diff options
Diffstat (limited to 'target/linux/imx6')
| -rw-r--r-- | target/linux/imx6/patches-3.14/0008-ARM-imx-add-speed-grading-check-for-i.mx6-soc.patch | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-3.14/0008-ARM-imx-add-speed-grading-check-for-i.mx6-soc.patch b/target/linux/imx6/patches-3.14/0008-ARM-imx-add-speed-grading-check-for-i.mx6-soc.patch new file mode 100644 index 0000000000..70b7014314 --- /dev/null +++ b/target/linux/imx6/patches-3.14/0008-ARM-imx-add-speed-grading-check-for-i.mx6-soc.patch @@ -0,0 +1,76 @@ +From c962a0996335fae7f79e64677f47d4784b86f692 Mon Sep 17 00:00:00 2001 +From: Anson Huang <b20788@freescale.com> +Date: Wed, 12 Feb 2014 17:57:03 +0800 +Subject: [PATCH] ARM: imx: add speed grading check for i.mx6 soc + +The fuse map of speed_grading[1:0] defines the max speed +of ARM, see below the definition: + +2b'11: 1200000000Hz; +2b'10: 996000000Hz; +2b'01: 852000000Hz; -- i.MX6Q Only, exclusive with 996MHz. +2b'00: 792000000Hz; + +Need to remove all illegal setpoints according to fuse +map. + +Signed-off-by: Anson Huang <b20788@freescale.com> +Signed-off-by: Shawn Guo <shawn.guo@linaro.org> +--- + arch/arm/mach-imx/mach-imx6q.c | 26 +++++++++++++++++++++++--- + 1 file changed, 23 insertions(+), 3 deletions(-) + +--- a/arch/arm/mach-imx/mach-imx6q.c ++++ b/arch/arm/mach-imx/mach-imx6q.c +@@ -219,8 +219,10 @@ static void __init imx6q_init_machine(vo + #define OCOTP_CFG3 0x440 + #define OCOTP_CFG3_SPEED_SHIFT 16 + #define OCOTP_CFG3_SPEED_1P2GHZ 0x3 ++#define OCOTP_CFG3_SPEED_996MHZ 0x2 ++#define OCOTP_CFG3_SPEED_852MHZ 0x1 + +-static void __init imx6q_opp_check_1p2ghz(struct device *cpu_dev) ++static void __init imx6q_opp_check_speed_grading(struct device *cpu_dev) + { + struct device_node *np; + void __iomem *base; +@@ -238,11 +240,29 @@ static void __init imx6q_opp_check_1p2gh + goto put_node; + } + ++ /* ++ * SPEED_GRADING[1:0] defines the max speed of ARM: ++ * 2b'11: 1200000000Hz; ++ * 2b'10: 996000000Hz; ++ * 2b'01: 852000000Hz; -- i.MX6Q Only, exclusive with 996MHz. ++ * 2b'00: 792000000Hz; ++ * We need to set the max speed of ARM according to fuse map. ++ */ + val = readl_relaxed(base + OCOTP_CFG3); + val >>= OCOTP_CFG3_SPEED_SHIFT; +- if ((val & 0x3) != OCOTP_CFG3_SPEED_1P2GHZ) ++ val &= 0x3; ++ ++ if (val != OCOTP_CFG3_SPEED_1P2GHZ) + if (dev_pm_opp_disable(cpu_dev, 1200000000)) + pr_warn("failed to disable 1.2 GHz OPP\n"); ++ if (val < OCOTP_CFG3_SPEED_996MHZ) ++ if (dev_pm_opp_disable(cpu_dev, 996000000)) ++ pr_warn("failed to disable 996 MHz OPP\n"); ++ if (cpu_is_imx6q()) { ++ if (val != OCOTP_CFG3_SPEED_852MHZ) ++ if (dev_pm_opp_disable(cpu_dev, 852000000)) ++ pr_warn("failed to disable 852 MHz OPP\n"); ++ } + + put_node: + of_node_put(np); +@@ -268,7 +288,7 @@ static void __init imx6q_opp_init(void) + goto put_node; + } + +- imx6q_opp_check_1p2ghz(cpu_dev); ++ imx6q_opp_check_speed_grading(cpu_dev); + + put_node: + of_node_put(np); |