linux-kernel - Re: [PATCH v4 08/22] interconnect: qcom: smd-rpm: Add rpmcc handling skeleton code

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Date:   Wed, 14 Jun 2023 00:41:03 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Leo Yan <leo.yan@...aro.org>,
        Evan Green <evgreen@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 08/22] interconnect: qcom: smd-rpm: Add rpmcc handling
 skeleton code



On 13.06.2023 22:10, Stephan Gerhold wrote:
> On Tue, Jun 13, 2023 at 04:03:08PM +0200, Konrad Dybcio wrote:
>> Introduce qcom_icc_rpm_set_bus_rate() in preparation for handling RPM
>> clock resources within the interconnect framework. This lets us greatly
>> simplify all of the code handling, as setting the rate comes down to:
>>
>> u32 rate_khz = max(clk.sleep_rate, clk.active_rate, clk_a.active_rate)
>> write_to_rpm(clock.description, rate_khz);
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  drivers/interconnect/qcom/icc-rpm.h | 15 +++++++++++++++
>>  drivers/interconnect/qcom/smd-rpm.c | 22 ++++++++++++++++++++++
>>  2 files changed, 37 insertions(+)
>>
>> diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
>> index 9ec90e13bfbd..13ca0818ffbd 100644
>> --- a/drivers/interconnect/qcom/icc-rpm.h
>> +++ b/drivers/interconnect/qcom/icc-rpm.h
>> @@ -22,6 +22,18 @@ enum qcom_icc_type {
>>  	QCOM_ICC_QNOC,
>>  };
>>  
>> +/**
>> + * struct rpm_clk_resource - RPM bus clock resource
>> + * @resource_type: RPM resource type of the clock resource
>> + * @clock_id: index of the clock resource of a specific resource type
>> + * @branch: whether the resource represents a branch clock
>> +*/
>> +struct rpm_clk_resource {
>> +	u32 resource_type;
>> +	u32 clock_id;
>> +	bool branch;
>> +};
>> +
>>  #define NUM_BUS_CLKS	2
>>  
>>  /**
>> @@ -47,6 +59,7 @@ struct qcom_icc_provider {
>>  	unsigned int qos_offset;
>>  	u64 bus_clk_rate[NUM_BUS_CLKS];
>>  	struct clk_bulk_data bus_clks[NUM_BUS_CLKS];
>> +	const struct rpm_clk_resource *bus_clk_desc;
>>  	struct clk_bulk_data *intf_clks;
>>  	bool keep_alive;
>>  	bool is_on;
>> @@ -104,6 +117,7 @@ struct qcom_icc_desc {
>>  	struct qcom_icc_node * const *nodes;
>>  	size_t num_nodes;
>>  	const char * const *bus_clocks;
>> +	const struct rpm_clk_resource *bus_clk_desc;
>>  	const char * const *intf_clocks;
>>  	size_t num_intf_clocks;
>>  	bool keep_alive;
>> @@ -125,5 +139,6 @@ int qnoc_remove(struct platform_device *pdev);
>>  
>>  bool qcom_icc_rpm_smd_available(void);
>>  int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val);
>> +int qcom_icc_rpm_set_bus_rate(const struct rpm_clk_resource *clk, u32 rate, bool set_active);
>>  
>>  #endif
>> diff --git a/drivers/interconnect/qcom/smd-rpm.c b/drivers/interconnect/qcom/smd-rpm.c
>> index b0183262ba66..c5ab00051447 100644
>> --- a/drivers/interconnect/qcom/smd-rpm.c
>> +++ b/drivers/interconnect/qcom/smd-rpm.c
>> @@ -16,6 +16,7 @@
>>  #include "icc-rpm.h"
>>  
>>  #define RPM_KEY_BW		0x00007762
>> +#define QCOM_RPM_SMD_KEY_RATE	0x007a484b
>>  
>>  static struct qcom_smd_rpm *icc_smd_rpm;
>>  
>> @@ -44,6 +45,27 @@ int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val)
>>  }
>>  EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_send);
>>  
>> +int qcom_icc_rpm_set_bus_rate(const struct rpm_clk_resource *clk, u32 rate, bool set_active)
>> +{
>> +	int state = set_active ? QCOM_SMD_RPM_ACTIVE_STATE : QCOM_SMD_RPM_SLEEP_STATE;
> 
> Why not just pass in the ctx/state directly as parameter instead of this
> boolean? That's what the function directly above does.
Ooohh.. obviously...

Konrad
> 
> Thanks,
> Stephan