Commit 85009239 authored by Stephen M. Cameron's avatar Stephen M. Cameron Committed by James Bottomley
Browse files

[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: default avatarStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 702890e3

drivers/scsi/hpsa.c

+23 −9
Original line number Diff line number Diff line
@@ -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
@@ -3981,16 +3988,23 @@ 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. */

	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");

		rc = -ENOTSUPP; /* Not expected, but try soft reset later */

			/* Not expected, but try soft reset later */

			rc = -ENOTSUPP;

			goto unmap_cfgtable;

		}

	}

	rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_READY);

	if (rc) {

		dev_warn(&pdev->dev,

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