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[SCSI] hpsa: add 5 second delay after doorbell reset

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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>
This commit is contained in:
Stephen M. Cameron 2013-09-23 13:33:36 -05:00 committed by James Bottomley
parent 702890e3b9
commit 8500923947
1 changed files with 23 additions and 9 deletions
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32
drivers/scsi/hpsa.c
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@ -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) {