linux-kernel - [PATCH 4.9 067/130] ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available.

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Date:   Tue, 24 Jan 2017 08:55:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jean-Jacques Hiblot <jjhiblot@...com>,
        Roger Quadros <rogerq@...com>, Tony Lindgren <tony@...mide.com>
Subject: [PATCH 4.9 067/130] ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available.

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jean-Jacques Hiblot <jjhiblot@...com>

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@...com>
Acked-by: Roger Quadros <rogerq@...com>
[tony@...mide.com: updated comments with what goes wrong]
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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@...38000 {
--- 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@...00000 {