Commit f953f0f8 authored Jan 08, 2018 by Kamal Dasu Committed by Boris Brezillon Jan 09, 2018

mtd: nand: brcmnand: Disable prefetch by default



Brcm nand controller prefetch feature needs to be disabled
by default. Enabling affects performance on random reads as
well as dma reads.

Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Fixes: 27c5b17c ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller")
Cc: <stable@vger.kernel.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

parent 069f0534

drivers/mtd/nand/brcmnand/brcmnand.c

+3 −10

Original line number	Diff line number	Diff line
		@@ -2200,16 +2200,9 @@ static int brcmnand_setup_dev(struct brcmnand_host *host)
		if (ctrl->nand_version >= 0x0702)
		tmp \|= ACC_CONTROL_RD_ERASED;
		tmp &= ~ACC_CONTROL_FAST_PGM_RDIN;
		if (ctrl->features & BRCMNAND_HAS_PREFETCH) {
		/*
		* FIXME: Flash DMA + prefetch may see spurious erased-page ECC
		* errors
		*/
		if (has_flash_dma(ctrl))
		if (ctrl->features & BRCMNAND_HAS_PREFETCH)
		tmp &= ~ACC_CONTROL_PREFETCH;
		else
		tmp \|= ACC_CONTROL_PREFETCH;
		}

		nand_writereg(ctrl, offs, tmp);

		return 0;