Two more things.
On Thu, Jun 19, 2014 at 12:20:54PM +0530, Suman Tripathi wrote:
> /**
> + * xgene_ahci_qc_issue - Issue commands to the device
> + * @qc: Command to issue
> + *
> + * Due to H/W errata, for the IENTIFY DEVICE command
> + * controller is unable to clear the BSY bit after
> + * receiving the PIO setup FIS and results the dma
> + * state machine to go into the CMFatalErrorUpdate
> + * state resulting in the dma state machine lockup.
> + * By restarting the dma engine to move it removes
> + * the controller out of lock up state.
Please re-flow it to 75th or so column.
> + */
> +static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc)
> +{
> + struct ata_port *ap = qc->ap;
> + void __iomem *port_mmio = ahci_port_base(ap);
> + struct ahci_port_priv *pp = ap->private_data;
> + struct ahci_host_priv *hpriv = ap->host->private_data;
> + struct xgene_ahci_context *ctx = hpriv->plat_data;
> +
> + /* Keep track of the currently active link. It will be used
> + * in completion path to determine whether NCQ phase is in
> + * progress.
> + */
> + pp->active_link = qc->dev->link;
> +
> + /*
> + * Restart the dma engine if the last cmd issued
> + * is IDENTIFY DEVICE command
> + */
> + if (unlikely(ctx->last_cmd[ap->port_no] == ATA_CMD_ID_ATA))
> + ahci_restart_engine(ap);
> +
> + if (qc->tf.protocol == ATA_PROT_NCQ)
> + writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
> +
> + if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
> + u32 fbs = readl(port_mmio + PORT_FBS);
> + fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
> + fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
> + writel(fbs, port_mmio + PORT_FBS);
> + pp->fbs_last_dev = qc->dev->link->pmp;
> + }
> +
> + writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
> +
> + /* Save the last command issued */
> + ctx->last_cmd[ap->port_no] = qc->tf.command;
> +
> + ahci_sw_activity(qc->dev->link);
> +
> + return 0;
> +}
Why copy the whole function body? Can't you do the following?
static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc)
{
unsigned int ret;
if (unlikely(last_cmd == IDENTIFY))
ahci_restart_engine(ap);
ret = ahci_qc_issue(qc);
last_cmd = qc->tf.command;
return ret;
}
Thanks.
--
tejun
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