diff options
| author | Will Deacon <will.deacon@arm.com> | 2012-04-20 17:21:08 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-12 09:32:21 -0700 |
| commit | c2fa9282ae75212b61077b274bf69d89890362e5 (patch) | |
| tree | c5679d2f7d88ef5940c3354f4b6ab84038fec4db | |
| parent | 502fd05d816f4a74a1a7bb45896ba35a33f8da10 (diff) | |
ARM: 7397/1: l2x0: only apply workaround for erratum #753970 on PL310
commit f154fe9b806574437b47f08e924ad10c0e240b23 upstream.
The workaround for PL310 erratum #753970 can lead to deadlock on systems
with an L220 cache controller.
This patch makes the workaround effective only when the cache controller
is identified as a PL310 at probe time.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/arm/mm/cache-l2x0.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index b1e192ba8c24..971d52749afd 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -32,6 +32,7 @@ static void __iomem *l2x0_base; static DEFINE_RAW_SPINLOCK(l2x0_lock); static uint32_t l2x0_way_mask; /* Bitmask of active ways */ static uint32_t l2x0_size; +static unsigned long sync_reg_offset = L2X0_CACHE_SYNC; struct l2x0_regs l2x0_saved_regs; @@ -61,12 +62,7 @@ static inline void cache_sync(void) { void __iomem *base = l2x0_base; -#ifdef CONFIG_PL310_ERRATA_753970 - /* write to an unmmapped register */ - writel_relaxed(0, base + L2X0_DUMMY_REG); -#else - writel_relaxed(0, base + L2X0_CACHE_SYNC); -#endif + writel_relaxed(0, base + sync_reg_offset); cache_wait(base + L2X0_CACHE_SYNC, 1); } @@ -331,6 +327,10 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask) else ways = 8; type = "L310"; +#ifdef CONFIG_PL310_ERRATA_753970 + /* Unmapped register. */ + sync_reg_offset = L2X0_DUMMY_REG; +#endif break; case L2X0_CACHE_ID_PART_L210: ways = (aux >> 13) & 0xf; |