From 31fa4aeafa41a38c76085af4de7192c572e85119 Mon Sep 17 00:00:00 2001 From: Akhil Goyal Date: Fri, 20 Jul 2018 16:43:25 +0530 Subject: [PATCH] staging: fsl_ppfe: performance tuning for user space interrupt coalescing of 100 usec is added. Signed-off-by: Akhil Goyal Signed-off-by: Sachin Saxena --- drivers/staging/fsl_ppfe/pfe_cdev.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) --- a/drivers/staging/fsl_ppfe/pfe_cdev.c +++ b/drivers/staging/fsl_ppfe/pfe_cdev.c @@ -116,15 +116,18 @@ static irqreturn_t hif_us_isr(int irq, v if (int_status & HIF_RXPKT_INT) { int_enable_mask &= ~(HIF_RXPKT_INT); + /* Disable interrupts, they will be enabled after + * they are serviced + */ + writel_relaxed(int_enable_mask, HIF_INT_ENABLE); + eventfd_signal(trigger, 1); } - /*Disable interrupts, they will be enabled after they are serviced */ - writel_relaxed(int_enable_mask, HIF_INT_ENABLE); - return IRQ_HANDLED; } +#define PFE_INTR_COAL_USECS 100 static long pfe_cdev_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) { @@ -159,6 +162,9 @@ static long pfe_cdev_ioctl(struct file * eventfd_ctx_put(g_trigger); g_trigger = NULL; } + writel((PFE_INTR_COAL_USECS * (pfe->ctrl.sys_clk / 1000)) | + HIF_INT_COAL_ENABLE, HIF_INT_COAL); + pr_debug("request_irq for hif interrupt: %d\n", pfe->hif_irq); ret = 0; break;