[PATCH 2/4] libata sata_qstor nuke idle state

[Mark Lord]

sata_qstor nuke idle state.

We're really only ever in one of two hardware states:  packet, or mmio.
Get rid of unnecessary "qs_state_idle" state.

This belongs in 2.6.24.

Signed-off-by:  Mark Lord <[EMAIL PROTECTED]>
---

--- old/drivers/ata/sata_qstor.c        2007-11-07 07:41:28.000000000 -0500
+++ linux/drivers/ata/sata_qstor.c      2007-11-07 08:06:29.000000000 -0500
@@ -103,7 +103,7 @@
        QS_DMA_BOUNDARY         = ~0UL
};

-typedef enum { qs_state_idle, qs_state_pkt, qs_state_mmio } qs_state_t;
+typedef enum { qs_state_mmio, qs_state_pkt } qs_state_t;

struct qs_port_priv {
        u8                      *pkt;
@@ -222,7 +222,9 @@
static inline void qs_enter_reg_mode(struct ata_port *ap)
{
        u8 __iomem *chan = qs_mmio_base(ap->host) + (ap->port_no * 0x4000);
+       struct qs_port_priv *pp = ap->private_data;

+       pp->state = qs_state_mmio;
        writeb(QS_CTR0_REG, chan + QS_CCT_CTR0);
        readb(chan + QS_CCT_CTR0);        /* flush */
}
@@ -238,19 +240,12 @@

static void qs_phy_reset(struct ata_port *ap)
{
-       struct qs_port_priv *pp = ap->private_data;
-
-       pp->state = qs_state_idle;
        qs_reset_channel_logic(ap);
        sata_phy_reset(ap);
}

static void qs_eng_timeout(struct ata_port *ap)
{
-       struct qs_port_priv *pp = ap->private_data;
-
-       if (pp->state != qs_state_idle) /* healthy paranoia */
-               pp->state = qs_state_mmio;
        qs_reset_channel_logic(ap);
        ata_eng_timeout(ap);
}
@@ -409,7 +404,6 @@
                                        switch (sHST) {
                                        case 0: /* successful CPB */
                                        case 3: /* device error */
-                                               pp->state = qs_state_idle;
                                                qs_enter_reg_mode(qc->ap);
                                                qc->err_mask |= 
ac_err_mask(sDST);
                                                ata_qc_complete(qc);
@@ -448,7 +442,6 @@
                                        ap->print_id, qc->tf.protocol, status);

                                /* complete taskfile transaction */
-                               pp->state = qs_state_idle;
                                qc->err_mask |= ac_err_mask(status);
                                ata_qc_complete(qc);
                                handled = 1;
@@ -504,7 +497,6 @@
        rc = ata_port_start(ap);
        if (rc)
                return rc;
-       qs_enter_reg_mode(ap);
        pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
        if (!pp)
                return -ENOMEM;
@@ -515,6 +507,7 @@
        memset(pp->pkt, 0, QS_PKT_BYTES);
        ap->private_data = pp;

+       qs_enter_reg_mode(ap);
        addr = (u64)pp->pkt_dma;
        writel((u32) addr,        chan + QS_CCF_CPBA);
        writel((u32)(addr >> 32), chan + QS_CCF_CPBA + 4);
-
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