Author: hailfinger
Date: 2008-01-22 00:55:08 +0100 (Tue, 22 Jan 2008)
New Revision: 3068
Modified:
trunk/util/flashrom/spi.c
Log:
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 <[EMAIL PROTECTED]>
Acked-by: Carl-Daniel Hailfinger <[EMAIL PROTECTED]>
Modified: trunk/util/flashrom/spi.c
===================================================================
--- trunk/util/flashrom/spi.c 2008-01-21 15:24:22 UTC (rev 3067)
+++ trunk/util/flashrom/spi.c 2008-01-21 23:55:08 UTC (rev 3068)
@@ -227,12 +227,15 @@
* 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;
--
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