linux-kernel-mentees.lists.linuxfoundation.org archive mirror
 help / color / mirror / Atom feed
From: Vaibhav Gupta <vaibhavgupta40@gmail.com>
To: Bjorn Helgaas <helgaas@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Bjorn Helgaas <bjorn@helgaas.com>,
	Vaibhav Gupta <vaibhav.varodek@gmail.com>,
	David Airlie <airlied@linux.ie>
Cc: linux-kernel-mentees@lists.linuxfoundation.org,
	linux-kernel@vger.kernel.org
Subject: [Linux-kernel-mentees] [PATCH v2 1/3] amd64-agp: use generic power management
Date: Tue, 12 Jan 2021 13:39:22 +0530	[thread overview]
Message-ID: <20210112080924.1038907-2-vaibhavgupta40@gmail.com> (raw)
In-Reply-To: <20210112080924.1038907-1-vaibhavgupta40@gmail.com>

Drivers should do only device-specific jobs. But in general, drivers using
legacy PCI PM framework for .suspend()/.resume() have to manage many PCI
PM-related tasks themselves which can be done by PCI Core itself. This
brings extra load on the driver and it directly calls PCI helper functions
to handle them.

Switch to the new generic framework by updating function signatures and
define a "struct dev_pm_ops" variable to bind PM callbacks. Also, remove
unnecessary calls to the PCI Helper functions along with the legacy
.suspend & .resume bindings.

After upgrading, .suspend() became an empty-body function, hence defined as
NULL.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/char/agp/amd64-agp.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c
index b40edae32817..dc78a4fb879e 100644
--- a/drivers/char/agp/amd64-agp.c
+++ b/drivers/char/agp/amd64-agp.c
@@ -588,20 +588,11 @@ static void agp_amd64_remove(struct pci_dev *pdev)
 	agp_bridges_found--;
 }
 
-#ifdef CONFIG_PM
+#define agp_amd64_suspend NULL
 
-static int agp_amd64_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused agp_amd64_resume(struct device *dev)
 {
-	pci_save_state(pdev);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
-
-	return 0;
-}
-
-static int agp_amd64_resume(struct pci_dev *pdev)
-{
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
+	struct pci_dev *pdev = to_pci_dev(dev);
 
 	if (pdev->vendor == PCI_VENDOR_ID_NVIDIA)
 		nforce3_agp_init(pdev);
@@ -609,8 +600,6 @@ static int agp_amd64_resume(struct pci_dev *pdev)
 	return amd_8151_configure();
 }
 
-#endif /* CONFIG_PM */
-
 static const struct pci_device_id agp_amd64_pci_table[] = {
 	{
 	.class		= (PCI_CLASS_BRIDGE_HOST << 8),
@@ -738,15 +727,14 @@ static const struct pci_device_id agp_amd64_pci_promisc_table[] = {
 	{ }
 };
 
+static SIMPLE_DEV_PM_OPS(agp_amd64_pm_ops, agp_amd64_suspend, agp_amd64_resume);
+
 static struct pci_driver agp_amd64_pci_driver = {
 	.name		= "agpgart-amd64",
 	.id_table	= agp_amd64_pci_table,
 	.probe		= agp_amd64_probe,
 	.remove		= agp_amd64_remove,
-#ifdef CONFIG_PM
-	.suspend	= agp_amd64_suspend,
-	.resume		= agp_amd64_resume,
-#endif
+	.driver.pm  = &agp_amd64_pm_ops,
 };
 
 
-- 
2.30.0

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

  reply	other threads:[~2021-01-12  8:13 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-17  7:49 [Linux-kernel-mentees] [PATCH v1 0/3] char: " Vaibhav Gupta
2020-07-17  7:49 ` [Linux-kernel-mentees] [PATCH v1 1/3] amd64-agp: " Vaibhav Gupta
2020-07-17  7:49 ` [Linux-kernel-mentees] [PATCH v1 2/3] sis-agp: " Vaibhav Gupta
2020-07-17  7:49 ` [Linux-kernel-mentees] [PATCH v1 3/3] via-agp: " Vaibhav Gupta
2020-08-17  7:49 ` [Linux-kernel-mentees] [PATCH v1 0/3] char: " Vaibhav Gupta
2021-01-12  8:09 ` [Linux-kernel-mentees] [PATCH v2 " Vaibhav Gupta
2021-01-12  8:09   ` Vaibhav Gupta [this message]
2021-01-12  8:09   ` [Linux-kernel-mentees] [PATCH v2 2/3] sis-agp: " Vaibhav Gupta
2021-01-12  8:09   ` [Linux-kernel-mentees] [PATCH v2 3/3] via-agp: " Vaibhav Gupta

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210112080924.1038907-2-vaibhavgupta40@gmail.com \
    --to=vaibhavgupta40@gmail.com \
    --cc=airlied@linux.ie \
    --cc=bhelgaas@google.com \
    --cc=bjorn@helgaas.com \
    --cc=helgaas@kernel.org \
    --cc=linux-kernel-mentees@lists.linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=vaibhav.varodek@gmail.com \
    --subject='Re: [Linux-kernel-mentees] [PATCH v2 1/3] amd64-agp: use generic power management' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).