This is a note to let you know that I've just added the patch titled
ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available.
to the 4.9-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:
arm-dts-omap5-dra7-indicate-that-sata-port-0-is-available.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 87cb12910a2ab6ed41ae951ea4d9c1cc1120199a Mon Sep 17 00:00:00 2001
From: Jean-Jacques Hiblot <jjhiblot@xxxxxx>
Date: Mon, 9 Jan 2017 13:22:15 +0100
Subject: ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available.
From: Jean-Jacques Hiblot <jjhiblot@xxxxxx>
commit 87cb12910a2ab6ed41ae951ea4d9c1cc1120199a upstream.
AHCI provides the register PORTS_IMPL to let the software know which port
is supported. The register must be initialized by the bootloader. However
in some cases u-boot doesn't properly initialize this value (if it is not
compiled with SATA support for example or if the SATA initialization fails).
The DTS entry "ports-implemented" can be used to override the value in
PORTS_IMPL.
Without this patch the SATA will not work in the following two cases:
* if there has been a failure to initialize SATA in u-boot.
* if ahci_platform module has been removed and re-inserted. The reason is
that the content of PORTS_IMPL is lost after the module is removed.
I suspect that it's because the controller is reset by the hwmod.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@xxxxxx>
Acked-by: Roger Quadros <rogerq@xxxxxx>
[tony@xxxxxxxxxxx: updated comments with what goes wrong]
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/boot/dts/dra7.dtsi | 1 +
arch/arm/boot/dts/omap5.dtsi | 1 +
2 files changed, 2 insertions(+)
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -1376,6 +1376,7 @@
phy-names = "sata-phy";
clocks = <&sata_ref_clk>;
ti,hwmods = "sata";
+ ports-implemented = <0x1>;
};
rtc: rtc@48838000 {
--- a/arch/arm/boot/dts/omap5.dtsi
+++ b/arch/arm/boot/dts/omap5.dtsi
@@ -985,6 +985,7 @@
phy-names = "sata-phy";
clocks = <&sata_ref_clk>;
ti,hwmods = "sata";
+ ports-implemented = <0x1>;
};
dss: dss@58000000 {
Patches currently in stable-queue which might be from jjhiblot@xxxxxx are
queue-4.9/arm-dts-omap5-dra7-indicate-that-sata-port-0-is-available.patch
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