Patch "ata: ahci-platform: Add ports-implemented DT bindings." has been added to the 4.4-stable tree

Patch "ata: ahci-platform: Add ports-implemented DT bindings." has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ata: ahci-platform: Add ports-implemented DT bindings.

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ata-ahci-platform-add-ports-implemented-dt-bindings.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 17dcc37e3e847bc0e67a5b1ec52471fcc6c18682 Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Date: Fri, 1 Apr 2016 08:52:57 +0100
Subject: ata: ahci-platform: Add ports-implemented DT bindings.

From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

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>

---
 Documentation/devicetree/bindings/ata/ahci-platform.txt |    4 ++++
 drivers/ata/ahci_platform.c                             |    3 +++
 2 files changed, 7 insertions(+)

--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -30,6 +30,10 @@ Optional properties:
 - target-supply     : regulator for SATA target power
 - phys              : reference to the SATA PHY node
 - phy-names         : must be "sata-phy"
+- ports-implemented : Mask that indicates which ports that the HBA supports
+		      are available for software to use. Useful if PORTS_IMPL
+		      is not programmed by the BIOS, which is true with
+		      some embedded SOC's.
 
 Required properties when using sub-nodes:
 - #address-cells    : number of cells to encode an address
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -51,6 +51,9 @@ static int ahci_probe(struct platform_de
 	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;
 


Patches currently in stable-queue which might be from srinivas.kandagatla@linaro.org are

queue-4.4/libahci-save-port-map-for-forced-port-map.patch
queue-4.4/clk-qcom-msm8960-fix-ce3_src-register-offset.patch
queue-4.4/ata-ahci-platform-add-ports-implemented-dt-bindings.patch
queue-4.4/clk-qcom-msm8960-fix-ce3_core-clk-enable-register.patch