Convert to new probing mechanism and add hotplug support by enabling
PORT_IRQ_PHYRDY, marking ehi for hotplug and scheduling EH on
CONNECT/PHYRDY interrupts.
Unfortunately, ahci cannot reliably wait for the first FIS34 after
hotplug. It sometimes succeeds but times out more often than not, so
ATA_FLAG_CANT_WAIT_FIS34 is used.
This patch also fixes ahci_hardreset() such that D2H Register FIS RX
area is cleared before issuing COMRESET. Without this,
ata_busy_sleep() after COMRESET might prematually finish if the
previous TF contains DRDY && !BSY.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/scsi/ahci.c | 47 +++++++++++++++++++++++++++--------------------
1 files changed, 27 insertions(+), 20 deletions(-)
8cf0cb52955e53d055c16c85b648c5b9b9ef2679
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 60f455b..1fd1aa0 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -136,6 +136,7 @@ enum {
PORT_IRQ_FREEZE = PORT_IRQ_HBUS_ERR |
PORT_IRQ_IF_ERR |
PORT_IRQ_CONNECT |
+ PORT_IRQ_PHYRDY |
PORT_IRQ_UNK_FIS,
PORT_IRQ_ERROR = PORT_IRQ_FREEZE |
PORT_IRQ_TF_ERR |
@@ -200,7 +201,6 @@ static void ahci_scr_write (struct ata_p
static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
static irqreturn_t ahci_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
-static int ahci_probe_reset(struct ata_port *ap, unsigned int *classes);
static void ahci_irq_clear(struct ata_port *ap);
static int ahci_port_start(struct ata_port *ap);
static void ahci_port_stop(struct ata_port *ap);
@@ -241,8 +241,6 @@ static const struct ata_port_operations
.tf_read = ahci_tf_read,
- .probe_reset = ahci_probe_reset,
-
.qc_prep = ahci_qc_prep,
.qc_issue = ahci_qc_issue,
@@ -267,7 +265,8 @@ static const struct ata_port_info ahci_p
{
.sht = &ahci_sht,
.host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
- ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA,
+ ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+ ATA_FLAG_SKIP_D2H_BSY,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
.port_ops = &ahci_ops,
@@ -277,6 +276,7 @@ static const struct ata_port_info ahci_p
.sht = &ahci_sht,
.host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+ ATA_FLAG_SKIP_D2H_BSY |
AHCI_FLAG_RESET_NEEDS_CLO,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
@@ -569,6 +569,17 @@ static int ahci_clo(struct ata_port *ap)
return 0;
}
+static int ahci_prereset(struct ata_port *ap)
+{
+ if ((ap->flags & AHCI_FLAG_RESET_NEEDS_CLO) &&
+ (ata_busy_wait(ap, ATA_BUSY, 1000) & ATA_BUSY)) {
+ /* ATA_BUSY hasn't cleared, so send a CLO */
+ ahci_clo(ap);
+ }
+
+ return ata_std_prereset(ap);
+}
+
static int ahci_softreset(struct ata_port *ap, unsigned int *class)
{
struct ahci_port_priv *pp = ap->private_data;
@@ -678,12 +689,22 @@ static int ahci_softreset(struct ata_por
static int ahci_hardreset(struct ata_port *ap, unsigned int *class)
{
+ struct ahci_port_priv *pp = ap->private_data;
+ u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
+ struct ata_taskfile tf;
int rc;
DPRINTK("ENTER\n");
ahci_stop_engine(ap);
+
+ /* clear D2H reception area to properly wait for FIS34 */
+ ata_tf_init(ap->device, &tf);
+ tf.command = 0xff;
+ ata_tf_to_fis(&tf, d2h_fis, 0);
+
rc = sata_std_hardreset(ap, class);
+
ahci_start_engine(ap);
if (rc == 0 && ata_port_online(ap))
@@ -714,19 +735,6 @@ static void ahci_postreset(struct ata_po
}
}
-static int ahci_probe_reset(struct ata_port *ap, unsigned int *classes)
-{
- if ((ap->flags & AHCI_FLAG_RESET_NEEDS_CLO) &&
- (ata_busy_wait(ap, ATA_BUSY, 1000) & ATA_BUSY)) {
- /* ATA_BUSY hasn't cleared, so send a CLO */
- ahci_clo(ap);
- }
-
- return ata_drive_probe_reset(ap, ata_std_probeinit,
- ahci_softreset, ahci_hardreset,
- ahci_postreset, classes);
-}
-
static u8 ahci_check_status(struct ata_port *ap)
{
void __iomem *mmio = (void __iomem *) ap->ioaddr.cmd_addr;
@@ -839,8 +847,7 @@ static void ahci_error_intr(struct ata_p
}
if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
- err_mask |= AC_ERR_ATA_BUS;
- action |= ATA_EH_SOFTRESET;
+ ata_ehi_hotplugged(ehi);
ata_ehi_push_desc(ehi, ", %s", irq_stat & PORT_IRQ_CONNECT ?
"connection status changed" : "PHY RDY changed");
}
@@ -1027,7 +1034,7 @@ static void ahci_error_handler(struct at
}
/* perform recovery */
- ata_do_eh(ap, ata_std_prereset, ahci_softreset, ahci_hardreset,
+ ata_do_eh(ap, ahci_prereset, ahci_softreset, ahci_hardreset,
ahci_postreset);
}
--
1.3.2
-
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