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ARM: dts: am437xx: Enable NAND dma prefetch by default

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Currently the default method of prefetch polled shows the highest
possible read and write speed when minimal non NAND background
activity is being done. But it is also very CPU intensive to reach
these high speeds (CPU load of 99% via mtd performance tests). While
DMA prefetch only uses 50% of the CPU to achieve around 23% less in
top read and write performance.

However, as the non NAND CPU load increases the read and write
performance takes a large hit when using polled prefetch. Therefore,
prefetch dma mode ends up outperforming prefetch polled in general
"system level" test. So switch to using dma prefetch by default since
it is likely what most users would prefer.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Franklin S Cooper Jr 2017-07-25 21:15:51 -05:00 committed by Tony Lindgren
parent 7d8fec2091
commit 78b02c36e4
2 changed files with 2 additions and 0 deletions
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1
arch/arm/boot/dts/am437x-gp-evm.dts
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@ -856,6 +856,7 @@
interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
<1 IRQ_TYPE_NONE>; /* termcount */
rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
ti,nand-xfer-type = "prefetch-dma";
ti,nand-ecc-opt = "bch16";
ti,elm-id = <&elm>;
nand-bus-width = <8>;

1
arch/arm/boot/dts/am43x-epos-evm.dts
View File

@ -564,6 +564,7 @@
interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
<1 IRQ_TYPE_NONE>; /* termcount */
rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
ti,nand-xfer-type = "prefetch-dma";
ti,nand-ecc-opt = "bch16";
ti,elm-id = <&elm>;
nand-bus-width = <8>;