From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: [patch 37/40] libata: backport ATA_FLAG_NO_SRST and ATA_FLAG_ASSUME_ATA Date: Wed, 14 Nov 2007 22:45:54 -0800 Message-ID: <20071115064554.GL19218@kroah.com> References: <20071115062710.885284510@mini.kroah.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from pentafluge.infradead.org ([213.146.154.40]:43759 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762766AbXKOGsU (ORCPT ); Thu, 15 Nov 2007 01:48:20 -0500 Content-Disposition: inline; filename="libata-backport-ata_flag_no_srst-and-ata_flag_assume_ata.patch" In-Reply-To: <20071115064302.GA19218@kroah.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: linux-kernel@vger.kernel.org, stable@kernel.org, linux-ide@vger.kernel.org, Jeff Garzik Cc: Justin Forbes , Zwane Mwaikambo , Theodore Ts'o , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Tejun Heo -stable review patch. If anyone has any objections, please let us know. ------------------ From: Tejun Heo Differs from mainline, but the functionality is already there. Backport ATA_FLAG_NO_SRST and ATA_FLAG_ASSUME_ATA. These are originally link flags (ATA_LFLAG_*) but link abstraction doesn't exist on 2.6.23, so make it port flags. This is for the following workaround for ASUS P5W DH Deluxe. These new flags don't introduce any behavior change unless set and nobody sets them yet. Signed-off-by: Tejun Heo Cc: Jeff Garzik Signed-off-by: Greg Kroah-Hartman --- drivers/ata/libata-eh.c | 32 ++++++++++++++++++++++++-------- include/linux/libata.h | 2 ++ 2 files changed, 26 insertions(+), 8 deletions(-) --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -1759,9 +1759,11 @@ static int ata_do_reset(struct ata_port return 0; } -static int ata_eh_followup_srst_needed(int rc, int classify, - const unsigned int *classes) +static int ata_eh_followup_srst_needed(struct ata_port *ap, int rc, + int classify, const unsigned int *classes) { + if (ap->flags & ATA_FLAG_NO_SRST) + return 0; if (rc == -EAGAIN) return 1; if (rc != 0) @@ -1792,7 +1794,8 @@ static int ata_eh_reset(struct ata_port */ action = ehc->i.action; ehc->i.action &= ~ATA_EH_RESET_MASK; - if (softreset && (!hardreset || (!sata_set_spd_needed(ap) && + if (softreset && (!hardreset || (!(ap->flags & ATA_FLAG_NO_SRST) && + !sata_set_spd_needed(ap) && !(action & ATA_EH_HARDRESET)))) ehc->i.action |= ATA_EH_SOFTRESET; else @@ -1855,7 +1858,7 @@ static int ata_eh_reset(struct ata_port rc = ata_do_reset(ap, reset, classes, deadline); if (reset == hardreset && - ata_eh_followup_srst_needed(rc, classify, classes)) { + ata_eh_followup_srst_needed(ap, rc, classify, classes)) { /* okay, let's do follow-up softreset */ reset = softreset; @@ -1870,8 +1873,8 @@ static int ata_eh_reset(struct ata_port ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK); rc = ata_do_reset(ap, reset, classes, deadline); - if (rc == 0 && classify && - classes[0] == ATA_DEV_UNKNOWN) { + if (rc == 0 && classify && classes[0] == ATA_DEV_UNKNOWN && + !(ap->flags & ATA_FLAG_ASSUME_ATA)) { ata_port_printk(ap, KERN_ERR, "classification failed\n"); rc = -EINVAL; @@ -1879,6 +1882,10 @@ static int ata_eh_reset(struct ata_port } } + /* if we skipped follow-up srst, clear rc */ + if (rc == -EAGAIN) + rc = 0; + if (rc && try < ARRAY_SIZE(ata_eh_reset_timeouts)) { unsigned long now = jiffies; @@ -1906,8 +1913,17 @@ static int ata_eh_reset(struct ata_port /* After the reset, the device state is PIO 0 and the * controller state is undefined. Record the mode. */ - for (i = 0; i < ATA_MAX_DEVICES; i++) - ap->device[i].pio_mode = XFER_PIO_0; + for (i = 0; i < ata_port_max_devices(ap); i++) { + struct ata_device *dev = &ap->device[i]; + + dev->pio_mode = XFER_PIO_0; + + if (ata_port_offline(ap)) + continue; + + if (ap->flags & ATA_FLAG_ASSUME_ATA) + classes[dev->devno] = ATA_DEV_ATA; + } /* record current link speed */ if (sata_scr_read(ap, SCR_STATUS, &sstatus) == 0) --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -177,6 +177,8 @@ enum { ATA_FLAG_IGN_SIMPLEX = (1 << 15), /* ignore SIMPLEX */ ATA_FLAG_NO_IORDY = (1 << 16), /* controller lacks iordy */ ATA_FLAG_ACPI_SATA = (1 << 17), /* need native SATA ACPI layout */ + ATA_FLAG_NO_SRST = (1 << 18), + ATA_FLAG_ASSUME_ATA = (1 << 19), /* The following flag belongs to ap->pflags but is kept in * ap->flags because it's referenced in many LLDs and will be --