_event_device
clocksource/drivers/rockchip_timer: low level routines take rk_timer
as parameter
clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of
rk_timer_enable()
clocksource/drivers/rockchip_timer: implement clocksource timer

.../bindings/timer/rockchip,rk-timer.txt | 12 +-
arch/arm/boot/dts/rk3188.dtsi | 17 ++
arch/arm/boot/dts/rk3228-evb.dts | 4 +
arch/arm/boot/dts/rk3229-evb.dts | 4 +
drivers/clocksource/rockchip_timer.c | 207 +++++++++++++++-----
5 files changed, 190 insertions(+), 54 deletions(-)

--
1.7.9.5

2016-11-29 16:15:39

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 2/9] ARM: dts: rockchip: update compatible property for rk3228 timer

2016-11-29 16:15:54

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 8/9] clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of rk_timer_enable()

2016-11-29 16:16:25

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 7/9] clocksource/drivers/rockchip_timer: low level routines take rk_timer as parameter

Pass rk_timer instead of clock_event_device to low lever timer routines.
So that code could be reused by clocksource implementation.

Drop rk_base() and rk_ctrl().

This is refactoring step without functional changes.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 57 ++++++++++++++++------------------
1 file changed, 27 insertions(+), 30 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 6d68d4c..a17dc61 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -53,70 +53,67 @@ static inline struct rk_timer *rk_timer(struct clock_event_device *ce)
return &rk_clock_event_device(ce)->timer;
}

-static inline void __iomem *rk_base(struct clock_event_device *ce)
+static inline void rk_timer_disable(struct rk_timer *timer)
{
- return rk_timer(ce)->base;
+ writel_relaxed(TIMER_DISABLE, timer->ctrl);
}

-static inline void __iomem *rk_ctrl(struct clock_event_device *ce)
-{
- return rk_timer(ce)->ctrl;
-}
-
-static inline void rk_timer_disable(struct clock_event_device *ce)
-{
- writel_relaxed(TIMER_DISABLE, rk_ctrl(ce));
-}
-
-static inline void rk_timer_enable(struct clock_event_device *ce, u32 flags)
+static inline void rk_timer_enable(struct rk_timer *timer, u32 flags)
{
writel_relaxed(TIMER_ENABLE | TIMER_INT_UNMASK | flags,
- rk_ctrl(ce));
+ timer->ctrl);
}

static void rk_timer_update_counter(unsigned long cycles,
- struct clock_event_device *ce)
+ struct rk_timer *timer)
{
- writel_relaxed(cycles, rk_base(ce) + TIMER_LOAD_COUNT0);
- writel_relaxed(0, rk_base(ce) + TIMER_LOAD_COUNT1);
+ writel_relaxed(cycles, timer->base + TIMER_LOAD_COUNT0);
+ writel_relaxed(0, timer->base + TIMER_LOAD_COUNT1);
}

-static void rk_timer_interrupt_clear(struct clock_event_device *ce)
+static void rk_timer_interrupt_clear(struct rk_timer *timer)
{
- writel_relaxed(1, rk_base(ce) + TIMER_INT_STATUS);
+ writel_relaxed(1, timer->base + TIMER_INT_STATUS);
}

static inline int rk_timer_set_next_event(unsigned long cycles,
struct clock_event_device *ce)
{
- rk_timer_disable(ce);
- rk_timer_update_counter(cycles, ce);
- rk_timer_enable(ce, TIMER_MODE_USER_DEFINED_COUNT);
+ struct rk_timer *timer = rk_timer(ce);
+
+ rk_timer_disable(timer);
+ rk_timer_update_counter(cycles, timer);
+ rk_timer_enable(timer, TIMER_MODE_USER_DEFINED_COUNT);
return 0;
}

static int rk_timer_shutdown(struct clock_event_device *ce)
{
- rk_timer_disable(ce);
+ struct rk_timer *timer = rk_timer(ce);
+
+ rk_timer_disable(timer);
return 0;
}

static int rk_timer_set_periodic(struct clock_event_device *ce)
{
- rk_timer_disable(ce);
- rk_timer_update_counter(rk_timer(ce)->freq / HZ - 1, ce);
- rk_timer_enable(ce, TIMER_MODE_FREE_RUNNING);
+ struct rk_timer *timer = rk_timer(ce);
+
+ rk_timer_disable(timer);
+ rk_timer_update_counter(timer->freq / HZ - 1, timer);
+ rk_timer_enable(timer, TIMER_MODE_FREE_RUNNING);
return 0;
}

static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *ce = dev_id;
+ struct rk_timer *timer = rk_timer(ce);

- rk_timer_interrupt_clear(ce);
+ rk_timer_interrupt_clear(timer);

if (clockevent_state_oneshot(ce))
- rk_timer_disable(ce);
+ rk_timer_disable(timer);

ce->event_handler(ce);

@@ -183,8 +180,8 @@ static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
ce->cpumask = cpu_possible_mask;
ce->rating = 250;

- rk_timer_interrupt_clear(ce);
- rk_timer_disable(ce);
+ rk_timer_interrupt_clear(timer);
+ rk_timer_disable(timer);

ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER, TIMER_NAME, ce);
if (ret) {
--
1.7.9.5

2016-11-29 16:16:18

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 9/9] clocksource/drivers/rockchip_timer: implement clocksource timer

The clock supplying the arm-global-timer on the rk3188 is coming from the
the cpu clock itself and thus changes its rate everytime cpufreq adjusts
the cpu frequency making this timer unsuitable as a stable clocksource
and sched clock.

The rk3188, rk3288 and following socs share a separate timer block already
handled by the rockchip-timer driver. Therefore adapt this driver to also
be able to act as clocksource and sched clock on rk3188.

In order to test clocksource you can run following commands and check
how much time it take in real. On rk3188 it take about ~45 seconds.

cpufreq-set -f 1.6GHZ
date; sleep 60; date

In order to use the patch you need to declare two timers in the dts
file. The first timer will be initialized as clockevent provider
and the second one as clocksource. The clockevent must be from
alive subsystem as it used as backup for the local timers at sleep
time.

The patch does not break compatibility with older device tree files.
The older device tree files contain only one timer. The timer
will be initialized as clockevent, as expected.

rk3288 (and probably anything newer) is irrelevant to this patch,
as it has the arch timer interface. This patch may be usefull
for Cortex-A9/A5 based parts.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
drivers/clocksource/rockchip_timer.c | 137 +++++++++++++++++++++++++++++-----
1 file changed, 117 insertions(+), 20 deletions(-)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 61c3bb1..a127822 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -11,6 +11,7 @@
#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
@@ -19,6 +20,8 @@

#define TIMER_LOAD_COUNT0 0x00
#define TIMER_LOAD_COUNT1 0x04
+#define TIMER_CURRENT_VALUE0 0x08
+#define TIMER_CURRENT_VALUE1 0x0C
#define TIMER_CONTROL_REG3288 0x10
#define TIMER_CONTROL_REG3399 0x1c
#define TIMER_INT_STATUS 0x18
@@ -40,7 +43,19 @@ struct rk_clock_event_device {
struct rk_timer timer;
};

+struct rk_clocksource {
+ struct clocksource cs;
+ struct rk_timer timer;
+};
+
+enum {
+ ROCKCHIP_CLKSRC_CLOCKEVENT = 0,
+ ROCKCHIP_CLKSRC_CLOCKSOURCE = 1,
+};
+
static struct rk_clock_event_device bc_timer;
+static struct rk_clocksource cs_timer;
+static int rk_next_clksrc = ROCKCHIP_CLKSRC_CLOCKEVENT;

static inline struct rk_clock_event_device*
rk_clock_event_device(struct clock_event_device *ce)
@@ -63,11 +78,37 @@ static inline void rk_timer_enable(struct rk_timer *timer, u32 flags)
writel_relaxed(TIMER_ENABLE | flags, timer->ctrl);
}

-static void rk_timer_update_counter(unsigned long cycles,
- struct rk_timer *timer)
+static void rk_timer_update_counter(u64 cycles, struct rk_timer *timer)
+{
+ u32 lower = cycles & 0xFFFFFFFF;
+ u32 upper = (cycles >> 32) & 0xFFFFFFFF;
+
+ writel_relaxed(lower, timer->base + TIMER_LOAD_COUNT0);
+ writel_relaxed(upper, timer->base + TIMER_LOAD_COUNT1);
+}
+
+static u64 notrace _rk_timer_counter_read(struct rk_timer *timer)
{
- writel_relaxed(cycles, timer->base + TIMER_LOAD_COUNT0);
- writel_relaxed(0, timer->base + TIMER_LOAD_COUNT1);
+ u64 counter;
+ u32 lower;
+ u32 upper, old_upper;
+
+ upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1);
+ do {
+ old_upper = upper;
+ lower = readl_relaxed(timer->base + TIMER_CURRENT_VALUE0);
+ upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1);
+ } while (upper != old_upper);
+
+ counter = upper;
+ counter <<= 32;
+ counter |= lower;
+ return counter;
+}
+
+static u64 rk_timer_counter_read(struct rk_timer *timer)
+{
+ return _rk_timer_counter_read(timer);
}

static void rk_timer_interrupt_clear(struct rk_timer *timer)
@@ -120,13 +161,46 @@ static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}

+static cycle_t rk_timer_clocksource_read(struct clocksource *cs)
+{
+ struct rk_clocksource *_cs =
+ container_of(cs, struct rk_clocksource, cs);
+
+ return ~rk_timer_counter_read(&_cs->timer);
+}
+
+static u64 notrace rk_timer_sched_clock_read(void)
+{
+ struct rk_clocksource *_cs = &cs_timer;
+
+ return ~_rk_timer_counter_read(&_cs->timer);
+}
+
static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
{
- struct clock_event_device *ce = &bc_timer.ce;
- struct rk_timer *timer = &bc_timer.timer;
+ struct clock_event_device *ce = NULL;
+ struct clocksource *cs = NULL;
+ struct rk_timer *timer = NULL;
struct clk *timer_clk;
struct clk *pclk;
int ret = -EINVAL, irq;
+ int clksrc;
+
+ clksrc = rk_next_clksrc;
+ rk_next_clksrc++;
+
+ switch (clksrc) {
+ case ROCKCHIP_CLKSRC_CLOCKEVENT:
+ ce = &bc_timer.ce;
+ timer = &bc_timer.timer;
+ break;
+ case ROCKCHIP_CLKSRC_CLOCKSOURCE:
+ cs = &cs_timer.cs;
+ timer = &cs_timer.timer;
+ break;
+ default:
+ return -ENODEV;
+ }

timer->base = of_iomap(np, 0);
if (!timer->base) {
@@ -170,26 +244,49 @@ static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
goto out_irq;
}

- ce->name = TIMER_NAME;
- ce->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
- CLOCK_EVT_FEAT_DYNIRQ;
- ce->set_next_event = rk_timer_set_next_event;
- ce->set_state_shutdown = rk_timer_shutdown;
- ce->set_state_periodic = rk_timer_set_periodic;
- ce->irq = irq;
- ce->cpumask = cpu_possible_mask;
- ce->rating = 250;
+ if (ce) {
+ ce->name = TIMER_NAME;
+ ce->features = CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_ONESHOT |
+ CLOCK_EVT_FEAT_DYNIRQ;
+ ce->set_next_event = rk_timer_set_next_event;
+ ce->set_state_shutdown = rk_timer_shutdown;
+ ce->set_state_periodic = rk_timer_set_periodic;
+ ce->irq = irq;
+ ce->cpumask = cpu_possible_mask;
+ ce->rating = 250;
+ }
+
+ if (cs) {
+ cs->name = TIMER_NAME;
+ cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+ cs->mask = CLOCKSOURCE_MASK(64);
+ cs->read = rk_timer_clocksource_read;
+ cs->rating = 250;
+ }

rk_timer_interrupt_clear(timer);
rk_timer_disable(timer);

- ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER, TIMER_NAME, ce);
- if (ret) {
- pr_err("Failed to initialize '%s': %d\n", TIMER_NAME, ret);
- goto out_irq;
+ if (ce) {
+ ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER,
+ TIMER_NAME, ce);
+ if (ret) {
+ pr_err("Failed to initialize '%s': %d\n",
+ TIMER_NAME, ret);
+ goto out_irq;
+ }
+
+ clockevents_config_and_register(ce, timer->freq, 1, UINT_MAX);
}

- clockevents_config_and_register(ce, timer->freq, 1, UINT_MAX);
+ if (cs) {
+ rk_timer_update_counter(U64_MAX, timer);
+ rk_timer_enable(timer, 0);
+ clocksource_register_hz(cs, timer->freq);
+ sched_clock_register(rk_timer_sched_clock_read, 64,
+ timer->freq);
+ }

return 0;

--
1.7.9.5

2016-11-29 16:16:36

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 6/9] clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and rk_clock_event_device

2016-11-29 16:16:47

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 5/9] ARM: dts: rockchip: disable arm-global-timer for rk3188

arm-global-timer can provide clockevents, clocksource and shed_clock. But
on rk3188 platform it provide only clocksource and shed_clock. clockevents
from arm-global-timer is not used by kernel because there is another
clockevent provider with higher rating (smp-twd).

My commit from the series implement clocksource and shed_clock using
rockchip_timer. But sched clock from rk_timer is not selected by kernel
due to lower frequency than arm-global-timer, and clocksource from
rk_timer is not selected by kernel due to lower rating than
arm-global-timer. And I don't want to increase clocksource rating
because ratings greater 300 used for high frequency clocksources.

clocksource and shed_clock is quite unstable, because their rate depends
on cpu frequency. So disable arm-global-timer and use clocksource and
sched_clock from rockchip_timer.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
arch/arm/boot/dts/rk3188.dtsi | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index 0dc52fe..44da3d42 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -546,6 +546,7 @@

&global_timer {
interrupts = <GIC_PPI 11 0xf04>;
+ status = "disabled";
};

&local_timer {
--
1.7.9.5

2016-11-29 16:16:56

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 4/9] ARM: dts: rockchip: add timer entries to rk3188 SoC

The patch add two timers to all rk3188 based boards.

The first timer is from alive subsystem and it act as a backup
for the local timers at sleep time. It act the same as other
SoC rockchip timers already present in kernel.

The second timer is from CPU subsystem and act as replacement
for the arm-global-timer clocksource and sched clock. It run
at stable frequency 24MHz.

Signed-off-by: Alexander Kochetkov <[email protected]>
---
arch/arm/boot/dts/rk3188.dtsi | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index 31f81b2..0dc52fe 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -106,6 +106,22 @@
};
};

+ timer3: timer@2000e000 {
+ compatible = "rockchip,rk3188-timer", "rockchip,rk3288-timer";
+ reg = <0x2000e000 0x20>;
+ interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&cru SCLK_TIMER3>, <&cru PCLK_TIMER3>;
+ clock-names = "timer", "pclk";
+ };
+
+ timer6: timer@200380a0 {
+ compatible = "rockchip,rk3188-timer", "rockchip,rk3288-timer";
+ reg = <0x200380a0 0x20>;
+ interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&cru SCLK_TIMER6>, <&cru PCLK_TIMER0>;
+ clock-names = "timer", "pclk";
+ };
+
i2s0: i2s@1011a000 {
compatible = "rockchip,rk3188-i2s", "rockchip,rk3066-i2s";
reg = <0x1011a000 0x2000>;
--
1.7.9.5

2016-11-29 16:17:09

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 3/9] ARM: dts: rockchip: update compatible property for rk3229 timer

2016-11-29 16:18:22

by Alexander Kochetkov

[permalink] [raw]

Subject: [PATCH v4 1/9] dt-bindings: clarify compatible property for rockchip timers

2016-12-05 22:22:46

by Rob Herring (Arm)

[permalink] [raw]

Subject: Re: [PATCH v4 1/9] dt-bindings: clarify compatible property for rockchip timers

On Tue, Nov 29, 2016 at 07:14:44PM +0300, Alexander Kochetkov wrote:
> Make all properties description in form '"rockchip,<chip>-timer",
> "rockchip,rk3288-timer"' for all chips found in linux kernel.
>
> Suggested-by: Heiko St?bner <[email protected]>
> Signed-off-by: Alexander Kochetkov <[email protected]>
> ---
> .../bindings/timer/rockchip,rk-timer.txt | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)

Acked-by: Rob Herring <[email protected]>

2016-12-21 14:21:12

by Alexander Kochetkov

[permalink] [raw]

Subject: Re: [PATCH v4 0/9] Implement clocksource for rockchip SoC using rockchip timer

Hello Heiko, Daniel!

Are there any reasons why the patches [1][2] are not applied yet into kernel?
How can I help in applying patches?

Regards,
Alexander.

[1] http://lists.infradead.org/pipermail/linux-rockchip/2016-November/thread.html#13236
[PATCH v4 0/9] Implement clocksource for rockchip SoC using rockchip timer
[2] http://lists.infradead.org/pipermail/linux-rockchip/2016-December/013308.html

> 29 нояб. 2016 г., в 19:14, Alexander Kochetkov <[email protected]> написал(а):
>
> Hello,
>
> This patch series contain:
> - devicetree bindings clarification for rockchip timers
> - dts files fixes for rk3228-evb, rk3229-evb and rk3188
> - implementation of clocksource and sched clock for rockchip SoC
>
> The clock supplying the arm-global-timer on the rk3188 is coming from the
> the cpu clock itself and thus changes its rate everytime cpufreq adjusts
> the cpu frequency making this timer unsuitable as a stable clocksource.
>
> The rk3188, rk3288 and following socs share a separate timer block already
> handled by the rockchip-timer driver. Therefore adapt this driver to also
> be able to act as clocksource on rk3188.
>
> In order to test clocksource you can run following commands and check
> how much time it take in real. On rk3188 it take about ~45 seconds.
>
> cpufreq-set -f 1.6GHZ
> date; sleep 60; date
>
> rk3288 (and probably anything newer) is irrelevant to this patch,
> as it has the arch timer interface. This patch may be usefull
> for Cortex-A9/A5 based parts.
>
> Regards,
> Alexander.
>
> This is try 4. Please discard all v1, v2, v3 patches.
>
> Changes in v4:
> merged 7 and 8 from series 3
> merged 10, 11, 12, 13 from series 3
> fixed commit message
>
> Changes in v3:
> added patches:
> ARM: dts: rockchip: disable arm-global-timer for rk3188
> clocksource/drivers/rockchip_timer: Prevent ftrace recursion
>
> devicetree v1 patches:
> https://patchwork.ozlabs.org/patch/699019/
> https://patchwork.ozlabs.org/patch/699020/
>
> kernel v1 patches:
> https://patchwork.kernel.org/patch/9443975/
> https://patchwork.kernel.org/patch/9443971/
> https://patchwork.kernel.org/patch/9443959/
> https://patchwork.kernel.org/patch/9443963/
> https://patchwork.kernel.org/patch/9443979/
> https://patchwork.kernel.org/patch/9443989/
> https://patchwork.kernel.org/patch/9443987/
> https://patchwork.kernel.org/patch/9443977/
> https://patchwork.kernel.org/patch/9443991/
>
> Alexander Kochetkov (9):
> dt-bindings: clarify compatible property for rockchip timers
> ARM: dts: rockchip: update compatible property for rk3228 timer
> ARM: dts: rockchip: update compatible property for rk3229 timer
> ARM: dts: rockchip: add timer entries to rk3188 SoC
> ARM: dts: rockchip: disable arm-global-timer for rk3188
> clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and
> rk_clock_event_device
> clocksource/drivers/rockchip_timer: low level routines take rk_timer
> as parameter
> clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of
> rk_timer_enable()
> clocksource/drivers/rockchip_timer: implement clocksource timer
>
> .../bindings/timer/rockchip,rk-timer.txt | 12 +-
> arch/arm/boot/dts/rk3188.dtsi | 17 ++
> arch/arm/boot/dts/rk3228-evb.dts | 4 +
> arch/arm/boot/dts/rk3229-evb.dts | 4 +
> drivers/clocksource/rockchip_timer.c | 207 +++++++++++++++-----
> 5 files changed, 190 insertions(+), 54 deletions(-)
>
> --
> 1.7.9.5
>