openwrt/target/linux/ar71xx/patches-3.3/203-spi-ath79-remove-superfluous-chip-select-code.patch
Gabor Juhos 102c6df148 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%

SVN-Revision: 31117
2012-03-27 19:38:15 +00:00

31 lines
918 B
Diff

From ecf57a64feb737dec1da72aab21dccd30a88ba19 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Mon, 9 Jan 2012 15:03:28 +0100
Subject: [PATCH 3/7] spi/ath79: remove superfluous chip select code
The spi_bitbang driver calls the chipselect function
of the driver from spi_bitbang_setup in order to
deselect the given SPI chip, so we don't have to
initialize the CS line here.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
drivers/spi/spi-ath79.c | 6 ------
1 files changed, 0 insertions(+), 6 deletions(-)
--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -128,12 +128,6 @@ static int ath79_spi_setup_cs(struct spi
gpio_free(cdata->gpio);
return status;
}
- } else {
- if (spi->mode & SPI_CS_HIGH)
- sp->ioc_base |= AR71XX_SPI_IOC_CS0;
- else
- sp->ioc_base &= ~AR71XX_SPI_IOC_CS0;
- ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
}
return 0;