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

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Date:   Wed, 14 Jun 2023 16:47:09 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
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 v5 08/22] interconnect: qcom: smd-rpm: Add rpmcc handling
 skeleton code

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@...aro.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. :')

If you fix this feel free to add my:

Reviewed-by: Stephan Gerhold <stephan@...hold.net>

Thanks,
Stephan