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authorJason Lunz <lunz@falooley.org>2006-10-03 01:14:26 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-03 08:04:08 -0700
commit8c2c0118b86183bf4826db990cae5c8a8d6c6746 (patch)
tree71f7e806eccec4ef2d41fc6490395cc01bcb8123
parent3f63c5e88a5ce45b423f3712293f1664115b09c0 (diff)
[PATCH] ide: reprogram disk pio timings on resume
Add a step to the IDE PM state machine that reprograms disk PIO timings as the first step on resume. This prevents ide deadlock on resume-from-ram on my nforce3-based laptop. An earlier implementation was written entirely within the amd74xx ide driver, but Alan helpfully pointed out that this is the correct thing to do globally. Still, I'm only calling hwif->tuneproc() for disks, based on two things: - The existing state machine is already passed over for non-disk drives - Previous testing on my laptop shows that the hangs are related only to the disk - suspend/resume from a livecd showed that there's no need for this on the cdrom. Signed-off-by: Jason Lunz <lunz@falooley.org> Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Brad Campbell <brad@wasp.net.au> Cc: David Brownell <david-b@pacbell.net> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/ide/ide-io.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 8d26619ba16..ba6039b55b4 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -134,7 +134,8 @@ enum {
ide_pm_flush_cache = ide_pm_state_start_suspend,
idedisk_pm_standby,
- idedisk_pm_idle = ide_pm_state_start_resume,
+ idedisk_pm_restore_pio = ide_pm_state_start_resume,
+ idedisk_pm_idle,
ide_pm_restore_dma,
};
@@ -155,7 +156,10 @@ static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 s
case idedisk_pm_standby: /* Suspend step 2 (standby) complete */
pm->pm_step = ide_pm_state_completed;
break;
- case idedisk_pm_idle: /* Resume step 1 (idle) complete */
+ case idedisk_pm_restore_pio: /* Resume step 1 complete */
+ pm->pm_step = idedisk_pm_idle;
+ break;
+ case idedisk_pm_idle: /* Resume step 2 (idle) complete */
pm->pm_step = ide_pm_restore_dma;
break;
}
@@ -169,8 +173,11 @@ static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *
memset(args, 0, sizeof(*args));
if (drive->media != ide_disk) {
- /* skip idedisk_pm_idle for ATAPI devices */
- if (pm->pm_step == idedisk_pm_idle)
+ /*
+ * skip idedisk_pm_restore_pio and idedisk_pm_idle for ATAPI
+ * devices
+ */
+ if (pm->pm_step == idedisk_pm_restore_pio)
pm->pm_step = ide_pm_restore_dma;
}
@@ -197,13 +204,19 @@ static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *
args->handler = &task_no_data_intr;
return do_rw_taskfile(drive, args);
- case idedisk_pm_idle: /* Resume step 1 (idle) */
+ case idedisk_pm_restore_pio: /* Resume step 1 (restore PIO) */
+ if (drive->hwif->tuneproc != NULL)
+ drive->hwif->tuneproc(drive, 255);
+ ide_complete_power_step(drive, rq, 0, 0);
+ return ide_stopped;
+
+ case idedisk_pm_idle: /* Resume step 2 (idle) */
args->tfRegister[IDE_COMMAND_OFFSET] = WIN_IDLEIMMEDIATE;
args->command_type = IDE_DRIVE_TASK_NO_DATA;
args->handler = task_no_data_intr;
return do_rw_taskfile(drive, args);
- case ide_pm_restore_dma: /* Resume step 2 (restore DMA) */
+ case ide_pm_restore_dma: /* Resume step 3 (restore DMA) */
/*
* Right now, all we do is call hwif->ide_dma_check(drive),
* we could be smarter and check for current xfer_speed