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authorÁlvaro Fernández Rojas <noltari@gmail.com>2016-09-10 14:54:26 +0200
committerÁlvaro Fernández Rojas <noltari@gmail.com>2016-09-10 14:54:26 +0200
commit2b1c6b21b5e6c82ebb55d7fb7df90e60e88cbb14 (patch)
treeba6d48b4fec219d07110f5d55afc19bc309d2bdb /target/linux/brcm2708/patches-4.4/0346-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch
parentac08cb06f6734ebf73ed855cbc836c566f80eaca (diff)
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brcm2708: update linux 4.4 patches to latest version
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Also adds support for Raspberry Pi Compute Module 3 (untested). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0346-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0346-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch54
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0346-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch b/target/linux/brcm2708/patches-4.4/0346-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch
new file mode 100644
index 0000000000..60e4dd9e9f
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0346-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch
@@ -0,0 +1,54 @@
+From 832d2f1df231073ac72474743e3d3adbf0540030 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Mon, 9 May 2016 17:28:18 -0700
+Subject: [PATCH] clk: bcm2835: Mark GPIO clocks enabled at boot as critical.
+
+These divide off of PLLD_PER and are used for the ethernet and wifi
+PHYs source PLLs. Neither of them is currently represented by a phy
+device that would grab the clock for us.
+
+This keeps other drivers from killing the networking PHYs when they
+disable their own clocks and trigger PLLD_PER's refcount going to 0.
+
+v2: Skip marking as critical if they aren't on at boot.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/clk/bcm/clk-bcm2835.c | 13 ++++++++++++-
+ 1 file changed, 12 insertions(+), 1 deletion(-)
+
+--- a/drivers/clk/bcm/clk-bcm2835.c
++++ b/drivers/clk/bcm/clk-bcm2835.c
+@@ -1246,6 +1246,15 @@ static struct clk *bcm2835_register_cloc
+ init.name = data->name;
+ init.flags = data->flags | CLK_IGNORE_UNUSED;
+
++ /*
++ * Some GPIO clocks for ethernet/wifi PLLs are marked as
++ * critical (since some platforms use them), but if the
++ * firmware didn't have them turned on then they clearly
++ * aren't actually critical.
++ */
++ if ((cprman_read(cprman, data->ctl_reg) & CM_ENABLE) == 0)
++ init.flags &= ~CLK_IS_CRITICAL;
++
+ if (data->is_vpu_clock) {
+ init.ops = &bcm2835_vpu_clock_clk_ops;
+ } else {
+@@ -1720,13 +1729,15 @@ static const struct bcm2835_clk_desc clk
+ .div_reg = CM_GP1DIV,
+ .int_bits = 12,
+ .frac_bits = 12,
++ .flags = CLK_IS_CRITICAL,
+ .is_mash_clock = true),
+ [BCM2835_CLOCK_GP2] = REGISTER_PER_CLK(
+ .name = "gp2",
+ .ctl_reg = CM_GP2CTL,
+ .div_reg = CM_GP2DIV,
+ .int_bits = 12,
+- .frac_bits = 12),
++ .frac_bits = 12,
++ .flags = CLK_IS_CRITICAL),
+
+ /* HDMI state machine */
+ [BCM2835_CLOCK_HSM] = REGISTER_PER_CLK(