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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2016-04-01 09:52:57 +0200
committerTejun Heo <tj@kernel.org>2016-04-01 16:30:30 +0200
commit17dcc37e3e847bc0e67a5b1ec52471fcc6c18682 (patch)
treee5219e173278994cc4dc42e941237abafe16bf88 /drivers/ata/ahci_platform.c
parentlibahci: save port map for forced port map (diff)
downloadlinux-17dcc37e3e847bc0e67a5b1ec52471fcc6c18682.tar.xz
linux-17dcc37e3e847bc0e67a5b1ec52471fcc6c18682.zip
ata: ahci-platform: Add ports-implemented DT bindings.
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") Cc: stable@vger.kernel.org # v4.5+ 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>
Diffstat (limited to 'drivers/ata/ahci_platform.c')
-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 40442332bfa7..62a04c8fb5c9 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;