Commit 83521291 authored by Jean Pihet's avatar Jean Pihet Committed by Kevin Hilman

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: default avatarJean Pihet <j-pihet@ti.com>
Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: default avatarNishanth Menon <nm@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent f7dfe3d8
......@@ -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 &&
......
......@@ -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:
......
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