From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753945AbaCNKAs (ORCPT ); Fri, 14 Mar 2014 06:00:48 -0400 Received: from mga02.intel.com ([134.134.136.20]:28334 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751011AbaCNKAr (ORCPT ); Fri, 14 Mar 2014 06:00:47 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,653,1389772800"; d="scan'208";a="491842100" From: Chew Chiau Ee To: Viresh Kumar , Andy Shevchenko Cc: Vinod Koul , Dan Williams , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Chew Chiau Ee , Lim Lee Booi Subject: [PATCH v2] dma: dw: Add suspend and resume handling for PCI mode DW_DMAC. Date: Sat, 15 Mar 2014 02:02:39 +0800 Message-Id: <1394820159-562-1-git-send-email-chiau.ee.chew@intel.com> X-Mailer: git-send-email 1.7.4.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chew, Chiau Ee This is to disable/enable DW_DMAC hw during late suspend/early resume. Since DMA is providing service to other clients (eg: SPI, HSUART), we need to ensure DMA suspends after the clients and resume before the clients are active. Signed-off-by: Chew, Chiau Ee --- v2 changelog: * Change suspend_noirq and resume_noirq callback to suspend_late and resume_early. drivers/dma/dw/pci.c | 33 +++++++++++++++++++++++++++++++++ 1 files changed, 33 insertions(+), 0 deletions(-) diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c index 755cc6b..fec59f1 100644 --- a/drivers/dma/dw/pci.c +++ b/drivers/dma/dw/pci.c @@ -75,6 +75,36 @@ static void dw_pci_remove(struct pci_dev *pdev) dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret); } +#ifdef CONFIG_PM_SLEEP + +static int dw_pci_suspend_late(struct device *dev) +{ + struct pci_dev *pci = to_pci_dev(dev); + struct dw_dma_chip *chip = pci_get_drvdata(pci); + + return dw_dma_suspend(chip); +}; + +static int dw_pci_resume_early(struct device *dev) +{ + struct pci_dev *pci = to_pci_dev(dev); + struct dw_dma_chip *chip = pci_get_drvdata(pci); + + return dw_dma_resume(chip); +}; + +#else /* !CONFIG_PM_SLEEP */ + +#define dw_pci_suspend_late NULL +#define dw_pci_resume_early NULL + +#endif /* !CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops dw_pci_dev_pm_ops = { + .suspend_late = dw_pci_suspend_late, + .resume_early = dw_pci_resume_early, +}; + static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = { /* Medfield */ { PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata }, @@ -95,6 +125,9 @@ static struct pci_driver dw_pci_driver = { .id_table = dw_pci_id_table, .probe = dw_pci_probe, .remove = dw_pci_remove, + .driver = { + .pm = &dw_pci_dev_pm_ops, + }, }; module_pci_driver(dw_pci_driver); -- 1.7.4.4