From 9a8c3cd8a0bbfd04bce15c41ad01e425c9e8d844 Mon Sep 17 00:00:00 2001 From: Bingbu Cao Date: Tue, 23 Dec 2025 15:23:00 +0800 Subject: [PATCH] media: staging/ipu7: Ignore interrupts when device is suspended [ Upstream commit 9ad65684b9285c5d66fb417d50e91a25ef8c994d ] IPU7 devices have shared interrupts with others. In some case when IPU7 device is suspended, driver get unexpected interrupt and invalid irq status 0xffffffff from ISR_STATUS and PB LOCAL_STATUS registers as interrupt is triggered from other device on shared irq line. In order to avoid this issue use pm_runtime_get_if_active() to check if IPU7 device is resumed, ignore the invalid irq status and use synchronize_irq() in suspend. Cc: Stable@vger.kernel.org Fixes: b7fe4c0019b1 ("media: staging/ipu7: add Intel IPU7 PCI device driver") Signed-off-by: Bingbu Cao Signed-off-by: Sakari Ailus Signed-off-by: Hans Verkuil Signed-off-by: Sasha Levin --- drivers/staging/media/ipu7/ipu7-buttress.c | 17 ++++++++++++++++- drivers/staging/media/ipu7/ipu7.c | 4 ++++ 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/staging/media/ipu7/ipu7-buttress.c b/drivers/staging/media/ipu7/ipu7-buttress.c index e5707f5e300b..40c6c8473357 100644 --- a/drivers/staging/media/ipu7/ipu7-buttress.c +++ b/drivers/staging/media/ipu7/ipu7-buttress.c @@ -342,14 +342,23 @@ irqreturn_t ipu_buttress_isr(int irq, void *isp_ptr) u32 disable_irqs = 0; u32 irq_status; unsigned int i; + int active; - pm_runtime_get_noresume(dev); + active = pm_runtime_get_if_active(dev); + if (active <= 0) + return IRQ_NONE; pb_irq = readl(isp->pb_base + INTERRUPT_STATUS); writel(pb_irq, isp->pb_base + INTERRUPT_STATUS); /* check btrs ATS, CFI and IMR errors, BIT(0) is unused for IPU */ pb_local_irq = readl(isp->pb_base + BTRS_LOCAL_INTERRUPT_MASK); + if (pb_local_irq == 0xffffffff) { + dev_warn_once(dev, "invalid PB irq status\n"); + pm_runtime_put_noidle(dev); + return IRQ_NONE; + } + if (pb_local_irq & ~BIT(0)) { dev_warn(dev, "PB interrupt status 0x%x local 0x%x\n", pb_irq, pb_local_irq); @@ -370,6 +379,12 @@ irqreturn_t ipu_buttress_isr(int irq, void *isp_ptr) return IRQ_NONE; } + if (irq_status == 0xffffffff) { + dev_warn_once(dev, "invalid irq status 0x%08x\n", irq_status); + pm_runtime_put_noidle(dev); + return IRQ_NONE; + } + do { writel(irq_status, isp->base + BUTTRESS_REG_IRQ_CLEAR); diff --git a/drivers/staging/media/ipu7/ipu7.c b/drivers/staging/media/ipu7/ipu7.c index 5cddc09c72bf..6c8c3eea44ac 100644 --- a/drivers/staging/media/ipu7/ipu7.c +++ b/drivers/staging/media/ipu7/ipu7.c @@ -2684,6 +2684,10 @@ static void ipu7_pci_reset_done(struct pci_dev *pdev) */ static int ipu7_suspend(struct device *dev) { + struct pci_dev *pdev = to_pci_dev(dev); + + synchronize_irq(pdev->irq); + return 0; }