[PATCH] idle ide disk on resume

[Jens Axboe <axboe@suse.de>]

Hi,

I need this patch to survive suspend on my powerbook, if the drive is
sleeping when suspend is entered. Otherwise it freezes on resume when it
tries to read from the drive.

===== drivers/ide/ide-disk.c 1.86 vs edited =====
--- 1.86/drivers/ide/ide-disk.c	2004-06-05 22:15:29 +02:00
+++ edited/drivers/ide/ide-disk.c	2004-06-22 14:15:08 +02:00
@@ -1334,7 +1334,8 @@
 	idedisk_pm_flush_cache	= ide_pm_state_start_suspend,
 	idedisk_pm_standby,
 
-	idedisk_pm_restore_dma	= ide_pm_state_start_resume,
+	idedisk_pm_idle		= ide_pm_state_start_resume,
+	idedisk_pm_restore_dma,
 };
 
 static void idedisk_complete_power_step (ide_drive_t *drive, struct request *rq, u8 stat, u8 error)
@@ -1349,6 +1350,9 @@
 	case idedisk_pm_standby:	/* Suspend step 2 (standby) complete */
 		rq->pm->pm_step = ide_pm_state_completed;
 		break;
+	case idedisk_pm_idle:		/* resume step 1, idle drive */
+		rq->pm->pm_step = idedisk_pm_restore_dma;
+		break;
 	}
 }
 
@@ -1376,6 +1380,12 @@
 		args->tfRegister[IDE_COMMAND_OFFSET] = WIN_STANDBYNOW1;
 		args->command_type = IDE_DRIVE_TASK_NO_DATA;
 		args->handler	   = &task_no_data_intr;
+		return do_rw_taskfile(drive, args);
+
+	case idedisk_pm_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 idedisk_pm_restore_dma:	/* Resume step 1 (restore DMA) */

-- 
Jens Axboe