[PATCH] ahci: ignore PORT_IRQ_IF_ERR on JMB controllers

JMicron AHCI controllers set PORT_IRQ_IF_ERR on device errors.  The
IRQ status bit indicates interface error or protocol mismatch and ahci
driver interprets it into AC_ERR_ATA_BUS.  So, whenever an ATAPI
device raises check condition, ahci interprets it as ATA bus error and
thus resets it which, in turn, raises check condition thus creating a
reset loop and rendering the device unuseable.

This patch makes JMB controllers ignore PORT_IRQ_IF_ERR when
interpreting error condition.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Justin Tsai <justin@jmicron.com>

1 files changed, 22 insertions, 5 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index f510e1196dc6..bddb14e91d3c 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -78,6 +78,7 @@ enum {
 
         board_ahci              = 0,
         board_ahci_vt8251       = 1,
+        board_ahci_ign_iferr    = 2,
 
         /* global controller registers */
         HOST_CAP                = 0x00, /* host capabilities */
@@ -168,6 +169,7 @@ enum {
         /* ap->flags bits */
         AHCI_FLAG_RESET_NEEDS_CLO       = (1 << 24),
         AHCI_FLAG_NO_NCQ                = (1 << 25),
+        AHCI_FLAG_IGN_IRQ_IF_ERR        = (1 << 26), /* ignore IRQ_IF_ERR */
 };
 
 struct ahci_cmd_hdr {
@@ -295,6 +297,17 @@ static const struct ata_port_info ahci_port_info[] = {
                 .udma_mask      = 0x7f, /* udma0-6 ; FIXME */
                 .port_ops       = &ahci_ops,
         },
+        /* board_ahci_ign_iferr */
+        {
+                .sht            = &ahci_sht,
+                .flags          = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+                                  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+                                  ATA_FLAG_SKIP_D2H_BSY |
+                                  AHCI_FLAG_IGN_IRQ_IF_ERR,
+                .pio_mask       = 0x1f, /* pio0-4 */
+                .udma_mask      = 0x7f, /* udma0-6 ; FIXME */
+                .port_ops       = &ahci_ops,
+        },
 };
 
 static const struct pci_device_id ahci_pci_tbl[] = {
@@ -327,11 +340,11 @@ static const struct pci_device_id ahci_pci_tbl[] = {
         { PCI_VDEVICE(INTEL, 0x294e), board_ahci }, /* ICH9M */
 
         /* JMicron */
-        { PCI_VDEVICE(JMICRON, 0x2360), board_ahci }, /* JMicron JMB360 */
-        { PCI_VDEVICE(JMICRON, 0x2361), board_ahci }, /* JMicron JMB361 */
-        { PCI_VDEVICE(JMICRON, 0x2363), board_ahci }, /* JMicron JMB363 */
-        { PCI_VDEVICE(JMICRON, 0x2365), board_ahci }, /* JMicron JMB365 */
-        { PCI_VDEVICE(JMICRON, 0x2366), board_ahci }, /* JMicron JMB366 */
+        { PCI_VDEVICE(JMICRON, 0x2360), board_ahci_ign_iferr }, /* JMB360 */
+        { PCI_VDEVICE(JMICRON, 0x2361), board_ahci_ign_iferr }, /* JMB361 */
+        { PCI_VDEVICE(JMICRON, 0x2363), board_ahci_ign_iferr }, /* JMB363 */
+        { PCI_VDEVICE(JMICRON, 0x2365), board_ahci_ign_iferr }, /* JMB365 */
+        { PCI_VDEVICE(JMICRON, 0x2366), board_ahci_ign_iferr }, /* JMB366 */
 
         /* ATI */
         { PCI_VDEVICE(ATI, 0x4380), board_ahci }, /* ATI SB600 non-raid */
@@ -980,6 +993,10 @@ static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
         /* analyze @irq_stat */
         ata_ehi_push_desc(ehi, "irq_stat 0x%08x", irq_stat);
 
+        /* some controllers set IRQ_IF_ERR on device errors, ignore it */
+        if (ap->flags & AHCI_FLAG_IGN_IRQ_IF_ERR)
+                irq_stat &= ~PORT_IRQ_IF_ERR;
+
         if (irq_stat & PORT_IRQ_TF_ERR)
                 err_mask |= AC_ERR_DEV;