Re: [PATCH] cpufreq: qcom: Add support for krait based socs

Ilia Lin
2020-03-13T13:52:42Z

See inline.

On Wed, Feb 19, 2020 at 10:56 PM Ansuel Smith <ansuelsmth@gmail.com> wrote:
>
> In Certain QCOM SoCs like ipq8064, apq8064, msm8960, msm8974
> that has KRAIT processors the voltage/current value of each OPP
> varies based on the silicon variant in use.
>
> The required OPP related data is determined based on
> the efuse value. This is similar to the existing code for
> kryo cores. So adding support for krait cores here.
>
> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
> Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
> ---
> .../bindings/opp/qcom-nvmem-cpufreq.txt | 3 +-
> drivers/cpufreq/Kconfig.arm | 2 +-
> drivers/cpufreq/cpufreq-dt-platdev.c | 5 +
> drivers/cpufreq/qcom-cpufreq-nvmem.c | 181 ++++++++++++++++--
> 4 files changed, 173 insertions(+), 18 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt b/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
> index 4751029b9b74..64f07417ecfb 100644
> --- a/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
> +++ b/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
> @@ -19,7 +19,8 @@ In 'cpu' nodes:
>
> In 'operating-points-v2' table:
> - compatible: Should be
> - - 'operating-points-v2-kryo-cpu' for apq8096 and msm8996.
> + - 'operating-points-v2-kryo-cpu' for apq8096, msm8996, msm8974,
> + apq8064, ipq8064, msm8960 and ipq8074.
>
> Optional properties:
> --------------------
> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> index 3858d86cf409..15c1a1231516 100644
> --- a/drivers/cpufreq/Kconfig.arm
> +++ b/drivers/cpufreq/Kconfig.arm
> @@ -128,7 +128,7 @@ config ARM_OMAP2PLUS_CPUFREQ
>
> config ARM_QCOM_CPUFREQ_NVMEM
> tristate "Qualcomm nvmem based CPUFreq"
> - depends on ARM64
> + depends on ARCH_QCOM
> depends on QCOM_QFPROM
> depends on QCOM_SMEM
> select PM_OPP
> diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
> index f2ae9cd455c1..cb9db16bea61 100644
> --- a/drivers/cpufreq/cpufreq-dt-platdev.c
> +++ b/drivers/cpufreq/cpufreq-dt-platdev.c
> @@ -141,6 +141,11 @@ static const struct of_device_id blacklist[] __initconst = {
> { .compatible = "ti,dra7", },
> { .compatible = "ti,omap3", },
>
> + { .compatible = "qcom,ipq8064", },
> + { .compatible = "qcom,apq8064", },
> + { .compatible = "qcom,msm8974", },
> + { .compatible = "qcom,msm8960", },
> +
> { }
> };
>
> diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> index f0d2d5035413..35a616189030 100644
> --- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> @@ -49,12 +49,14 @@ struct qcom_cpufreq_drv;
> struct qcom_cpufreq_match_data {
> int (*get_version)(struct device *cpu_dev,
> struct nvmem_cell *speedbin_nvmem,
> + char **pvs_name,
> struct qcom_cpufreq_drv *drv);
> const char **genpd_names;
> };
>
> struct qcom_cpufreq_drv {
> - struct opp_table **opp_tables;
> + struct opp_table **names_opp_tables;
> + struct opp_table **hw_opp_tables;
> struct opp_table **genpd_opp_tables;
> u32 versions;
> const struct qcom_cpufreq_match_data *data;
> @@ -62,6 +64,81 @@ struct qcom_cpufreq_drv {
>
> static struct platform_device *cpufreq_dt_pdev, *cpufreq_pdev;
>
> +static void get_krait_bin_format_a(struct device *cpu_dev,
> + int *speed, int *pvs, int *pvs_ver,
> + struct nvmem_cell *pvs_nvmem, u8 *buf)
> +{
> + u32 pte_efuse;
> +
> + pte_efuse = *((u32 *)buf);
> +
> + *speed = pte_efuse & 0xf;
> + if (*speed == 0xf)
> + *speed = (pte_efuse >> 4) & 0xf;
> +
> + if (*speed == 0xf) {
> + *speed = 0;
> + dev_warn(cpu_dev, "Speed bin: Defaulting to %d\n", *speed);
> + } else {
> + dev_dbg(cpu_dev, "Speed bin: %d\n", *speed);
> + }
> +
> + *pvs = (pte_efuse >> 10) & 0x7;
> + if (*pvs == 0x7)
> + *pvs = (pte_efuse >> 13) & 0x7;
> +
> + if (*pvs == 0x7) {
> + *pvs = 0;
> + dev_warn(cpu_dev, "PVS bin: Defaulting to %d\n", *pvs);
> + } else {
> + dev_dbg(cpu_dev, "PVS bin: %d\n", *pvs);
> + }
> +}
> +
> +static void get_krait_bin_format_b(struct device *cpu_dev,
> + int *speed, int *pvs, int *pvs_ver,
> + struct nvmem_cell *pvs_nvmem, u8 *buf)
> +{
> + u32 pte_efuse, redundant_sel;
> +
> + pte_efuse = *((u32 *)buf);
> + redundant_sel = (pte_efuse >> 24) & 0x7;
> + *speed = pte_efuse & 0x7;
Why wouldn't you move this into the switch?
> +
> + /* 4 bits of PVS are in efuse register bits 31, 8-6. */
> + *pvs = ((pte_efuse >> 28) & 0x8) | ((pte_efuse >> 6) & 0x7);
> + *pvs_ver = (pte_efuse >> 4) & 0x3;
Same as above.
> +
> + switch (redundant_sel) {
> + case 1:
> + *speed = (pte_efuse >> 27) & 0xf;
> + break;
> + case 2:
> + *pvs = (pte_efuse >> 27) & 0xf;
> + break;
IMHO, it is worth to handle the default case here.
> + }
> +
> + /* Check SPEED_BIN_BLOW_STATUS */
> + if (pte_efuse & BIT(3)) {
> + dev_dbg(cpu_dev, "Speed bin: %d\n", *speed);
> + } else {
> + dev_warn(cpu_dev, "Speed bin not set. Defaulting to 0!\n");
> + *speed = 0;
> + }
> +
> + /* Check PVS_BLOW_STATUS */
> + pte_efuse = *(((u32 *)buf) + 4);
> + pte_efuse &= BIT(21);
> + if (pte_efuse) {
> + dev_dbg(cpu_dev, "PVS bin: %d\n", *pvs);
> + } else {
> + dev_warn(cpu_dev, "PVS bin not set. Defaulting to 0!\n");
> + *pvs = 0;
> + }
> +
> + dev_dbg(cpu_dev, "PVS version: %d\n", *pvs_ver);
> +}
> +
> static enum _msm8996_version qcom_cpufreq_get_msm_id(void)
> {
> size_t len;
> @@ -93,11 +170,13 @@ static enum _msm8996_version qcom_cpufreq_get_msm_id(void)
>
> static int qcom_cpufreq_kryo_name_version(struct device *cpu_dev,
> struct nvmem_cell *speedbin_nvmem,
> + char **pvs_name,
> struct qcom_cpufreq_drv *drv)
> {
> size_t len;
> u8 *speedbin;
> enum _msm8996_version msm8996_version;
> + *pvs_name = NULL;
>
> msm8996_version = qcom_cpufreq_get_msm_id();
> if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
> @@ -125,10 +204,44 @@ static int qcom_cpufreq_kryo_name_version(struct device *cpu_dev,
> return 0;
> }
>
> +static int qcom_cpufreq_krait_name_version(struct device *cpu_dev,
> + struct nvmem_cell *speedbin_nvmem,
> + char **pvs_name,
> + struct qcom_cpufreq_drv *drv)
> +{
> + int speed = 0, pvs = 0, pvs_ver = 0;
> + u8 *speedbin;
> + size_t len;
> +
> + speedbin = nvmem_cell_read(speedbin_nvmem, &len);
> + if (len == 4) {
Preferably doing this with switch-case.
> + get_krait_bin_format_a(cpu_dev, &speed, &pvs, &pvs_ver,
> + speedbin_nvmem, speedbin);
> + } else if (len == 8) {
> + get_krait_bin_format_b(cpu_dev, &speed, &pvs, &pvs_ver,
> + speedbin_nvmem, speedbin);
> + } else {
> + dev_err(cpu_dev, "Unable to read nvmem data. Defaulting to 0!\n");
> + return -ENODEV;
> + }
> +
> + snprintf(*pvs_name, sizeof("speedXX-pvsXX-vXX"), "speed%d-pvs%d-v%d",
> + speed, pvs, pvs_ver);
> +
> + drv->versions = (1 << speed);
> +
> + kfree(speedbin);
> + return 0;
> +}
> +
> static const struct qcom_cpufreq_match_data match_data_kryo = {
> .get_version = qcom_cpufreq_kryo_name_version,
> };
>
> +static const struct qcom_cpufreq_match_data match_data_krait = {
> + .get_version = qcom_cpufreq_krait_name_version,
> +};
> +
> static const char *qcs404_genpd_names[] = { "cpr", NULL };
>
> static const struct qcom_cpufreq_match_data match_data_qcs404 = {
> @@ -141,6 +254,7 @@ static int qcom_cpufreq_probe(struct platform_device *pdev)
> struct nvmem_cell *speedbin_nvmem;
> struct device_node *np;
> struct device *cpu_dev;
> + char *pvs_name = "speedXX-pvsXX-vXX";
> unsigned cpu;
> const struct of_device_id *match;
> int ret;
> @@ -153,7 +267,7 @@ static int qcom_cpufreq_probe(struct platform_device *pdev)
> if (!np)
> return -ENOENT;
>
> - ret = of_device_is_compatible(np, "operating-points-v2-kryo-cpu");
> + ret = of_device_is_compatible(np, "operating-points-v2-qcom-cpu");
> if (!ret) {
> of_node_put(np);
> return -ENOENT;
> @@ -181,7 +295,8 @@ static int qcom_cpufreq_probe(struct platform_device *pdev)
> goto free_drv;
> }
>
> - ret = drv->data->get_version(cpu_dev, speedbin_nvmem, drv);
> + ret = drv->data->get_version(cpu_dev,
> + speedbin_nvmem, &pvs_name, drv);
> if (ret) {
> nvmem_cell_put(speedbin_nvmem);
> goto free_drv;
> @@ -190,12 +305,20 @@ static int qcom_cpufreq_probe(struct platform_device *pdev)
> }
> of_node_put(np);
>
> - drv->opp_tables = kcalloc(num_possible_cpus(), sizeof(*drv->opp_tables),
> + drv->names_opp_tables = kcalloc(num_possible_cpus(),
> + sizeof(*drv->names_opp_tables),
> GFP_KERNEL);
> - if (!drv->opp_tables) {
> + if (!drv->names_opp_tables) {
> ret = -ENOMEM;
> goto free_drv;
> }
> + drv->hw_opp_tables = kcalloc(num_possible_cpus(),
> + sizeof(*drv->hw_opp_tables),
> + GFP_KERNEL);
> + if (!drv->hw_opp_tables) {
> + ret = -ENOMEM;
> + goto free_opp1;
> + }
>
> drv->genpd_opp_tables = kcalloc(num_possible_cpus(),
> sizeof(*drv->genpd_opp_tables),
> @@ -213,11 +336,23 @@ static int qcom_cpufreq_probe(struct platform_device *pdev)
> }
>
> if (drv->data->get_version) {
> - drv->opp_tables[cpu] =
> - dev_pm_opp_set_supported_hw(cpu_dev,
> - &drv->versions, 1);
> - if (IS_ERR(drv->opp_tables[cpu])) {
> - ret = PTR_ERR(drv->opp_tables[cpu]);
> +
> + if (pvs_name) {
> + drv->names_opp_tables[cpu] = dev_pm_opp_set_prop_name(
> + cpu_dev,
> + pvs_name);
> + if (IS_ERR(drv->names_opp_tables[cpu])) {
> + ret = PTR_ERR(drv->names_opp_tables[cpu]);
> + dev_err(cpu_dev, "Failed to add OPP name %s\n",
> + pvs_name);
> + goto free_opp;
> + }
> + }
> +
> + drv->hw_opp_tables[cpu] = dev_pm_opp_set_supported_hw(
> + cpu_dev, &drv->versions, 1);
> + if (IS_ERR(drv->hw_opp_tables[cpu])) {
> + ret = PTR_ERR(drv->hw_opp_tables[cpu]);
> dev_err(cpu_dev,
> "Failed to set supported hardware\n");
> goto free_genpd_opp;
> @@ -259,11 +394,18 @@ static int qcom_cpufreq_probe(struct platform_device *pdev)
> kfree(drv->genpd_opp_tables);
> free_opp:
> for_each_possible_cpu(cpu) {
> - if (IS_ERR_OR_NULL(drv->opp_tables[cpu]))
> + if (IS_ERR_OR_NULL(drv->names_opp_tables[cpu]))
> + break;
> + dev_pm_opp_put_prop_name(drv->names_opp_tables[cpu]);
> + }
> + for_each_possible_cpu(cpu) {
> + if (IS_ERR_OR_NULL(drv->hw_opp_tables[cpu]))
> break;
> - dev_pm_opp_put_supported_hw(drv->opp_tables[cpu]);
> + dev_pm_opp_put_supported_hw(drv->hw_opp_tables[cpu]);
> }
> - kfree(drv->opp_tables);
> + kfree(drv->hw_opp_tables);
> +free_opp1:
Please, use better naming here.
> + kfree(drv->names_opp_tables);
> free_drv:
> kfree(drv);
>
> @@ -278,13 +420,16 @@ static int qcom_cpufreq_remove(struct platform_device *pdev)
> platform_device_unregister(cpufreq_dt_pdev);
>
> for_each_possible_cpu(cpu) {
> - if (drv->opp_tables[cpu])
> - dev_pm_opp_put_supported_hw(drv->opp_tables[cpu]);
> + if (drv->names_opp_tables[cpu])
> + dev_pm_opp_put_supported_hw(drv->names_opp_tables[cpu]);
> + if (drv->hw_opp_tables[cpu])
> + dev_pm_opp_put_supported_hw(drv->hw_opp_tables[cpu]);
> if (drv->genpd_opp_tables[cpu])
> dev_pm_opp_detach_genpd(drv->genpd_opp_tables[cpu]);
> }
>
> - kfree(drv->opp_tables);
> + kfree(drv->names_opp_tables);
> + kfree(drv->hw_opp_tables);
> kfree(drv->genpd_opp_tables);
> kfree(drv);
>
> @@ -303,6 +448,10 @@ static const struct of_device_id qcom_cpufreq_match_list[] __initconst = {
> { .compatible = "qcom,apq8096", .data = &match_data_kryo },
> { .compatible = "qcom,msm8996", .data = &match_data_kryo },
> { .compatible = "qcom,qcs404", .data = &match_data_qcs404 },
> + { .compatible = "qcom,ipq8064", .data = &match_data_krait },
> + { .compatible = "qcom,apq8064", .data = &match_data_krait },
> + { .compatible = "qcom,msm8974", .data = &match_data_krait },
> + { .compatible = "qcom,msm8960", .data = &match_data_krait },
> {},
> };
>
> --
> 2.25.0
>