target/linux/bcm27xx/patches-5.4/950-0020-clk-bcm2835-Mark-used-PLLs-and-dividers-CRITICAL.patch

   1 From a50ed3cb374d57704b9a4706608b98d8c0ba3eb9 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 13 Feb 2017 17:20:08 +0000
   4 Subject: [PATCH] clk-bcm2835: Mark used PLLs and dividers CRITICAL
   5
   6 The VPU configures and relies on several PLLs and dividers. Mark all
   7 enabled dividers and their PLLs as CRITICAL to prevent the kernel from
   8 switching them off.
   9
  10 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  11 ---
  12  drivers/clk/bcm/clk-bcm2835.c | 5 +++++
  13  1 file changed, 5 insertions(+)
  14
  15 --- a/drivers/clk/bcm/clk-bcm2835.c
  16 +++ b/drivers/clk/bcm/clk-bcm2835.c
  17 @@ -1379,6 +1379,11 @@ bcm2835_register_pll_divider(struct bcm2
  18         divider->div.hw.init = &init;
  19         divider->div.table = NULL;
  20
  21 +       if (!(cprman_read(cprman, data->cm_reg) & data->hold_mask)) {
  22 +               init.flags |= CLK_IS_CRITICAL;
  23 +               divider->div.flags |= CLK_IS_CRITICAL;
  24 +       }
  25 +
  26         divider->cprman = cprman;
  27         divider->data = data;
  28