diff options
| author | Jean Pihet <j-pihet@ti.com> | 2010-12-18 16:44:46 +0100 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-12-21 14:45:59 -0800 |
| commit | 8352129166b8270253a746f336a4429b349b023d (patch) | |
| tree | 6e1a83e571d357b30ab15878b9ebcf8da21c0c62 /arch/arm | |
| parent | f7dfe3d8a98b7c4869c09826e3a65663cb9c71be (diff) | |
| download | blackbird-op-linux-8352129166b8270253a746f336a4429b349b023d.tar.gz blackbird-op-linux-8352129166b8270253a746f336a4429b349b023d.zip | |
OMAP3: add comments for low power code errata
Errata covered:
- 1.157 & 1.185
- i443
- i581
Tested on N900 and Beagleboard with full RET and OFF modes,
using cpuidle and suspend.
Signed-off-by: Jean Pihet <j-pihet@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-omap2/pm34xx.c | 4 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/sleep34xx.S | 11 |
2 files changed, 13 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index a81ed251e667..c45b4fa1deeb 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -146,7 +146,7 @@ static void omap3_core_save_context(void) /* * Force write last pad into memory, as this can fail in some - * cases according to erratas 1.157, 1.185 + * cases according to errata 1.157, 1.185 */ omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14), OMAP343X_CONTROL_MEM_WKUP + 0x2a0); @@ -433,7 +433,7 @@ void omap_sram_idle(void) /* * On EMU/HS devices ROM code restores a SRDC value * from scratchpad which has automatic self refresh on timeout - * of AUTO_CNT = 1 enabled. This takes care of errata 1.142. + * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443. * Hence store/restore the SDRC_POWER register here. */ if (omap_rev() >= OMAP3430_REV_ES3_0 && diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S index 06e47326e17c..17dfe30db3a7 100644 --- a/arch/arm/mach-omap2/sleep34xx.S +++ b/arch/arm/mach-omap2/sleep34xx.S @@ -596,6 +596,7 @@ usettbr0: * Internal functions */ +/* This function implements the erratum ID i443 WA, applies to 34xx >= ES3.0 */ .text ENTRY(es3_sdrc_fix) ldr r4, sdrc_syscfg @ get config addr @@ -641,6 +642,16 @@ sdrc_manual_1: ENTRY(es3_sdrc_fix_sz) .word . - es3_sdrc_fix +/* + * This function implements the erratum ID i581 WA: + * SDRC state restore before accessing the SDRAM + * + * Only used at return from non-OFF mode. For OFF + * mode the ROM code configures the SDRC and + * the DPLL before calling the restore code directly + * from DDR. + */ + /* Make sure SDRC accesses are ok */ wait_sdrc_ok: |
