diff options
| author | Stephen M. Cameron <scameron@beardog.cce.hp.com> | 2013-09-23 13:33:36 -0500 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-12-16 10:57:52 -0800 |
| commit | 85009239477a9b0b06d068d6ead9226d5c809a82 (patch) | |
| tree | fbf4f9297c6d14ab24017e4e68cee2ccecb1118e /drivers/scsi | |
| parent | 702890e3b910cd14c3d0ee3b4842d7e946e66b8d (diff) | |
[SCSI] hpsa: add 5 second delay after doorbell reset
The hardware guys tell us that after initiating a software
reset via the doorbell register we need to wait 5 seconds before
attempting to talk to the board *at all*. This means that we
cannot watch the board to verify it transitions from "ready" to
to "not ready" then back "ready", since this transition will
most likely happen during those 5 seconds (though we can still
verify the reset happens by watching the "driver version" field
get cleared.)
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/hpsa.c | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index c3db9bb1c235..2a71ab903d96 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -3785,6 +3785,13 @@ static int hpsa_controller_hard_reset(struct pci_dev *pdev, */ dev_info(&pdev->dev, "using doorbell to reset controller\n"); writel(use_doorbell, vaddr + SA5_DOORBELL); + + /* PMC hardware guys tell us we need a 5 second delay after + * doorbell reset and before any attempt to talk to the board + * at all to ensure that this actually works and doesn't fall + * over in some weird corner cases. + */ + msleep(5000); } else { /* Try to do it the PCI power state way */ /* Quoting from the Open CISS Specification: "The Power @@ -3981,15 +3988,22 @@ static int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev) need a little pause here */ msleep(HPSA_POST_RESET_PAUSE_MSECS); - /* Wait for board to become not ready, then ready. */ - dev_info(&pdev->dev, "Waiting for board to reset.\n"); - rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_NOT_READY); - if (rc) { - dev_warn(&pdev->dev, - "failed waiting for board to reset." - " Will try soft reset.\n"); - rc = -ENOTSUPP; /* Not expected, but try soft reset later */ - goto unmap_cfgtable; + if (!use_doorbell) { + /* Wait for board to become not ready, then ready. + * (if we used the doorbell, then we already waited 5 secs + * so the "not ready" state is already gone by so we + * won't catch it.) + */ + dev_info(&pdev->dev, "Waiting for board to reset.\n"); + rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_NOT_READY); + if (rc) { + dev_warn(&pdev->dev, + "failed waiting for board to reset." + " Will try soft reset.\n"); + /* Not expected, but try soft reset later */ + rc = -ENOTSUPP; + goto unmap_cfgtable; + } } rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_READY); if (rc) { |