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Omitting the wait for SPI ready when there is no data to be read, e.g

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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 <hoogenboom30@zonnet.nl>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
This commit is contained in:
Ronald Hoogenboom 2008-01-21 23:55:08 +00:00 committed by Carl-Daniel Hailfinger
parent 201bde33d0
commit d4554c5d73
1 changed files with 8 additions and 5 deletions
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3
spi.c
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@ -227,6 +227,8 @@ 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. * 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); outb(((0x4 + (fast_spi ? 1 : 0)) << 4) | ((readcnt & 0x3) << 2) | (writeenc), port);
if (readcnt > 0) {
do { do {
busy = inb(port) & 0x80; busy = inb(port) & 0x80;
} while (busy); } while (busy);
@ -234,6 +236,7 @@ static int it8716f_spi_command(uint16_t port, unsigned int writecnt, unsigned in
for (i = 0; i < readcnt; i++) { for (i = 0; i < readcnt; i++) {
readarr[i] = inb(port + 5 + i); readarr[i] = inb(port + 5 + i);
} }
}
return 0; return 0;
} }