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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2016-04-01 08:52:57 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-05-11 11:21:21 +0200
commit6e337a05df8adfc54540ca2a2b9d621836697796 (patch)
tree2081ead2e6f7303043c62d77fdb7f82d8fa98ab7 /drivers/ata
parenta7fa0a478a625039ef0852e5606d1248cba093e4 (diff)
ata: ahci-platform: Add ports-implemented DT bindings.
commit 17dcc37e3e847bc0e67a5b1ec52471fcc6c18682 upstream. On some SOCs PORTS_IMPL register value is never programmed by the firmware and left at zero value. Which means that no sata ports are available for software. AHCI driver used to cope up with this by fabricating the port_map if the PORTS_IMPL register is read zero, but recent patch broke this workaround as zero value was valid for NVMe disks. This patch adds ports-implemented DT bindings as workaround for this issue in a way that DT can can override the PORTS_IMPL register in cases where the firmware did not program it already. Fixes: 566d1827df2e ("libata: disable forced PORTS_IMPL for >= AHCI 1.3") Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Acked-by: Tejun Heo <tj@kernel.org> Reviewed-by: Andy Gross <andy.gross@linaro.org> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/ahci_platform.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 04975b851c23..639adb1f8abd 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -51,6 +51,9 @@ static int ahci_probe(struct platform_device *pdev)
if (rc)
return rc;
+ of_property_read_u32(dev->of_node,
+ "ports-implemented", &hpriv->force_port_map);
+
if (of_device_is_compatible(dev->of_node, "hisilicon,hisi-ahci"))
hpriv->flags |= AHCI_HFLAG_NO_FBS | AHCI_HFLAG_NO_NCQ;