bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0440-clk-Always-clamp-the-rounded-rate.patch b/target/linux/bcm27xx/patches-5.15/950-0440-clk-Always-clamp-the-rounded-rate.patch
new file mode 100644
index 0000000000..6eb5c947ac
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0440-clk-Always-clamp-the-rounded-rate.patch
@@ -0,0 +1,28 @@
+From 5efe54b26d470785883bec0264d8d5e145715038 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Wed, 5 May 2021 15:35:34 +0200
+Subject: [PATCH] clk: Always clamp the rounded rate
+
+The current core while setting the min and max rate properly in the
+clk_request structure will not make sure that the requested rate is
+within these boundaries, leaving it to each and every driver to make
+sure it is.
+
+Add a clamp call to make sure it's always done.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/clk/clk.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/clk/clk.c
++++ b/drivers/clk/clk.c
+@@ -1347,6 +1347,8 @@ static int clk_core_determine_round_nolo
+ 	if (!core)
+ 		return 0;
+ 
++	req->rate = clamp(req->rate, req->min_rate, req->max_rate);
++
+ 	/*
+ 	 * At this point, core protection will be disabled
+ 	 * - if the provider is not protected at all