diff options
| author | Ronald Hoogenboom <hoogenboom30@zonnet.nl> | 2008-01-21 23:55:08 +0000 |
|---|---|---|
| committer | Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> | 2008-01-21 23:55:08 +0000 |
| commit | 21efd9ffe2bc51463bd4278def63e3c294907da2 (patch) | |
| tree | f2ff7373c67075ec0375ce942959ba33f9bc0be6 /util/flashrom/spi.c | |
| parent | 679c62c083d4e4edbc292160d441dbfe6ae3cd40 (diff) | |
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.
Signed-off-by: Ronald Hoogenboom <hoogenboom30@zonnet.nl>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3068 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'util/flashrom/spi.c')
| -rw-r--r-- | util/flashrom/spi.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/util/flashrom/spi.c b/util/flashrom/spi.c index 20e8828697..4c01b3104f 100644 --- a/util/flashrom/spi.c +++ b/util/flashrom/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; |