From 2c1a5dae2fb127729773685e3cd1e48934edf1f2 Mon Sep 17 00:00:00 2001
From: Luke Hinds <7058938+lukehinds@users.noreply.github.com>
Date: Wed, 22 Jan 2020 16:03:00 +0000
Subject: [PATCH] Initialise rpi-firmware before clk-bcm2835

The IMA (Integrity Measurement Architecture) looks for a TPM (Trusted
Platform Module) having been registered when it initialises; otherwise
it assumes there is no TPM. It has been observed on BCM2835 that IMA
is initialised before TPM, and that initialising the BCM2835 clock
driver before the firmware driver has the effect of reversing this
order.

Change the firmware driver to initialise at core_initcall, delaying the
BCM2835 clock driver to postcore_initcall.

See: https://github.com/raspberrypi/linux/issues/3291
     https://github.com/raspberrypi/linux/pull/3297

Signed-off-by: Luke Hinds <lhinds@redhat.com>
Co-authored-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/clk/bcm/clk-bcm2835.c  | 2 +-
 drivers/firmware/raspberrypi.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -2401,7 +2401,7 @@ static int __init __bcm2835_clk_driver_i
 {
 	return platform_driver_register(&bcm2835_clk_driver);
 }
-core_initcall(__bcm2835_clk_driver_init);
+postcore_initcall(__bcm2835_clk_driver_init);
 
 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
 MODULE_DESCRIPTION("BCM2835 clock driver");
--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -416,7 +416,7 @@ out2:
 out1:
 	return ret;
 }
-subsys_initcall(rpi_firmware_init);
+core_initcall(rpi_firmware_init);
 
 static void __init rpi_firmware_exit(void)
 {
