[PATCH] sata_sil: disable hotplug interrupts on two ATI IXPs

Some SATA controllers embedded in ATI IXPs seem to have broken
SATA_IRQ bit in their bmdma2 registers which is always stuck at 1.
This makes the driver believe that there has been a hotplug event and
freeze the port whenever there's an interrupt thus failing all
commands.

This patch disables SATA_IRQ for those controllers.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 23 insertions, 6 deletions

diff --git a/drivers/scsi/sata_sil.c b/drivers/scsi/sata_sil.c
index 662ad10de288..51d86d750e84 100644
--- a/drivers/scsi/sata_sil.c
+++ b/drivers/scsi/sata_sil.c
@@ -52,6 +52,7 @@ enum {
         /*
          * host flags
          */
+        SIL_FLAG_NO_SATA_IRQ    = (1 << 28),
         SIL_FLAG_RERR_ON_DMA_ACT = (1 << 29),
         SIL_FLAG_MOD15WRITE     = (1 << 30),
 
@@ -62,8 +63,9 @@ enum {
          * Controller IDs
          */
         sil_3112                = 0,
-        sil_3512                = 1,
-        sil_3114                = 2,
+        sil_3112_no_sata_irq    = 1,
+        sil_3512                = 2,
+        sil_3114                = 3,
 
         /*
          * Register offsets
@@ -123,8 +125,8 @@ static const struct pci_device_id sil_pci_tbl[] = {
         { 0x1095, 0x3512, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3512 },
         { 0x1095, 0x3114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3114 },
         { 0x1002, 0x436e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112 },
-        { 0x1002, 0x4379, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112 },
-        { 0x1002, 0x437a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112 },
+        { 0x1002, 0x4379, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112_no_sata_irq },
+        { 0x1002, 0x437a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112_no_sata_irq },
         { }     /* terminate list */
 };
 
@@ -217,6 +219,16 @@ static const struct ata_port_info sil_port_info[] = {
                 .udma_mask      = 0x3f,                 /* udma0-5 */
                 .port_ops       = &sil_ops,
         },
+        /* sil_3112_no_sata_irq */
+        {
+                .sht            = &sil_sht,
+                .host_flags     = SIL_DFL_HOST_FLAGS | SIL_FLAG_MOD15WRITE |
+                                  SIL_FLAG_NO_SATA_IRQ,
+                .pio_mask       = 0x1f,                 /* pio0-4 */
+                .mwdma_mask     = 0x07,                 /* mwdma0-2 */
+                .udma_mask      = 0x3f,                 /* udma0-5 */
+                .port_ops       = &sil_ops,
+        },
         /* sil_3512 */
         {
                 .sht            = &sil_sht,
@@ -437,6 +449,10 @@ static irqreturn_t sil_interrupt(int irq, void *dev_instance,
                 if (unlikely(!ap || ap->flags & ATA_FLAG_DISABLED))
                         continue;
 
+                /* turn off SATA_IRQ if not supported */
+                if (ap->flags & SIL_FLAG_NO_SATA_IRQ)
+                        bmdma2 &= ~SIL_DMA_SATA_IRQ;
+
                 if (bmdma2 == 0xffffffff ||
                     !(bmdma2 & (SIL_DMA_COMPLETE | SIL_DMA_SATA_IRQ)))
                         continue;
@@ -474,8 +490,9 @@ static void sil_thaw(struct ata_port *ap)
         ata_chk_status(ap);
         ata_bmdma_irq_clear(ap);
 
-        /* turn on SATA IRQ */
-        writel(SIL_SIEN_N, mmio_base + sil_port[ap->port_no].sien);
+        /* turn on SATA IRQ if supported */
+        if (!(ap->flags & SIL_FLAG_NO_SATA_IRQ))
+                writel(SIL_SIEN_N, mmio_base + sil_port[ap->port_no].sien);
 
         /* turn on IRQ */
         tmp = readl(mmio_base + SIL_SYSCFG);