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[3/5] bus: arm-ccn: Fix XP watchpoint settings bitmask

Message ID 1471019156-5485-4-git-send-email-pawel.moll@arm.com
State Accepted
Commit b928466b2169e061822daad48ecf55b005445547
Headers show

Commit Message

Pawel Moll Aug. 12, 2016, 4:25 p.m. UTC 
The code setting XP watchpoint comparator and mask registers should, in
order to be fully compliant with specification, zero one or more most
significant bits of each field. In both L cases it means zeroing bit 63.
The bitmask doing this was wrong, though, zeroing bit 60 instead.
Fortunately, due to a lucky coincidence, this turned out to be fairly
innocent with the existing hardware.

Fixed now.

Cc: stable@vger.kernel.org # 3.17+
Signed-off-by: Pawel Moll <pawel.moll@arm.com>

---
 drivers/bus/arm-ccn.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.7.4


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diff mbox

Patch

diff --git a/drivers/bus/arm-ccn.c b/drivers/bus/arm-ccn.c
index 9bbb0ab..647a27b 100644
--- a/drivers/bus/arm-ccn.c
+++ b/drivers/bus/arm-ccn.c
@@ -1003,7 +1003,7 @@  static void arm_ccn_pmu_xp_watchpoint_config(struct perf_event *event)
 
 	/* Comparison values */
 	writel(cmp_l & 0xffffffff, source->base + CCN_XP_DT_CMP_VAL_L(wp));
-	writel((cmp_l >> 32) & 0xefffffff,
+	writel((cmp_l >> 32) & 0x7fffffff,
 			source->base + CCN_XP_DT_CMP_VAL_L(wp) + 4);
 	writel(cmp_h & 0xffffffff, source->base + CCN_XP_DT_CMP_VAL_H(wp));
 	writel((cmp_h >> 32) & 0x0fffffff,
@@ -1011,7 +1011,7 @@  static void arm_ccn_pmu_xp_watchpoint_config(struct perf_event *event)
 
 	/* Mask */
 	writel(mask_l & 0xffffffff, source->base + CCN_XP_DT_CMP_MASK_L(wp));
-	writel((mask_l >> 32) & 0xefffffff,
+	writel((mask_l >> 32) & 0x7fffffff,
 			source->base + CCN_XP_DT_CMP_MASK_L(wp) + 4);
 	writel(mask_h & 0xffffffff, source->base + CCN_XP_DT_CMP_MASK_H(wp));
 	writel((mask_h >> 32) & 0x0fffffff,