diff options
Diffstat (limited to 'recipes-kernel/linux/linux-yocto/generic-drivers/icc/0001-interconnect-qcom-icc-rpm-Add-AB-IB-calculations-coe.patch')
| -rw-r--r-- | recipes-kernel/linux/linux-yocto/generic-drivers/icc/0001-interconnect-qcom-icc-rpm-Add-AB-IB-calculations-coe.patch | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-yocto/generic-drivers/icc/0001-interconnect-qcom-icc-rpm-Add-AB-IB-calculations-coe.patch b/recipes-kernel/linux/linux-yocto/generic-drivers/icc/0001-interconnect-qcom-icc-rpm-Add-AB-IB-calculations-coe.patch new file mode 100644 index 0000000..6b8e76f --- /dev/null +++ b/recipes-kernel/linux/linux-yocto/generic-drivers/icc/0001-interconnect-qcom-icc-rpm-Add-AB-IB-calculations-coe.patch @@ -0,0 +1,97 @@ +From dd014803f260b337daaabcde259daf70d5b26b5e Mon Sep 17 00:00:00 2001 +From: Konrad Dybcio <konrad.dybcio@linaro.org> +Date: Fri, 25 Aug 2023 17:38:23 +0200 +Subject: [PATCH 1/9] interconnect: qcom: icc-rpm: Add AB/IB calculations + coefficients + +Presumably due to the hardware being so complex, some nodes (or busses) +have different (usually higher) requirements for bandwidth than what +the usual calculations would suggest. + +Looking at the available downstream files, it seems like AB values are +adjusted per-bus and IB values are adjusted per-node. +With that in mind, introduce percentage-based coefficient struct members +and use them in the calculations. + +One thing to note is that the IB coefficient is inverse (100/ib_percent) +which feels a bit backwards, but it's necessary for precision.. + +Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org> +Link: https://lore.kernel.org/r/20230726-topic-icc_coeff-v4-1-c04b60caa467@linaro.org +Signed-off-by: Georgi Djakov <djakov@kernel.org> +Upstream-Status: Backport [https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git dd014803f260] +--- + drivers/interconnect/qcom/icc-rpm.c | 18 +++++++++++++++--- + drivers/interconnect/qcom/icc-rpm.h | 6 ++++++ + 2 files changed, 21 insertions(+), 3 deletions(-) + +diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c +index 2c16917ba1fd..8b02aa8aa96a 100644 +--- a/drivers/interconnect/qcom/icc-rpm.c ++++ b/drivers/interconnect/qcom/icc-rpm.c +@@ -298,7 +298,8 @@ static int qcom_icc_bw_aggregate(struct icc_node *node, u32 tag, u32 avg_bw, + */ + static void qcom_icc_bus_aggregate(struct icc_provider *provider, u64 *agg_clk_rate) + { +- u64 agg_avg_rate, agg_rate; ++ struct qcom_icc_provider *qp = to_qcom_provider(provider); ++ u64 agg_avg_rate, agg_peak_rate, agg_rate; + struct qcom_icc_node *qn; + struct icc_node *node; + int i; +@@ -315,8 +316,19 @@ static void qcom_icc_bus_aggregate(struct icc_provider *provider, u64 *agg_clk_r + else + agg_avg_rate = qn->sum_avg[i]; + +- agg_rate = max_t(u64, agg_avg_rate, qn->max_peak[i]); +- do_div(agg_rate, qn->buswidth); ++ if (qp->ab_coeff) { ++ agg_avg_rate = agg_avg_rate * qp->ab_coeff; ++ agg_avg_rate = div_u64(agg_avg_rate, 100); ++ } ++ ++ if (qp->ib_coeff) { ++ agg_peak_rate = qn->max_peak[i] * 100; ++ agg_peak_rate = div_u64(qn->max_peak[i], qp->ib_coeff); ++ } else { ++ agg_peak_rate = qn->max_peak[i]; ++ } ++ ++ agg_rate = max_t(u64, agg_avg_rate, agg_peak_rate); + + agg_clk_rate[i] = max_t(u64, agg_clk_rate[i], agg_rate); + } +diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h +index eed3451af3e6..5e7d6a4fd2f3 100644 +--- a/drivers/interconnect/qcom/icc-rpm.h ++++ b/drivers/interconnect/qcom/icc-rpm.h +@@ -44,6 +44,8 @@ struct rpm_clk_resource { + * @type: the ICC provider type + * @regmap: regmap for QoS registers read/write access + * @qos_offset: offset to QoS registers ++ * @ab_coeff: a percentage-based coefficient for compensating the AB calculations ++ * @ib_coeff: an inverse-percentage-based coefficient for compensating the IB calculations + * @bus_clk_rate: bus clock rate in Hz + * @bus_clk_desc: a pointer to a rpm_clk_resource description of bus clocks + * @bus_clk: a pointer to a HLOS-owned bus clock +@@ -57,6 +59,8 @@ struct qcom_icc_provider { + enum qcom_icc_type type; + struct regmap *regmap; + unsigned int qos_offset; ++ u16 ab_coeff; ++ u16 ib_coeff; + u32 bus_clk_rate[QCOM_SMD_RPM_STATE_NUM]; + const struct rpm_clk_resource *bus_clk_desc; + struct clk *bus_clk; +@@ -123,6 +127,8 @@ struct qcom_icc_desc { + enum qcom_icc_type type; + const struct regmap_config *regmap_cfg; + unsigned int qos_offset; ++ u16 ab_coeff; ++ u16 ib_coeff; + }; + + /* Valid for all bus types */ +-- +2.39.2 + |