From f3745a3f9fa39fa3c62f7d5b8549ee787d2c6848 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 22 Aug 2006 21:06:46 +0900 Subject: [PATCH 1/3] [PATCH] ata_piix: ignore PCS on ICH5 There have been a number of reports regarding some ICH5s failing to detect devices since the PCS handling update. Analysis shows that these problems are caused by bogus PCS values from those controllers. Before the PCS update, the driver didn't honor PCS regs exactly and probed them in many cases PCS reports no device. Now that PCS is honored exactly, these hardware problems are visible. This patch makes ICH5 ignore PCS. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/scsi/ata_piix.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c index 01b3530cf6df..3b98f1813356 100644 --- a/drivers/scsi/ata_piix.c +++ b/drivers/scsi/ata_piix.c @@ -390,7 +390,8 @@ static struct ata_port_info piix_port_info[] = { /* ich5_sata */ { .sht = &piix_sht, - .host_flags = ATA_FLAG_SATA | PIIX_FLAG_CHECKINTR, + .host_flags = ATA_FLAG_SATA | PIIX_FLAG_CHECKINTR | + PIIX_FLAG_IGNORE_PCS, .pio_mask = 0x1f, /* pio0-4 */ .mwdma_mask = 0x07, /* mwdma0-2 */ .udma_mask = 0x7f, /* udma0-6 */ From 9dd9c16465c82d1385f97d2a245641464fcb7894 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 22 Aug 2006 21:15:58 +0900 Subject: [PATCH 2/3] [PATCH] ata_piix: implement force_pcs module parameter This patch implements force_pcs module parameter for ata_piix. If 1, PCS is ignored, 2 honored. As there seem to be quite a few ICHs w/ impaired PCS, this option will be useful for cases where the default setting doesn't work. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/scsi/ata_piix.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c index 3b98f1813356..2d20caf377f5 100644 --- a/drivers/scsi/ata_piix.c +++ b/drivers/scsi/ata_piix.c @@ -468,6 +468,11 @@ MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, piix_pci_tbl); MODULE_VERSION(DRV_VERSION); +static int force_pcs = 0; +module_param(force_pcs, int, 0444); +MODULE_PARM_DESC(force_pcs, "force honoring or ignoring PCS to work around " + "device mis-detection (0=default, 1=ignore PCS, 2=honor PCS)"); + /** * piix_pata_cbl_detect - Probe host controller cable detect info * @ap: Port for which cable detect info is desired @@ -812,6 +817,7 @@ static int __devinit piix_check_450nx_errata(struct pci_dev *ata_dev) } static void __devinit piix_init_pcs(struct pci_dev *pdev, + struct ata_port_info *pinfo, const struct piix_map_db *map_db) { u16 pcs, new_pcs; @@ -825,6 +831,18 @@ static void __devinit piix_init_pcs(struct pci_dev *pdev, pci_write_config_word(pdev, ICH5_PCS, new_pcs); msleep(150); } + + if (force_pcs == 1) { + dev_printk(KERN_INFO, &pdev->dev, + "force ignoring PCS (0x%x)\n", new_pcs); + pinfo[0].host_flags |= PIIX_FLAG_IGNORE_PCS; + pinfo[1].host_flags |= PIIX_FLAG_IGNORE_PCS; + } else if (force_pcs == 2) { + dev_printk(KERN_INFO, &pdev->dev, + "force honoring PCS (0x%x)\n", new_pcs); + pinfo[0].host_flags &= ~PIIX_FLAG_IGNORE_PCS; + pinfo[1].host_flags &= ~PIIX_FLAG_IGNORE_PCS; + } } static void __devinit piix_init_sata_map(struct pci_dev *pdev, @@ -933,7 +951,8 @@ static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) if (host_flags & ATA_FLAG_SATA) { piix_init_sata_map(pdev, port_info, piix_map_db_table[ent->driver_data]); - piix_init_pcs(pdev, piix_map_db_table[ent->driver_data]); + piix_init_pcs(pdev, port_info, + piix_map_db_table[ent->driver_data]); } /* On ICH5, some BIOSen disable the interrupt using the From ac2164d5e425fa4755bdbab9641d8dab7239b6f5 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 23 Aug 2006 01:00:27 +0900 Subject: [PATCH 3/3] [PATCH] sata_via: use old SCR access pattern on vt6420 vt6420 has super-fragile SCR registers which can hang the whole machine if accessed with the wrong timings. This patch makes sata_via use SCR registers only during probing and with the same timings as before (pre new EH), which is proven to work. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/scsi/sata_via.c | 117 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 112 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/sata_via.c b/drivers/scsi/sata_via.c index 03baec2191bf..01d40369a8a5 100644 --- a/drivers/scsi/sata_via.c +++ b/drivers/scsi/sata_via.c @@ -74,6 +74,7 @@ enum { static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent); static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg); static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val); +static void vt6420_error_handler(struct ata_port *ap); static const struct pci_device_id svia_pci_tbl[] = { { 0x1106, 0x3149, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6420 }, @@ -107,7 +108,38 @@ static struct scsi_host_template svia_sht = { .bios_param = ata_std_bios_param, }; -static const struct ata_port_operations svia_sata_ops = { +static const struct ata_port_operations vt6420_sata_ops = { + .port_disable = ata_port_disable, + + .tf_load = ata_tf_load, + .tf_read = ata_tf_read, + .check_status = ata_check_status, + .exec_command = ata_exec_command, + .dev_select = ata_std_dev_select, + + .bmdma_setup = ata_bmdma_setup, + .bmdma_start = ata_bmdma_start, + .bmdma_stop = ata_bmdma_stop, + .bmdma_status = ata_bmdma_status, + + .qc_prep = ata_qc_prep, + .qc_issue = ata_qc_issue_prot, + .data_xfer = ata_pio_data_xfer, + + .freeze = ata_bmdma_freeze, + .thaw = ata_bmdma_thaw, + .error_handler = vt6420_error_handler, + .post_internal_cmd = ata_bmdma_post_internal_cmd, + + .irq_handler = ata_interrupt, + .irq_clear = ata_bmdma_irq_clear, + + .port_start = ata_port_start, + .port_stop = ata_port_stop, + .host_stop = ata_host_stop, +}; + +static const struct ata_port_operations vt6421_sata_ops = { .port_disable = ata_port_disable, .tf_load = ata_tf_load, @@ -141,13 +173,13 @@ static const struct ata_port_operations svia_sata_ops = { .host_stop = ata_host_stop, }; -static struct ata_port_info svia_port_info = { +static struct ata_port_info vt6420_port_info = { .sht = &svia_sht, .host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY, .pio_mask = 0x1f, .mwdma_mask = 0x07, .udma_mask = 0x7f, - .port_ops = &svia_sata_ops, + .port_ops = &vt6420_sata_ops, }; MODULE_AUTHOR("Jeff Garzik"); @@ -170,6 +202,81 @@ static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val) outl(val, ap->ioaddr.scr_addr + (4 * sc_reg)); } +/** + * vt6420_prereset - prereset for vt6420 + * @ap: target ATA port + * + * SCR registers on vt6420 are pieces of shit and may hang the + * whole machine completely if accessed with the wrong timing. + * To avoid such catastrophe, vt6420 doesn't provide generic SCR + * access operations, but uses SStatus and SControl only during + * boot probing in controlled way. + * + * As the old (pre EH update) probing code is proven to work, we + * strictly follow the access pattern. + * + * LOCKING: + * Kernel thread context (may sleep) + * + * RETURNS: + * 0 on success, -errno otherwise. + */ +static int vt6420_prereset(struct ata_port *ap) +{ + struct ata_eh_context *ehc = &ap->eh_context; + unsigned long timeout = jiffies + (HZ * 5); + u32 sstatus, scontrol; + int online; + + /* don't do any SCR stuff if we're not loading */ + if (!ATA_PFLAG_LOADING) + goto skip_scr; + + /* Resume phy. This is the old resume sequence from + * __sata_phy_reset(). + */ + svia_scr_write(ap, SCR_CONTROL, 0x300); + svia_scr_read(ap, SCR_CONTROL); /* flush */ + + /* wait for phy to become ready, if necessary */ + do { + msleep(200); + if ((svia_scr_read(ap, SCR_STATUS) & 0xf) != 1) + break; + } while (time_before(jiffies, timeout)); + + /* open code sata_print_link_status() */ + sstatus = svia_scr_read(ap, SCR_STATUS); + scontrol = svia_scr_read(ap, SCR_CONTROL); + + online = (sstatus & 0xf) == 0x3; + + ata_port_printk(ap, KERN_INFO, + "SATA link %s 1.5 Gbps (SStatus %X SControl %X)\n", + online ? "up" : "down", sstatus, scontrol); + + /* SStatus is read one more time */ + svia_scr_read(ap, SCR_STATUS); + + if (!online) { + /* tell EH to bail */ + ehc->i.action &= ~ATA_EH_RESET_MASK; + return 0; + } + + skip_scr: + /* wait for !BSY */ + ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT); + + return 0; +} + +static void vt6420_error_handler(struct ata_port *ap) +{ + return ata_bmdma_drive_eh(ap, vt6420_prereset, ata_std_softreset, + NULL, ata_std_postreset); +} + static const unsigned int svia_bar_sizes[] = { 8, 4, 8, 4, 16, 256 }; @@ -210,7 +317,7 @@ static void vt6421_init_addrs(struct ata_probe_ent *probe_ent, static struct ata_probe_ent *vt6420_init_probe_ent(struct pci_dev *pdev) { struct ata_probe_ent *probe_ent; - struct ata_port_info *ppi = &svia_port_info; + struct ata_port_info *ppi = &vt6420_port_info; probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY); if (!probe_ent) @@ -239,7 +346,7 @@ static struct ata_probe_ent *vt6421_init_probe_ent(struct pci_dev *pdev) probe_ent->sht = &svia_sht; probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY; - probe_ent->port_ops = &svia_sata_ops; + probe_ent->port_ops = &vt6421_sata_ops; probe_ent->n_ports = N_PORTS; probe_ent->irq = pdev->irq; probe_ent->irq_flags = IRQF_SHARED;