source: trunk/target/linux/ar71xx/patches-3.3/202-spi-ath79-add-missing-HIGH-LOW-SCK-transition.patch @ 31117

Last change on this file since 31117 was 31117, checked in by juhosg, 4 years ago

ar71xx: improve SPI flash read/write performance

mtd_speedtest results:

page write speed

old new delta

DB120 209 KiB/s 226 KiB/s +8.13%
TL-WR1043ND v1 122 KiB/s 148 KiB/s +21.31%
TL-WR703N v1 153 KiB/s 194 KiB/s +26.80%
TL-MR3220 v1 130 KiB/s 156 KiB/s +20.00%
TL-WR2543ND v1 158 KiB/s 202 KiB/s +27.85%
TL-WR741ND v2 122 KiB/s 152 KiB/s +24.59%
ALFA AP96 229 KiB/s 260 KiB/s +13.54%
WNDR3700 202 KiB/s 223 KiB/s +10.40%

page read speed

old new delta

DB120 691 KiB/s 929 KiB/s +34.44%
TL-WR1043ND v1 372 KiB/s 754 KiB/s +102.69%
TL-WR703N v1 375 KiB/s 745 KiB/s +98.67%
TL-MR3220 v1 372 KiB/s 752 KiB/s +102.15%
TL-WR2543ND v1 307 KiB/s 564 KiB/s +83.71%
TL-WR741ND v2 315 KiB/s 525 KiB/s +66.67%
ALFA AP96 515 KiB/s 702 KiB/s +36.31%
WNDR3700 515 KiB/s 697 KiB/s +35.34%

File size: 692 bytes
  • drivers/spi/spi-ath79.c

    From ea7e40aedae58b7a0f0ccd8658063de499734874 Mon Sep 17 00:00:00 2001
    From: Gabor Juhos <juhosg@openwrt.org>
    Date: Wed, 11 Jan 2012 20:33:41 +0100
    Subject: [PATCH 2/7] spi/ath79: add missing HIGH->LOW SCK transition
    
    Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
    ---
     drivers/spi/spi-ath79.c |    2 ++
     1 files changed, 2 insertions(+), 0 deletions(-)
    
    a b static u32 ath79_spi_txrx_mode0(struct s 
    200200                ath79_spi_delay(sp, nsecs); 
    201201                ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK); 
    202202                ath79_spi_delay(sp, nsecs); 
     203                if (bits == 1) 
     204                        ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out); 
    203205 
    204206                word <<= 1; 
    205207        } 
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