From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: [PATCH 12/12] libata-hp-prep: implement followup softreset handling Date: Tue, 30 May 2006 00:12:28 -0400 Message-ID: <447BC62C.9080706@pobox.com> References: <11488839582516-git-send-email-htejun@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from srv5.dvmed.net ([207.36.208.214]:52451 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1751473AbWE3EMh (ORCPT ); Tue, 30 May 2006 00:12:37 -0400 In-Reply-To: <11488839582516-git-send-email-htejun@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: mlord@pobox.com, albertcc@tw.ibm.com, alan@lxorguk.ukuu.org.uk, axboe@suse.de, forrest.zhao@intel.com, linux-ide@vger.kernel.org Tejun Heo wrote: > In some cases, hardreset must be followed by SRST. > > * some controllers can't classify with hardreset > * some controllers can't wait for !BSY after hardreset (LLDD should > explicitly request followup softreset by returning -EAGAIN) > * (later) PM needs SRST w/ PMP==15 to operate after hardreset > > To handle above cases, this patch implements follow-up softreset. > After a hardreset, ata_eh_reset() checks whether any of above > conditions are met and do a follow-up softreset if necessary. > > Signed-off-by: Tejun Heo ACK