[PATCH] Necessary evil to get sata_vsc to initialize with Intel iq3124h hba

* libata does not care about error interrupts, so handle them locally
* the interrupts that are ignored only appear to happen at init time

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 29 insertions, 1 deletions

diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c
index 2e2c3b7acb0c..e484e8db6810 100644
--- a/drivers/scsi/sata_vsc.c
+++ b/drivers/scsi/sata_vsc.c
@@ -81,6 +81,19 @@
 /* Port stride */
 #define VSC_SATA_PORT_OFFSET            0x200
 
+/* Error interrupt status bit offsets */
+#define VSC_SATA_INT_ERROR_E_OFFSET     2
+#define VSC_SATA_INT_ERROR_P_OFFSET     4
+#define VSC_SATA_INT_ERROR_T_OFFSET     5
+#define VSC_SATA_INT_ERROR_M_OFFSET     1
+#define is_vsc_sata_int_err(port_idx, int_status) \
+         (int_status & ((1 << (VSC_SATA_INT_ERROR_E_OFFSET + (8 * port_idx))) | \
+                        (1 << (VSC_SATA_INT_ERROR_P_OFFSET + (8 * port_idx))) | \
+                        (1 << (VSC_SATA_INT_ERROR_T_OFFSET + (8 * port_idx))) | \
+                        (1 << (VSC_SATA_INT_ERROR_M_OFFSET + (8 * port_idx)))   \
+                       )\
+         )
+
 
 static u32 vsc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
 {
@@ -201,13 +214,28 @@ static irqreturn_t vsc_sata_interrupt (int irq, void *dev_instance,
                         struct ata_port *ap;
 
                         ap = host_set->ports[i];
+
+                        if (is_vsc_sata_int_err(i, int_status)) {
+                                u32 err_status;
+                                printk(KERN_DEBUG "%s: ignoring interrupt(s)\n", __FUNCTION__);
+                                err_status = ap ? vsc_sata_scr_read(ap, SCR_ERROR) : 0;
+                                vsc_sata_scr_write(ap, SCR_ERROR, err_status);
+                                handled++;
+                        }
+
                         if (ap && !(ap->flags &
                                     (ATA_FLAG_PORT_DISABLED|ATA_FLAG_NOINTR))) {
                                 struct ata_queued_cmd *qc;
 
                                 qc = ata_qc_from_tag(ap, ap->active_tag);
-                                if (qc && (!(qc->tf.ctl & ATA_NIEN)))
+                                if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
                                         handled += ata_host_intr(ap, qc);
+                                } else {
+                                        printk(KERN_DEBUG "%s: ignoring interrupt(s)\n", __FUNCTION__);
+                                        ata_chk_status(ap);
+                                        handled++;
+                                }
+
                         }
                 }
         }