diff options
| author | Ranjani Vaidyanathan <ra5478@freescale.com> | 2012-02-07 14:34:13 -0600 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2012-07-20 13:36:15 +0800 |
| commit | e49e91034281133c9871a9fe6a1ed2864a947765 (patch) | |
| tree | 3dab4075e6c6807d9cc2d03307ad4e77cf2d30d9 /arch/arm/mach-mx6/devices-imx6q.h | |
| parent | 6079ec044048b2f50f53a22c48df84e123d24535 (diff) | |
ENGR00179574: MX6- Add bus frequency scaling support
Add support for scaling the bus frequency (both DDR
and ahb_clk).
The DDR and AHB_CLK are dropped to 24MHz when all devices
that need high AHB frequency are disabled and the CORE
frequency is at the lowest setpoint.
The DDR is dropped to 400MHz for the video playback usecase.
In this mode the GPU, FEC, SATA etc are disabled.
To scale the bus frequency, its necessary that all cores
except the core that is executing the DDR frequency change
are in WFE. This is achieved by generating interrupts on
un-used interrupts (Int no 139, 144, 145 and 146).
Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
Diffstat (limited to 'arch/arm/mach-mx6/devices-imx6q.h')
| -rw-r--r-- | arch/arm/mach-mx6/devices-imx6q.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mach-mx6/devices-imx6q.h b/arch/arm/mach-mx6/devices-imx6q.h index df5e72cc7910..2c3e0c53ac06 100644 --- a/arch/arm/mach-mx6/devices-imx6q.h +++ b/arch/arm/mach-mx6/devices-imx6q.h @@ -213,3 +213,6 @@ extern const struct imx_vdoa_data imx6q_vdoa_data __initconst; extern const struct imx_pcie_data imx6q_pcie_data __initconst; #define imx6q_add_pcie(pdata) imx_add_pcie(&imx6q_pcie_data, pdata) + +#define imx6q_add_busfreq(pdata) imx_add_busfreq(pdata) + |