diff options
Diffstat (limited to 'bsp/meta-freescale-3rdparty/recipes-kernel/linux/linux-fslc-lts-4.19/ccimx6ul/0002-cpufreq-imx6q-read-OCOTP-through-nvmem-for-imx6ul-im.patch')
| -rw-r--r-- | bsp/meta-freescale-3rdparty/recipes-kernel/linux/linux-fslc-lts-4.19/ccimx6ul/0002-cpufreq-imx6q-read-OCOTP-through-nvmem-for-imx6ul-im.patch | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/bsp/meta-freescale-3rdparty/recipes-kernel/linux/linux-fslc-lts-4.19/ccimx6ul/0002-cpufreq-imx6q-read-OCOTP-through-nvmem-for-imx6ul-im.patch b/bsp/meta-freescale-3rdparty/recipes-kernel/linux/linux-fslc-lts-4.19/ccimx6ul/0002-cpufreq-imx6q-read-OCOTP-through-nvmem-for-imx6ul-im.patch new file mode 100644 index 00000000..26f6ba89 --- /dev/null +++ b/bsp/meta-freescale-3rdparty/recipes-kernel/linux/linux-fslc-lts-4.19/ccimx6ul/0002-cpufreq-imx6q-read-OCOTP-through-nvmem-for-imx6ul-im.patch @@ -0,0 +1,113 @@ +From: Anson Huang <Anson.Huang@nxp.com> +Date: Mon, 8 Oct 2018 14:07:34 +0800 +Subject: [PATCH] cpufreq: imx6q: read OCOTP through nvmem for imx6ul/imx6ull + +On i.MX6UL/i.MX6ULL, accessing OCOTP directly is wrong because +the ocotp clock needs to be enabled first. Add support for reading +OCOTP through the nvmem API, and keep the old method there to +support old dtb. + +Signed-off-by: Anson Huang <Anson.Huang@nxp.com> +Acked-by: Viresh Kumar <viresh.kumar@linaro.org> +Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> +(cherry picked from commit 2733fb0d0699246711cf622e0e2faf02a05b69dc) +--- + drivers/cpufreq/imx6q-cpufreq.c | 52 +++++++++++++++++++++++++++-------------- + 1 file changed, 35 insertions(+), 17 deletions(-) + +diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c +index b2ff423ad7f8..8cfee0ab804b 100644 +--- a/drivers/cpufreq/imx6q-cpufreq.c ++++ b/drivers/cpufreq/imx6q-cpufreq.c +@@ -12,6 +12,7 @@ + #include <linux/cpu_cooling.h> + #include <linux/err.h> + #include <linux/module.h> ++#include <linux/nvmem-consumer.h> + #include <linux/of.h> + #include <linux/of_address.h> + #include <linux/pm_opp.h> +@@ -290,20 +291,32 @@ static void imx6q_opp_check_speed_grading(struct device *dev) + #define OCOTP_CFG3_6ULL_SPEED_792MHZ 0x2 + #define OCOTP_CFG3_6ULL_SPEED_900MHZ 0x3 + +-static void imx6ul_opp_check_speed_grading(struct device *dev) ++static int imx6ul_opp_check_speed_grading(struct device *dev) + { +- struct device_node *np; +- void __iomem *base; + u32 val; ++ int ret = 0; + +- np = of_find_compatible_node(NULL, NULL, "fsl,imx6ul-ocotp"); +- if (!np) +- return; ++ if (of_find_property(dev->of_node, "nvmem-cells", NULL)) { ++ ret = nvmem_cell_read_u32(dev, "speed_grade", &val); ++ if (ret) ++ return ret; ++ } else { ++ struct device_node *np; ++ void __iomem *base; ++ ++ np = of_find_compatible_node(NULL, NULL, "fsl,imx6ul-ocotp"); ++ if (!np) ++ return -ENOENT; ++ ++ base = of_iomap(np, 0); ++ of_node_put(np); ++ if (!base) { ++ dev_err(dev, "failed to map ocotp\n"); ++ return -EFAULT; ++ } + +- base = of_iomap(np, 0); +- if (!base) { +- dev_err(dev, "failed to map ocotp\n"); +- goto put_node; ++ val = readl_relaxed(base + OCOTP_CFG3); ++ iounmap(base); + } + + /* +@@ -314,7 +327,6 @@ static void imx6ul_opp_check_speed_grading(struct device *dev) + * 2b'11: 900000000Hz on i.MX6ULL only; + * We need to set the max speed of ARM according to fuse map. + */ +- val = readl_relaxed(base + OCOTP_CFG3); + val >>= OCOTP_CFG3_SPEED_SHIFT; + val &= 0x3; + +@@ -334,9 +346,7 @@ static void imx6ul_opp_check_speed_grading(struct device *dev) + dev_warn(dev, "failed to disable 900MHz OPP\n"); + } + +- iounmap(base); +-put_node: +- of_node_put(np); ++ return ret; + } + + static int imx6q_cpufreq_probe(struct platform_device *pdev) +@@ -394,10 +404,18 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev) + } + + if (of_machine_is_compatible("fsl,imx6ul") || +- of_machine_is_compatible("fsl,imx6ull")) +- imx6ul_opp_check_speed_grading(cpu_dev); +- else ++ of_machine_is_compatible("fsl,imx6ull")) { ++ ret = imx6ul_opp_check_speed_grading(cpu_dev); ++ if (ret == -EPROBE_DEFER) ++ return ret; ++ if (ret) { ++ dev_err(cpu_dev, "failed to read ocotp: %d\n", ++ ret); ++ return ret; ++ } ++ } else { + imx6q_opp_check_speed_grading(cpu_dev); ++ } + + /* Because we have added the OPPs here, we must free them */ + free_opp = true; |