4.14-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 4ab7ca092c3c7ac8b16aa28eba723a8868f82f14 ]
The SAMA5D2 is different from SAMA5D3 and SAMA5D4, as there are two different clocks for the peripherals in the SoC. The Static Memory controller is connected to the divided master clock.
Unfortunately, the device tree does not correctly show this and uses the master clock directly. This clock is then used by the code for the NAND controller to calculate the timings for the controller, and we end up with slow NAND Flash access.
Fix the device tree, and the performance of Flash access is improved.
Signed-off-by: Romain Izard romain.izard.pro@gmail.com Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm/boot/dts/sama5d2.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/sama5d2.dtsi b/arch/arm/boot/dts/sama5d2.dtsi index b1a26b42d190..a8e4b89097d9 100644 --- a/arch/arm/boot/dts/sama5d2.dtsi +++ b/arch/arm/boot/dts/sama5d2.dtsi @@ -308,7 +308,7 @@ 0x1 0x0 0x60000000 0x10000000 0x2 0x0 0x70000000 0x10000000 0x3 0x0 0x80000000 0x10000000>; - clocks = <&mck>; + clocks = <&h32ck>; status = "disabled";
nand_controller: nand-controller {