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    Subject[11/39] pata_hpt3x2n: fix clock turnaround
    2.6.31-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Sergei Shtylyov <sshtylyov@ru.mvista.com>

    commit 256ace9bbd4cdb6d48d5f55d55d42fa20527fad1 upstream.

    The clock turnaround code still doesn't work for several reasons:

    - 'USE_DPLL' flag in 'ap->host->private_data' is never initialized
    or updated, so the driver can only set the chip to the DPLL clock
    mode, not the PCI mode;

    - the driver doesn't serialize access to the channels depending on
    the current clock mode like the vendor drivers, so the clock
    turnaround is only executed "optionally", not always as it should be;

    - the wrong ports are written to when hpt3x2n_set_clock() is called
    for the secondary channel;

    - hpt3x2n_set_clock() can inadvertently enable the disabled channels
    when resetting the channel state machines.

    Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
    Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    drivers/ata/pata_hpt3x2n.c | 64 ++++++++++++++++++++++++---------------------
    1 file changed, 35 insertions(+), 29 deletions(-)

    --- a/drivers/ata/pata_hpt3x2n.c
    +++ b/drivers/ata/pata_hpt3x2n.c
    @@ -8,7 +8,7 @@
    * Copyright (C) 1999-2003 Andre Hedrick <andre@linux-ide.org>
    * Portions Copyright (C) 2001 Sun Microsystems, Inc.
    * Portions Copyright (C) 2003 Red Hat Inc
    - * Portions Copyright (C) 2005-2007 MontaVista Software, Inc.
    + * Portions Copyright (C) 2005-2009 MontaVista Software, Inc.
    *
    *
    * TODO
    @@ -25,7 +25,7 @@
    #include <linux/libata.h>

    #define DRV_NAME "pata_hpt3x2n"
    -#define DRV_VERSION "0.3.7"
    +#define DRV_VERSION "0.3.8"

    enum {
    HPT_PCI_FAST = (1 << 31),
    @@ -262,7 +262,7 @@ static void hpt3x2n_bmdma_stop(struct at

    static void hpt3x2n_set_clock(struct ata_port *ap, int source)
    {
    - void __iomem *bmdma = ap->ioaddr.bmdma_addr;
    + void __iomem *bmdma = ap->ioaddr.bmdma_addr - ap->port_no * 8;

    /* Tristate the bus */
    iowrite8(0x80, bmdma+0x73);
    @@ -272,9 +272,9 @@ static void hpt3x2n_set_clock(struct ata
    iowrite8(source, bmdma+0x7B);
    iowrite8(0xC0, bmdma+0x79);

    - /* Reset state machines */
    - iowrite8(0x37, bmdma+0x70);
    - iowrite8(0x37, bmdma+0x74);
    + /* Reset state machines, avoid enabling the disabled channels */
    + iowrite8(ioread8(bmdma+0x70) | 0x32, bmdma+0x70);
    + iowrite8(ioread8(bmdma+0x74) | 0x32, bmdma+0x74);

    /* Complete reset */
    iowrite8(0x00, bmdma+0x79);
    @@ -284,21 +284,10 @@ static void hpt3x2n_set_clock(struct ata
    iowrite8(0x00, bmdma+0x77);
    }

    -/* Check if our partner interface is busy */
    -
    -static int hpt3x2n_pair_idle(struct ata_port *ap)
    -{
    - struct ata_host *host = ap->host;
    - struct ata_port *pair = host->ports[ap->port_no ^ 1];
    -
    - if (pair->hsm_task_state == HSM_ST_IDLE)
    - return 1;
    - return 0;
    -}
    -
    static int hpt3x2n_use_dpll(struct ata_port *ap, int writing)
    {
    long flags = (long)ap->host->private_data;
    +
    /* See if we should use the DPLL */
    if (writing)
    return USE_DPLL; /* Needed for write */
    @@ -307,20 +296,35 @@ static int hpt3x2n_use_dpll(struct ata_p
    return 0;
    }

    +static int hpt3x2n_qc_defer(struct ata_queued_cmd *qc)
    +{
    + struct ata_port *ap = qc->ap;
    + struct ata_port *alt = ap->host->ports[ap->port_no ^ 1];
    + int rc, flags = (long)ap->host->private_data;
    + int dpll = hpt3x2n_use_dpll(ap, qc->tf.flags & ATA_TFLAG_WRITE);
    +
    + /* First apply the usual rules */
    + rc = ata_std_qc_defer(qc);
    + if (rc != 0)
    + return rc;
    +
    + if ((flags & USE_DPLL) != dpll && alt->qc_active)
    + return ATA_DEFER_PORT;
    + return 0;
    +}
    +
    static unsigned int hpt3x2n_qc_issue(struct ata_queued_cmd *qc)
    {
    - struct ata_taskfile *tf = &qc->tf;
    struct ata_port *ap = qc->ap;
    int flags = (long)ap->host->private_data;
    + int dpll = hpt3x2n_use_dpll(ap, qc->tf.flags & ATA_TFLAG_WRITE);

    - if (hpt3x2n_pair_idle(ap)) {
    - int dpll = hpt3x2n_use_dpll(ap, (tf->flags & ATA_TFLAG_WRITE));
    - if ((flags & USE_DPLL) != dpll) {
    - if (dpll == 1)
    - hpt3x2n_set_clock(ap, 0x21);
    - else
    - hpt3x2n_set_clock(ap, 0x23);
    - }
    + if ((flags & USE_DPLL) != dpll) {
    + flags &= ~USE_DPLL;
    + flags |= dpll;
    + ap->host->private_data = (void *)(long)flags;
    +
    + hpt3x2n_set_clock(ap, dpll ? 0x21 : 0x23);
    }
    return ata_sff_qc_issue(qc);
    }
    @@ -337,6 +341,8 @@ static struct ata_port_operations hpt3x2
    .inherits = &ata_bmdma_port_ops,

    .bmdma_stop = hpt3x2n_bmdma_stop,
    +
    + .qc_defer = hpt3x2n_qc_defer,
    .qc_issue = hpt3x2n_qc_issue,

    .cable_detect = hpt3x2n_cable_detect,
    @@ -454,7 +460,7 @@ static int hpt3x2n_init_one(struct pci_d
    unsigned int f_low, f_high;
    int adjust;
    unsigned long iobase = pci_resource_start(dev, 4);
    - void *hpriv = NULL;
    + void *hpriv = (void *)USE_DPLL;
    int rc;

    rc = pcim_enable_device(dev);
    @@ -542,7 +548,7 @@ static int hpt3x2n_init_one(struct pci_d
    /* Set our private data up. We only need a few flags so we use
    it directly */
    if (pci_mhz > 60) {
    - hpriv = (void *)PCI66;
    + hpriv = (void *)(PCI66 | USE_DPLL);
    /*
    * On HPT371N, if ATA clock is 66 MHz we must set bit 2 in
    * the MISC. register to stretch the UltraDMA Tss timing.



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