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

From a50ed3cb374d57704b9a4706608b98d8c0ba3eb9 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 13 Feb 2017 17:20:08 +0000
Subject: [PATCH] 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
@@ -1376,6 +1376,11 @@ 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;