openwrt/target/linux/brcm2708/patches-4.14/950-0026-clk-bcm2835-Mark-used-PLLs-and-dividers-CRITICAL.patch

From 39c54b332bfe3cb95221b663d38b5b620e47c912 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 13 Feb 2017 17:20:08 +0000
Subject: [PATCH 026/454] clk-bcm2835: Mark used PLLs and dividers CRITICAL

The VPU configures and relies on several PLLs and dividers. Mark all
enabled dividers and their PLLs as CRITICAL to prevent the kernel from
switching them off.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/clk/bcm/clk-bcm2835.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -1399,6 +1399,11 @@ bcm2835_register_pll_divider(struct bcm2
 	divider->div.hw.init = &init;
 	divider->div.table = NULL;
 
+	if (!(cprman_read(cprman, data->cm_reg) & data->hold_mask)) {
+		init.flags |= CLK_IS_CRITICAL;
+		divider->div.flags |= CLK_IS_CRITICAL;
+	}
+
 	divider->cprman = cprman;
 	divider->data = data;