Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev: (35 commits)
  [libata] Improve timeout handling
  [libata] Drain data on errors
  pata_sc1200: Activate secondary channel
  pata_artop: Serializing support
  [libata] ahci: correct enclosure LED state save
  [libata] More robust parsing for IDENTIFY DEVICE multi_count field
  sata_mv: fix LED blinking for SoC+NCQ
  sata_mv: optimize IRQ coalescing for 8-port chips
  sata_mv: implement IRQ coalescing (v2)
  sata_mv: cosmetic preparations for IRQ coalescing
  pata-rb532-cf: platform_get_irq() fix ignored failure
  pata_efar: fix *dma_mask
  pata_radisys: fix mwdma_mask to exclude mwdma0
  [libata] convert drivers to use ata.h mode mask defines
  include/linux/ata.h: add some more transfer masks
  ahci: Blacklist HP Compaq 6720s that spins off disks during ACPI power off
  [libata] sata_mv: Implement direct FIS transmission via mv_qc_issue_fis().
  [libata] Export ata_pio_queue_task() so that it can be used from sata_mv.
  [libata] sata_mv: Add a new mv_sff_check_status() function to sata_mv.
  [libata] sata_mv: Tighten up interrupt masking in mv_qc_issue()
  ...

1 files changed, 30 insertions, 5 deletions

diff --git a/drivers/ata/pata_sc1200.c b/drivers/ata/pata_sc1200.c
index 9a4bdca5461..f49814d6fd2 100644
--- a/drivers/ata/pata_sc1200.c
+++ b/drivers/ata/pata_sc1200.c
@@ -2,7 +2,6 @@
  * New ATA layer SC1200 driver		Alan Cox <alan@lxorguk.ukuu.org.uk>
  *
  * TODO: Mode selection filtering
- * TODO: Can't enable second channel until ATA core has serialize
  * TODO: Needs custom DMA cleanup code
  *
  * Based very heavily on
@@ -178,6 +177,31 @@ static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
 	return ata_sff_qc_issue(qc);
 }
 
+/**
+ *	sc1200_qc_defer	-	implement serialization
+ *	@qc: command
+ *
+ *	Serialize command issue on this controller.
+ */
+
+static int sc1200_qc_defer(struct ata_queued_cmd *qc)
+{
+	struct ata_host *host = qc->ap->host;
+	struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
+	int rc;
+
+	/* First apply the usual rules */
+	rc = ata_std_qc_defer(qc);
+	if (rc != 0)
+		return rc;
+
+	/* Now apply serialization rules. Only allow a command if the
+	   other channel state machine is idle */
+	if (alt && alt->qc_active)
+		return	ATA_DEFER_PORT;
+	return 0;
+}
+
 static struct scsi_host_template sc1200_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 	.sg_tablesize	= LIBATA_DUMB_MAX_PRD,
@@ -187,6 +211,7 @@ static struct ata_port_operations sc1200_port_ops = {
 	.inherits	= &ata_bmdma_port_ops,
 	.qc_prep 	= ata_sff_dumb_qc_prep,
 	.qc_issue	= sc1200_qc_issue,
+	.qc_defer	= sc1200_qc_defer,
 	.cable_detect	= ata_cable_40wire,
 	.set_piomode	= sc1200_set_piomode,
 	.set_dmamode	= sc1200_set_dmamode,
@@ -205,13 +230,13 @@ static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	static const struct ata_port_info info = {
 		.flags = ATA_FLAG_SLAVE_POSS,
-		.pio_mask = 0x1f,
-		.mwdma_mask = 0x07,
-		.udma_mask = 0x07,
+		.pio_mask = ATA_PIO4,
+		.mwdma_mask = ATA_MWDMA2,
+		.udma_mask = ATA_UDMA2,
 		.port_ops = &sc1200_port_ops
 	};
 	/* Can't enable port 2 yet, see top comments */
-	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
+	const struct ata_port_info *ppi[] = { &info, };
 
 	return ata_pci_sff_init_one(dev, ppi, &sc1200_sht, NULL);
 }