From d4554c5d73a4f54b441905f01997c4177bbbfd0d Mon Sep 17 00:00:00 2001 From: Ronald Hoogenboom Date: Mon, 21 Jan 2008 23:55:08 +0000 Subject: Omitting the wait for SPI ready when there is no data to be read, e.g readcnt==0 saves 10 seconds with the unconditional 10us delay, reducing programming time for SST25VF016B to 40-45 secs. Corresponding to flashrom svn r183 and coreboot v2 svn r3068. Signed-off-by: Ronald Hoogenboom Acked-by: Carl-Daniel Hailfinger --- spi.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'spi.c') diff --git a/spi.c b/spi.c index 20e8828..4c01b31 100644 --- a/spi.c +++ b/spi.c @@ -227,12 +227,15 @@ static int it8716f_spi_command(uint16_t port, unsigned int writecnt, unsigned in * We can't use writecnt directly, but have to use a strange encoding. */ outb(((0x4 + (fast_spi ? 1 : 0)) << 4) | ((readcnt & 0x3) << 2) | (writeenc), port); - do { - busy = inb(port) & 0x80; - } while (busy); - for (i = 0; i < readcnt; i++) { - readarr[i] = inb(port + 5 + i); + if (readcnt > 0) { + do { + busy = inb(port) & 0x80; + } while (busy); + + for (i = 0; i < readcnt; i++) { + readarr[i] = inb(port + 5 + i); + } } return 0; -- cgit v1.1