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openwrt-xburst/target/linux/ar71xx/patches-3.3/462-mtd-m25p80-set-spi-transfer-type.patch
juhosg 7bc411c5d9 ar71xx: boost SPI flash read performance
mtd_speedtest results:
                           page read speed
                    old         new        delta
DB120            929 KiB/s   2597 KiB/s   +179.55%
TL-WR1043ND v1   754 KiB/s   2166 KiB/s   +187.27%
TL-WR703N v1     745 KiB/s   2176 KiB/s   +192.08%
TL-MR3220 v1     752 KiB/s   2154 KiB/s   +186.44%
TL-WR2543ND v1   564 KiB/s   2130 KiB/s   +277.66%
TL-WR741ND v2    525 KiB/s   1767 KiB/s   +236.57%
ALFA-AP96        702 KiB/s   1977 KiB/s   +181.62%
WNDR3700         697 KiB/s   1965 KiB/s   +181.92%

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31118 3c298f89-4303-0410-b956-a3cf2f4a3e73
2012-03-27 19:38:17 +00:00

16 lines
505 B
Diff

--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -372,10 +372,12 @@ static int m25p80_read(struct mtd_info *
* OPCODE_FAST_READ (if available) is faster.
* Should add 1 byte DUMMY_BYTE.
*/
+ t[0].type = SPI_TRANSFER_FLASH_READ_CMD;
t[0].tx_buf = flash->command;
t[0].len = m25p_cmdsz(flash) + FAST_READ_DUMMY_BYTE;
spi_message_add_tail(&t[0], &m);
+ t[1].type = SPI_TRANSFER_FLASH_READ_DATA;
spi_message_add_tail(&t[1], &m);
/* Byte count starts at zero. */