sata_rcar: correct 'sata_rcar_sht'

Using ATA_BMDMA_SHT() to intialize 'sata_rcar_sht' was suboptimal as
the R-Car descriptor table transfer counter is 28 bits wide (bit 1 to
bit 28), so that the 'dma_boundary' field of 0xFFFF is just too small,
as well as the 'sg_tablesize' field of 128.  Use ATA_BASE_SHT() to
initialize 'sata_rcar_sht' instead and give proper values to the
'dma_boundary' and 'sg_tablesize' fields explicitly.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
index 629b07c452c5..178165be0c32 100644
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -121,6 +121,8 @@
 /* Descriptor table word 0 bit (when DTA32M = 1) */
 #define SATA_RCAR_DTEND                 BIT(0)
 
+#define SATA_RCAR_DMA_BOUNDARY          0x1FFFFFFEUL
+
 struct sata_rcar_priv {
         void __iomem *base;
         struct clk *clk;
@@ -575,7 +577,14 @@ static u8 sata_rcar_bmdma_status(struct ata_port *ap)
 }
 
 static struct scsi_host_template sata_rcar_sht = {
-        ATA_BMDMA_SHT(DRV_NAME),
+        ATA_BASE_SHT(DRV_NAME),
+        /*
+         * This controller allows transfer chunks up to 512MB which cross 64KB
+         * boundaries, therefore the DMA limits are more relaxed than standard
+         * ATA SFF.
+         */
+        .sg_tablesize           = ATA_MAX_PRD,
+        .dma_boundary           = SATA_RCAR_DMA_BOUNDARY,
 };
 
 static struct ata_port_operations sata_rcar_port_ops = {