target/linux/bcm27xx/patches-5.15/950-0853-clk-Switch-from-__clk_determine_rate-to-clk_core_rou.patch

   1 From dc4310d9d45e72360b8fdf46d514b6d29c92e808 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Sat, 2 Apr 2022 13:52:55 +0200
   4 Subject: [PATCH] clk: Switch from __clk_determine_rate to
   5  clk_core_round_rate_nolock
   6
   7 clk_mux_determine_rate_flags() will call into __clk_determine_rate()
   8 with a clk_hw pointer, while it has access to the clk_core pointer
   9 already.
  10
  11 This leads to back and forth between clk_hw and clk_core, while
  12 __clk_determine_rate will only call clk_core_round_rate_nolock() with
  13 the clk_core pointer it retrieved from the clk_hw.
  14
  15 Let's simplify things a bit by calling into clk_core_round_rate_nolock
  16 directly.
  17
  18 Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
  19 Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
  20 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  21 ---
  22  drivers/clk/clk.c | 13 ++++++++++---
  23  1 file changed, 10 insertions(+), 3 deletions(-)
  24
  25 --- a/drivers/clk/clk.c
  26 +++ b/drivers/clk/clk.c
  27 @@ -542,6 +542,9 @@ static bool mux_is_better_rate(unsigned
  28         return now <= rate && now > best;
  29  }
  30
  31 +static int clk_core_round_rate_nolock(struct clk_core *core,
  32 +                                     struct clk_rate_request *req);
  33 +
  34  int clk_mux_determine_rate_flags(struct clk_hw *hw,
  35                                  struct clk_rate_request *req,
  36                                  unsigned long flags)
  37 @@ -555,8 +558,12 @@ int clk_mux_determine_rate_flags(struct
  38         if (core->flags & CLK_SET_RATE_NO_REPARENT) {
  39                 parent = core->parent;
  40                 if (core->flags & CLK_SET_RATE_PARENT) {
  41 -                       ret = __clk_determine_rate(parent ? parent->hw : NULL,
  42 -                                                  &parent_req);
  43 +                       if (!parent) {
  44 +                               req->rate = 0;
  45 +                               return 0;
  46 +                       }
  47 +
  48 +                       ret = clk_core_round_rate_nolock(parent, &parent_req);
  49                         if (ret)
  50                                 return ret;
  51
  52 @@ -579,7 +586,7 @@ int clk_mux_determine_rate_flags(struct
  53
  54                 if (core->flags & CLK_SET_RATE_PARENT) {
  55                         parent_req = *req;
  56 -                       ret = __clk_determine_rate(parent->hw, &parent_req);
  57 +                       ret = clk_core_round_rate_nolock(parent, &parent_req);
  58                         if (ret)
  59                                 continue;
  60                 } else {