From 1b677afda44f7882b7e257d6f025d006ec5d14f9 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Mon, 16 Nov 2009 09:56:05 +0800 Subject: [PATCH] ahci: disable SNotification capability for ich8 I obseved there is a sata_async_notification() for every ahci interrupt. But the async notification does nothing (this is hard disk drive and no pmp). This cause cpu wastes some time on sntf register access. It appears ICH AHCI doesn't support SNotification register, but the controller reports it does. After quirking it, the async notification disappears. PS. it appears all ICH don't support SNotification register from ICH manual, don't know if we need quirk all ICH. I don't have machines with all kinds of ICH. Signed-off-by: Shaohua Li Signed-off-by: Jeff Garzik --- drivers/ata/ahci.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index a3241a1a710b..9519c777af83 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -113,6 +113,7 @@ enum { board_ahci_mcp65 = 6, board_ahci_nopmp = 7, board_ahci_yesncq = 8, + board_ahci_nosntf = 9, /* global controller registers */ HOST_CAP = 0x00, /* host capabilities */ @@ -235,6 +236,7 @@ enum { AHCI_HFLAG_NO_SUSPEND = (1 << 10), /* don't suspend */ AHCI_HFLAG_SRST_TOUT_IS_OFFLINE = (1 << 11), /* treat SRST timeout as link offline */ + AHCI_HFLAG_NO_SNTF = (1 << 12), /* no sntf */ /* ap->flags bits */ @@ -508,7 +510,7 @@ static const struct ata_port_info ahci_port_info[] = { .udma_mask = ATA_UDMA6, .port_ops = &ahci_ops, }, - /* board_ahci_yesncq */ + [board_ahci_yesncq] = { AHCI_HFLAGS (AHCI_HFLAG_YES_NCQ), .flags = AHCI_FLAG_COMMON, @@ -516,6 +518,14 @@ static const struct ata_port_info ahci_port_info[] = { .udma_mask = ATA_UDMA6, .port_ops = &ahci_ops, }, + [board_ahci_nosntf] = + { + AHCI_HFLAGS (AHCI_HFLAG_NO_SNTF), + .flags = AHCI_FLAG_COMMON, + .pio_mask = ATA_PIO4, + .udma_mask = ATA_UDMA6, + .port_ops = &ahci_ops, + }, }; static const struct pci_device_id ahci_pci_tbl[] = { @@ -531,7 +541,7 @@ static const struct pci_device_id ahci_pci_tbl[] = { { PCI_VDEVICE(INTEL, 0x2683), board_ahci }, /* ESB2 */ { PCI_VDEVICE(INTEL, 0x27c6), board_ahci }, /* ICH7-M DH */ { PCI_VDEVICE(INTEL, 0x2821), board_ahci }, /* ICH8 */ - { PCI_VDEVICE(INTEL, 0x2822), board_ahci }, /* ICH8 */ + { PCI_VDEVICE(INTEL, 0x2822), board_ahci_nosntf }, /* ICH8 */ { PCI_VDEVICE(INTEL, 0x2824), board_ahci }, /* ICH8 */ { PCI_VDEVICE(INTEL, 0x2829), board_ahci }, /* ICH8M */ { PCI_VDEVICE(INTEL, 0x282a), board_ahci }, /* ICH8M */ @@ -849,6 +859,12 @@ static void ahci_save_initial_config(struct pci_dev *pdev, cap &= ~HOST_CAP_PMP; } + if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) { + dev_printk(KERN_INFO, &pdev->dev, + "controller can't do SNTF, turning off CAP_SNTF\n"); + cap &= ~HOST_CAP_SNTF; + } + if (pdev->vendor == PCI_VENDOR_ID_JMICRON && pdev->device == 0x2361 && port_map != 1) { dev_printk(KERN_INFO, &pdev->dev, -- 2.30.2