[PATCH 1/3] drivers: cpuidle: add status property to ARM idle states

[PATCH 1/3] drivers: cpuidle: add status property to ARM idle states

[Lorenzo Pieralisi]

On some platforms the device tree bindings must provide the kernel
with a status flag for idle states, that defines whether the idle
state is operational or not in the current configuration.

This patch adds a status property to the ARM idle states compliant
with ePAPR v1.1 and updates the DT parsing code accordingly.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
 Documentation/devicetree/bindings/arm/idle-states.txt | 14 ++++++++++++++
 drivers/cpuidle/dt_idle_states.c                      |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/idle-states.txt b/Documentation/devicetree/bindings/arm/idle-states.txt
index 37375c7..d8ab4b9 100644
--- a/Documentation/devicetree/bindings/arm/idle-states.txt
+++ b/Documentation/devicetree/bindings/arm/idle-states.txt
@@ -317,6 +317,20 @@ follows:
 			    In such systems entry-latency-us + exit-latency-us
 			    will exceed wakeup-latency-us by this duration.
 
+	- status:
+		Usage: Optional
+		Value type: <string>
+		Definition: A standard device tree property [5] that indicates
+			    the operational status of an idle-state.
+			    If present, it shall be:
+			    "okay": to indicate that the idle state is
+				    operational.
+			    "disabled": to indicate that the idle state has
+					been disabled in firmware so it is not
+					operational.
+			    If property is not present the idle-state must be
+			    considered operational.
+
 	In addition to the properties listed above, a state node may require
 	additional properties specifics to the entry-method defined in the
 	idle-states node, please refer to the entry-method bindings
diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index 52f4d11..22840f4 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -169,6 +169,9 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
 		if (!state_node)
 			break;
 
+		if (!of_device_is_available(state_node))
+			continue;
+
 		if (!idle_state_valid(state_node, i, cpumask)) {
 			pr_warn("%s idle state not valid, bailing out\n",
 				state_node->full_name);
-- 
2.1.2

[PATCH 2/3] drivers: cpuidle: add idle-state-name description to ARM idle states

[Lorenzo Pieralisi]

On ARM machines, where generally speaking the idle state numbering has
no fixed and standard meaning it is useful to provide a description
of the idle state inner workings for benchmarking and monitoring purposes.

This patch adds a property to the idle states bindings that if present
gives platform firmware a means of describing the idle state and export
the string description to user space.

The patch updates the DT parsing code accordingly to take the description,
if present, into consideration.

Cc: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
 Documentation/devicetree/bindings/arm/idle-states.txt | 6 ++++++
 drivers/cpuidle/dt_idle_states.c                      | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/idle-states.txt b/Documentation/devicetree/bindings/arm/idle-states.txt
index d8ab4b9..6f68718 100644
--- a/Documentation/devicetree/bindings/arm/idle-states.txt
+++ b/Documentation/devicetree/bindings/arm/idle-states.txt
@@ -331,6 +331,12 @@ follows:
 			    If property is not present the idle-state must be
 			    considered operational.
 
+	- idle-state-name:
+		Usage: Optional
+		Value type: <string>
+		Definition: A string used as a descriptive name for the idle
+			    state.
+
 	In addition to the properties listed above, a state node may require
 	additional properties specifics to the entry-method defined in the
 	idle-states node, please refer to the entry-method bindings
diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index 22840f4..5301912 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -27,6 +27,7 @@ static int init_state_node(struct cpuidle_state *idle_state,
 {
 	int err;
 	const struct of_device_id *match_id;
+	const char *desc;
 
 	match_id = of_match_node(matches, state_node);
 	if (!match_id)
@@ -73,6 +74,10 @@ static int init_state_node(struct cpuidle_state *idle_state,
 		return -EINVAL;
 	}
 
+	err = of_property_read_string(state_node, "idle-state-name", &desc);
+	if (err)
+		desc = state_node->name;
+
 	idle_state->flags = CPUIDLE_FLAG_TIME_VALID;
 	if (of_property_read_bool(state_node, "local-timer-stop"))
 		idle_state->flags |= CPUIDLE_FLAG_TIMER_STOP;
@@ -82,7 +87,7 @@ static int init_state_node(struct cpuidle_state *idle_state,
 	 *	and desc become string pointers
 	 */
 	strncpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN - 1);
-	strncpy(idle_state->desc, state_node->name, CPUIDLE_DESC_LEN - 1);
+	strncpy(idle_state->desc, desc, CPUIDLE_DESC_LEN - 1);
 	return 0;
 }
 
-- 
2.1.2

[PATCH 3/3] drivers: cpuidle: remove cpuidle-arm64 duplicate error messages

[Lorenzo Pieralisi]

Current CPUidle driver for arm64 machines spits errors upon idle
state initialization and cpuidle driver registration failures.
These error messages are already printed in core code so there is
no need to print them again.

This patch removes the duplicate print messages from the cpuidle-arm64
driver.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
 drivers/cpuidle/cpuidle-arm64.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-arm64.c b/drivers/cpuidle/cpuidle-arm64.c
index 50997ea..1b10f92e 100644
--- a/drivers/cpuidle/cpuidle-arm64.c
+++ b/drivers/cpuidle/cpuidle-arm64.c
@@ -104,11 +104,8 @@ static int __init arm64_idle_init(void)
 	 * reason to initialize the idle driver if only wfi is supported.
 	 */
 	ret = dt_init_idle_driver(drv, arm64_idle_state_match, 1);
-	if (ret <= 0) {
-		if (ret)
-			pr_err("failed to initialize idle states\n");
+	if (ret <= 0)
 		return ret ? : -ENODEV;
-	}
 
 	/*
 	 * Call arch CPU operations in order to initialize
@@ -122,12 +119,6 @@ static int __init arm64_idle_init(void)
 		}
 	}
 
-	ret = cpuidle_register(drv, NULL);
-	if (ret) {
-		pr_err("failed to register cpuidle driver\n");
-		return ret;
-	}
-
-	return 0;
+	return cpuidle_register(drv, NULL);
 }
 device_initcall(arm64_idle_init);
-- 
2.1.2

Re: [PATCH 1/3] drivers: cpuidle: add status property to ARM idle states

[Kevin Hilman]

Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> writes:

> On some platforms the device tree bindings must provide the kernel
> with a status flag for idle states, that defines whether the idle
> state is operational or not in the current configuration.
>
> This patch adds a status property to the ARM idle states compliant
> with ePAPR v1.1 and updates the DT parsing code accordingly.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

For the series:

Acked-by: Kevin Hilman <khilman@linaro.org>

Kevin

Re: [PATCH 1/3] drivers: cpuidle: add status property to ARM idle states

[Lorenzo Pieralisi]

On Mon, Oct 20, 2014 at 10:38:02PM +0100, Kevin Hilman wrote:
> Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> writes:
> 
> > On some platforms the device tree bindings must provide the kernel
> > with a status flag for idle states, that defines whether the idle
> > state is operational or not in the current configuration.
> >
> > This patch adds a status property to the ARM idle states compliant
> > with ePAPR v1.1 and updates the DT parsing code accordingly.
> >
> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> 
> For the series:
> 
> Acked-by: Kevin Hilman <khilman@linaro.org>

Thanks ! I will queue it for 3.19 then.

Lorenzo

Re: [PATCH 1/3] drivers: cpuidle: add status property to ARM idle states

[Daniel Lezcano]

On 10/21/2014 06:20 PM, Lorenzo Pieralisi wrote:
> On Mon, Oct 20, 2014 at 10:38:02PM +0100, Kevin Hilman wrote:
>> Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org> writes:
>>
>>> On some platforms the device tree bindings must provide the kernel
>>> with a status flag for idle states, that defines whether the idle
>>> state is operational or not in the current configuration.
>>>
>>> This patch adds a status property to the ARM idle states compliant
>>> with ePAPR v1.1 and updates the DT parsing code accordingly.
>>>
>>> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
>>
>> For the series:
>>
>> Acked-by: Kevin Hilman <khilman-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>
> Thanks ! I will queue it for 3.19 then.

Applied to my tree for 3.19.

Thanks
   -- Daniel


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Re: [PATCH 1/3] drivers: cpuidle: add status property to ARM idle states

[Lorenzo Pieralisi]

On Mon, Nov 10, 2014 at 07:45:32AM +0000, Daniel Lezcano wrote:
> On 10/21/2014 06:20 PM, Lorenzo Pieralisi wrote:
> > On Mon, Oct 20, 2014 at 10:38:02PM +0100, Kevin Hilman wrote:
> >> Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> writes:
> >>
> >>> On some platforms the device tree bindings must provide the kernel
> >>> with a status flag for idle states, that defines whether the idle
> >>> state is operational or not in the current configuration.
> >>>
> >>> This patch adds a status property to the ARM idle states compliant
> >>> with ePAPR v1.1 and updates the DT parsing code accordingly.
> >>>
> >>> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> >>
> >> For the series:
> >>
> >> Acked-by: Kevin Hilman <khilman@linaro.org>
> >
> > Thanks ! I will queue it for 3.19 then.
> 
> Applied to my tree for 3.19.
> 
> Thanks
>    -- Daniel

Thank you !

Lorenzo