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authorBernhard Kaindl <bk@fsfe.org>2006-09-06 14:58:30 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2006-12-07 21:28:13 +0100
commitf011bf085cd41ee40c2c8e530f801ac6cb6e00d0 (patch)
tree6170cf32d4ea038dc0b23f52b9387a758b30960b /drivers/ieee1394/ohci1394.c
parentf9edc4f5c1dd9fab5ceedd69e77d20e508e41e8d (diff)
ohci1394: steps to implement suspend/resume
I did a quick shot on what I described and the appended patch does the first thing needed for working suspend/resume in ohci1394 which is HW de- and re-initialisation. It works with suspend2disk on my Ricoh R5C552 IEEE 1394 Controller with the 2.6.17 kernel to the extent that if I call dvgrab --interactive after suspend2disk without unloading ohci1394, it does not lock up dvgrab with 100% CPU but properly connects to the camera, given that I first unplug and plug the camera after coming back from suspend. I guess that could be fixed by forcing a bus reset in the resume function. I cannot test suspend to RAM here at the moment and should follow the guidelines in Documentation/power/pci.txt also, so this is rather a quick report than a finished patch and there are some rough edges: However, with this patch, I have to unload at least some in-kernel users of ohci1394 like dv1394 or video1394 before suspending. Not doing that caused an Oops and a bad tasklet error, probably from not handling ISO tasklets during suspend/resume properly. Maybe these can be temporarily cleared or unregistered and re-registered for suspend/resume with help from the other layers or from the highlevel 1394 core, but I do not really know what these do. But this patch provides a useful base to start from and is already of much help for people which do not need dv1394 and video1394 or can unload them at least during suspend. I cannot test function with sbp2 at the moment, but raw1394 seems to work fine. Signed-off-by: Bernhard Kaindl <bk@fsfe.org> Update 1: merge with previous two ohci1394 suspend/resume patches Update 2: version for application on top of Linux 2.6.19-rc4 Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/ieee1394/ohci1394.c')
-rw-r--r--drivers/ieee1394/ohci1394.c92
1 files changed, 78 insertions, 14 deletions
diff --git a/drivers/ieee1394/ohci1394.c b/drivers/ieee1394/ohci1394.c
index eae97d8dcf03..b98b9934b92d 100644
--- a/drivers/ieee1394/ohci1394.c
+++ b/drivers/ieee1394/ohci1394.c
@@ -3531,6 +3531,9 @@ static void ohci1394_pci_remove(struct pci_dev *pdev)
#ifdef CONFIG_PM
static int ohci1394_pci_resume (struct pci_dev *pdev)
{
+ int err;
+ struct ti_ohci *ohci;
+
/* PowerMac resume code comes first */
#ifdef CONFIG_PPC_PMAC
if (machine_is(powermac)) {
@@ -3545,28 +3548,89 @@ static int ohci1394_pci_resume (struct pci_dev *pdev)
pci_set_power_state(pdev, PCI_D0);
pci_restore_state(pdev);
- return pci_enable_device(pdev);
+ err = pci_enable_device(pdev);
+ if (err)
+ return err;
+
+ ohci = pci_get_drvdata(pdev);
+ if (!ohci)
+ return -1; /* or which exit status to use? */
+
+ PRINT(KERN_DEBUG, "resume called");
+
+ /* The following lines are copied from ohci1394_pci_probe(): */
+
+ /* Start off with a soft reset, to clear everything to a sane
+ * state. */
+ ohci_soft_reset(ohci);
+
+ /* Now enable LPS, which we need in order to start accessing
+ * most of the registers. In fact, on some cards (ALI M5251),
+ * accessing registers in the SClk domain without LPS enabled
+ * will lock up the machine. Wait 50msec to make sure we have
+ * full link enabled. */
+ reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_LPS);
+
+ /* Disable and clear interrupts */
+ reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
+ reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
+
+ mdelay(50);
+
+ ohci_initialize(ohci);
+
+ return 0;
}
static int ohci1394_pci_suspend (struct pci_dev *pdev, pm_message_t state)
{
int err;
+ struct ti_ohci *ohci;
+
+ ohci = pci_get_drvdata(pdev);
+ if (!ohci)
+ return -1; /* Not sure if this is the correct return code */
+
+ PRINT(KERN_DEBUG, "suspend called");
+
+ /* clear the async DMA contexts and stop using the controller: */
+ hpsb_bus_reset(ohci->host);
+
+ /* The following calls are from ohci1394_pci_remove(): */
- printk(KERN_INFO "%s does not fully support suspend and resume yet\n",
- OHCI1394_DRIVER_NAME);
+ /* Clear out BUS Options */
+ reg_write(ohci, OHCI1394_ConfigROMhdr, 0);
+ reg_write(ohci, OHCI1394_BusOptions,
+ (reg_read(ohci, OHCI1394_BusOptions) & 0x0000f007) |
+ 0x00ff0000);
+
+ /* Clear interrupt registers */
+ reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
+ reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
+ reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 0xffffffff);
+ reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 0xffffffff);
+ reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 0xffffffff);
+ reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 0xffffffff);
+
+ /* Disable IRM Contender */
+ set_phy_reg(ohci, 4, ~0xc0 & get_phy_reg(ohci, 4));
+
+ /* Clear link control register */
+ reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
+
+ /* Let all other nodes know to ignore us */
+ ohci_devctl(ohci->host, RESET_BUS, LONG_RESET_NO_FORCE_ROOT);
+
+ /* This stops all DMA contexts, disables interrupts,
+ * and clears linkEnable and LPS: */
+ ohci_soft_reset(ohci);
err = pci_save_state(pdev);
- if (err) {
- printk(KERN_ERR "%s: pci_save_state failed with %d\n",
- OHCI1394_DRIVER_NAME, err);
- return err;
- }
+ if (err)
+ goto out;
err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
-#ifdef OHCI1394_DEBUG
if (err)
- printk(KERN_DEBUG "%s: pci_set_power_state failed with %d\n",
- OHCI1394_DRIVER_NAME, err);
-#endif /* OHCI1394_DEBUG */
+ goto out;
/* PowerMac suspend code comes last */
#ifdef CONFIG_PPC_PMAC
@@ -3579,8 +3643,8 @@ static int ohci1394_pci_suspend (struct pci_dev *pdev, pm_message_t state)
pmac_call_feature(PMAC_FTR_1394_ENABLE, of_node, 0, 0);
}
#endif /* CONFIG_PPC_PMAC */
-
- return 0;
+out:
+ return err;
}
#endif /* CONFIG_PM */