[PATCH] sata_sil24: convert to new probing mechanism and add hotplug support

Convert to new probing mechanism and add hotplug support by enabling
PORT_IRQ_PHYRDY_CHG, marking ehi for hotplug and scheduling EH on
PORT_IRQ_PHYRDY_CHG or PORT_IRQ_DEV_XCHG.

Sil3124/32 family of controllers don't have any mechanism to wait for
the first D2H FIS after hotplug, so ATA_FLAG_SKIP_D2H_BSY is used.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 8 insertions, 19 deletions

diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
index d4ca6d6b402c..97e93392f928 100644
--- a/drivers/scsi/sata_sil24.c
+++ b/drivers/scsi/sata_sil24.c
@@ -159,7 +159,8 @@ enum {
         PORT_IRQ_SDB_NOTIFY     = (1 << 11), /* SDB notify received */
 
         DEF_PORT_IRQ            = PORT_IRQ_COMPLETE | PORT_IRQ_ERROR |
-                                  PORT_IRQ_DEV_XCHG | PORT_IRQ_UNK_FIS,
+                                  PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG |
+                                  PORT_IRQ_UNK_FIS,
 
         /* bits[27:16] are unmasked (raw) */
         PORT_IRQ_RAW_SHIFT      = 16,
@@ -228,7 +229,7 @@ enum {
         /* host flags */
         SIL24_COMMON_FLAGS      = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
                                   ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
-                                  ATA_FLAG_NCQ,
+                                  ATA_FLAG_NCQ | ATA_FLAG_SKIP_D2H_BSY,
         SIL24_FLAG_PCIX_IRQ_WOC = (1 << 24), /* IRQ loss errata on PCI-X */
 
         IRQ_STAT_4PORTS         = 0xf,
@@ -325,7 +326,6 @@ static u8 sil24_check_status(struct ata_port *ap);
 static u32 sil24_scr_read(struct ata_port *ap, unsigned sc_reg);
 static void sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val);
 static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
-static int sil24_probe_reset(struct ata_port *ap, unsigned int *classes);
 static void sil24_qc_prep(struct ata_queued_cmd *qc);
 static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc);
 static void sil24_irq_clear(struct ata_port *ap);
@@ -385,8 +385,6 @@ static const struct ata_port_operations sil24_ops = {
 
         .tf_read                = sil24_tf_read,
 
-        .probe_reset            = sil24_probe_reset,
-
         .qc_prep                = sil24_qc_prep,
         .qc_issue               = sil24_qc_issue,
 
@@ -635,13 +633,6 @@ static int sil24_hardreset(struct ata_port *ap, unsigned int *class)
         return -EIO;
 }
 
-static int sil24_probe_reset(struct ata_port *ap, unsigned int *classes)
-{
-        return ata_drive_probe_reset(ap, ata_std_probeinit,
-                                     sil24_softreset, sil24_hardreset,
-                                     ata_std_postreset, classes);
-}
-
 static inline void sil24_fill_sg(struct ata_queued_cmd *qc,
                                  struct sil24_sge *sge)
 {
@@ -772,13 +763,11 @@ static void sil24_error_intr(struct ata_port *ap)
 
         ata_ehi_push_desc(ehi, "irq_stat 0x%08x", irq_stat);
 
-        if (irq_stat & PORT_IRQ_DEV_XCHG) {
-                ehi->err_mask |= AC_ERR_ATA_BUS;
-                /* sil24 doesn't recover very well from phy
-                 * disconnection with a softreset.  Force hardreset.
-                 */
-                ehi->action |= ATA_EH_HARDRESET;
-                ata_ehi_push_desc(ehi, ", device_exchanged");
+        if (irq_stat & (PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG)) {
+                ata_ehi_hotplugged(ehi);
+                ata_ehi_push_desc(ehi, ", %s",
+                               irq_stat & PORT_IRQ_PHYRDY_CHG ?
+                               "PHY RDY changed" : "device exchanged");
                 freeze = 1;
         }