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Commit 256ee38b authored by Subhash Jadavani's avatar Subhash Jadavani
Browse files

scsi: ufs: avoid spurious UFS host controller interrupts 



When control reaches to Linux UFS driver during UFS boot mode, UFS host
controller interrupt status/enable registers may have left over settings.
In order to avoid any spurious interrupts due to these left overs, it's
important to clear these interrupt status/enable registers before enabling
UFS interrupt handling.

CRs-Fixed: 709250
Change-Id: Ibb554ca6e1bd2f69663a741f15948f80c52ce75c
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
parent a206d164

drivers/scsi/ufs/ufshcd.c

+15 −0
Original line number Diff line number Diff line
@@ -6637,6 +6637,21 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) 
	init_waitqueue_head(&hba->dev_cmd.tag_wq);



	ufshcd_init_clk_gating(hba);



	/*

	 * In order to avoid any spurious interrupt immediately after

	 * registering UFS controller interrupt handler, clear any pending UFS

	 * interrupt status and disable all the UFS interrupts.

	 */

	ufshcd_writel(hba, ufshcd_readl(hba, REG_INTERRUPT_STATUS),

		      REG_INTERRUPT_STATUS);

	ufshcd_writel(hba, 0, REG_INTERRUPT_ENABLE);

	/*

	 * Make sure that UFS interrupts are disabled and any pending interrupt

	 * status is cleared before registering UFS interrupt handler.

	 */

	mb();



	/* IRQ registration */

	err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);

	if (err) {