libata: add @is_cmd to ata_tf_to_fis()

Add @is_cmd to ata_tf_to_fis().  This controls bit 7 of the second
byte which tells the device whether this H2D FIS is for a command or
not.  This cleans up ahci a bit and will be used by PMP.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index e2ecb7a4628..39a8e986a4e 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -111,8 +111,9 @@ MODULE_VERSION(DRV_VERSION);
 /**
  *      ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
  *      @tf: Taskfile to convert
- *      @fis: Buffer into which data will output
  *      @pmp: Port multiplier port
+ *      @is_cmd: This FIS is for command
+ *      @fis: Buffer into which data will output
  *
  *      Converts a standard ATA taskfile to a Serial ATA
  *      FIS structure (Register - Host to Device).
@@ -120,12 +121,13 @@ MODULE_VERSION(DRV_VERSION);
  *      LOCKING:
  *      Inherited from caller.
  */
-
-void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
+void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
 {
-        fis[0] = 0x27;  /* Register - Host to Device FIS */
-        fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
-                                            bit 7 indicates Command FIS */
+        fis[0] = 0x27;                  /* Register - Host to Device FIS */
+        fis[1] = pmp & 0xf;             /* Port multiplier number*/
+        if (is_cmd)
+                fis[1] |= (1 << 7);     /* bit 7 indicates Command FIS */
+
         fis[2] = tf->command;
         fis[3] = tf->feature;