From: Qipan Li <Qipan.Li@csr.com>
Date: Thu, 3 Jul 2014 13:26:59 +0000 (+0800)
Subject: serial: sirf: transfer more bytes once to decrease interrupts
X-Git-Tag: cleanup-for-v3.18~124^2~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7282cec90365533befce1552ab09edbcd0af0dbd;p=pandora-kernel.git

serial: sirf: transfer more bytes once to decrease interrupts

the current codes send 1 bytes, then after getting TX done interrupt,
send subsequent bytes. it causes redundant interrupts.
for example, if we have 3 bytes in TX buffer, the TX flow is:
1. send 1 byte
2. get TX down interrupt
3. send the left 2 bytes
4. get TX down interrupt

this patch moves to send more bytes and decrease interrupts, the new
flow is:
1. send 3 bytes
2. get TX down interrupt

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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