From: Jean-Jacques Hiblot Date: Mon, 9 Jan 2017 12:22:15 +0000 (+0100) Subject: ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available. X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5b66186152158076de6a1405329b255a327dd538;p=linux-beck.git ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available. 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 Acked-by: Roger Quadros [tony@atomide.com: updated comments with what goes wrong] Signed-off-by: Tony Lindgren Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi index d4fcd68f6349..ef888295aa7b 100644 --- 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 { diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi index 25262118ec3d..f8aa0cbc5f01 100644 --- 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 {