[PATCH v3] ata: pci: enable bus mastering

[Christian Gmeiner]

The non DM code path already would enable pci bus mastering. Do the
same for the DM code path.

Fixes AHCI problems I am seeing on an Intel Apollolake device.

Signed-off-by: Christian Gmeiner <christian.gmeiner at gmail.com>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
---

v2: Add Bin's R-b and remove the ending '.' from comment.
v3: Add the patch changelog to the correct place

 drivers/ata/ahci.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 6998b82aa5..360ac2c060 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1152,7 +1152,12 @@ int ahci_probe_scsi(struct udevice *ahci_dev, ulong base)
 int ahci_probe_scsi_pci(struct udevice *ahci_dev)
 {
 	ulong base;
-	u16 vendor, device;
+	u16 vendor, device, cmd;
+
+	/* Enable bus mastering */
+	dm_pci_read_config16(dev, PCI_COMMAND, &cmd);
+	cmd |= PCI_COMMAND_MASTER;
+	dm_pci_write_config16(dev, PCI_COMMAND, cmd);
 
 	base = (ulong)dm_pci_map_bar(ahci_dev, PCI_BASE_ADDRESS_5, 0, 0,
 				     PCI_REGION_TYPE, PCI_REGION_MEM);
-- 
2.40.0