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mhi: pci_generic: Add suspend/resume/recovery procedure
Add support for system wide suspend/resume. During suspend, MHI device controller must be put in M3 state and PCI bus in D3 state. Add a recovery procedure allowing to reinitialize the device in case of error during resume steps, which can happen if device loses power (and so its context) while system suspend. Reviewed-by Hemant Kumar <hemantk@codeaurora.org> Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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1 changed files with 105 additions and 0 deletions
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@ -13,6 +13,7 @@
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#include <linux/mhi.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/workqueue.h>
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#define MHI_PCI_DEFAULT_BAR_NUM 0
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@ -186,6 +187,7 @@ enum mhi_pci_device_status {
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struct mhi_pci_device {
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struct mhi_controller mhi_cntrl;
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struct pci_saved_state *pci_state;
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struct work_struct recovery_work;
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unsigned long status;
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};
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@ -313,6 +315,50 @@ static void mhi_pci_runtime_put(struct mhi_controller *mhi_cntrl)
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/* no PM for now */
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}
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static void mhi_pci_recovery_work(struct work_struct *work)
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{
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struct mhi_pci_device *mhi_pdev = container_of(work, struct mhi_pci_device,
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recovery_work);
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struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
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struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev);
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int err;
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dev_warn(&pdev->dev, "device recovery started\n");
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/* Clean up MHI state */
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if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
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mhi_power_down(mhi_cntrl, false);
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mhi_unprepare_after_power_down(mhi_cntrl);
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}
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/* Check if we can recover without full reset */
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pci_set_power_state(pdev, PCI_D0);
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pci_load_saved_state(pdev, mhi_pdev->pci_state);
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pci_restore_state(pdev);
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if (!mhi_pci_is_alive(mhi_cntrl))
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goto err_try_reset;
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err = mhi_prepare_for_power_up(mhi_cntrl);
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if (err)
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goto err_try_reset;
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err = mhi_sync_power_up(mhi_cntrl);
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if (err)
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goto err_unprepare;
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dev_dbg(&pdev->dev, "Recovery completed\n");
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set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status);
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return;
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err_unprepare:
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mhi_unprepare_after_power_down(mhi_cntrl);
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err_try_reset:
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if (pci_reset_function(pdev))
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dev_err(&pdev->dev, "Recovery failed\n");
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}
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static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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const struct mhi_pci_dev_info *info = (struct mhi_pci_dev_info *) id->driver_data;
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@ -328,6 +374,8 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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if (!mhi_pdev)
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return -ENOMEM;
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INIT_WORK(&mhi_pdev->recovery_work, mhi_pci_recovery_work);
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mhi_cntrl_config = info->config;
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mhi_cntrl = &mhi_pdev->mhi_cntrl;
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@ -391,6 +439,8 @@ static void mhi_pci_remove(struct pci_dev *pdev)
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struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
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struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
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cancel_work_sync(&mhi_pdev->recovery_work);
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if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
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mhi_power_down(mhi_cntrl, true);
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mhi_unprepare_after_power_down(mhi_cntrl);
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@ -456,12 +506,67 @@ static const struct pci_error_handlers mhi_pci_err_handler = {
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.reset_done = mhi_pci_reset_done,
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};
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static int __maybe_unused mhi_pci_suspend(struct device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev);
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struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
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cancel_work_sync(&mhi_pdev->recovery_work);
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/* Transition to M3 state */
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mhi_pm_suspend(mhi_cntrl);
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pci_save_state(pdev);
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pci_disable_device(pdev);
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pci_wake_from_d3(pdev, true);
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pci_set_power_state(pdev, PCI_D3hot);
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return 0;
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}
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static int __maybe_unused mhi_pci_resume(struct device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev);
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struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
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int err;
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pci_set_power_state(pdev, PCI_D0);
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pci_restore_state(pdev);
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pci_set_master(pdev);
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err = pci_enable_device(pdev);
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if (err)
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goto err_recovery;
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/* Exit M3, transition to M0 state */
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err = mhi_pm_resume(mhi_cntrl);
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if (err) {
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dev_err(&pdev->dev, "failed to resume device: %d\n", err);
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goto err_recovery;
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}
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return 0;
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err_recovery:
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/* The device may have loose power or crashed, try recovering it */
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queue_work(system_long_wq, &mhi_pdev->recovery_work);
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return err;
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}
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static const struct dev_pm_ops mhi_pci_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(mhi_pci_suspend, mhi_pci_resume)
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};
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static struct pci_driver mhi_pci_driver = {
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.name = "mhi-pci-generic",
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.id_table = mhi_pci_id_table,
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.probe = mhi_pci_probe,
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.remove = mhi_pci_remove,
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.err_handler = &mhi_pci_err_handler,
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.driver.pm = &mhi_pci_pm_ops
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};
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module_pci_driver(mhi_pci_driver);
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