Increasing the SATA/AHCI DMA TX/RX FIFOs (P0DMACR.TXTS and .RXTS) from default 0x0 each to 0x3 each gives a write performance boost of 120MB/s from lame 36MB/s to 45MB/s previously. Read performance is about 200MB/s [tested on SSD using dd bs=4K count=512K]. Tested on the Banana Pi R1 (aka Lamobo R1) and Banana Pi M1 SBCs with Allwinner A20 32bit-SoCs (ARMv7-a / arm-linux-gnueabihf). These devices are RaspberryPi-like small devices. RFC: Since more than about 25 similar SBC/SoC models do use the ahci_sunxi driver, users are encouraged to test it on all the affected boards and give feedback. List of the affected sunxi and other boards and SoCs with SATA using the ahci_sunxi driver: $ grep -i -e "^&ahci" arch/arm/boot/dts/sun*dts and http://linux-sunxi.org/Category:Devices_with_SATA_port Signed-off-by: Uenal Mutlu <um@xxxxxxxxxxx> --- drivers/ata/ahci_sunxi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ata/ahci_sunxi.c b/drivers/ata/ahci_sunxi.c index 911710643305..257986431c79 100644 --- a/drivers/ata/ahci_sunxi.c +++ b/drivers/ata/ahci_sunxi.c @@ -158,7 +158,7 @@ static void ahci_sunxi_start_engine(struct ata_port *ap) struct ahci_host_priv *hpriv = ap->host->private_data; /* Setup DMA before DMA start */ - sunxi_clrsetbits(hpriv->mmio + AHCI_P0DMACR, 0x0000ff00, 0x00004400); + sunxi_clrsetbits(hpriv->mmio + AHCI_P0DMACR, 0x0000ffff, 0x00004433); /* Start DMA */ sunxi_setbits(port_mmio + PORT_CMD, PORT_CMD_START); -- 2.11.0
