On 7/27/23 19:22, TW wrote:
> I managed to fix the patch file, guess the formatting messed up a bit. So will
> try with those patches installed.
Just in case, patch fil attached to avoid formatting issues.
--
Damien Le Moal
Western Digital Research
From 29e81d11812ee924d19425343ec69acd34af9d35 Mon Sep 17 00:00:00 2001
From: Damien Le Moal <dlemoal@xxxxxxxxxx>
Date: Mon, 24 Jul 2023 13:23:14 +0900
Subject: [PATCH] ata,scsi: do not issue START STOP UNIT on resume
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
---
drivers/ata/libata-scsi.c | 6 ++++++
drivers/scsi/sd.c | 5 +++--
include/scsi/scsi_device.h | 1 +
3 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 370d18aca71e..6184c7bcc16c 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1100,7 +1100,13 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
}
} else {
sdev->sector_size = ata_id_logical_sector_size(dev->id);
+ /*
+ * Stop the drive on suspend but do not issue START STOP UNIT
+ * on resume as this is not necessary: the port is reset on
+ * resume, which wakes up the drive.
+ */
sdev->manage_start_stop = 1;
+ sdev->no_start_on_resume = 1;
}
/*
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 68b12afa0721..b8584fe3123e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3876,7 +3876,7 @@ static int sd_suspend_runtime(struct device *dev)
static int sd_resume(struct device *dev)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
- int ret;
+ int ret = 0;
if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
return 0;
@@ -3885,7 +3885,8 @@ static int sd_resume(struct device *dev)
return 0;
sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
- ret = sd_start_stop_device(sdkp, 1);
+ if (!sdkp->device->no_start_on_resume)
+ ret = sd_start_stop_device(sdkp, 1);
if (!ret)
opal_unlock_from_suspend(sdkp->opal_dev);
return ret;
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 75b2235b99e2..b9230b6add04 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -194,6 +194,7 @@ struct scsi_device {
unsigned no_start_on_add:1; /* do not issue start on add */
unsigned allow_restart:1; /* issue START_UNIT in error handler */
unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
+ unsigned no_start_on_resume:1; /* Do not issue START_STOP_UNIT on resume */
unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
unsigned select_no_atn:1;
--
2.41.0
