Date: Mon, 21 Jul 2008 14:35:56 +0400 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: Sergey G Nasonov <snasonov@bcc.ru> Cc: freebsd-current@freebsd.org, =?UTF-8?B?U8O4cmVuIFNjaG1pZHQ=?= <sos@FreeBSD.org> Subject: RFC, RFT: AHCI driver reorganization (was: Re: ATA subsystem lost drive after resume process) Message-ID: <4884668C.5060606@yandex.ru> In-Reply-To: <200807151124.36621.snasonov@bcc.ru> References: <200807151124.36621.snasonov@bcc.ru>
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Sergey G Nasonov wrote:
> to disk. So the basic issue preventing normal suspend/resume
> process on modern Lenovo laptops is ata subsystem. Does anyone can
> help with this problem? I can test any path or provide additional
> info.
Hi, All.
I wrote patch for AHCI driver and Sergey tested it.
So, He reported that now "suspend/resume" works on his laptop.
I'll try to describe all changes which my patch makes.
1. Initialization:
* Global AHCI reset code moved to ata_ahci_reset_controller()
function (it will be reused in ata_ahci_resume).
* Detection of implemented ports moved to ata_ahci_allocate()
function (i think it isn't needed to detect it on each reset).
* From ata_ahci_allocate() function removed all working code,
only initialization code is here.
2. Resetting:
* ata_ahci_reset() function reorganized and splitted to several
functions:
ata_ahci_stop_channel() - stop all port activity;
ata_ahci_fre_stop() - disable FIS receiving;
ata_ahci_fre_start() - setup work areas and enable FIS receiving;
ata_ahci_clo_enable() - enable command list override.
* working code from ata_ahci_allocate moved to ata_ahci_reset.
* CLO shall only be set immediately prior to setting the PxCMD.ST
bit to '1' (from AHCI spec).
* Software shall not set PxCMD.ST to 1 until it is determined that a
functional device is present on the port (from AHCI spec).
* removed hack when didn't detect signature asuming disk device (it
may broke some systems, but it needs testing).
3. Interrupts handling:
* Call ata_sata_phy_check_events() only when PHY changing detected.
* Fatal error handling changed.
4. Suspend/resume:
* Added new methods to atapci(4) driver
* Added suspend/resume implementation for AHCI:
+ Software must disable interrupts prior to requesting a
transition of the HBA to the D3 state.
+ Reset controller and enable interrupts before resume.
So, any comments and suggestions are welcome.
--
WBR, Andrey V. Elsukov
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