diff mbox series

[v4,02/10] cpufreq: qcom-nvmem: Add support for IPQ9574

Message ID 20240703091651.2820236-3-quic_varada@quicinc.com (mailing list archive)
State Handled Elsewhere, archived
Headers show
Series Enable CPR for IPQ9574 | expand

Commit Message

Varadarajan Narayanan July 3, 2024, 9:16 a.m. UTC
Add qcom_cpufreq_match_data for IPQ9574. This is used for tying
up the cpu@N nodes with the power domains. match_data_kryo is not
used since it doesn't set genpd_names. If genpd_names is not set,
'cat /sys/kernel/debug/qcom_cpr3/thread0' causes cpr3_debug_info_show()
to crash while trying to read thread->corner->last_uV as
thread->corner is NULL.

	Call trace:
		cpr3_debug_info_show
		seq_read_iter
		seq_read

Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
---
v4: Update commit log to include stack trace
    Introduce qcom_cpufreq_match_data for IPQ9574
---
 drivers/cpufreq/qcom-cpufreq-nvmem.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Comments

Viresh Kumar July 3, 2024, 10:19 a.m. UTC | #1
On 03-07-24, 14:46, Varadarajan Narayanan wrote:
> Add qcom_cpufreq_match_data for IPQ9574. This is used for tying
> up the cpu@N nodes with the power domains. match_data_kryo is not
> used since it doesn't set genpd_names. If genpd_names is not set,
> 'cat /sys/kernel/debug/qcom_cpr3/thread0' causes cpr3_debug_info_show()
> to crash while trying to read thread->corner->last_uV as
> thread->corner is NULL.
> 
> 	Call trace:
> 		cpr3_debug_info_show
> 		seq_read_iter
> 		seq_read
> 
> Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
> ---
> v4: Update commit log to include stack trace
>     Introduce qcom_cpufreq_match_data for IPQ9574

Can I apply this without other changes ?
Dmitry Baryshkov July 3, 2024, 10:47 a.m. UTC | #2
On Wed, Jul 03, 2024 at 03:49:44PM GMT, Viresh Kumar wrote:
> On 03-07-24, 14:46, Varadarajan Narayanan wrote:
> > Add qcom_cpufreq_match_data for IPQ9574. This is used for tying
> > up the cpu@N nodes with the power domains. match_data_kryo is not
> > used since it doesn't set genpd_names. If genpd_names is not set,
> > 'cat /sys/kernel/debug/qcom_cpr3/thread0' causes cpr3_debug_info_show()
> > to crash while trying to read thread->corner->last_uV as
> > thread->corner is NULL.
> > 
> > 	Call trace:
> > 		cpr3_debug_info_show
> > 		seq_read_iter
> > 		seq_read
> > 
> > Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
> > ---
> > v4: Update commit log to include stack trace
> >     Introduce qcom_cpufreq_match_data for IPQ9574
> 
> Can I apply this without other changes ?

It will break CPUfreq support on IPQ9574. So this patch should go last.
Dmitry Baryshkov July 3, 2024, 11:02 a.m. UTC | #3
On Wed, Jul 03, 2024 at 02:46:43PM GMT, Varadarajan Narayanan wrote:
> Add qcom_cpufreq_match_data for IPQ9574. This is used for tying
> up the cpu@N nodes with the power domains. match_data_kryo is not
> used since it doesn't set genpd_names. If genpd_names is not set,
> 'cat /sys/kernel/debug/qcom_cpr3/thread0' causes cpr3_debug_info_show()
> to crash while trying to read thread->corner->last_uV as
> thread->corner is NULL.
> 
> 	Call trace:
> 		cpr3_debug_info_show
> 		seq_read_iter
> 		seq_read

I'd say, the commit message might be simpler:

IPQ9574 uses CPR4 power domain to manage core supplies. Use
device-specific match data for this platform that includes genpd_names
configuration.

Anyway:

Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>


> 
> Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
> ---
> v4: Update commit log to include stack trace
>     Introduce qcom_cpufreq_match_data for IPQ9574
> ---
>  drivers/cpufreq/qcom-cpufreq-nvmem.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> index 939702dfa73f..95558586c2e6 100644
> --- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> @@ -428,6 +428,11 @@ static const struct qcom_cpufreq_match_data match_data_ipq8074 = {
>  	.get_version = qcom_cpufreq_ipq8074_name_version,
>  };
>  
> +static const struct qcom_cpufreq_match_data match_data_ipq9574 = {
> +	.get_version = qcom_cpufreq_kryo_name_version,
> +	.genpd_names = generic_genpd_names,
> +};
> +
>  static void qcom_cpufreq_suspend_virt_devs(struct qcom_cpufreq_drv *drv, unsigned int cpu)
>  {
>  	const char * const *name = drv->data->genpd_names;
> @@ -621,7 +626,7 @@ static const struct of_device_id qcom_cpufreq_match_list[] __initconst = {
>  	{ .compatible = "qcom,ipq8064", .data = &match_data_ipq8064 },
>  	{ .compatible = "qcom,ipq8074", .data = &match_data_ipq8074 },
>  	{ .compatible = "qcom,apq8064", .data = &match_data_krait },
> -	{ .compatible = "qcom,ipq9574", .data = &match_data_kryo },
> +	{ .compatible = "qcom,ipq9574", .data = &match_data_ipq9574 },
>  	{ .compatible = "qcom,msm8974", .data = &match_data_krait },
>  	{ .compatible = "qcom,msm8960", .data = &match_data_krait },
>  	{},
> -- 
> 2.34.1
>
diff mbox series

Patch

diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
index 939702dfa73f..95558586c2e6 100644
--- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
+++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
@@ -428,6 +428,11 @@  static const struct qcom_cpufreq_match_data match_data_ipq8074 = {
 	.get_version = qcom_cpufreq_ipq8074_name_version,
 };
 
+static const struct qcom_cpufreq_match_data match_data_ipq9574 = {
+	.get_version = qcom_cpufreq_kryo_name_version,
+	.genpd_names = generic_genpd_names,
+};
+
 static void qcom_cpufreq_suspend_virt_devs(struct qcom_cpufreq_drv *drv, unsigned int cpu)
 {
 	const char * const *name = drv->data->genpd_names;
@@ -621,7 +626,7 @@  static const struct of_device_id qcom_cpufreq_match_list[] __initconst = {
 	{ .compatible = "qcom,ipq8064", .data = &match_data_ipq8064 },
 	{ .compatible = "qcom,ipq8074", .data = &match_data_ipq8074 },
 	{ .compatible = "qcom,apq8064", .data = &match_data_krait },
-	{ .compatible = "qcom,ipq9574", .data = &match_data_kryo },
+	{ .compatible = "qcom,ipq9574", .data = &match_data_ipq9574 },
 	{ .compatible = "qcom,msm8974", .data = &match_data_krait },
 	{ .compatible = "qcom,msm8960", .data = &match_data_krait },
 	{},