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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. Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -5837,6 +5837,21 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
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init_waitqueue_head(&hba->dev_cmd.tag_wq);
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ufshcd_init_clk_gating(hba);
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/*
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* In order to avoid any spurious interrupt immediately after
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* registering UFS controller interrupt handler, clear any pending UFS
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* interrupt status and disable all the UFS interrupts.
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*/
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ufshcd_writel(hba, ufshcd_readl(hba, REG_INTERRUPT_STATUS),
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REG_INTERRUPT_STATUS);
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ufshcd_writel(hba, 0, REG_INTERRUPT_ENABLE);
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/*
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* Make sure that UFS interrupts are disabled and any pending interrupt
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* status is cleared before registering UFS interrupt handler.
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*/
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mb();
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/* IRQ registration */
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err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
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if (err) {
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