| Message ID | 1526555955-29960-11-git-send-email-ilialin@codeaurora.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On 17-05-18, 14:19, Ilia Lin wrote: > +static int __init qcom_cpufreq_kryo_driver_init(void) > +{ > + size_t len; > + int ret = 0; > + u32 versions; > + enum _msm8996_version msm8996_version; > + u8 *speedbin; > + struct device *cpu_dev_silver, *cpu_dev_gold; > + struct device_node *np; > + struct nvmem_cell *speedbin_nvmem; > + struct platform_device *pdev; > + struct opp_table *opp_silver = NULL; > + struct opp_table *opp_gold = NULL; No need to initialize them and you may want to arrange all above in decreasing order of their length. > + > + cpu_dev_silver = get_cpu_device(SILVER_LEAD); > + if (IS_ERR_OR_NULL(cpu_dev_silver)) > + return PTR_ERR(cpu_dev_silver); > + > + cpu_dev_gold = get_cpu_device(SILVER_LEAD); > + if (IS_ERR_OR_NULL(cpu_dev_gold)) > + return PTR_ERR(cpu_dev_gold); > + > + msm8996_version = qcom_cpufreq_kryo_get_msm_id(); > + if (NUM_OF_MSM8996_VERSIONS == msm8996_version) { > + dev_err(cpu_dev_silver, "Not Snapdragon 820/821!"); > + return -ENODEV; > + } > + > + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev_silver); > + if (IS_ERR_OR_NULL(np)) > + return PTR_ERR(np); > + > + if (!of_device_is_compatible(np, "operating-points-v2-kryo-cpu")) { > + ret = -ENOENT; > + goto free_np; > + } > + > + speedbin_nvmem = of_nvmem_cell_get(np, NULL); > + if (IS_ERR(speedbin_nvmem)) { > + ret = PTR_ERR(speedbin_nvmem); > + dev_err(cpu_dev_silver, "Could not get nvmem cell: %d\n", ret); > + goto free_np; > + } > + > + speedbin = nvmem_cell_read(speedbin_nvmem, &len); > + nvmem_cell_put(speedbin_nvmem); > + > + switch (msm8996_version) { > + case MSM8996_V3: > + versions = 1 << (unsigned int)(*speedbin); > + break; > + case MSM8996_SG: > + versions = 1 << ((unsigned int)(*speedbin) + 4); > + break; > + default: > + BUG(); > + break; > + } > + > + opp_silver = dev_pm_opp_set_supported_hw(cpu_dev_silver,&versions,1); > + if (IS_ERR_OR_NULL(opp_silver)) { This API doesn't return NULL and so IS_ERR() would be sufficient. > + dev_err(cpu_dev_silver, "Failed to set supported hardware\n"); > + ret = PTR_ERR(opp_silver); > + goto free_np; > + } > + > + opp_gold = dev_pm_opp_set_supported_hw(cpu_dev_gold,&versions,1); > + if (IS_ERR_OR_NULL(opp_gold)) { same here. > + dev_err(cpu_dev_gold, "Failed to set supported hardware\n"); > + ret = PTR_ERR(opp_gold); > + goto free_opp_silver; > + } > + > + pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0); > + if (!IS_ERR_OR_NULL(pdev)) > + goto out; Simply return from here and remove the useless label out. > + > + ret = PTR_ERR(pdev); > + dev_err(cpu_dev_silver, "Failed to register platform device\n"); > + dev_pm_opp_put_supported_hw(opp_gold); > + > +free_opp_silver: > + dev_pm_opp_put_supported_hw(opp_silver); > + > +free_np: > + of_node_put(np); > + > +out: > + return ret; > +} > +late_initcall(qcom_cpufreq_kryo_driver_init); Please resend only this patch now or just paste the new code in a mail here so that I can review it quickly and then you can resend the final version. Most of the patches aren't changing anyway.
Hi Viresh,
If I send patches in reply, it will produce new patches, instead of answers
in the thread. Please find below the file dump.
->cat drivers/cpufreq/qcom-cpufreq-kryo.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018, The Linux Foundation. All rights reserved.
*/
/*
* In Certain QCOM SoCs like apq8096 and msm8996 that have KRYO processors,
* the CPU frequency subset and voltage value of each OPP varies
* based on the silicon variant in use. Qualcomm Process Voltage Scaling
Tables
* defines the voltage and frequency value based on the msm-id in SMEM
* and speedbin blown in the efuse combination.
* The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the
SoC
* to provide the OPP framework with required information.
* This is used to determine the voltage and frequency value for each OPP of
* operating-points-v2 table when it is parsed by the OPP framework.
*/
#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/slab.h>
#include <linux/soc/qcom/smem.h>
#define MSM_ID_SMEM 137
#define SILVER_LEAD 0
#define GOLD_LEAD 2
enum _msm_id {
MSM8996V3 = 0xF6ul,
APQ8096V3 = 0x123ul,
MSM8996SG = 0x131ul,
APQ8096SG = 0x138ul,
};
enum _msm8996_version {
MSM8996_V3,
MSM8996_SG,
NUM_OF_MSM8996_VERSIONS,
};
static enum _msm8996_version __init qcom_cpufreq_kryo_get_msm_id(void)
{
size_t len;
u32 *msm_id;
enum _msm8996_version version;
msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len);
/* The first 4 bytes are format, next to them is the actual msm-id
*/
msm_id++;
switch ((enum _msm_id)*msm_id) {
case MSM8996V3:
case APQ8096V3:
version = MSM8996_V3;
break;
case MSM8996SG:
case APQ8096SG:
version = MSM8996_SG;
break;
default:
version = NUM_OF_MSM8996_VERSIONS;
}
return version;
}
static int __init qcom_cpufreq_kryo_driver_init(void)
{
struct device *cpu_dev_silver, *cpu_dev_gold;
struct opp_table *opp_silver, *opp_gold;
enum _msm8996_version msm8996_version;
struct nvmem_cell *speedbin_nvmem;
struct platform_device *pdev;
struct device_node *np;
u8 *speedbin;
u32 versions;
size_t len;
int ret;
cpu_dev_silver = get_cpu_device(SILVER_LEAD);
if (IS_ERR_OR_NULL(cpu_dev_silver))
return PTR_ERR(cpu_dev_silver);
cpu_dev_gold = get_cpu_device(SILVER_LEAD);
if (IS_ERR_OR_NULL(cpu_dev_gold))
return PTR_ERR(cpu_dev_gold);
msm8996_version = qcom_cpufreq_kryo_get_msm_id();
if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
dev_err(cpu_dev_silver, "Not Snapdragon 820/821!");
return -ENODEV;
}
np = dev_pm_opp_of_get_opp_desc_node(cpu_dev_silver);
if (IS_ERR_OR_NULL(np))
return PTR_ERR(np);
if (!of_device_is_compatible(np, "operating-points-v2-kryo-cpu")) {
ret = -ENOENT;
goto free_np;
}
speedbin_nvmem = of_nvmem_cell_get(np, NULL);
if (IS_ERR(speedbin_nvmem)) {
ret = PTR_ERR(speedbin_nvmem);
dev_err(cpu_dev_silver, "Could not get nvmem cell: %d\n",
ret);
goto free_np;
}
speedbin = nvmem_cell_read(speedbin_nvmem, &len);
nvmem_cell_put(speedbin_nvmem);
switch (msm8996_version) {
case MSM8996_V3:
versions = 1 << (unsigned int)(*speedbin);
break;
case MSM8996_SG:
versions = 1 << ((unsigned int)(*speedbin) + 4);
break;
default:
BUG();
break;
}
opp_silver =
dev_pm_opp_set_supported_hw(cpu_dev_silver,&versions,1);
if (IS_ERR(opp_silver)) {
dev_err(cpu_dev_silver, "Failed to set supported
hardware\n");
ret = PTR_ERR(opp_silver);
goto free_np;
}
opp_gold = dev_pm_opp_set_supported_hw(cpu_dev_gold,&versions,1);
if (IS_ERR(opp_gold)) {
dev_err(cpu_dev_gold, "Failed to set supported hardware\n");
ret = PTR_ERR(opp_gold);
goto free_opp_silver;
}
pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
if (!IS_ERR_OR_NULL(pdev))
return 0;
ret = PTR_ERR(pdev);
dev_err(cpu_dev_silver, "Failed to register platform device\n");
dev_pm_opp_put_supported_hw(opp_gold);
free_opp_silver:
dev_pm_opp_put_supported_hw(opp_silver);
free_np:
of_node_put(np);
return ret;
}
late_initcall(qcom_cpufreq_kryo_driver_init);
MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver");
MODULE_LICENSE("GPL v2");
> -----Original Message-----
> From: Viresh Kumar <viresh.kumar@linaro.org>
> Sent: Friday, May 18, 2018 04:46
> To: Ilia Lin <ilialin@codeaurora.org>
> Cc: mturquette@baylibre.com; sboyd@kernel.org; robh@kernel.org;
> mark.rutland@arm.com; nm@ti.com; lgirdwood@gmail.com;
> broonie@kernel.org; andy.gross@linaro.org; david.brown@linaro.org;
> catalin.marinas@arm.com; will.deacon@arm.com; rjw@rjwysocki.net; linux-
> clk@vger.kernel.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; linux-pm@vger.kernel.org; linux-arm-
> msm@vger.kernel.org; linux-soc@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; rnayak@codeaurora.org;
> amit.kucheria@linaro.org; nicolas.dechesne@linaro.org;
> celster@codeaurora.org; tfinkel@codeaurora.org
> Subject: Re: [PATCH v8 10/15] cpufreq: Add Kryo CPU scaling driver
>
> On 17-05-18, 14:19, Ilia Lin wrote:
> > +static int __init qcom_cpufreq_kryo_driver_init(void)
> > +{
> > + size_t len;
> > + int ret = 0;
> > + u32 versions;
> > + enum _msm8996_version msm8996_version;
> > + u8 *speedbin;
> > + struct device *cpu_dev_silver, *cpu_dev_gold;
> > + struct device_node *np;
> > + struct nvmem_cell *speedbin_nvmem;
> > + struct platform_device *pdev;
> > + struct opp_table *opp_silver = NULL;
> > + struct opp_table *opp_gold = NULL;
>
> No need to initialize them and you may want to arrange all above in
> decreasing order of their length.
>
> > +
> > + cpu_dev_silver = get_cpu_device(SILVER_LEAD);
> > + if (IS_ERR_OR_NULL(cpu_dev_silver))
> > + return PTR_ERR(cpu_dev_silver);
> > +
> > + cpu_dev_gold = get_cpu_device(SILVER_LEAD);
> > + if (IS_ERR_OR_NULL(cpu_dev_gold))
> > + return PTR_ERR(cpu_dev_gold);
> > +
> > + msm8996_version = qcom_cpufreq_kryo_get_msm_id();
> > + if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
> > + dev_err(cpu_dev_silver, "Not Snapdragon 820/821!");
> > + return -ENODEV;
> > + }
> > +
> > + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev_silver);
> > + if (IS_ERR_OR_NULL(np))
> > + return PTR_ERR(np);
> > +
> > + if (!of_device_is_compatible(np, "operating-points-v2-kryo-cpu")) {
> > + ret = -ENOENT;
> > + goto free_np;
> > + }
> > +
> > + speedbin_nvmem = of_nvmem_cell_get(np, NULL);
> > + if (IS_ERR(speedbin_nvmem)) {
> > + ret = PTR_ERR(speedbin_nvmem);
> > + dev_err(cpu_dev_silver, "Could not get nvmem cell: %d\n",
> ret);
> > + goto free_np;
> > + }
> > +
> > + speedbin = nvmem_cell_read(speedbin_nvmem, &len);
> > + nvmem_cell_put(speedbin_nvmem);
> > +
> > + switch (msm8996_version) {
> > + case MSM8996_V3:
> > + versions = 1 << (unsigned int)(*speedbin);
> > + break;
> > + case MSM8996_SG:
> > + versions = 1 << ((unsigned int)(*speedbin) + 4);
> > + break;
> > + default:
> > + BUG();
> > + break;
> > + }
> > +
> > + opp_silver =
> dev_pm_opp_set_supported_hw(cpu_dev_silver,&versions,1);
> > + if (IS_ERR_OR_NULL(opp_silver)) {
>
> This API doesn't return NULL and so IS_ERR() would be sufficient.
>
> > + dev_err(cpu_dev_silver, "Failed to set supported
> hardware\n");
> > + ret = PTR_ERR(opp_silver);
> > + goto free_np;
> > + }
> > +
> > + opp_gold =
> dev_pm_opp_set_supported_hw(cpu_dev_gold,&versions,1);
> > + if (IS_ERR_OR_NULL(opp_gold)) {
>
> same here.
>
> > + dev_err(cpu_dev_gold, "Failed to set supported
> hardware\n");
> > + ret = PTR_ERR(opp_gold);
> > + goto free_opp_silver;
> > + }
> > +
> > + pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
> > + if (!IS_ERR_OR_NULL(pdev))
> > + goto out;
>
> Simply return from here and remove the useless label out.
>
> > +
> > + ret = PTR_ERR(pdev);
> > + dev_err(cpu_dev_silver, "Failed to register platform device\n");
> > + dev_pm_opp_put_supported_hw(opp_gold);
> > +
> > +free_opp_silver:
> > + dev_pm_opp_put_supported_hw(opp_silver);
> > +
> > +free_np:
> > + of_node_put(np);
> > +
> > +out:
> > + return ret;
> > +}
> > +late_initcall(qcom_cpufreq_kryo_driver_init);
>
> Please resend only this patch now or just paste the new code in a mail
here
> so that I can review it quickly and then you can resend the final version.
Most
> of the patches aren't changing anyway.
>
> --
> viresh
On 19-05-18, 14:45, ilialin@codeaurora.org wrote: > Hi Viresh, > > If I send patches in reply, it will produce new patches, instead of answers > in the thread. Please find below the file dump. There is one email from you which appears to be just fine and appears to be in reply to this thread only. Maybe its your email client that screwed it up for you ? Things look good in mutt.
Final version (addressing Russel's comment as well):
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018, The Linux Foundation. All rights reserved.
*/
/*
* In Certain QCOM SoCs like apq8096 and msm8996 that have KRYO processors,
* the CPU frequency subset and voltage value of each OPP varies
* based on the silicon variant in use. Qualcomm Process Voltage Scaling
Tables
* defines the voltage and frequency value based on the msm-id in SMEM
* and speedbin blown in the efuse combination.
* The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the
SoC
* to provide the OPP framework with required information.
* This is used to determine the voltage and frequency value for each OPP of
* operating-points-v2 table when it is parsed by the OPP framework.
*/
#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/slab.h>
#include <linux/soc/qcom/smem.h>
#define MSM_ID_SMEM 137
#define SILVER_LEAD 0
#define GOLD_LEAD 2
enum _msm_id {
MSM8996V3 = 0xF6ul,
APQ8096V3 = 0x123ul,
MSM8996SG = 0x131ul,
APQ8096SG = 0x138ul,
};
enum _msm8996_version {
MSM8996_V3,
MSM8996_SG,
NUM_OF_MSM8996_VERSIONS,
};
static enum _msm8996_version __init qcom_cpufreq_kryo_get_msm_id(void)
{
size_t len;
u32 *msm_id;
enum _msm8996_version version;
msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len);
/* The first 4 bytes are format, next to them is the actual msm-id
*/
msm_id++;
switch ((enum _msm_id)*msm_id) {
case MSM8996V3:
case APQ8096V3:
version = MSM8996_V3;
break;
case MSM8996SG:
case APQ8096SG:
version = MSM8996_SG;
break;
default:
version = NUM_OF_MSM8996_VERSIONS;
}
return version;
}
static int __init qcom_cpufreq_kryo_driver_init(void)
{
struct device *cpu_dev_silver, *cpu_dev_gold;
struct opp_table *opp_silver, *opp_gold;
enum _msm8996_version msm8996_version;
struct nvmem_cell *speedbin_nvmem;
struct platform_device *pdev;
struct device_node *np;
u8 *speedbin;
u32 versions;
size_t len;
int ret;
cpu_dev_silver = get_cpu_device(SILVER_LEAD);
if (NULL == cpu_dev_silver)
return -ENODEV;
cpu_dev_gold = get_cpu_device(SILVER_LEAD);
if (NULL == cpu_dev_gold)
return -ENODEV;
msm8996_version = qcom_cpufreq_kryo_get_msm_id();
if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
dev_err(cpu_dev_silver, "Not Snapdragon 820/821!");
return -ENODEV;
}
np = dev_pm_opp_of_get_opp_desc_node(cpu_dev_silver);
if (IS_ERR(np))
return PTR_ERR(np);
if (!of_device_is_compatible(np, "operating-points-v2-kryo-cpu")) {
ret = -ENOENT;
goto free_np;
}
speedbin_nvmem = of_nvmem_cell_get(np, NULL);
if (IS_ERR(speedbin_nvmem)) {
ret = PTR_ERR(speedbin_nvmem);
dev_err(cpu_dev_silver, "Could not get nvmem cell: %d\n",
ret);
goto free_np;
}
speedbin = nvmem_cell_read(speedbin_nvmem, &len);
nvmem_cell_put(speedbin_nvmem);
switch (msm8996_version) {
case MSM8996_V3:
versions = 1 << (unsigned int)(*speedbin);
break;
case MSM8996_SG:
versions = 1 << ((unsigned int)(*speedbin) + 4);
break;
default:
BUG();
break;
}
opp_silver =
dev_pm_opp_set_supported_hw(cpu_dev_silver,&versions,1);
if (IS_ERR(opp_silver)) {
dev_err(cpu_dev_silver, "Failed to set supported
hardware\n");
ret = PTR_ERR(opp_silver);
goto free_np;
}
opp_gold = dev_pm_opp_set_supported_hw(cpu_dev_gold,&versions,1);
if (IS_ERR(opp_gold)) {
dev_err(cpu_dev_gold, "Failed to set supported hardware\n");
ret = PTR_ERR(opp_gold);
goto free_opp_silver;
}
pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
if (!IS_ERR(pdev))
return 0;
ret = PTR_ERR(pdev);
dev_err(cpu_dev_silver, "Failed to register platform device\n");
dev_pm_opp_put_supported_hw(opp_gold);
free_opp_silver:
dev_pm_opp_put_supported_hw(opp_silver);
free_np:
of_node_put(np);
return ret;
}
late_initcall(qcom_cpufreq_kryo_driver_init);
MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver");
MODULE_LICENSE("GPL v2");
> -----Original Message-----
> From: Viresh Kumar <viresh.kumar@linaro.org>
> Sent: Monday, May 21, 2018 07:50
> To: ilialin@codeaurora.org
> Cc: mturquette@baylibre.com; sboyd@kernel.org; robh@kernel.org;
> mark.rutland@arm.com; nm@ti.com; lgirdwood@gmail.com;
> broonie@kernel.org; andy.gross@linaro.org; david.brown@linaro.org;
> catalin.marinas@arm.com; will.deacon@arm.com; rjw@rjwysocki.net; linux-
> clk@vger.kernel.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; linux-pm@vger.kernel.org; linux-arm-
> msm@vger.kernel.org; linux-soc@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; rnayak@codeaurora.org;
> amit.kucheria@linaro.org; nicolas.dechesne@linaro.org;
> celster@codeaurora.org; tfinkel@codeaurora.org
> Subject: Re: [PATCH v8 10/15] cpufreq: Add Kryo CPU scaling driver
>
> On 19-05-18, 14:45, ilialin@codeaurora.org wrote:
> > Hi Viresh,
> >
> > If I send patches in reply, it will produce new patches, instead of
> > answers in the thread. Please find below the file dump.
>
> There is one email from you which appears to be just fine and appears to
be
> in reply to this thread only. Maybe its your email client that screwed it
up for
> you ? Things look good in mutt.
>
> --
> viresh
On 21-05-18, 12:00, ilialin@codeaurora.org wrote:
> Final version (addressing Russel's comment as well):
Sorry, can't review it like this. At least you should be posting your
diff here and you also need to do that from a sane email client like
mutt, which wouldn't auto-fix/update the code. Doing it from gmail or
thunderbird will ofcourse screw it.
Or a simple way is to send the patch again (alone) using in-reply-to
field.
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm index de55c7d..0bfd40e 100644 --- a/drivers/cpufreq/Kconfig.arm +++ b/drivers/cpufreq/Kconfig.arm @@ -124,6 +124,16 @@ config ARM_OMAP2PLUS_CPUFREQ depends on ARCH_OMAP2PLUS default ARCH_OMAP2PLUS +config ARM_QCOM_CPUFREQ_KRYO + bool "Qualcomm Kryo based CPUFreq" + depends on QCOM_QFPROM + depends on QCOM_SMEM + select PM_OPP + help + This adds the CPUFreq driver for Qualcomm Kryo SoC based boards. + + If in doubt, say N. + config ARM_S3C_CPUFREQ bool help diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index 8d24ade..fb4a2ec 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -65,6 +65,7 @@ obj-$(CONFIG_MACH_MVEBU_V7) += mvebu-cpufreq.o obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o obj-$(CONFIG_ARM_PXA2xx_CPUFREQ) += pxa2xx-cpufreq.o obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o +obj-$(CONFIG_ARM_QCOM_CPUFREQ_KRYO) += qcom-cpufreq-kryo.o obj-$(CONFIG_ARM_S3C2410_CPUFREQ) += s3c2410-cpufreq.o obj-$(CONFIG_ARM_S3C2412_CPUFREQ) += s3c2412-cpufreq.o obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c index 3b585e4..77d6ab8 100644 --- a/drivers/cpufreq/cpufreq-dt-platdev.c +++ b/drivers/cpufreq/cpufreq-dt-platdev.c @@ -118,6 +118,9 @@ { .compatible = "nvidia,tegra124", }, + { .compatible = "qcom,apq8096", }, + { .compatible = "qcom,msm8996", }, + { .compatible = "st,stih407", }, { .compatible = "st,stih410", }, diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c new file mode 100644 index 0000000..a2b9fb2 --- /dev/null +++ b/drivers/cpufreq/qcom-cpufreq-kryo.c @@ -0,0 +1,166 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018, The Linux Foundation. All rights reserved. + */ + +/* + * In Certain QCOM SoCs like apq8096 and msm8996 that have KRYO processors, + * the CPU frequency subset and voltage value of each OPP varies + * based on the silicon variant in use. Qualcomm Process Voltage Scaling Tables + * defines the voltage and frequency value based on the msm-id in SMEM + * and speedbin blown in the efuse combination. + * The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the SoC + * to provide the OPP framework with required information. + * This is used to determine the voltage and frequency value for each OPP of + * operating-points-v2 table when it is parsed by the OPP framework. + */ + +#include <linux/cpu.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/nvmem-consumer.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_opp.h> +#include <linux/slab.h> +#include <linux/soc/qcom/smem.h> + +#define MSM_ID_SMEM 137 +#define SILVER_LEAD 0 +#define GOLD_LEAD 2 + +enum _msm_id { + MSM8996V3 = 0xF6ul, + APQ8096V3 = 0x123ul, + MSM8996SG = 0x131ul, + APQ8096SG = 0x138ul, +}; + +enum _msm8996_version { + MSM8996_V3, + MSM8996_SG, + NUM_OF_MSM8996_VERSIONS, +}; + +static enum _msm8996_version __init qcom_cpufreq_kryo_get_msm_id(void) +{ + size_t len; + u32 *msm_id; + enum _msm8996_version version; + + msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len); + /* The first 4 bytes are format, next to them is the actual msm-id */ + msm_id++; + + switch ((enum _msm_id)*msm_id) { + case MSM8996V3: + case APQ8096V3: + version = MSM8996_V3; + break; + case MSM8996SG: + case APQ8096SG: + version = MSM8996_SG; + break; + default: + version = NUM_OF_MSM8996_VERSIONS; + } + + return version; +} + +static int __init qcom_cpufreq_kryo_driver_init(void) +{ + size_t len; + int ret = 0; + u32 versions; + enum _msm8996_version msm8996_version; + u8 *speedbin; + struct device *cpu_dev_silver, *cpu_dev_gold; + struct device_node *np; + struct nvmem_cell *speedbin_nvmem; + struct platform_device *pdev; + struct opp_table *opp_silver = NULL; + struct opp_table *opp_gold = NULL; + + cpu_dev_silver = get_cpu_device(SILVER_LEAD); + if (IS_ERR_OR_NULL(cpu_dev_silver)) + return PTR_ERR(cpu_dev_silver); + + cpu_dev_gold = get_cpu_device(SILVER_LEAD); + if (IS_ERR_OR_NULL(cpu_dev_gold)) + return PTR_ERR(cpu_dev_gold); + + msm8996_version = qcom_cpufreq_kryo_get_msm_id(); + if (NUM_OF_MSM8996_VERSIONS == msm8996_version) { + dev_err(cpu_dev_silver, "Not Snapdragon 820/821!"); + return -ENODEV; + } + + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev_silver); + if (IS_ERR_OR_NULL(np)) + return PTR_ERR(np); + + if (!of_device_is_compatible(np, "operating-points-v2-kryo-cpu")) { + ret = -ENOENT; + goto free_np; + } + + speedbin_nvmem = of_nvmem_cell_get(np, NULL); + if (IS_ERR(speedbin_nvmem)) { + ret = PTR_ERR(speedbin_nvmem); + dev_err(cpu_dev_silver, "Could not get nvmem cell: %d\n", ret); + goto free_np; + } + + speedbin = nvmem_cell_read(speedbin_nvmem, &len); + nvmem_cell_put(speedbin_nvmem); + + switch (msm8996_version) { + case MSM8996_V3: + versions = 1 << (unsigned int)(*speedbin); + break; + case MSM8996_SG: + versions = 1 << ((unsigned int)(*speedbin) + 4); + break; + default: + BUG(); + break; + } + + opp_silver = dev_pm_opp_set_supported_hw(cpu_dev_silver,&versions,1); + if (IS_ERR_OR_NULL(opp_silver)) { + dev_err(cpu_dev_silver, "Failed to set supported hardware\n"); + ret = PTR_ERR(opp_silver); + goto free_np; + } + + opp_gold = dev_pm_opp_set_supported_hw(cpu_dev_gold,&versions,1); + if (IS_ERR_OR_NULL(opp_gold)) { + dev_err(cpu_dev_gold, "Failed to set supported hardware\n"); + ret = PTR_ERR(opp_gold); + goto free_opp_silver; + } + + pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0); + if (!IS_ERR_OR_NULL(pdev)) + goto out; + + ret = PTR_ERR(pdev); + dev_err(cpu_dev_silver, "Failed to register platform device\n"); + dev_pm_opp_put_supported_hw(opp_gold); + +free_opp_silver: + dev_pm_opp_put_supported_hw(opp_silver); + +free_np: + of_node_put(np); + +out: + return ret; +} +late_initcall(qcom_cpufreq_kryo_driver_init); + +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver"); +MODULE_LICENSE("GPL v2");