Messages in this thread Patch in this message | | | From | Martin Blumenstingl <> | Subject | [PATCH 1/1] clk: meson: meson8b: make the CCF use the glitch-free "mali" mux | Date | Sun, 15 Dec 2019 22:01:53 +0100 |
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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
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