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Date: Wed, 14 Jun 2023 16:49:16 +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 17/22] interconnect: qcom: icc-rpm: Control bus rpmcc
from icc
On Wed, Jun 14, 2023 at 12:22:28PM +0200, Konrad Dybcio wrote:
> The sole purpose of bus clocks that were previously registered with
> rpmcc was to convey the aggregated bandwidth to RPM. There's no good
> reason to keep them outside the interconnect framework, as it only
> adds to the plentiful complexity.
>
> Add the required code to handle these clocks from within SMD RPM ICC.
>
> RPM-owned bus clocks are no longer considered a thing, but sadly we
> have to allow for the existence of HLOS-owned bus clocks, as some
> (mostly older) SoCs (ab)use these for bus scaling (e.g. MSM8998 and
> &mmcc AHB_CLK_SRC).
>
> This in turn is trivially solved with a single *clk, which is filled
> and used iff qp.bus_clk_desc is absent and we have a "bus" clock-names
> entry in the DT node.
>
> This change should(tm) be fully compatible with all sorts of old
> Device Trees as far as the interconnect functionality goes (modulo
> abusing bus clock handles or wrongly using the qcom,icc.h binding,
> but that's a mistake in and of itself).
>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
Reviewed-by: Stephan Gerhold <stephan@...hold.net>
Thanks!
> ---
> drivers/interconnect/qcom/icc-rpm.c | 121 ++++++++++++++++++++----------------
> drivers/interconnect/qcom/icc-rpm.h | 13 ++--
> drivers/interconnect/qcom/msm8996.c | 1 -
> drivers/interconnect/qcom/sdm660.c | 1 -
> 4 files changed, 73 insertions(+), 63 deletions(-)
>
> diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
> index b8ecf9538ab9..858880a97d2a 100644
> --- a/drivers/interconnect/qcom/icc-rpm.c
> +++ b/drivers/interconnect/qcom/icc-rpm.c
> @@ -49,7 +49,7 @@
> #define NOC_QOS_MODE_FIXED_VAL 0x0
> #define NOC_QOS_MODE_BYPASS_VAL 0x2
>
> -#define ICC_BUS_CLK_MIN_RATE 19200000ULL
> +#define ICC_BUS_CLK_MIN_RATE 19200ULL /* kHz */
>
> static int qcom_icc_set_qnoc_qos(struct icc_node *src)
> {
> @@ -338,11 +338,10 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
> struct qcom_icc_node *src_qn = NULL, *dst_qn = NULL;
> struct icc_provider *provider;
> u64 sum_bw;
> - u64 rate;
> + u64 active_rate, sleep_rate;
> u64 agg_avg[QCOM_ICC_NUM_BUCKETS], agg_peak[QCOM_ICC_NUM_BUCKETS];
> u64 max_agg_avg;
> - int ret, i;
> - int bucket;
> + int ret;
>
> src_qn = src->data;
> if (dst)
> @@ -364,49 +363,61 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
> return ret;
> }
>
> - for (i = 0; i < qp->num_bus_clks; i++) {
> - /*
> - * Use WAKE bucket for active clock, otherwise, use SLEEP bucket
> - * for other clocks. If a platform doesn't set interconnect
> - * path tags, by default use sleep bucket for all clocks.
> - *
> - * Note, AMC bucket is not supported yet.
> - */
> - if (!strcmp(qp->bus_clks[i].id, "bus_a"))
> - bucket = QCOM_ICC_BUCKET_WAKE;
> - else
> - bucket = QCOM_ICC_BUCKET_SLEEP;
> -
> - rate = icc_units_to_bps(max(agg_avg[bucket], agg_peak[bucket]));
> - do_div(rate, src_qn->buswidth);
> - rate = min_t(u64, rate, LONG_MAX);
> -
> - /*
> - * Downstream checks whether the requested rate is zero, but it makes little sense
> - * to vote for a value that's below the lower threshold, so let's not do so.
> - */
> - if (bucket == QCOM_ICC_BUCKET_WAKE && qp->keep_alive)
> - rate = max(ICC_BUS_CLK_MIN_RATE, rate);
> -
> - if (qp->bus_clk_rate[i] == rate)
> - continue;
> -
> - ret = clk_set_rate(qp->bus_clks[i].clk, rate);
> - if (ret) {
> - pr_err("%s clk_set_rate error: %d\n",
> - qp->bus_clks[i].id, ret);
> + /* Some providers don't have a bus clock to scale */
> + if (!qp->bus_clk_desc && !qp->bus_clk)
> + return 0;
> +
> + /* Intentionally keep the rates in kHz as that's what RPM accepts */
> + active_rate = max(agg_avg[QCOM_SMD_RPM_ACTIVE_STATE],
> + agg_peak[QCOM_SMD_RPM_ACTIVE_STATE]);
> + do_div(active_rate, src_qn->buswidth);
> +
> + sleep_rate = max(agg_avg[QCOM_SMD_RPM_SLEEP_STATE],
> + agg_peak[QCOM_SMD_RPM_SLEEP_STATE]);
> + do_div(sleep_rate, src_qn->buswidth);
> +
> + /*
> + * Downstream checks whether the requested rate is zero, but it makes little sense
> + * to vote for a value that's below the lower threshold, so let's not do so.
> + */
> + if (qp->keep_alive)
> + active_rate = max(ICC_BUS_CLK_MIN_RATE, active_rate);
> +
> + /* Some providers have a non-RPM-owned bus clock - convert kHz->Hz for the CCF */
> + if (qp->bus_clk) {
> + active_rate = max_t(u64, active_rate, sleep_rate);
> + /* ARM32 caps clk_set_rate arg to u32.. Nothing we can do about that! */
> + active_rate = min_t(u64, 1000ULL * active_rate, ULONG_MAX);
> + return clk_set_rate(qp->bus_clk, active_rate);
> + }
> +
> + /* RPM only accepts <=INT_MAX rates */
> + active_rate = min_t(u64, active_rate, INT_MAX);
> + sleep_rate = min_t(u64, sleep_rate, INT_MAX);
> +
> + if (active_rate != qp->bus_clk_rate[QCOM_SMD_RPM_ACTIVE_STATE]) {
> + ret = qcom_icc_rpm_set_bus_rate(qp->bus_clk_desc, QCOM_SMD_RPM_ACTIVE_STATE,
> + active_rate);
> + if (ret)
> return ret;
> - }
> - qp->bus_clk_rate[i] = rate;
> +
> + /* Cache the rate after we've successfully commited it to RPM */
> + qp->bus_clk_rate[QCOM_SMD_RPM_ACTIVE_STATE] = active_rate;
> + }
> +
> + if (sleep_rate != qp->bus_clk_rate[QCOM_SMD_RPM_SLEEP_STATE]) {
> + ret = qcom_icc_rpm_set_bus_rate(qp->bus_clk_desc, QCOM_SMD_RPM_SLEEP_STATE,
> + sleep_rate);
> + if (ret)
> + return ret;
> +
> + /* Cache the rate after we've successfully commited it to RPM */
> + qp->bus_clk_rate[QCOM_SMD_RPM_SLEEP_STATE] = sleep_rate;
> }
>
> return 0;
> }
>
> -static const char * const bus_clocks[] = {
> - "bus", "bus_a",
> -};
> -
> int qnoc_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -448,6 +459,20 @@ int qnoc_probe(struct platform_device *pdev)
> if (!qp->intf_clks)
> return -ENOMEM;
>
> + if (desc->bus_clk_desc) {
> + qp->bus_clk_desc = devm_kzalloc(dev, sizeof(*qp->bus_clk_desc),
> + GFP_KERNEL);
> + if (!qp->bus_clk_desc)
> + return -ENOMEM;
> +
> + qp->bus_clk_desc = desc->bus_clk_desc;
> + } else {
> + /* Some older SoCs may have a single non-RPM-owned bus clock. */
> + qp->bus_clk = devm_clk_get_optional(dev, "bus");
> + if (IS_ERR(qp->bus_clk))
> + return PTR_ERR(qp->bus_clk);
> + }
> +
> data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes),
> GFP_KERNEL);
> if (!data)
> @@ -457,10 +482,6 @@ int qnoc_probe(struct platform_device *pdev)
> for (i = 0; i < cd_num; i++)
> qp->intf_clks[i].id = cds[i];
>
> - qp->num_bus_clks = desc->no_clk_scaling ? 0 : NUM_BUS_CLKS;
> - for (i = 0; i < qp->num_bus_clks; i++)
> - qp->bus_clks[i].id = bus_clocks[i];
> -
> qp->keep_alive = desc->keep_alive;
> qp->type = desc->type;
> qp->qos_offset = desc->qos_offset;
> @@ -490,11 +511,7 @@ int qnoc_probe(struct platform_device *pdev)
> }
>
> regmap_done:
> - ret = devm_clk_bulk_get(dev, qp->num_bus_clks, qp->bus_clks);
> - if (ret)
> - return ret;
> -
> - ret = clk_bulk_prepare_enable(qp->num_bus_clks, qp->bus_clks);
> + ret = clk_prepare_enable(qp->bus_clk);
> if (ret)
> return ret;
>
> @@ -566,7 +583,7 @@ int qnoc_probe(struct platform_device *pdev)
> icc_provider_deregister(provider);
> err_remove_nodes:
> icc_nodes_remove(provider);
> - clk_bulk_disable_unprepare(qp->num_bus_clks, qp->bus_clks);
> + clk_disable_unprepare(qp->bus_clk);
>
> return ret;
> }
> @@ -578,7 +595,7 @@ int qnoc_remove(struct platform_device *pdev)
>
> icc_provider_deregister(&qp->provider);
> icc_nodes_remove(&qp->provider);
> - clk_bulk_disable_unprepare(qp->num_bus_clks, qp->bus_clks);
> + clk_disable_unprepare(qp->bus_clk);
>
> return 0;
> }
> diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
> index 692d91c248d9..d5da24495d14 100644
> --- a/drivers/interconnect/qcom/icc-rpm.h
> +++ b/drivers/interconnect/qcom/icc-rpm.h
> @@ -36,32 +36,29 @@ struct rpm_clk_resource {
> bool branch;
> };
>
> -#define NUM_BUS_CLKS 2
> -
> /**
> * struct qcom_icc_provider - Qualcomm specific interconnect provider
> * @provider: generic interconnect provider
> - * @num_bus_clks: the total number of bus_clks clk_bulk_data entries (0 or 2)
> * @num_intf_clks: the total number of intf_clks clk_bulk_data entries
> * @type: the ICC provider type
> * @regmap: regmap for QoS registers read/write access
> * @qos_offset: offset to QoS registers
> * @bus_clk_rate: bus clock rate in Hz
> - * @bus_clks: the clk_bulk_data table of bus clocks
> + * @bus_clk_desc: a pointer to a rpm_clk_resource description of bus clocks
> + * @bus_clk: a pointer to a HLOS-owned bus clock
> * @intf_clks: a clk_bulk_data array of interface clocks
> * @keep_alive: whether to always keep a minimum vote on the bus clocks
> * @is_on: whether the bus is powered on
> */
> struct qcom_icc_provider {
> struct icc_provider provider;
> - int num_bus_clks;
> int num_intf_clks;
> enum qcom_icc_type type;
> struct regmap *regmap;
> unsigned int qos_offset;
> - u64 bus_clk_rate[NUM_BUS_CLKS];
> - struct clk_bulk_data bus_clks[NUM_BUS_CLKS];
> + u32 bus_clk_rate[QCOM_SMD_RPM_STATE_NUM];
> const struct rpm_clk_resource *bus_clk_desc;
> + struct clk *bus_clk;
> struct clk_bulk_data *intf_clks;
> bool keep_alive;
> bool is_on;
> @@ -118,12 +115,10 @@ struct qcom_icc_node {
> 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;
> - bool no_clk_scaling;
> enum qcom_icc_type type;
> const struct regmap_config *regmap_cfg;
> unsigned int qos_offset;
> diff --git a/drivers/interconnect/qcom/msm8996.c b/drivers/interconnect/qcom/msm8996.c
> index a596f4035d2e..8081b3cb1025 100644
> --- a/drivers/interconnect/qcom/msm8996.c
> +++ b/drivers/interconnect/qcom/msm8996.c
> @@ -1818,7 +1818,6 @@ static const struct qcom_icc_desc msm8996_a0noc = {
> .num_nodes = ARRAY_SIZE(a0noc_nodes),
> .intf_clocks = a0noc_intf_clocks,
> .num_intf_clocks = ARRAY_SIZE(a0noc_intf_clocks),
> - .no_clk_scaling = true,
> .regmap_cfg = &msm8996_a0noc_regmap_config
> };
>
> diff --git a/drivers/interconnect/qcom/sdm660.c b/drivers/interconnect/qcom/sdm660.c
> index 5743ed680e8e..211fa1fa569c 100644
> --- a/drivers/interconnect/qcom/sdm660.c
> +++ b/drivers/interconnect/qcom/sdm660.c
> @@ -1618,7 +1618,6 @@ static const struct qcom_icc_desc sdm660_gnoc = {
> .nodes = sdm660_gnoc_nodes,
> .num_nodes = ARRAY_SIZE(sdm660_gnoc_nodes),
> .regmap_cfg = &sdm660_gnoc_regmap_config,
> - .no_clk_scaling = true,
> };
>
> static struct qcom_icc_node * const sdm660_mnoc_nodes[] = {
>
> --
> 2.41.0
>
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