[libata] sata_sx4: fixup interrupt handling

Issuing ATA_CMD_SET_FEATURES (0xef) times out because
pdc20621_interrupt ignores command completion since
ATA_TFLAG_POLLING flag is set.

This has already been fixed for sata_promise:

commit 51b94d2a5a90d4800e74d7348bcde098a28f4fb3
Author: Tejun Heo <htejun@gmail.com>
Date:   Fri Jun 8 13:46:55 2007 -0700

    sata_promise: use TF interface for polling NODATA commands

Also, this patch includes Mikael's original patches:

http://marc.info/?l=linux-ide&m=121135828227724&w=2
http://marc.info/?l=linux-ide&m=121144512109826&w=2

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: David Milburn <dmilburn@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 9 insertions, 13 deletions

diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c
index 1ce98afa69b6..eb05a3c82a9e 100644
--- a/drivers/ata/sata_sx4.c
+++ b/drivers/ata/sata_sx4.c
@@ -687,8 +687,11 @@ static void pdc20621_packet_start(struct ata_queued_cmd *qc)
 static unsigned int pdc20621_qc_issue(struct ata_queued_cmd *qc)
 {
         switch (qc->tf.protocol) {
-        case ATA_PROT_DMA:
         case ATA_PROT_NODATA:
+                if (qc->tf.flags & ATA_TFLAG_POLLING)
+                        break;
+                /*FALLTHROUGH*/
+        case ATA_PROT_DMA:
                 pdc20621_packet_start(qc);
                 return 0;
 
@@ -787,12 +790,7 @@ static inline unsigned int pdc20621_host_intr(struct ata_port *ap,
 
 static void pdc20621_irq_clear(struct ata_port *ap)
 {
-        struct ata_host *host = ap->host;
-        void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
-
-        mmio += PDC_CHIP0_OFS;
-
-        readl(mmio + PDC_20621_SEQMASK);
+        ioread8(ap->ioaddr.status_addr);
 }
 
 static irqreturn_t pdc20621_interrupt(int irq, void *dev_instance)
@@ -877,14 +875,12 @@ static void pdc_freeze(struct ata_port *ap)
 static void pdc_thaw(struct ata_port *ap)
 {
         void __iomem *mmio = ap->ioaddr.cmd_addr;
-        void __iomem *mmio_base;
         u32 tmp;
 
         /* FIXME: start HDMA engine, if zero ATA engines running */
 
-        /* reading SEQ mask register clears IRQ */
-        mmio_base = ap->host->iomap[PDC_MMIO_BAR] + PDC_CHIP0_OFS;
-        readl(mmio_base + PDC_20621_SEQMASK);
+        /* clear IRQ */
+        ioread8(ap->ioaddr.status_addr);
 
         /* turn IRQ back on */
         tmp = readl(mmio + PDC_CTLSTAT);
@@ -974,7 +970,7 @@ static int pdc_check_atapi_dma(struct ata_queued_cmd *qc)
 static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
 {
         WARN_ON(tf->protocol == ATA_PROT_DMA ||
-                tf->protocol == ATA_PROT_NODATA);
+                tf->protocol == ATAPI_PROT_DMA);
         ata_sff_tf_load(ap, tf);
 }
 
@@ -982,7 +978,7 @@ static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
 static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
 {
         WARN_ON(tf->protocol == ATA_PROT_DMA ||
-                tf->protocol == ATA_PROT_NODATA);
+                tf->protocol == ATAPI_PROT_DMA);
         ata_sff_exec_command(ap, tf);
 }