Re: [PATCH v5 08/22] interconnect: qcom: smd-rpm: Add rpmcc handling skeleton code

[Konrad Dybcio <konrad.dybcio@linaro.org>]

On 14.06.2023 16:47, Stephan Gerhold wrote:
> On Wed, Jun 14, 2023 at 12:22:19PM +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@linaro.org>
>> ---
>>  drivers/interconnect/qcom/icc-rpm.h | 15 +++++++++++++++
>>  drivers/interconnect/qcom/smd-rpm.c | 21 +++++++++++++++++++++
>>  2 files changed, 36 insertions(+)
>>
>> diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
>> index 9ec90e13bfbd..d857fb1efb75 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, int rsc_type, u32 rate);
>>  
>>  #endif
>> diff --git a/drivers/interconnect/qcom/smd-rpm.c b/drivers/interconnect/qcom/smd-rpm.c
>> index b0183262ba66..b06374340eeb 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 +45,26 @@ 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, int rsc_type, u32 rate)
>> +{
>> +	struct clk_smd_rpm_req req = {
>> +		.key = cpu_to_le32(QCOM_RPM_SMD_KEY_RATE),
>> +		.nbytes = cpu_to_le32(sizeof(u32)),
>> +	};
>> +
>> +	/* Branch clocks are only on/off */
>> +	if (clk->branch)
>> +		rate = !!rate;
>> +
>> +	req.value = cpu_to_le32(rate);
>> +	return qcom_rpm_smd_write(icc_smd_rpm,
>> +				  rsc_type,
>> +				  clk->resource_type,
> 
> Sorry to have more minor comments but as you can see here the resource
> type is taken from the rpm_clk_resource. The parameter that you are
> describing as "rsc_type" is actually the "ctx" in the other function. :')
Meh I fixed it too fast.. thanks

Konrad
> 
> If you fix this feel free to add my:
> 
> Reviewed-by: Stephan Gerhold <stephan@gerhold.net>
> 
> Thanks,
> Stephan