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ARM: 7397/1: l2x0: only apply workaround for erratum #753970 on PL310

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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.

Cc: stable@vger.kernel.org
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2012-04-20 17:21:08 +01:00 committed by Russell King
parent f0c4b8d653
commit f154fe9b80
1 changed files with 6 additions and 6 deletions
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12
arch/arm/mm/cache-l2x0.c
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@ -32,6 +32,7 @@ static void __iomem *l2x0_base;
static DEFINE_RAW_SPINLOCK(l2x0_lock);
static u32 l2x0_way_mask; /* Bitmask of active ways */
static u32 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;