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* [RFC PATCH] drivers: ata: ahci_sunxi: Increased SATA/AHCI DMA TX/RX FIFOs
@ 2019-05-10 19:25 Uenal Mutlu
       [not found] ` <>
  2019-05-12 12:12 ` Maxime Ripard
  0 siblings, 2 replies; 5+ messages in thread
From: Uenal Mutlu @ 2019-05-10 19:25 UTC (permalink / raw)
  To: Jens Axboe, Maxime Ripard, Chen-Yu Tsai, linux-ide,
	linux-arm-kernel, linux-kernel
  Cc: Uenal Mutlu, linux-sunxi, u-boot, linux-amarula, Jagan Teki,
	Pablo Greco, Mark Rutland, Oliver Schinagl, Linus Walleij,
	Hans de Goede, FUKAUMI Naoki, Andre Przywara

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

Signed-off-by: Uenal Mutlu <>
 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);

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2019-05-12 17:40 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2019-05-10 19:25 [RFC PATCH] drivers: ata: ahci_sunxi: Increased SATA/AHCI DMA TX/RX FIFOs Uenal Mutlu
     [not found] ` <>
2019-05-11 18:12   ` U.Mutlu
2019-05-12 12:12 ` Maxime Ripard
2019-05-12 16:08   ` U.Mutlu
2019-05-12 17:40     ` Maxime Ripard

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