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authorSimon Guinot <sguinot@lacie.com>2010-10-21 11:42:28 +0200
committerNicolas Pitre <nico@fluxnic.net>2010-10-21 14:09:52 -0400
commit2fa0f93915eacf758da800e2c67b3b9adef1c5c5 (patch)
treebd99ab4599ff84e25b91b90c687ef9fd0aaf83a7 /arch/arm/mach-kirkwood
parentaf9a2d006611124eb1de9d7fee160b25b252ad98 (diff)
downloadblackbird-op-linux-2fa0f93915eacf758da800e2c67b3b9adef1c5c5.tar.gz
blackbird-op-linux-2fa0f93915eacf758da800e2c67b3b9adef1c5c5.zip
[ARM] Kirkwood: enhance TCLK detection
According to the Marvell LSP, the Sample at Reset regiter bit 21 can be used to detect TCLK on 6281 and 6282 devices. This patch has only been tested on LaCie boards. Signed-off-by: Simon Guinot <sguinot@lacie.com> Acked-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
Diffstat (limited to 'arch/arm/mach-kirkwood')
-rw-r--r--arch/arm/mach-kirkwood/common.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index 1c82d4290dad..ee99a5acc89d 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -854,10 +854,9 @@ int __init kirkwood_find_tclk(void)
kirkwood_pcie_id(&dev, &rev);
- if ((dev == MV88F6281_DEV_ID && (rev == MV88F6281_REV_A0 ||
- rev == MV88F6281_REV_A1)) ||
- (dev == MV88F6282_DEV_ID))
- return 200000000;
+ if (dev == MV88F6281_DEV_ID || dev == MV88F6282_DEV_ID)
+ if (((readl(SAMPLE_AT_RESET) >> 21) & 1) == 0)
+ return 200000000;
return 166666667;
}
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