diff mbox

[v2] cpufreq: st: enable selective initialization based on the platform

Message ID 1461773939-1004-1-git-send-email-sudeep.holla@arm.com (mailing list archive)
State Accepted, archived
Delegated to: Rafael Wysocki
Headers show

Commit Message

Sudeep Holla April 27, 2016, 4:18 p.m. UTC 
The sti-cpufreq does unconditional registration of the cpufreq-dt driver
which causes issue on an multi-platform build. For example, on Vexpress
TC2 platform, we get the following error on boot:

cpu cpu0: OPP-v2 not supported
cpu cpu0: Not doing voltage scaling
cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table
	for cpu:0, -19
cpu cpu0: dev_pm_opp_get_max_volt_latency: Invalid regulator (-6)
...
arm_big_little: bL_cpufreq_register: Failed registering platform driver:
		vexpress-spc, err: -17

The actual driver fails to initialise as cpufreq-dt is probed
successfully, which is incorrect. This issue can happen to any platform
not using cpufreq-dt in a multi-platform build.

This patch adds a check to do selective initialization of the driver.

Cc: Lee Jones <lee.jones@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linux-pm@vger.kernel.org
Fixes: ab0ea257fc58 ("cpufreq: st: Provide runtime initialised driver for ST's platforms")
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/cpufreq/sti-cpufreq.c | 4 ++++
 1 file changed, 4 insertions(+)

v1->v2:
	- Updated compatible strings as per Lee's confirmation

--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-pm" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Comments

Viresh Kumar April 28, 2016, 2:19 a.m. UTC | #1 
On 27-04-16, 17:18, Sudeep Holla wrote:
> The sti-cpufreq does unconditional registration of the cpufreq-dt driver
> which causes issue on an multi-platform build. For example, on Vexpress
> TC2 platform, we get the following error on boot:
> 
> cpu cpu0: OPP-v2 not supported
> cpu cpu0: Not doing voltage scaling
> cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table
> 	for cpu:0, -19
> cpu cpu0: dev_pm_opp_get_max_volt_latency: Invalid regulator (-6)
> ...
> arm_big_little: bL_cpufreq_register: Failed registering platform driver:
> 		vexpress-spc, err: -17
> 
> The actual driver fails to initialise as cpufreq-dt is probed
> successfully, which is incorrect. This issue can happen to any platform
> not using cpufreq-dt in a multi-platform build.
> 
> This patch adds a check to do selective initialization of the driver.
> 
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> Fixes: ab0ea257fc58 ("cpufreq: st: Provide runtime initialised driver for ST's platforms")
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
>  drivers/cpufreq/sti-cpufreq.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> v1->v2:
> 	- Updated compatible strings as per Lee's confirmation
> 
> diff --git a/drivers/cpufreq/sti-cpufreq.c b/drivers/cpufreq/sti-cpufreq.c
> index a9c659f58974..04042038ec4b 100644
> --- a/drivers/cpufreq/sti-cpufreq.c
> +++ b/drivers/cpufreq/sti-cpufreq.c
> @@ -259,6 +259,10 @@ static int sti_cpufreq_init(void)
>  {
>  	int ret;
> 
> +	if ((!of_machine_is_compatible("st,stih407")) &&
> +		(!of_machine_is_compatible("st,stih410")))
> +		return -ENODEV;
> +
>  	ddata.cpu = get_cpu_device(0);
>  	if (!ddata.cpu) {
>  		dev_err(ddata.cpu, "Failed to get device for CPU0\n");

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Lee Jones April 28, 2016, 7:19 a.m. UTC | #2 
On Wed, 27 Apr 2016, Sudeep Holla wrote:

> The sti-cpufreq does unconditional registration of the cpufreq-dt driver
> which causes issue on an multi-platform build. For example, on Vexpress
> TC2 platform, we get the following error on boot:
> 
> cpu cpu0: OPP-v2 not supported
> cpu cpu0: Not doing voltage scaling
> cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table
> 	for cpu:0, -19
> cpu cpu0: dev_pm_opp_get_max_volt_latency: Invalid regulator (-6)
> ...
> arm_big_little: bL_cpufreq_register: Failed registering platform driver:
> 		vexpress-spc, err: -17
> 
> The actual driver fails to initialise as cpufreq-dt is probed
> successfully, which is incorrect. This issue can happen to any platform
> not using cpufreq-dt in a multi-platform build.
> 
> This patch adds a check to do selective initialization of the driver.
> 
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> Fixes: ab0ea257fc58 ("cpufreq: st: Provide runtime initialised driver for ST's platforms")
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
>  drivers/cpufreq/sti-cpufreq.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> v1->v2:
> 	- Updated compatible strings as per Lee's confirmation

Acked-by: Lee Jones <lee.jones@linaro.org>

> diff --git a/drivers/cpufreq/sti-cpufreq.c b/drivers/cpufreq/sti-cpufreq.c
> index a9c659f58974..04042038ec4b 100644
> --- a/drivers/cpufreq/sti-cpufreq.c
> +++ b/drivers/cpufreq/sti-cpufreq.c
> @@ -259,6 +259,10 @@ static int sti_cpufreq_init(void)
>  {
>  	int ret;
> 
> +	if ((!of_machine_is_compatible("st,stih407")) &&
> +		(!of_machine_is_compatible("st,stih410")))
> +		return -ENODEV;
> +
>  	ddata.cpu = get_cpu_device(0);
>  	if (!ddata.cpu) {
>  		dev_err(ddata.cpu, "Failed to get device for CPU0\n");
Rafael J. Wysocki May 4, 2016, 9:22 p.m. UTC | #3 
On Wednesday, April 27, 2016 05:18:59 PM Sudeep Holla wrote:
> The sti-cpufreq does unconditional registration of the cpufreq-dt driver
> which causes issue on an multi-platform build. For example, on Vexpress
> TC2 platform, we get the following error on boot:
> 
> cpu cpu0: OPP-v2 not supported
> cpu cpu0: Not doing voltage scaling
> cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table
> 	for cpu:0, -19
> cpu cpu0: dev_pm_opp_get_max_volt_latency: Invalid regulator (-6)
> ...
> arm_big_little: bL_cpufreq_register: Failed registering platform driver:
> 		vexpress-spc, err: -17
> 
> The actual driver fails to initialise as cpufreq-dt is probed
> successfully, which is incorrect. This issue can happen to any platform
> not using cpufreq-dt in a multi-platform build.
> 
> This patch adds a check to do selective initialization of the driver.
> 
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> Fixes: ab0ea257fc58 ("cpufreq: st: Provide runtime initialised driver for ST's platforms")
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
>  drivers/cpufreq/sti-cpufreq.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> v1->v2:
> 	- Updated compatible strings as per Lee's confirmation
> 
> diff --git a/drivers/cpufreq/sti-cpufreq.c b/drivers/cpufreq/sti-cpufreq.c
> index a9c659f58974..04042038ec4b 100644
> --- a/drivers/cpufreq/sti-cpufreq.c
> +++ b/drivers/cpufreq/sti-cpufreq.c
> @@ -259,6 +259,10 @@ static int sti_cpufreq_init(void)
>  {
>  	int ret;
> 
> +	if ((!of_machine_is_compatible("st,stih407")) &&
> +		(!of_machine_is_compatible("st,stih410")))
> +		return -ENODEV;
> +
>  	ddata.cpu = get_cpu_device(0);
>  	if (!ddata.cpu) {
>  		dev_err(ddata.cpu, "Failed to get device for CPU0\n");

Applied with the ACKs, thanks!

--
To unsubscribe from this list: send the line "unsubscribe linux-pm" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/cpufreq/sti-cpufreq.c b/drivers/cpufreq/sti-cpufreq.c
index a9c659f58974..04042038ec4b 100644
--- a/drivers/cpufreq/sti-cpufreq.c
+++ b/drivers/cpufreq/sti-cpufreq.c
@@ -259,6 +259,10 @@  static int sti_cpufreq_init(void)
 {
 	int ret;

+	if ((!of_machine_is_compatible("st,stih407")) &&
+		(!of_machine_is_compatible("st,stih410")))
+		return -ENODEV;
+
 	ddata.cpu = get_cpu_device(0);
 	if (!ddata.cpu) {
 		dev_err(ddata.cpu, "Failed to get device for CPU0\n");