linux-kernel - [PATCH] clk: sunxi-ng: ccu-sun4i-a10: Fix mali changing dclk frequency

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Message-Id: <1517354639-92978-1-git-send-email-giulio.benetti@micronovasrl.com>
Date:   Wed, 31 Jan 2018 00:23:59 +0100
From:   Giulio Benetti <giulio.benetti@...ronovasrl.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Giulio Benetti <giulio.benetti@...ronovasrl.com>
Subject: [PATCH] clk: sunxi-ng: ccu-sun4i-a10: Fix mali changing dclk frequency

When mali.ko is inserted, it set default clocks
and call all parent clocks to stay into range,
causing pll-video0 to change and subsequently
to change dclk to wrong frequencies.
"gpu" clock has lot of parent plls inside driver,
but on sun7i pll8-gpu does not depend on pll-video0,
pll-ve, pll-video1.
It only depends on 24Mhz main clock.

Remove all pll parents from gpu_parents_sun7i except "pll-gpu".

Signed-off-by: Giulio Benetti <giulio.benetti@...ronovasrl.com>
---
 drivers/clk/sunxi-ng/ccu-sun4i-a10.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun4i-a10.c b/drivers/clk/sunxi-ng/ccu-sun4i-a10.c
index ffa5dac..49726a6 100644
--- a/drivers/clk/sunxi-ng/ccu-sun4i-a10.c
+++ b/drivers/clk/sunxi-ng/ccu-sun4i-a10.c
@@ -790,9 +790,7 @@ static SUNXI_CCU_M_WITH_MUX_GATE(gpu_sun4i_clk, "gpu", gpu_parents_sun4i,
 				 0x154, 0, 4, 24, 2, BIT(31),
 				 CLK_SET_RATE_PARENT);
 
-static const char *const gpu_parents_sun7i[] = { "pll-video0", "pll-ve",
-						 "pll-ddr-other", "pll-video1",
-						 "pll-gpu" };
+static const char *const gpu_parents_sun7i[] = { "pll-gpu" };
 static const u8 gpu_table_sun7i[] = { 0, 1, 2, 3, 4 };
 static SUNXI_CCU_M_WITH_MUX_TABLE_GATE(gpu_sun7i_clk, "gpu",
 				       gpu_parents_sun7i, gpu_table_sun7i,
-- 
2.7.4