linux-kernel - [PATCH V3 4/6] PCI: Wait device ready after pci_pm

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Message-Id: <1514912423-13341-5-git-send-email-okaya@codeaurora.org>
Date:   Tue,  2 Jan 2018 12:00:21 -0500
From:   Sinan Kaya <okaya@...eaurora.org>
To:     linux-pci@...r.kernel.org, timur@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Sinan Kaya <okaya@...eaurora.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH V3 4/6] PCI: Wait device ready after pci_pm_reset()

Rev 3.1 Sec 2.3.1 Request Handling Rules says a device can issue CRS
following a D3hot->D0 transition. Add pci_dev_wait() call to see if
device is available before returning.

Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
Reviewed-by: Christoph Hellwig <hch@....de>
---
 drivers/pci/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 736d809..09eae93 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4116,7 +4116,7 @@ static int pci_pm_reset(struct pci_dev *dev, int probe)
 	pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr);
 	pci_dev_d3_sleep(dev);
 
-	return 0;
+	return pci_dev_wait(dev, "PM D3->D0", PCIE_RESET_READY_POLL_MS);
 }
 
 void pci_reset_secondary_bus(struct pci_dev *dev)
-- 
1.9.1