From f89117c0f54c235c149d31174d1dd855e04765b8 Mon Sep 17 00:00:00 2001 From: Stanimir Varbanov Date: Mon, 11 Apr 2016 11:38:39 +0300 Subject: dmaengine: qcom: bam_dma: clear BAM interrupt only if it is raised Currently we write BAM_IRQ_CLR register with zero even when no BAM_IRQ occured. This write has some bad side effects when the BAM instance is for the crypto engine. In case of crypto engine some of the BAM registers are xPU protected and they cannot be controlled by the driver. Signed-off-by: Stanimir Varbanov Reviewed-by: Andy Gross Tested-by: Pramod Gurav Signed-off-by: Vinod Koul --- drivers/dma/qcom/bam_dma.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'drivers/dma/qcom') diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c index a486bc0f82e0..789d5f836bf7 100644 --- a/drivers/dma/qcom/bam_dma.c +++ b/drivers/dma/qcom/bam_dma.c @@ -801,13 +801,17 @@ static irqreturn_t bam_dma_irq(int irq, void *data) if (srcs & P_IRQ) tasklet_schedule(&bdev->task); - if (srcs & BAM_IRQ) + if (srcs & BAM_IRQ) { clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS)); - /* don't allow reorder of the various accesses to the BAM registers */ - mb(); + /* + * don't allow reorder of the various accesses to the BAM + * registers + */ + mb(); - writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR)); + writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR)); + } return IRQ_HANDLED; } -- cgit v1.2.1