[PATCH v3 0/3] drivers: ide: use generic power management

[PATCH v3 0/3] drivers: ide: use generic power management

[Vaibhav Gupta]

Linux Kernel Mentee: Remove Legacy Power Management.

The purpose of this patch series is to remove legacy power management callbacks
from ide drivers.

The suspend() and resume() callbacks operations are still invoking
pci_save/restore_state(), pci_set_power_state(), pci_enable/disable_state(),
etc. and handling the power management themselves, which is not recommended.

The conversion requires the removal of the those function calls and change the
callback definition accordingly and make use of dev_pm_ops structure.

All patches are compile-tested only.

v3:
    - Modpost error for undefined reference by Kbuild in v1.
    - Another approach to disable PM in drivers/ide/triflex.c suggested by
      Bjorn Helgaas in v2.

Test tools:
    - Compiler: gcc (GCC) 10.1.0
    - allmodconfig build: make -j$(nproc) W=1 all

Vaibhav Gupta (3):
  ide: use generic power management
  ide: sc1200: use generic power management
  ide: delkin_cb: use generic power management

 drivers/ide/aec62xx.c         |  3 +--
 drivers/ide/alim15x3.c        |  3 +--
 drivers/ide/amd74xx.c         |  3 +--
 drivers/ide/atiixp.c          |  3 +--
 drivers/ide/cmd64x.c          |  3 +--
 drivers/ide/cs5520.c          |  3 +--
 drivers/ide/cs5530.c          |  3 +--
 drivers/ide/cs5535.c          |  3 +--
 drivers/ide/cs5536.c          |  3 +--
 drivers/ide/cy82c693.c        |  3 +--
 drivers/ide/delkin_cb.c       | 32 +++++---------------------
 drivers/ide/hpt366.c          |  3 +--
 drivers/ide/ide-pci-generic.c |  3 +--
 drivers/ide/it8172.c          |  3 +--
 drivers/ide/it8213.c          |  3 +--
 drivers/ide/it821x.c          |  3 +--
 drivers/ide/jmicron.c         |  3 +--
 drivers/ide/ns87415.c         |  3 +--
 drivers/ide/opti621.c         |  3 +--
 drivers/ide/pdc202xx_new.c    |  3 +--
 drivers/ide/pdc202xx_old.c    |  3 +--
 drivers/ide/piix.c            |  3 +--
 drivers/ide/sc1200.c          | 43 ++++++++++++-----------------------
 drivers/ide/serverworks.c     |  3 +--
 drivers/ide/setup-pci.c       | 29 +++++------------------
 drivers/ide/siimage.c         |  3 +--
 drivers/ide/sis5513.c         |  3 +--
 drivers/ide/sl82c105.c        |  3 +--
 drivers/ide/slc90e66.c        |  3 +--
 drivers/ide/triflex.c         | 24 +++++++------------
 drivers/ide/via82cxxx.c       |  3 +--
 include/linux/ide.h           |  8 +------
 32 files changed, 62 insertions(+), 155 deletions(-)

-- 
2.27.0

[PATCH v3 1/3] ide: use generic power management

[Vaibhav Gupta]

Earlier, drivers had to manage the device's power states, and related
operations, themselves. With the generic approach, these are done by PCI
core.

The ide_pci_suspend() and ide_pci_resume(), declared in
include/linux/ide.h and defined in drivers/ide/setup-pci.c, were external
and were exported. Those were then used by other source files.

Now, as they have to bind with dev_pm_ops object, there is no need to
export them and they can be made static.

Declare an extern const dev_pm_ops object in include/linux/ide.h and define
it in drivers/ide/setup-pci.c with SIMPLE_DEV_PM_OPS macro, binding
suspend, and resume callbacks with it. This object can now be used by other
source files.

The following source files are binding same dev_pm_ops object in their PM:
    drivers/ide/aec62xx.c
    drivers/ide/alim15x3.c
    drivers/ide/amd74xx.c
    drivers/ide/atiixp.c
    drivers/ide/cmd64x.c
    drivers/ide/cs5520.c
    drivers/ide/cs5530.c
    drivers/ide/cs5535.c
    drivers/ide/cs5536.c
    drivers/ide/cy82c693.c
    drivers/ide/hpt366.c
    drivers/ide/ide-pci-generic.c
    drivers/ide/it8172.c
    drivers/ide/it8213.c
    drivers/ide/it821x.c
    drivers/ide/jmicron.c
    drivers/ide/ns87415.c
    drivers/ide/opti621.c
    drivers/ide/pdc202xx_new.c
    drivers/ide/pdc202xx_old.c
    drivers/ide/piix.c
    drivers/ide/serverworks.c
    drivers/ide/setup-pci.c
    drivers/ide/siimage.c
    drivers/ide/sis5513.c
    drivers/ide/sl82c105.c
    drivers/ide/slc90e66.c
    drivers/ide/via82cxxx.c
    include/linux/ide.h

The drivers/ide/triflex.c driver was also using ide_pci_resume() callback
but it had its own definition for .suspend() as it does not want to power
off the device during suspend. Hence, disable its PM explicitly inside
triflex_init_one() as "dev->pm_caps = 0".

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/ide/aec62xx.c         |  3 +--
 drivers/ide/alim15x3.c        |  3 +--
 drivers/ide/amd74xx.c         |  3 +--
 drivers/ide/atiixp.c          |  3 +--
 drivers/ide/cmd64x.c          |  3 +--
 drivers/ide/cs5520.c          |  3 +--
 drivers/ide/cs5530.c          |  3 +--
 drivers/ide/cs5535.c          |  3 +--
 drivers/ide/cs5536.c          |  3 +--
 drivers/ide/cy82c693.c        |  3 +--
 drivers/ide/hpt366.c          |  3 +--
 drivers/ide/ide-pci-generic.c |  3 +--
 drivers/ide/it8172.c          |  3 +--
 drivers/ide/it8213.c          |  3 +--
 drivers/ide/it821x.c          |  3 +--
 drivers/ide/jmicron.c         |  3 +--
 drivers/ide/ns87415.c         |  3 +--
 drivers/ide/opti621.c         |  3 +--
 drivers/ide/pdc202xx_new.c    |  3 +--
 drivers/ide/pdc202xx_old.c    |  3 +--
 drivers/ide/piix.c            |  3 +--
 drivers/ide/serverworks.c     |  3 +--
 drivers/ide/setup-pci.c       | 29 ++++++-----------------------
 drivers/ide/siimage.c         |  3 +--
 drivers/ide/sis5513.c         |  3 +--
 drivers/ide/sl82c105.c        |  3 +--
 drivers/ide/slc90e66.c        |  3 +--
 drivers/ide/triflex.c         | 24 ++++++++----------------
 drivers/ide/via82cxxx.c       |  3 +--
 include/linux/ide.h           |  8 +-------
 30 files changed, 42 insertions(+), 100 deletions(-)

diff --git a/drivers/ide/aec62xx.c b/drivers/ide/aec62xx.c
index 4c959ce41ba9..375c7b4946f1 100644
--- a/drivers/ide/aec62xx.c
+++ b/drivers/ide/aec62xx.c
@@ -309,8 +309,7 @@ static struct pci_driver aec62xx_pci_driver = {
 	.id_table	= aec62xx_pci_tbl,
 	.probe		= aec62xx_init_one,
 	.remove		= aec62xx_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init aec62xx_ide_init(void)
diff --git a/drivers/ide/alim15x3.c b/drivers/ide/alim15x3.c
index 3265970aee34..a5043e048f91 100644
--- a/drivers/ide/alim15x3.c
+++ b/drivers/ide/alim15x3.c
@@ -580,8 +580,7 @@ static struct pci_driver alim15x3_pci_driver = {
 	.id_table	= alim15x3_pci_tbl,
 	.probe		= alim15x3_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init ali15x3_ide_init(void)
diff --git a/drivers/ide/amd74xx.c b/drivers/ide/amd74xx.c
index 7340597a373e..a9eb64b3e480 100644
--- a/drivers/ide/amd74xx.c
+++ b/drivers/ide/amd74xx.c
@@ -321,8 +321,7 @@ static struct pci_driver amd74xx_pci_driver = {
 	.id_table	= amd74xx_pci_tbl,
 	.probe		= amd74xx_probe,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init amd74xx_ide_init(void)
diff --git a/drivers/ide/atiixp.c b/drivers/ide/atiixp.c
index e08b0aac08b9..0bc98d5abaf4 100644
--- a/drivers/ide/atiixp.c
+++ b/drivers/ide/atiixp.c
@@ -190,8 +190,7 @@ static struct pci_driver atiixp_pci_driver = {
 	.id_table	= atiixp_pci_tbl,
 	.probe		= atiixp_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init atiixp_ide_init(void)
diff --git a/drivers/ide/cmd64x.c b/drivers/ide/cmd64x.c
index 943bf944bf72..480898a76133 100644
--- a/drivers/ide/cmd64x.c
+++ b/drivers/ide/cmd64x.c
@@ -430,8 +430,7 @@ static struct pci_driver cmd64x_pci_driver = {
 	.id_table	= cmd64x_pci_tbl,
 	.probe		= cmd64x_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init cmd64x_ide_init(void)
diff --git a/drivers/ide/cs5520.c b/drivers/ide/cs5520.c
index 89a4ff100b7a..ba0a5bc03d76 100644
--- a/drivers/ide/cs5520.c
+++ b/drivers/ide/cs5520.c
@@ -152,8 +152,7 @@ static struct pci_driver cs5520_pci_driver = {
 	.name		= "Cyrix_IDE",
 	.id_table	= cs5520_pci_tbl,
 	.probe		= cs5520_init_one,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init cs5520_ide_init(void)
diff --git a/drivers/ide/cs5530.c b/drivers/ide/cs5530.c
index 65371599b976..5bb46e7130c8 100644
--- a/drivers/ide/cs5530.c
+++ b/drivers/ide/cs5530.c
@@ -273,8 +273,7 @@ static struct pci_driver cs5530_pci_driver = {
 	.id_table	= cs5530_pci_tbl,
 	.probe		= cs5530_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init cs5530_ide_init(void)
diff --git a/drivers/ide/cs5535.c b/drivers/ide/cs5535.c
index 70fdbe3161f8..c5b79f84d274 100644
--- a/drivers/ide/cs5535.c
+++ b/drivers/ide/cs5535.c
@@ -194,8 +194,7 @@ static struct pci_driver cs5535_pci_driver = {
 	.id_table	= cs5535_pci_tbl,
 	.probe		= cs5535_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init cs5535_ide_init(void)
diff --git a/drivers/ide/cs5536.c b/drivers/ide/cs5536.c
index 8b5ca145191b..827cc6843934 100644
--- a/drivers/ide/cs5536.c
+++ b/drivers/ide/cs5536.c
@@ -279,8 +279,7 @@ static struct pci_driver cs5536_pci_driver = {
 	.id_table	= cs5536_pci_tbl,
 	.probe		= cs5536_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 module_pci_driver(cs5536_pci_driver);
diff --git a/drivers/ide/cy82c693.c b/drivers/ide/cy82c693.c
index bc01660ee8fd..511a870a352c 100644
--- a/drivers/ide/cy82c693.c
+++ b/drivers/ide/cy82c693.c
@@ -212,8 +212,7 @@ static struct pci_driver cy82c693_pci_driver = {
 	.id_table	= cy82c693_pci_tbl,
 	.probe		= cy82c693_init_one,
 	.remove		= cy82c693_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init cy82c693_ide_init(void)
diff --git a/drivers/ide/hpt366.c b/drivers/ide/hpt366.c
index fd3b5da44619..ecf58153ac8d 100644
--- a/drivers/ide/hpt366.c
+++ b/drivers/ide/hpt366.c
@@ -1523,8 +1523,7 @@ static struct pci_driver hpt366_pci_driver = {
 	.id_table	= hpt366_pci_tbl,
 	.probe		= hpt366_init_one,
 	.remove		= hpt366_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init hpt366_ide_init(void)
diff --git a/drivers/ide/ide-pci-generic.c b/drivers/ide/ide-pci-generic.c
index 673420db953f..cc677fbed6f1 100644
--- a/drivers/ide/ide-pci-generic.c
+++ b/drivers/ide/ide-pci-generic.c
@@ -181,8 +181,7 @@ static struct pci_driver generic_pci_driver = {
 	.id_table	= generic_pci_tbl,
 	.probe		= generic_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init generic_ide_init(void)
diff --git a/drivers/ide/it8172.c b/drivers/ide/it8172.c
index b6f674ab4fb7..d3b5147af7dd 100644
--- a/drivers/ide/it8172.c
+++ b/drivers/ide/it8172.c
@@ -143,8 +143,7 @@ static struct pci_driver it8172_pci_driver = {
 	.id_table	= it8172_pci_tbl,
 	.probe		= it8172_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init it8172_ide_init(void)
diff --git a/drivers/ide/it8213.c b/drivers/ide/it8213.c
index d0bf4430c437..56bc08ce5805 100644
--- a/drivers/ide/it8213.c
+++ b/drivers/ide/it8213.c
@@ -195,8 +195,7 @@ static struct pci_driver it8213_pci_driver = {
 	.id_table	= it8213_pci_tbl,
 	.probe		= it8213_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init it8213_ide_init(void)
diff --git a/drivers/ide/it821x.c b/drivers/ide/it821x.c
index 36a64c8ea575..aad746007330 100644
--- a/drivers/ide/it821x.c
+++ b/drivers/ide/it821x.c
@@ -690,8 +690,7 @@ static struct pci_driver it821x_pci_driver = {
 	.id_table	= it821x_pci_tbl,
 	.probe		= it821x_init_one,
 	.remove		= it821x_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init it821x_ide_init(void)
diff --git a/drivers/ide/jmicron.c b/drivers/ide/jmicron.c
index ae6480dcbadf..0fff50e712a2 100644
--- a/drivers/ide/jmicron.c
+++ b/drivers/ide/jmicron.c
@@ -154,8 +154,7 @@ static struct pci_driver jmicron_pci_driver = {
 	.id_table	= jmicron_pci_tbl,
 	.probe		= jmicron_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init jmicron_ide_init(void)
diff --git a/drivers/ide/ns87415.c b/drivers/ide/ns87415.c
index 11a672aba6ee..25c99265e85b 100644
--- a/drivers/ide/ns87415.c
+++ b/drivers/ide/ns87415.c
@@ -328,8 +328,7 @@ static struct pci_driver ns87415_pci_driver = {
 	.id_table	= ns87415_pci_tbl,
 	.probe		= ns87415_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init ns87415_ide_init(void)
diff --git a/drivers/ide/opti621.c b/drivers/ide/opti621.c
index c374f82333c6..9fa84e709c43 100644
--- a/drivers/ide/opti621.c
+++ b/drivers/ide/opti621.c
@@ -157,8 +157,7 @@ static struct pci_driver opti621_pci_driver = {
 	.id_table	= opti621_pci_tbl,
 	.probe		= opti621_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init opti621_ide_init(void)
diff --git a/drivers/ide/pdc202xx_new.c b/drivers/ide/pdc202xx_new.c
index 4fcafb9121e0..7c276b8aeb5f 100644
--- a/drivers/ide/pdc202xx_new.c
+++ b/drivers/ide/pdc202xx_new.c
@@ -535,8 +535,7 @@ static struct pci_driver pdc202new_pci_driver = {
 	.id_table	= pdc202new_pci_tbl,
 	.probe		= pdc202new_init_one,
 	.remove		= pdc202new_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init pdc202new_ide_init(void)
diff --git a/drivers/ide/pdc202xx_old.c b/drivers/ide/pdc202xx_old.c
index 5248ac064e6e..a902028dd5d2 100644
--- a/drivers/ide/pdc202xx_old.c
+++ b/drivers/ide/pdc202xx_old.c
@@ -340,8 +340,7 @@ static struct pci_driver pdc202xx_pci_driver = {
 	.id_table	= pdc202xx_pci_tbl,
 	.probe		= pdc202xx_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init pdc202xx_ide_init(void)
diff --git a/drivers/ide/piix.c b/drivers/ide/piix.c
index a671cead6ae7..2634768a4e66 100644
--- a/drivers/ide/piix.c
+++ b/drivers/ide/piix.c
@@ -453,8 +453,7 @@ static struct pci_driver piix_pci_driver = {
 	.id_table	= piix_pci_tbl,
 	.probe		= piix_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init piix_ide_init(void)
diff --git a/drivers/ide/serverworks.c b/drivers/ide/serverworks.c
index 458e72e034b0..cdc05b23e03b 100644
--- a/drivers/ide/serverworks.c
+++ b/drivers/ide/serverworks.c
@@ -434,8 +434,7 @@ static struct pci_driver svwks_pci_driver = {
 	.id_table	= svwks_pci_tbl,
 	.probe		= svwks_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init svwks_ide_init(void)
diff --git a/drivers/ide/setup-pci.c b/drivers/ide/setup-pci.c
index fdc8e813170c..1a8fb033e4b3 100644
--- a/drivers/ide/setup-pci.c
+++ b/drivers/ide/setup-pci.c
@@ -648,35 +648,18 @@ void ide_pci_remove(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(ide_pci_remove);
 
-#ifdef CONFIG_PM
-int ide_pci_suspend(struct pci_dev *dev, pm_message_t state)
-{
-	pci_save_state(dev);
-	pci_disable_device(dev);
-	pci_set_power_state(dev, pci_choose_state(dev, state));
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(ide_pci_suspend);
+#define ide_pci_suspend NULL
 
-int ide_pci_resume(struct pci_dev *dev)
+static int __maybe_unused ide_pci_resume(struct device *dev_d)
 {
+	struct pci_dev *dev = to_pci_dev(dev_d);
 	struct ide_host *host = pci_get_drvdata(dev);
-	int rc;
-
-	pci_set_power_state(dev, PCI_D0);
-
-	rc = pci_enable_device(dev);
-	if (rc)
-		return rc;
-
-	pci_restore_state(dev);
-	pci_set_master(dev);
 
 	if (host->init_chipset)
 		host->init_chipset(dev);
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(ide_pci_resume);
-#endif
+
+SIMPLE_DEV_PM_OPS(ide_pci_pm_ops, ide_pci_suspend, ide_pci_resume);
+EXPORT_SYMBOL_GPL(ide_pci_pm_ops);
diff --git a/drivers/ide/siimage.c b/drivers/ide/siimage.c
index c4b20f350b84..198847488cc6 100644
--- a/drivers/ide/siimage.c
+++ b/drivers/ide/siimage.c
@@ -821,8 +821,7 @@ static struct pci_driver siimage_pci_driver = {
 	.id_table	= siimage_pci_tbl,
 	.probe		= siimage_init_one,
 	.remove		= siimage_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init siimage_ide_init(void)
diff --git a/drivers/ide/sis5513.c b/drivers/ide/sis5513.c
index 024bc7ba49ee..410eddd3629f 100644
--- a/drivers/ide/sis5513.c
+++ b/drivers/ide/sis5513.c
@@ -615,8 +615,7 @@ static struct pci_driver sis5513_pci_driver = {
 	.id_table	= sis5513_pci_tbl,
 	.probe		= sis5513_init_one,
 	.remove		= sis5513_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init sis5513_ide_init(void)
diff --git a/drivers/ide/sl82c105.c b/drivers/ide/sl82c105.c
index 5c24c420c438..4ad5c6bce2b7 100644
--- a/drivers/ide/sl82c105.c
+++ b/drivers/ide/sl82c105.c
@@ -346,8 +346,7 @@ static struct pci_driver sl82c105_pci_driver = {
 	.id_table	= sl82c105_pci_tbl,
 	.probe		= sl82c105_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init sl82c105_ide_init(void)
diff --git a/drivers/ide/slc90e66.c b/drivers/ide/slc90e66.c
index f521d5ebf916..cd47445fda1f 100644
--- a/drivers/ide/slc90e66.c
+++ b/drivers/ide/slc90e66.c
@@ -160,8 +160,7 @@ static struct pci_driver slc90e66_pci_driver = {
 	.id_table	= slc90e66_pci_tbl,
 	.probe		= slc90e66_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init slc90e66_ide_init(void)
diff --git a/drivers/ide/triflex.c b/drivers/ide/triflex.c
index 16ddd0956832..f08a71c2ab63 100644
--- a/drivers/ide/triflex.c
+++ b/drivers/ide/triflex.c
@@ -91,6 +91,13 @@ static const struct ide_port_info triflex_device = {
 
 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
+	/*
+	 * We must not disable or powerdown the device.
+	 * APM bios refuses to suspend if IDE is not accessible.
+	 */
+	dev->pm_cap = 0;
+	dev_info(&dev->dev, "Disable triflex to be turned off by PCI CORE\n");
+
 	return ide_pci_init_one(dev, &triflex_device, NULL);
 }
 
@@ -100,27 +107,12 @@ static const struct pci_device_id triflex_pci_tbl[] = {
 };
 MODULE_DEVICE_TABLE(pci, triflex_pci_tbl);
 
-#ifdef CONFIG_PM
-static int triflex_ide_pci_suspend(struct pci_dev *dev, pm_message_t state)
-{
-	/*
-	 * We must not disable or powerdown the device.
-	 * APM bios refuses to suspend if IDE is not accessible.
-	 */
-	pci_save_state(dev);
-	return 0;
-}
-#else
-#define triflex_ide_pci_suspend NULL
-#endif
-
 static struct pci_driver triflex_pci_driver = {
 	.name		= "TRIFLEX_IDE",
 	.id_table	= triflex_pci_tbl,
 	.probe		= triflex_init_one,
 	.remove		= ide_pci_remove,
-	.suspend	= triflex_ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init triflex_ide_init(void)
diff --git a/drivers/ide/via82cxxx.c b/drivers/ide/via82cxxx.c
index 63a3aca506fc..166feaeed6e3 100644
--- a/drivers/ide/via82cxxx.c
+++ b/drivers/ide/via82cxxx.c
@@ -510,8 +510,7 @@ static struct pci_driver via_pci_driver = {
 	.id_table 	= via_pci_tbl,
 	.probe 		= via_init_one,
 	.remove		= via_remove,
-	.suspend	= ide_pci_suspend,
-	.resume		= ide_pci_resume,
+	.driver.pm	= &ide_pci_pm_ops,
 };
 
 static int __init via_ide_init(void)
diff --git a/include/linux/ide.h b/include/linux/ide.h
index a254841bd315..77b41103e12b 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1394,13 +1394,7 @@ int ide_pci_init_two(struct pci_dev *, struct pci_dev *,
 		     const struct ide_port_info *, void *);
 void ide_pci_remove(struct pci_dev *);
 
-#ifdef CONFIG_PM
-int ide_pci_suspend(struct pci_dev *, pm_message_t);
-int ide_pci_resume(struct pci_dev *);
-#else
-#define ide_pci_suspend NULL
-#define ide_pci_resume NULL
-#endif
+extern const struct dev_pm_ops ide_pci_pm_ops;
 
 void ide_map_sg(ide_drive_t *, struct ide_cmd *);
 void ide_init_sg_cmd(struct ide_cmd *, unsigned int);
-- 
2.27.0

[PATCH v3 2/3] ide: sc1200: use generic power management

[Vaibhav Gupta]

With the support of generic PM callbacks, drivers no longer need to use
legacy .suspend() and .resume() in which they had to maintain PCI states
changes and device's power state themselves. The required operations are
done by PCI core.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/ide/sc1200.c | 43 ++++++++++++++-----------------------------
 1 file changed, 14 insertions(+), 29 deletions(-)

diff --git a/drivers/ide/sc1200.c b/drivers/ide/sc1200.c
index a5b701818405..91a197832d1f 100644
--- a/drivers/ide/sc1200.c
+++ b/drivers/ide/sc1200.c
@@ -222,46 +222,33 @@ static void sc1200_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 	sc1200_tunepio(drive, pio);
 }
 
-#ifdef CONFIG_PM
 struct sc1200_saved_state {
 	u32 regs[8];
 };
 
-static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
+static int __maybe_unused sc1200_suspend(struct device *dev_d)
 {
-	printk("SC1200: suspend(%u)\n", state.event);
+	struct pci_dev *dev = to_pci_dev(dev_d);
+	struct ide_host *host = pci_get_drvdata(dev);
+	struct sc1200_saved_state *ss = host->host_priv;
+	unsigned int r;
 
 	/*
-	 * we only save state when going from full power to less
+	 * save timing registers
+	 * (this may be unnecessary if BIOS also does it)
 	 */
-	if (state.event == PM_EVENT_ON) {
-		struct ide_host *host = pci_get_drvdata(dev);
-		struct sc1200_saved_state *ss = host->host_priv;
-		unsigned int r;
-
-		/*
-		 * save timing registers
-		 * (this may be unnecessary if BIOS also does it)
-		 */
-		for (r = 0; r < 8; r++)
-			pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
-	}
+	for (r = 0; r < 8; r++)
+		pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
 
-	pci_disable_device(dev);
-	pci_set_power_state(dev, pci_choose_state(dev, state));
 	return 0;
 }
 
-static int sc1200_resume (struct pci_dev *dev)
+static int __maybe_unused sc1200_resume(struct device *dev_d)
 {
+	struct pci_dev *dev = to_pci_dev(dev_d);
 	struct ide_host *host = pci_get_drvdata(dev);
 	struct sc1200_saved_state *ss = host->host_priv;
 	unsigned int r;
-	int i;
-
-	i = pci_enable_device(dev);
-	if (i)
-		return i;
 
 	/*
 	 * restore timing registers
@@ -272,7 +259,6 @@ static int sc1200_resume (struct pci_dev *dev)
 
 	return 0;
 }
-#endif
 
 static const struct ide_port_ops sc1200_port_ops = {
 	.set_pio_mode		= sc1200_set_pio_mode,
@@ -326,15 +312,14 @@ static const struct pci_device_id sc1200_pci_tbl[] = {
 };
 MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
 
+static SIMPLE_DEV_PM_OPS(sc1200_pm_ops, sc1200_suspend, sc1200_resume);
+
 static struct pci_driver sc1200_pci_driver = {
 	.name		= "SC1200_IDE",
 	.id_table	= sc1200_pci_tbl,
 	.probe		= sc1200_init_one,
 	.remove		= ide_pci_remove,
-#ifdef CONFIG_PM
-	.suspend	= sc1200_suspend,
-	.resume		= sc1200_resume,
-#endif
+	.driver.pm	= &sc1200_pm_ops,
 };
 
 static int __init sc1200_ide_init(void)
-- 
2.27.0

[PATCH v3 3/3] ide: delkin_cb: use generic power management

[Vaibhav Gupta]

With the support of generic PM callbacks, drivers no longer need to use
legacy .suspend() and .resume() in which they had to maintain PCI states
changes and device's power state themselves. All required operations are
done by PCI core.

After converting it into generic model, suspend() became an empty function.
Hence, it is defined as NULL.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/ide/delkin_cb.c | 32 ++++++--------------------------
 1 file changed, 6 insertions(+), 26 deletions(-)

diff --git a/drivers/ide/delkin_cb.c b/drivers/ide/delkin_cb.c
index 300daabaa575..a711b64dbd1c 100644
--- a/drivers/ide/delkin_cb.c
+++ b/drivers/ide/delkin_cb.c
@@ -123,39 +123,18 @@ delkin_cb_remove (struct pci_dev *dev)
 	pci_disable_device(dev);
 }
 
-#ifdef CONFIG_PM
-static int delkin_cb_suspend(struct pci_dev *dev, pm_message_t state)
-{
-	pci_save_state(dev);
-	pci_disable_device(dev);
-	pci_set_power_state(dev, pci_choose_state(dev, state));
-
-	return 0;
-}
+#define delkin_cb_suspend NULL
 
-static int delkin_cb_resume(struct pci_dev *dev)
+static int __maybe_unused delkin_cb_resume(struct device *dev_d)
 {
+	struct pci_dev *dev = to_pci_dev(dev_d);
 	struct ide_host *host = pci_get_drvdata(dev);
-	int rc;
-
-	pci_set_power_state(dev, PCI_D0);
-
-	rc = pci_enable_device(dev);
-	if (rc)
-		return rc;
-
-	pci_restore_state(dev);
-	pci_set_master(dev);
 
 	if (host->init_chipset)
 		host->init_chipset(dev);
 
 	return 0;
 }
-#else
-#define delkin_cb_suspend NULL
-#define delkin_cb_resume NULL
-#endif
 
 static struct pci_device_id delkin_cb_pci_tbl[] = {
 	{ 0x1145, 0xf021, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
@@ -164,13 +143,14 @@ static struct pci_device_id delkin_cb_pci_tbl[] = {
 };
 MODULE_DEVICE_TABLE(pci, delkin_cb_pci_tbl);
 
+static SIMPLE_DEV_PM_OPS(delkin_cb_pm_ops, delkin_cb_suspend, delkin_cb_resume);
+
 static struct pci_driver delkin_cb_pci_driver = {
 	.name		= "Delkin-ASKA-Workbit Cardbus IDE",
 	.id_table	= delkin_cb_pci_tbl,
 	.probe		= delkin_cb_probe,
 	.remove		= delkin_cb_remove,
-	.suspend	= delkin_cb_suspend,
-	.resume		= delkin_cb_resume,
+	.driver.pm	= &delkin_cb_pm_ops,
 };
 
 module_pci_driver(delkin_cb_pci_driver);
-- 
2.27.0

Re: [PATCH v3 0/3] drivers: ide: use generic power management

[Bartlomiej Zolnierkiewicz]

Hi,

On 7/13/20 7:36 PM, Vaibhav Gupta wrote:
> Linux Kernel Mentee: Remove Legacy Power Management.
> 
> The purpose of this patch series is to remove legacy power management callbacks
> from ide drivers.
> 
> The suspend() and resume() callbacks operations are still invoking
> pci_save/restore_state(), pci_set_power_state(), pci_enable/disable_state(),
> etc. and handling the power management themselves, which is not recommended.
> 
> The conversion requires the removal of the those function calls and change the
> callback definition accordingly and make use of dev_pm_ops structure.

IDE subsystem (drivers/ide/) is deprecated and has been superseded by libata
subsystem (drivers/ata/).

libata drivers have the same issue so please concentrate on fixing them
first. Later (if desirable) changes can be back-ported to drivers/ide/.

> All patches are compile-tested only.

This patchset needs (at least) some basic testing. It should be easier with
libata subsystem as it also support SATA controllers and devices.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> v3:
>     - Modpost error for undefined reference by Kbuild in v1.
>     - Another approach to disable PM in drivers/ide/triflex.c suggested by
>       Bjorn Helgaas in v2.
> 
> Test tools:
>     - Compiler: gcc (GCC) 10.1.0
>     - allmodconfig build: make -j$(nproc) W=1 all
> 
> Vaibhav Gupta (3):
>   ide: use generic power management
>   ide: sc1200: use generic power management
>   ide: delkin_cb: use generic power management
> 
>  drivers/ide/aec62xx.c         |  3 +--
>  drivers/ide/alim15x3.c        |  3 +--
>  drivers/ide/amd74xx.c         |  3 +--
>  drivers/ide/atiixp.c          |  3 +--
>  drivers/ide/cmd64x.c          |  3 +--
>  drivers/ide/cs5520.c          |  3 +--
>  drivers/ide/cs5530.c          |  3 +--
>  drivers/ide/cs5535.c          |  3 +--
>  drivers/ide/cs5536.c          |  3 +--
>  drivers/ide/cy82c693.c        |  3 +--
>  drivers/ide/delkin_cb.c       | 32 +++++---------------------
>  drivers/ide/hpt366.c          |  3 +--
>  drivers/ide/ide-pci-generic.c |  3 +--
>  drivers/ide/it8172.c          |  3 +--
>  drivers/ide/it8213.c          |  3 +--
>  drivers/ide/it821x.c          |  3 +--
>  drivers/ide/jmicron.c         |  3 +--
>  drivers/ide/ns87415.c         |  3 +--
>  drivers/ide/opti621.c         |  3 +--
>  drivers/ide/pdc202xx_new.c    |  3 +--
>  drivers/ide/pdc202xx_old.c    |  3 +--
>  drivers/ide/piix.c            |  3 +--
>  drivers/ide/sc1200.c          | 43 ++++++++++++-----------------------
>  drivers/ide/serverworks.c     |  3 +--
>  drivers/ide/setup-pci.c       | 29 +++++------------------
>  drivers/ide/siimage.c         |  3 +--
>  drivers/ide/sis5513.c         |  3 +--
>  drivers/ide/sl82c105.c        |  3 +--
>  drivers/ide/slc90e66.c        |  3 +--
>  drivers/ide/triflex.c         | 24 +++++++------------
>  drivers/ide/via82cxxx.c       |  3 +--
>  include/linux/ide.h           |  8 +------
>  32 files changed, 62 insertions(+), 155 deletions(-)
> 

Re: [PATCH v3 0/3] drivers: ide: use generic power management

[Vaibhav Gupta]

On Tue, Jul 14, 2020 at 09:32:56AM +0200, Bartlomiej Zolnierkiewicz wrote:
> 
> Hi,
> 
> On 7/13/20 7:36 PM, Vaibhav Gupta wrote:
> > Linux Kernel Mentee: Remove Legacy Power Management.
> > 
> > The purpose of this patch series is to remove legacy power management callbacks
> > from ide drivers.
> > 
> > The suspend() and resume() callbacks operations are still invoking
> > pci_save/restore_state(), pci_set_power_state(), pci_enable/disable_state(),
> > etc. and handling the power management themselves, which is not recommended.
> > 
> > The conversion requires the removal of the those function calls and change the
> > callback definition accordingly and make use of dev_pm_ops structure.
> 
> IDE subsystem (drivers/ide/) is deprecated and has been superseded by libata
> subsystem (drivers/ata/).
> 
> libata drivers have the same issue so please concentrate on fixing them
> first. Later (if desirable) changes can be back-ported to drivers/ide/.
>
Hello, (drivers/ide) and (drivers/ata) are the two major families, I am working
on, for generic PM upgradation. I was bit unaware about priority, and also in
the last, both ide and ata drivers have to be upgraded.
> > All patches are compile-tested only.
> 
> This patchset needs (at least) some basic testing. It should be easier with
> libata subsystem as it also support SATA controllers and devices.
To upgrade PM in (drivers/ide) I have made .suspend() and .resume() static. Then
bind them in "struct dev_pm_ops" variable (ide_pci_pm_ops) and expose it using
EXPORT_SYMBOL_GPL(). This has affected 30 drivers. I was hoping if ide changes
can be tested/verified, specially [PATCH 1/3]. As then, I will be sure about
similar change in ata, as it also requires similar alteration.

Thanks
Vaibhav Gupta

> 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
> 
> > v3:
> >     - Modpost error for undefined reference by Kbuild in v1.
> >     - Another approach to disable PM in drivers/ide/triflex.c suggested by
> >       Bjorn Helgaas in v2.
> > 
> > Test tools:
> >     - Compiler: gcc (GCC) 10.1.0
> >     - allmodconfig build: make -j$(nproc) W=1 all
> > 
> > Vaibhav Gupta (3):
> >   ide: use generic power management
> >   ide: sc1200: use generic power management
> >   ide: delkin_cb: use generic power management
> > 
> >  drivers/ide/aec62xx.c         |  3 +--
> >  drivers/ide/alim15x3.c        |  3 +--
> >  drivers/ide/amd74xx.c         |  3 +--
> >  drivers/ide/atiixp.c          |  3 +--
> >  drivers/ide/cmd64x.c          |  3 +--
> >  drivers/ide/cs5520.c          |  3 +--
> >  drivers/ide/cs5530.c          |  3 +--
> >  drivers/ide/cs5535.c          |  3 +--
> >  drivers/ide/cs5536.c          |  3 +--
> >  drivers/ide/cy82c693.c        |  3 +--
> >  drivers/ide/delkin_cb.c       | 32 +++++---------------------
> >  drivers/ide/hpt366.c          |  3 +--
> >  drivers/ide/ide-pci-generic.c |  3 +--
> >  drivers/ide/it8172.c          |  3 +--
> >  drivers/ide/it8213.c          |  3 +--
> >  drivers/ide/it821x.c          |  3 +--
> >  drivers/ide/jmicron.c         |  3 +--
> >  drivers/ide/ns87415.c         |  3 +--
> >  drivers/ide/opti621.c         |  3 +--
> >  drivers/ide/pdc202xx_new.c    |  3 +--
> >  drivers/ide/pdc202xx_old.c    |  3 +--
> >  drivers/ide/piix.c            |  3 +--
> >  drivers/ide/sc1200.c          | 43 ++++++++++++-----------------------
> >  drivers/ide/serverworks.c     |  3 +--
> >  drivers/ide/setup-pci.c       | 29 +++++------------------
> >  drivers/ide/siimage.c         |  3 +--
> >  drivers/ide/sis5513.c         |  3 +--
> >  drivers/ide/sl82c105.c        |  3 +--
> >  drivers/ide/slc90e66.c        |  3 +--
> >  drivers/ide/triflex.c         | 24 +++++++------------
> >  drivers/ide/via82cxxx.c       |  3 +--
> >  include/linux/ide.h           |  8 +------
> >  32 files changed, 62 insertions(+), 155 deletions(-)
> > 
> 

Re: [PATCH v3 0/3] drivers: ide: use generic power management

[Bartlomiej Zolnierkiewicz]

On 7/14/20 9:52 AM, Vaibhav Gupta wrote:
> On Tue, Jul 14, 2020 at 09:32:56AM +0200, Bartlomiej Zolnierkiewicz wrote:
>>
>> Hi,
>>
>> On 7/13/20 7:36 PM, Vaibhav Gupta wrote:
>>> Linux Kernel Mentee: Remove Legacy Power Management.
>>>
>>> The purpose of this patch series is to remove legacy power management callbacks
>>> from ide drivers.
>>>
>>> The suspend() and resume() callbacks operations are still invoking
>>> pci_save/restore_state(), pci_set_power_state(), pci_enable/disable_state(),
>>> etc. and handling the power management themselves, which is not recommended.
>>>
>>> The conversion requires the removal of the those function calls and change the
>>> callback definition accordingly and make use of dev_pm_ops structure.
>>
>> IDE subsystem (drivers/ide/) is deprecated and has been superseded by libata
>> subsystem (drivers/ata/).
>>
>> libata drivers have the same issue so please concentrate on fixing them
>> first. Later (if desirable) changes can be back-ported to drivers/ide/.
>>
> Hello, (drivers/ide) and (drivers/ata) are the two major families, I am working
> on, for generic PM upgradation. I was bit unaware about priority, and also in
> the last, both ide and ata drivers have to be upgraded.

Well, drivers/ide/ is scheduled for removal in 2021
(it even prints the warning during initialization of
every host driver)..

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

>>> All patches are compile-tested only.
>>
>> This patchset needs (at least) some basic testing. It should be easier with
>> libata subsystem as it also support SATA controllers and devices.
> To upgrade PM in (drivers/ide) I have made .suspend() and .resume() static. Then
> bind them in "struct dev_pm_ops" variable (ide_pci_pm_ops) and expose it using
> EXPORT_SYMBOL_GPL(). This has affected 30 drivers. I was hoping if ide changes
> can be tested/verified, specially [PATCH 1/3]. As then, I will be sure about
> similar change in ata, as it also requires similar alteration.
> 
> Thanks
> Vaibhav Gupta
> 
>>
>> Best regards,
>> --
>> Bartlomiej Zolnierkiewicz
>> Samsung R&D Institute Poland
>> Samsung Electronics
>>
>>> v3:
>>>     - Modpost error for undefined reference by Kbuild in v1.
>>>     - Another approach to disable PM in drivers/ide/triflex.c suggested by
>>>       Bjorn Helgaas in v2.
>>>
>>> Test tools:
>>>     - Compiler: gcc (GCC) 10.1.0
>>>     - allmodconfig build: make -j$(nproc) W=1 all
>>>
>>> Vaibhav Gupta (3):
>>>   ide: use generic power management
>>>   ide: sc1200: use generic power management
>>>   ide: delkin_cb: use generic power management
>>>
>>>  drivers/ide/aec62xx.c         |  3 +--
>>>  drivers/ide/alim15x3.c        |  3 +--
>>>  drivers/ide/amd74xx.c         |  3 +--
>>>  drivers/ide/atiixp.c          |  3 +--
>>>  drivers/ide/cmd64x.c          |  3 +--
>>>  drivers/ide/cs5520.c          |  3 +--
>>>  drivers/ide/cs5530.c          |  3 +--
>>>  drivers/ide/cs5535.c          |  3 +--
>>>  drivers/ide/cs5536.c          |  3 +--
>>>  drivers/ide/cy82c693.c        |  3 +--
>>>  drivers/ide/delkin_cb.c       | 32 +++++---------------------
>>>  drivers/ide/hpt366.c          |  3 +--
>>>  drivers/ide/ide-pci-generic.c |  3 +--
>>>  drivers/ide/it8172.c          |  3 +--
>>>  drivers/ide/it8213.c          |  3 +--
>>>  drivers/ide/it821x.c          |  3 +--
>>>  drivers/ide/jmicron.c         |  3 +--
>>>  drivers/ide/ns87415.c         |  3 +--
>>>  drivers/ide/opti621.c         |  3 +--
>>>  drivers/ide/pdc202xx_new.c    |  3 +--
>>>  drivers/ide/pdc202xx_old.c    |  3 +--
>>>  drivers/ide/piix.c            |  3 +--
>>>  drivers/ide/sc1200.c          | 43 ++++++++++++-----------------------
>>>  drivers/ide/serverworks.c     |  3 +--
>>>  drivers/ide/setup-pci.c       | 29 +++++------------------
>>>  drivers/ide/siimage.c         |  3 +--
>>>  drivers/ide/sis5513.c         |  3 +--
>>>  drivers/ide/sl82c105.c        |  3 +--
>>>  drivers/ide/slc90e66.c        |  3 +--
>>>  drivers/ide/triflex.c         | 24 +++++++------------
>>>  drivers/ide/via82cxxx.c       |  3 +--
>>>  include/linux/ide.h           |  8 +------
>>>  32 files changed, 62 insertions(+), 155 deletions(-)
>>>
>>
> 
> 

Re: [PATCH v3 0/3] drivers: ide: use generic power management

[Vaibhav Gupta]

On Tue, Jul 14, 2020 at 10:19:06AM +0200, Bartlomiej Zolnierkiewicz wrote:
> 
> On 7/14/20 9:52 AM, Vaibhav Gupta wrote:
> > On Tue, Jul 14, 2020 at 09:32:56AM +0200, Bartlomiej Zolnierkiewicz wrote:
> >>
> >>
> >> IDE subsystem (drivers/ide/) is deprecated and has been superseded by libata
> >> subsystem (drivers/ata/).
> >>
> >> libata drivers have the same issue so please concentrate on fixing them
> >> first. Later (if desirable) changes can be back-ported to drivers/ide/.
> >>
> > Hello, (drivers/ide) and (drivers/ata) are the two major families, I am working
> > on, for generic PM upgradation. I was bit unaware about priority, and also in
> > the last, both ide and ata drivers have to be upgraded.
> 
> Well, drivers/ide/ is scheduled for removal in 2021
> (it even prints the warning during initialization of
> every host driver)..
Okay then, I will start with ata family.

Thanks,
Vaibhav Gupta
> 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
> 
> >>> All patches are compile-tested only.
> >>
> >> This patchset needs (at least) some basic testing. It should be easier with
> >> libata subsystem as it also support SATA controllers and devices.
> > To upgrade PM in (drivers/ide) I have made .suspend() and .resume() static. Then
> > bind them in "struct dev_pm_ops" variable (ide_pci_pm_ops) and expose it using
> > EXPORT_SYMBOL_GPL(). This has affected 30 drivers. I was hoping if ide changes
> > can be tested/verified, specially [PATCH 1/3]. As then, I will be sure about
> > similar change in ata, as it also requires similar alteration.
> > 
> > Thanks
> > Vaibhav Gupta
> > 
> >>
> >> Best regards,
> >> --
> >> Bartlomiej Zolnierkiewicz
> >> Samsung R&D Institute Poland
> >> Samsung Electronics
> >>

Re: [PATCH v3 0/3] drivers: ide: use generic power management

[David Miller]

From: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Date: Mon, 13 Jul 2020 23:06:10 +0530

> Linux Kernel Mentee: Remove Legacy Power Management.
> 
> The purpose of this patch series is to remove legacy power management callbacks
> from ide drivers.
> 
> The suspend() and resume() callbacks operations are still invoking
> pci_save/restore_state(), pci_set_power_state(), pci_enable/disable_state(),
> etc. and handling the power management themselves, which is not recommended.
> 
> The conversion requires the removal of the those function calls and change the
> callback definition accordingly and make use of dev_pm_ops structure.

Series applied.