diff options
author | Jacky Cheung <jacky.cheung@ti.com> | 2012-02-24 13:55:11 -0800 |
---|---|---|
committer | Jacky Cheung <jacky.cheung@ti.com> | 2012-04-18 11:28:50 -0700 |
commit | a6d21d824242244ec6c02c18a517bf021f1e70cd (patch) | |
tree | 32f54ec3c092c5184509b2b497d49cb159bd087e /arch/arm/mach-omap2/include/mach | |
parent | afadff82e7b2041498c95f266b76b21dda04e703 (diff) | |
download | kernel_samsung_tuna-a6d21d824242244ec6c02c18a517bf021f1e70cd.zip kernel_samsung_tuna-a6d21d824242244ec6c02c18a517bf021f1e70cd.tar.gz kernel_samsung_tuna-a6d21d824242244ec6c02c18a517bf021f1e70cd.tar.bz2 |
OMAP4: EMIF: Disable EMIF DDR self refresh during EMIF frequency change sequences
Errata ID: i728
Description:
If during a small window the following three events occur simultaneously:
1) The EMIF_PWR_MGMT_CTRL[7:4] REG_SR_TIM SR_TIMING counter expires
2) Frequency change update is requested CM_SHADOW_FREQ_CONFIG1
FREQ_UPDATE set to 1
3) OCP access is requested
There will be clock instability on the DDR interface.
Workaround:
Prevent event 1) while event 2) is happening: Disable the self-refresh when
self-refresh is enabled and a frequency change sequence is requested.
Change-Id: I6c216d18f2747dae8a9160669533f0f1582d3301
Signed-off-by: Jacky Cheung <jacky.cheung@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/include/mach')
-rw-r--r-- | arch/arm/mach-omap2/include/mach/emif.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/include/mach/emif.h b/arch/arm/mach-omap2/include/mach/emif.h index 3a65b20..8a3ea34 100644 --- a/arch/arm/mach-omap2/include/mach/emif.h +++ b/arch/arm/mach-omap2/include/mach/emif.h @@ -258,6 +258,8 @@ struct emif_regs { int omap_emif_setup_registers(u32 freq, u32 volt_state); +void omap_emif_frequency_pre_notify(void); +void omap_emif_frequency_post_notify(void); int omap_emif_setup_device_details( const struct emif_device_details *emif1_devices, const struct emif_device_details *emif2_devices); |