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authorStewart Smith <stewart@linux.ibm.com>2018-03-29 09:02:46 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-03 08:55:14 +0300
commitc3e347251cfdd18591c571b1b0bafbbd314ab72b (patch)
tree13e3670a4a8eee069e126f524897828839f27210
parentee245de4b32ba8836b43798a9aeca99f6a186592 (diff)
downloadlinux-c3e347251cfdd18591c571b1b0bafbbd314ab72b.tar.xz
hvc_opal: don't set tb_ticks_per_usec in udbg_init_opal_common()
[ Upstream commit 447808bf500a7cc92173266a59f8a494e132b122 ] time_init() will set up tb_ticks_per_usec based on reality. time_init() is called *after* udbg_init_opal_common() during boot. from arch/powerpc/kernel/time.c: unsigned long tb_ticks_per_usec = 100; /* sane default */ Currently, all powernv systems have a timebase frequency of 512mhz (512000000/1000000 == 0x200) - although there's nothing written down anywhere that I can find saying that we couldn't make that different based on the requirements in the ISA. So, we've been (accidentally) thwacking the (currently) correct (for powernv at least) value for tb_ticks_per_usec earlier than we otherwise would have. The "sane default" seems to be adequate for our purposes between udbg_init_opal_common() and time_init() being called, and if it isn't, then we should probably be setting it somewhere that isn't hvc_opal.c! Signed-off-by: Stewart Smith <stewart@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/hvc/hvc_opal.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/tty/hvc/hvc_opal.c b/drivers/tty/hvc/hvc_opal.c
index 510799311099..1fc5d5b82778 100644
--- a/drivers/tty/hvc/hvc_opal.c
+++ b/drivers/tty/hvc/hvc_opal.c
@@ -332,7 +332,6 @@ static void udbg_init_opal_common(void)
udbg_putc = udbg_opal_putc;
udbg_getc = udbg_opal_getc;
udbg_getc_poll = udbg_opal_getc_poll;
- tb_ticks_per_usec = 0x200; /* Make udelay not suck */
}
void __init hvc_opal_init_early(void)