diff options
| author | Peng Fan <peng.fan@nxp.com> | 2016-11-22 19:41:09 +0800 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-11-29 08:15:31 -0500 |
| commit | fea7452c15081127e07b77e286a89d2c296f6b05 (patch) | |
| tree | 4d350ec55778ab7d7cd8159ce9b3bb9c24e45665 /arch/arm/cpu/armv7 | |
| parent | 88e0d59315f4863537a94f12ef48348764f4316b (diff) | |
armv7: psci: cpu_off: flush D-Cache before disable D-Cache
Before disable cache, need to first flush cache.
There maybe dirty data in D-Cache before disable D-Cache.
After disable D-Cache, the first store instructions in
psci_v7_flush_dcache_all will directly store registers
{r4-r5, r7, r9-r11, lr} to memory.
If there is dirty data before disable D-Cache,
psci_v7_flush_dcache_all will flush data to memory,
and may overwrite the memory that hold the registers
{r4-r5, r7, r9-r11, lr}.
So before disable cache, first flush D-Cache.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Hongbo Zhang <hongbo.zhang@nxp.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/arm/cpu/armv7')
| -rw-r--r-- | arch/arm/cpu/armv7/psci.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/psci.S b/arch/arm/cpu/armv7/psci.S index 6a362085a6..95b962dadf 100644 --- a/arch/arm/cpu/armv7/psci.S +++ b/arch/arm/cpu/armv7/psci.S @@ -258,6 +258,10 @@ ENDPROC(psci_enable_smp) ENTRY(psci_cpu_off_common) push {lr} + bl psci_v7_flush_dcache_all + + clrex @ Why??? + mrc p15, 0, r0, c1, c0, 0 @ SCTLR bic r0, r0, #(1 << 2) @ Clear C bit mcr p15, 0, r0, c1, c0, 0 @ SCTLR |