linux-kernel - [PATCH 3/5] ieee1394: sbp2: fix spindown for PL-3507 and TSB42AA9 firmwares

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Date:	Sun, 11 May 2008 00:35:55 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net,
	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Tino Keitel <tino.keitel@....de>
Subject: [PATCH 3/5] ieee1394: sbp2: fix spindown for PL-3507 and TSB42AA9
 firmwares

Reported by Tino Keitel:  PL-3507 with firmware from Prolific does not
spin down the disk on START STOP UNIT with power condition = 0 and start
= 0.  It does however work with power condition = 2 or 3.

Also found while investigating this:  DViCO Momobay CX-1 and FX-3A (TI
TSB42AA9/A based) become unresponsive after START STOP UNIT with power
condition = 0 and start = 0.  They stay responsive if power condition is
set when stopping the motor.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
 drivers/ieee1394/sbp2.c |   20 ++++++++++++++++++--
 drivers/ieee1394/sbp2.h |    1 +
 2 files changed, 19 insertions(+), 2 deletions(-)

Index: linux/drivers/ieee1394/sbp2.c
===================================================================
--- linux.orig/drivers/ieee1394/sbp2.c
+++ linux/drivers/ieee1394/sbp2.c
@@ -186,6 +186,11 @@ MODULE_PARM_DESC(exclusive_login, "Exclu
  * - delay inquiry
  *   Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry.
  *
+ * - power condition
+ *   Set the power condition field in the START STOP UNIT commands sent by
+ *   sd_mod on suspend, resume, and shutdown (if manage_start_stop is on).
+ *   Some disks need this to spin down or to resume properly.
+ *
  * - override internal blacklist
  *   Instead of adding to the built-in blacklist, use only the workarounds
  *   specified in the module load parameter.
@@ -199,6 +204,8 @@ MODULE_PARM_DESC(workarounds, "Work arou
 	", skip mode page 8 = "   __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
 	", fix capacity = "       __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
 	", delay inquiry = "      __stringify(SBP2_WORKAROUND_DELAY_INQUIRY)
+	", set power condition in start stop unit = "
+				  __stringify(SBP2_WORKAROUND_POWER_CONDITION)
 	", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
 	", or a combination)");
 
@@ -359,18 +366,25 @@ static const struct {
 		.firmware_revision	= 0x002800,
 		.model_id		= 0x001010,
 		.workarounds		= SBP2_WORKAROUND_INQUIRY_36 |
-					  SBP2_WORKAROUND_MODE_SENSE_8,
+					  SBP2_WORKAROUND_MODE_SENSE_8 |
+					  SBP2_WORKAROUND_POWER_CONDITION,
 	},
 	/* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
 		.firmware_revision	= 0x002800,
 		.model_id		= 0x000000,
-		.workarounds		= SBP2_WORKAROUND_DELAY_INQUIRY,
+		.workarounds		= SBP2_WORKAROUND_DELAY_INQUIRY |
+					  SBP2_WORKAROUND_POWER_CONDITION,
 	},
 	/* Initio bridges, actually only needed for some older ones */ {
 		.firmware_revision	= 0x000200,
 		.model_id		= SBP2_ROM_VALUE_WILDCARD,
 		.workarounds		= SBP2_WORKAROUND_INQUIRY_36,
 	},
+	/* PL-3507 bridge with Prolific firmware */ {
+		.firmware_revision	= 0x012800,
+		.model_id		= SBP2_ROM_VALUE_WILDCARD,
+		.workarounds		= SBP2_WORKAROUND_POWER_CONDITION,
+	},
 	/* Symbios bridge */ {
 		.firmware_revision	= 0xa0b800,
 		.model_id		= SBP2_ROM_VALUE_WILDCARD,
@@ -2002,6 +2016,8 @@ static int sbp2scsi_slave_configure(stru
 		sdev->skip_ms_page_8 = 1;
 	if (lu->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
 		sdev->fix_capacity = 1;
+	if (lu->workarounds & SBP2_WORKAROUND_POWER_CONDITION)
+		sdev->start_stop_pwr_cond = 1;
 	if (lu->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
 		blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
 	return 0;
Index: linux/drivers/ieee1394/sbp2.h
===================================================================
--- linux.orig/drivers/ieee1394/sbp2.h
+++ linux/drivers/ieee1394/sbp2.h
@@ -345,6 +345,7 @@ enum sbp2lu_state_types {
 #define SBP2_WORKAROUND_FIX_CAPACITY	0x8
 #define SBP2_WORKAROUND_DELAY_INQUIRY	0x10
 #define SBP2_INQUIRY_DELAY		12
+#define SBP2_WORKAROUND_POWER_CONDITION	0x20
 #define SBP2_WORKAROUND_OVERRIDE	0x100
 
 #endif /* SBP2_H */

-- 
Stefan Richter
-=====-==--- -=-= -=-==
http://arcgraph.de/sr/

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