package/kernel/qca-nss-dp/patches/0011-01-edma_v1-rework-hw_reset-logic-to-permit-rmmod-and-in.patch

   1 From c318c90b824c59539bf2e33618e381293398616c Mon Sep 17 00:00:00 2001
   2 From: Christian Marangi <ansuelsmth@gmail.com>
   3 Date: Tue, 16 Apr 2024 15:02:49 +0200
   4 Subject: [PATCH 1/6] edma_v1: rework hw_reset logic to permit rmmod and insmod
   5
   6 Rework hw_reset logic for edma v1 to permit rmmod and insmod by using
   7 get_exclusive_released variant (assuming the reset control was released)
   8 and manually acquire and release it.
   9
  10 This permits rmmod and insmod without triggering warning or receiving
  11 -EBUSY errors.
  12
  13 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
  14 ---
  15  hal/dp_ops/edma_dp/edma_v1/edma_cfg.c | 6 +++++-
  16  1 file changed, 5 insertions(+), 1 deletion(-)
  17
  18 --- a/hal/dp_ops/edma_dp/edma_v1/edma_cfg.c
  19 +++ b/hal/dp_ops/edma_dp/edma_v1/edma_cfg.c
  20 @@ -719,18 +719,22 @@ int edma_hw_reset(struct edma_hw *ehw)
  21         struct reset_control *rst;
  22         struct platform_device *pdev = ehw->pdev;
  23
  24 -       rst = devm_reset_control_get(&pdev->dev, EDMA_HW_RESET_ID);
  25 +       rst = devm_reset_control_get_exclusive_released(&pdev->dev, EDMA_HW_RESET_ID);
  26         if (IS_ERR(rst)) {
  27                 pr_warn("DTS Node: %s does not exist\n", EDMA_HW_RESET_ID);
  28                 return -EINVAL;
  29         }
  30
  31 +       reset_control_acquire(rst);
  32 +
  33         reset_control_assert(rst);
  34         udelay(100);
  35
  36         reset_control_deassert(rst);
  37         udelay(100);
  38
  39 +       reset_control_release(rst);
  40 +
  41         pr_info("EDMA HW Reset completed succesfully\n");
  42
  43         return 0;