Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c5038fc05d4aa4ae0671776199459690e4c973cb
Commit:     c5038fc05d4aa4ae0671776199459690e4c973cb
Parent:     a5df2eabdae7cd7840d59cffe621b3658a3a70cb
Author:     Alan Cox <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 25 14:21:16 2007 +0100
Committer:  Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Wed Jan 23 05:24:15 2008 -0500

    libata/pata_it821x: Improve handling of poorly compatible emulations
    
    Some it821x RAID firmwares return 0 for the err return off both devices.
    A similar issue occurs with the slave returning 0 not 1 if you plug a
    gigabyte sata ramdisk into a controller that fakes two SATA ports as
    master/slave on an SFF channel.
    
    The patch does the following
    
    - Allow the 'failed diagnostics' case on both master and slave
    - Move the HORKAGE_DIAGNOSTIC check after ->dev_config
    
    This second change also allows IT821x to fix up a problem where we report
    drive diagnostic failures when in fact the drive is fine but the
    microcontroller firmware doesn't appear to get it right. IT821x clears
    the flag again to avoid giving the user bogus warnings about their disk.
    
    The other IT821x change is a bit ugly, we slightly abuse the cable type
    hook to fiddle with the identify data for the devices. We could add a new
    hook for this but as we have only one offender and no more seeming likely
    it seems better to keep libata-core clean.
    
    Please let this sit in -mm briefly, just in case the relaxed checking
    breaks some other emulated interface.
    
    Signed-off-by: Alan Cox <[EMAIL PROTECTED]>
    Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
 drivers/ata/libata-core.c |   36 ++++++++++++++++++++----------------
 drivers/ata/pata_it821x.c |   35 +++++++++++++++++++++++++++++++++--
 2 files changed, 53 insertions(+), 18 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index ee72994..627703c 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -950,8 +950,8 @@ unsigned int ata_dev_try_classify(struct ata_device *dev, 
int present,
        if (r_err)
                *r_err = err;
 
-       /* see if device passed diags: if master then continue and warn later */
-       if (err == 0 && dev->devno == 0)
+       /* see if device passed diags: continue and warn later */
+       if (err == 0)
                /* diagnostic fail : do nothing _YET_ */
                dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
        else if (err == 1)
@@ -2262,19 +2262,8 @@ int ata_dev_configure(struct ata_device *dev)
                        dev->flags |= ATA_DFLAG_DIPM;
        }
 
-       if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
-               /* Let the user know. We don't want to disallow opens for
-                  rescue purposes, or in case the vendor is just a blithering
-                  idiot */
-               if (print_info) {
-                       ata_dev_printk(dev, KERN_WARNING,
-"Drive reports diagnostics failure. This may indicate a drive\n");
-                       ata_dev_printk(dev, KERN_WARNING,
-"fault or invalid emulation. Contact drive vendor for information.\n");
-               }
-       }
-
-       /* limit bridge transfers to udma5, 200 sectors */
+       /* Limit PATA drive on SATA cable bridge transfers to udma5,
+          200 sectors */
        if (ata_dev_knobble(dev)) {
                if (ata_msg_drv(ap) && print_info)
                        ata_dev_printk(dev, KERN_INFO,
@@ -2303,6 +2292,21 @@ int ata_dev_configure(struct ata_device *dev)
        if (ap->ops->dev_config)
                ap->ops->dev_config(dev);
 
+       if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
+               /* Let the user know. We don't want to disallow opens for
+                  rescue purposes, or in case the vendor is just a blithering
+                  idiot. Do this after the dev_config call as some controllers
+                  with buggy firmware may want to avoid reporting false device
+                  bugs */
+
+               if (print_info) {
+                       ata_dev_printk(dev, KERN_WARNING,
+"Drive reports diagnostics failure. This may indicate a drive\n");
+                       ata_dev_printk(dev, KERN_WARNING,
+"fault or invalid emulation. Contact drive vendor for information.\n");
+               }
+       }
+
        if (ata_msg_probe(ap))
                ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
                        __FUNCTION__, ata_chk_status(ap));
@@ -3066,7 +3070,7 @@ static int ata_dev_set_mode(struct ata_device *dev)
 
        /* Early MWDMA devices do DMA but don't allow DMA mode setting.
           Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
-       if (dev->xfer_shift == ATA_SHIFT_MWDMA && 
+       if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
            dev->dma_mode == XFER_MW_DMA_0 &&
            (dev->id[63] >> 8) & 1)
                err_mask &= ~AC_ERR_DEV;
diff --git a/drivers/ata/pata_it821x.c b/drivers/ata/pata_it821x.c
index ca9aae0..109ddd4 100644
--- a/drivers/ata/pata_it821x.c
+++ b/drivers/ata/pata_it821x.c
@@ -430,7 +430,7 @@ static unsigned int it821x_smart_qc_issue_prot(struct 
ata_queued_cmd *qc)
                        return ata_qc_issue_prot(qc);
        }
        printk(KERN_DEBUG "it821x: can't process command 0x%02X\n", 
qc->tf.command);
-       return AC_ERR_INVALID;
+       return AC_ERR_DEV;
 }
 
 /**
@@ -516,6 +516,37 @@ static void it821x_dev_config(struct ata_device *adev)
                        printk("(%dK stripe)", adev->id[146]);
                printk(".\n");
        }
+       /* This is a controller firmware triggered funny, don't
+          report the drive faulty! */
+       adev->horkage &= ~ATA_HORKAGE_DIAGNOSTIC;
+}
+
+/**
+ *     it821x_ident_hack       -       Hack identify data up
+ *     @ap: Port
+ *
+ *     Walk the devices on this firmware driven port and slightly
+ *     mash the identify data to stop us and common tools trying to
+ *     use features not firmware supported. The firmware itself does
+ *     some masking (eg SMART) but not enough.
+ *
+ *     This is a bit of an abuse of the cable method, but it is the
+ *     only method called at the right time. We could modify the libata
+ *     core specifically for ident hacking but while we have one offender
+ *     it seems better to keep the fallout localised.
+ */
+
+static int it821x_ident_hack(struct ata_port *ap)
+{
+       struct ata_device *adev;
+       ata_link_for_each_dev(adev, &ap->link) {
+               if (ata_dev_enabled(adev)) {
+                       adev->id[84] &= ~(1 << 6);      /* No FUA */
+                       adev->id[85] &= ~(1 << 10);     /* No HPA */
+                       adev->id[76] = 0;               /* No NCQ/AN etc */
+               }
+       }
+       return ata_cable_unknown(ap);
 }
 
 
@@ -634,7 +665,7 @@ static struct ata_port_operations it821x_smart_port_ops = {
        .thaw           = ata_bmdma_thaw,
        .error_handler  = ata_bmdma_error_handler,
        .post_internal_cmd = ata_bmdma_post_internal_cmd,
-       .cable_detect   = ata_cable_unknown,
+       .cable_detect   = it821x_ident_hack,
 
        .bmdma_setup    = ata_bmdma_setup,
        .bmdma_start    = ata_bmdma_start,
-
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