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| author |   Anson Huang <b20788@freescale.com> | 2014-02-12 17:57:03 +0800 |
|---|---|---|
| committer |   Shawn Guo <shawn.guo@linaro.org> | 2014-03-05 10:35:22 +0800 |
| commit | c962a0996335fae7f79e64677f47d4784b86f692 (patch) | |
| tree | 350dd1ec2dd2322b22b08a348d07700c36168bf4 /arch/arm/mach-imx/mach-imx6q.c | |
| parent | ARM: imx: avoid calling clk APIs in idle thread which may cause schedule (diff) | |
| download | linux-dev-c962a0996335fae7f79e64677f47d4784b86f692.tar.xz linux-dev-c962a0996335fae7f79e64677f47d4784b86f692.zip | |
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>
Diffstat (limited to 'arch/arm/mach-imx/mach-imx6q.c')
| -rw-r--r-- | arch/arm/mach-imx/mach-imx6q.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c index d131499be5d3..1e126853847c 100644 --- a/arch/arm/mach-imx/mach-imx6q.c +++ b/arch/arm/mach-imx/mach-imx6q.c @@ -253,8 +253,10 @@ static void __init imx6q_init_machine(void) #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; @@ -272,11 +274,29 @@ static void __init imx6q_opp_check_1p2ghz(struct device *cpu_dev) 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); @@ -302,7 +322,7 @@ 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); |