Patch "ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available." has been added to the 4.9-stable tree

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 <[email protected]> know about it.

From: Jean-Jacques Hiblot <[email protected]>
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 <[email protected]>

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.

---
 arch/arm/boot/dts/dra7.dtsi  |    1 +
 arch/arm/boot/dts/omap5.dtsi |    1 +
 2 files changed, 2 insertions(+)

@@ -1376,6 +1376,7 @@
 			phy-names = "sata-phy";
 			clocks = <&sata_ref_clk>;
 			ti,hwmods = "sata";
+			ports-implemented = <0x1>;
 		};
 
 		rtc: rtc@48838000 {

@@ -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 [email protected] are

queue-4.9/arm-dts-omap5-dra7-indicate-that-sata-port-0-is-available.patch