Commit 988257cf authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Russell King
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ARM: 6294/1: etm: do a dummy read from OSSRR during initialization

The first read from ETM OS save and restore register after the power
down bit deassertion returns garbage.

Signed-off-by: default avatarAlexander Shishkin <>
Signed-off-by: default avatarRussell King <>
parent 9e354ea8
......@@ -543,7 +543,9 @@ static int __init etm_probe(struct amba_device *dev, struct amba_id *id)
t->etm_portsz = 1;
ret = etm_readl(t, ETMMR_PDSR);
(void)etm_readl(t, ETMMR_PDSR);
/* dummy first read */
(void)etm_readl(&tracer, ETMMR_OSSRR);
t->ncmppairs = etm_readl(t, ETMR_CONFCODE) & 0xf;
etm_writel(t, 0x440, ETMR_CTRL);
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