target/linux/layerscape/patches-5.4/701-net-0310-staging-fsl_ppfe-performance-tuning-for-user-space.patch

   1 From 31fa4aeafa41a38c76085af4de7192c572e85119 Mon Sep 17 00:00:00 2001
   2 From: Akhil Goyal <akhil.goyal@nxp.com>
   3 Date: Fri, 20 Jul 2018 16:43:25 +0530
   4 Subject: [PATCH] staging: fsl_ppfe: performance tuning for user space
   5
   6 interrupt coalescing of 100 usec is added.
   7
   8 Signed-off-by: Akhil Goyal <akhil.goyal@nxp.com>
   9 Signed-off-by: Sachin Saxena <sachin.saxena@nxp.com>
  10 ---
  11  drivers/staging/fsl_ppfe/pfe_cdev.c | 12 +++++++++---
  12  1 file changed, 9 insertions(+), 3 deletions(-)
  13
  14 --- a/drivers/staging/fsl_ppfe/pfe_cdev.c
  15 +++ b/drivers/staging/fsl_ppfe/pfe_cdev.c
  16 @@ -116,15 +116,18 @@ static irqreturn_t hif_us_isr(int irq, v
  17
  18         if (int_status & HIF_RXPKT_INT) {
  19                 int_enable_mask &= ~(HIF_RXPKT_INT);
  20 +               /* Disable interrupts, they will be enabled after
  21 +                * they are serviced
  22 +                */
  23 +               writel_relaxed(int_enable_mask, HIF_INT_ENABLE);
  24 +
  25                 eventfd_signal(trigger, 1);
  26         }
  27
  28 -       /*Disable interrupts, they will be enabled after they are serviced */
  29 -       writel_relaxed(int_enable_mask, HIF_INT_ENABLE);
  30 -
  31         return IRQ_HANDLED;
  32  }
  33
  34 +#define PFE_INTR_COAL_USECS    100
  35  static long pfe_cdev_ioctl(struct file *fp, unsigned int cmd,
  36                            unsigned long arg)
  37  {
  38 @@ -159,6 +162,9 @@ static long pfe_cdev_ioctl(struct file *
  39                         eventfd_ctx_put(g_trigger);
  40                         g_trigger = NULL;
  41                 }
  42 +               writel((PFE_INTR_COAL_USECS * (pfe->ctrl.sys_clk / 1000)) |
  43 +                       HIF_INT_COAL_ENABLE, HIF_INT_COAL);
  44 +
  45                 pr_debug("request_irq for hif interrupt: %d\n", pfe->hif_irq);
  46                 ret = 0;
  47                 break;