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ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available.

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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.

Cc: <stable@vger.kernel.org> # v4.6+
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Acked-by: Roger Quadros <rogerq@ti.com>
[tony@atomide.com: updated comments with what goes wrong]
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Jean-Jacques Hiblot 2017-01-09 13:22:15 +01:00 committed by Tony Lindgren
parent 8e2329ead7
commit 87cb12910a
2 changed files with 2 additions and 0 deletions
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1
arch/arm/boot/dts/dra7.dtsi
View file

@ -1378,6 +1378,7 @@ sata: sata@4a141100 {
phy-names = "sata-phy"; phy-names = "sata-phy";
clocks = <&sata_ref_clk>; clocks = <&sata_ref_clk>;
ti,hwmods = "sata"; ti,hwmods = "sata";
ports-implemented = <0x1>;
}; };
rtc: rtc@48838000 { rtc: rtc@48838000 {

1
arch/arm/boot/dts/omap5.dtsi
View file

@ -988,6 +988,7 @@ sata: sata@4a141100 {
phy-names = "sata-phy"; phy-names = "sata-phy";
clocks = <&sata_ref_clk>; clocks = <&sata_ref_clk>;
ti,hwmods = "sata"; ti,hwmods = "sata";
ports-implemented = <0x1>;
}; };
dss: dss@58000000 { dss: dss@58000000 {