linux-kernel - Re: [PATCH v2 1/3] ahci: add AHCI_HFLAG_DELAY

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Message-ID: <4F5FAFE4.5090703@pobox.com>
Date:	Tue, 13 Mar 2012 16:36:52 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Brian Norris <computersforpeace@...il.com>
CC:	linux-ide@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Lin Ming <ming.m.lin@...el.com>,
	Norbert Preining <preining@...ic.at>,
	"Srivatsa S . Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Valdis Kletnieks <valdis.kletnieks@...edu>,
	"Rafael J . Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH v2 1/3] ahci: add AHCI_HFLAG_DELAY_ENGINE host flag

On 02/21/2012 01:38 PM, Brian Norris wrote:
> The following commit was intended to fix problems with specific AHCI
> controller(s) that would become bricks if the AHCI specification was not
> followed strictly (that is, if ahci_start_engine() was called while the
> controller was in the wrong state):
>
>      commit 7faa33da9b7add01db9f1ad92c6a5d9145e940a7
>      ahci: start engine only during soft/hard resets
>
> However, some devices currently have issues with that fix, so we must
> implement a flag that delays the ahci_start_engine() call only for specific
> controllers.
>
> This commit simply introduces the flag, without enabling it in any driver.
>
> Note that even when AHCI_HFLAG_DELAY_ENGINE is not enabled, this patch does
> not constitue a full revert to commit 7faa33da; there is still a change in
> behavior to the ahci_port_suspend() failure path.
>
> Signed-off-by: Brian Norris<computersforpeace@...il.com>

applied 1-3



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