releases/5.5.6/clk-meson-meson8b-make-the-ccf-use-the-glitch-free-m.patch

From a2aae75e567fc8d03729ed9fb3e8345c82b18707 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Thu, 26 Dec 2019 20:12:23 +0100
Subject: clk: meson: meson8b: make the CCF use the glitch-free mali mux

From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

[ Upstream commit 8daeaea99caabe24a0929fac17977ebfb882fa86 ]

The "mali_0" or "mali_1" clock trees should not be updated while the
clock is running. Enforce this by setting CLK_SET_RATE_GATE on the
"mali_0" and "mali_1" gates. This makes the CCF switch to the "mali_1"
tree when "mali_0" is currently active and vice versa, which is exactly
what the vendor driver does when updating the frequency of the mali
clock.

This fixes a potential hang when changing the GPU frequency at runtime.

Fixes: 74e1f2521f16ff ("clk: meson: meson8b: add the GPU clock tree")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/clk/meson/meson8b.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index 67e6691e080c1..8856ce476ccfa 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -1764,8 +1764,11 @@ static struct clk_regmap meson8b_hdmi_sys = {
 
 /*
  * The MALI IP is clocked by two identical clocks (mali_0 and mali_1)
- * muxed by a glitch-free switch on Meson8b and Meson8m2. Meson8 only
- * has mali_0 and no glitch-free mux.
+ * muxed by a glitch-free switch on Meson8b and Meson8m2. The CCF can
+ * actually manage this glitch-free mux because it does top-to-bottom
+ * updates the each clock tree and switches to the "inactive" one when
+ * CLK_SET_RATE_GATE is set.
+ * Meson8 only has mali_0 and no glitch-free mux.
  */
 static const struct clk_hw *meson8b_mali_0_1_parent_hws[] = {
 	&meson8b_xtal.hw,
@@ -1830,7 +1833,7 @@ static struct clk_regmap meson8b_mali_0 = {
 			&meson8b_mali_0_div.hw
 		},
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT,
+		.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -1885,7 +1888,7 @@ static struct clk_regmap meson8b_mali_1 = {
 			&meson8b_mali_1_div.hw
 		},
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT,
+		.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT,
 	},
 };
 
-- 
2.20.1