In some cases, system bus can be configured for 16-bit mode, in this
case using of read/write functions for the 32 bit values causes two
cycles of 16 bits, which is incorrect.
The patch provides its own function to use the proper 16-bit mode.
Signed-off-by: Alexander Shiyan <shc_work@xxxxxxx>
---
drivers/ata/pata_platform.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
index ecbc3bf..79dd223 100644
--- a/drivers/ata/pata_platform.c
+++ b/drivers/ata/pata_platform.c
@@ -43,13 +43,28 @@ static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unu
return 0;
}
+static unsigned int pata_platform_xfer_noirq(struct ata_device *dev,
+ unsigned char *buf,
+ unsigned int buflen, int rw)
+{
+ unsigned long flags;
+ unsigned int consumed;
+
+ local_irq_save(flags);
+ /* Use 16-bit transfer */
+ consumed = ata_sff_data_xfer(dev, buf, buflen, rw);
+ local_irq_restore(flags);
+
+ return consumed;
+}
+
static struct scsi_host_template pata_platform_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations pata_platform_port_ops = {
.inherits = &ata_sff_port_ops,
- .sff_data_xfer = ata_sff_data_xfer_noirq,
+ .sff_data_xfer = pata_platform_xfer_noirq,
.cable_detect = ata_cable_unknown,
.set_mode = pata_platform_set_mode,
};
--
1.8.5.5
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