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Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0022-clk-bcm2835-Mark-used-PLLs-and-dividers-CRITICAL.patch')
-rw-r--r--target/linux/bcm27xx/patches-4.19/950-0022-clk-bcm2835-Mark-used-PLLs-and-dividers-CRITICAL.patch28
1 files changed, 28 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0022-clk-bcm2835-Mark-used-PLLs-and-dividers-CRITICAL.patch b/target/linux/bcm27xx/patches-4.19/950-0022-clk-bcm2835-Mark-used-PLLs-and-dividers-CRITICAL.patch
new file mode 100644
index 0000000000..e4a1d7f660
--- /dev/null
+++ b/target/linux/bcm27xx/patches-4.19/950-0022-clk-bcm2835-Mark-used-PLLs-and-dividers-CRITICAL.patch
@@ -0,0 +1,28 @@
+From f1f199b682e258674137105f49d033cb81612ab7 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
+@@ -1362,6 +1362,11 @@ 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;
+