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| author | Paul Walmsley <paul@pwsan.com> | 2009-05-12 17:27:09 -0600 |
|---|---|---|
| committer | paul <paul@twilight.(none)> | 2009-05-12 17:27:09 -0600 |
| commit | fa0406a8d8c3a4a302085ccd031d999161405f70 (patch) | |
| tree | bc37051ba47599b871a0f438070821f8c4bbf0ea /arch/arm | |
| parent | d75d9e73cd59127a4d926a2bf5e9cdcc90f033d6 (diff) | |
| download | blackbird-op-linux-fa0406a8d8c3a4a302085ccd031d999161405f70.tar.gz blackbird-op-linux-fa0406a8d8c3a4a302085ccd031d999161405f70.zip | |
OMAP3 SRAM: clear the SDRC PWRENA bit during SDRC frequency change
Clear the SDRC_POWER.PWRENA bit before putting the SDRAM into self-refresh
mode. This prevents the SDRC from attempting to power off the SDRAM,
which can cause the system to hang.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-omap2/sram34xx.S | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/arm/mach-omap2/sram34xx.S b/arch/arm/mach-omap2/sram34xx.S index 8d524f305633..9a454151c422 100644 --- a/arch/arm/mach-omap2/sram34xx.S +++ b/arch/arm/mach-omap2/sram34xx.S @@ -77,7 +77,9 @@ lock_dll: sdram_in_selfrefresh: ldr r4, omap3_sdrc_power @ read the SDRC_POWER register ldr r5, [r4] @ read the contents of SDRC_POWER + mov r9, r5 @ keep a copy of SDRC_POWER bits orr r5, r5, #0x40 @ enable self refresh on idle req + bic r5, r5, #0x4 @ clear PWDENA str r5, [r4] @ write back to SDRC_POWER register ldr r5, [r4] @ posted-write barrier for SDRC ldr r4, omap3_cm_iclken1_core @ read the CM_ICLKEN1_CORE reg @@ -128,10 +130,9 @@ wait_sdrc_idle1: and r5, r5, #0x2 cmp r5, #0 bne wait_sdrc_idle1 +restore_sdrc_power_val: ldr r4, omap3_sdrc_power - ldr r5, [r4] - bic r5, r5, #0x40 - str r5, [r4] + str r9, [r4] @ restore SDRC_POWER, no barrier needed bx lr wait_dll_lock: ldr r4, omap3_sdrc_dlla_status |
