lkml.org 
[lkml]   [2019]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/1] clk: meson: meson8b: make the CCF use the glitch-free "mali" mux
Date
The Mali clock tree 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>
---
drivers/clk/meson/meson8b.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index 3408297bff65..6b13084eebf5 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -1838,7 +1838,7 @@ 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,
},
};

@@ -1893,7 +1893,7 @@ 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,
},
};

--
2.24.1
\
 
 \ /
  Last update: 2019-12-15 22:03    [W:0.044 / U:0.512 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site