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Tue, 27 Feb 2024 11:56:53 +0530 (IST) Received: by inlubt0316.iind.intel.com (Postfix, from userid 12101951) id 3F0871600101; Tue, 27 Feb 2024 11:56:53 +0530 (IST) From: Raag Jadav To: bhelgaas@google.com, jarkko.nikula@linux.intel.com, mika.westerberg@linux.intel.com, andriy.shevchenko@linux.intel.com, stanislaw.gruszka@linux.intel.com, lukas@wunner.de, rafael@kernel.org, ilpo.jarvinen@linux.intel.com Cc: linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, sashal@kernel.org, Raag Jadav Subject: [PATCH v2] PCI / PM: Really allow runtime PM without callback functions Date: Tue, 27 Feb 2024 11:56:48 +0530 Message-Id: <20240227062648.16579-1-raag.jadav@intel.com> X-Mailer: git-send-email 2.35.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1792040187191787451 X-GMAIL-MSGID: 1792040187191787451 Commit c5eb1190074c ("PCI / PM: Allow runtime PM without callback functions") tried to eliminate the need for runtime PM callbacks by modifying pci_pm_runtime_suspend() and pci_pm_runtime_resume(), but didn't modify pci_pm_runtime_idle() with relevant changes, which still returns -ENOSYS if the driver supplies no runtime PM callbacks. Modify pci_pm_runtime_idle() such that it allows PCI device power state transitions without runtime PM callbacks and complete the original intention of commit c5eb1190074c ("PCI / PM: Allow runtime PM without callback functions"). Signed-off-by: Raag Jadav Acked-by: Rafael J. Wysocki Tested-by: Jarkko Nikula Reviewed-by: Andy Shevchenko Reviewed-by: Stanislaw Gruszka --- This is not marked for linux-stable for the need of extensive testing and can be backported after a few releases if no issues are reported. Changes since v1: - Update commit message and tags drivers/pci/pci-driver.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 51ec9e7e784f..bb7f6775b350 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -1382,10 +1382,7 @@ static int pci_pm_runtime_idle(struct device *dev) if (!pci_dev->driver) return 0; - if (!pm) - return -ENOSYS; - - if (pm->runtime_idle) + if (pm && pm->runtime_idle) return pm->runtime_idle(dev); return 0;