documentation: update CodingStyle tips for Emacs users

[linux-2.6-omap-h63xx.git] / drivers / ide / ide-timings.c

diff --git a/drivers/ide/ide-timings.c b/drivers/ide/ide-timings.c
index ebef6d4e3f633bd9bb2ae512b42cf5530bd3b23f..8c2f8327f4872bba709ee503142866d0a102b214 100644 (file)
--- a/drivers/ide/ide-timings.c
+++ b/drivers/ide/ide-timings.c
@@ -1,5 +1,6 @@
 /*
  *  Copyright (c) 1999-2001 Vojtech Pavlik
+ *  Copyright (c) 2007-2008 Bartlomiej Zolnierkiewicz
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -75,6 +76,27 @@ struct ide_timing *ide_timing_find_mode(u8 speed)
 }
 EXPORT_SYMBOL_GPL(ide_timing_find_mode);
 
+u16 ide_pio_cycle_time(ide_drive_t *drive, u8 pio)
+{
+       struct hd_driveid *id = drive->id;
+       struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
+       u16 cycle = 0;
+
+       if (id->field_valid & 2) {
+               if (id->capability & 8)
+                       cycle = id->eide_pio_iordy;
+               else
+                       cycle = id->eide_pio;
+
+               /* conservative "downgrade" for all pre-ATA2 drives */
+               if (pio < 3 && cycle < t->cycle)
+                       cycle = 0; /* use standard timing */
+       }
+
+       return cycle ? cycle : t->cycle;
+}
+EXPORT_SYMBOL_GPL(ide_pio_cycle_time);
+
 #define ENOUGH(v, unit)                (((v) - 1) / (unit) + 1)
 #define EZ(v, unit)            ((v) ? ENOUGH(v, unit) : 0)