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mtd: nand: brcmnand: Disable prefetch by default

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commit f953f0f89663c39f08f4baaa8a4a881401b65654 upstream.

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: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller")
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kamal Dasu 2018-01-08 15:36:48 -05:00 committed by Greg Kroah-Hartman
parent b4b3ad0c8c
commit eda72c8338
1 changed files with 3 additions and 10 deletions
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13
drivers/mtd/nand/brcmnand/brcmnand.c
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@ -1922,16 +1922,9 @@ static int brcmnand_setup_dev(struct brcmnand_host *host)
tmp &= ~ACC_CONTROL_PARTIAL_PAGE;
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))
tmp &= ~ACC_CONTROL_PREFETCH;
else
tmp |= ACC_CONTROL_PREFETCH;
}
if (ctrl->features & BRCMNAND_HAS_PREFETCH)
tmp &= ~ACC_CONTROL_PREFETCH;
nand_writereg(ctrl, offs, tmp);
return 0;