linux-kernel - [PATCH 2/3] clk: sunxi-ng: a64: keep rate of pll-mipi stable across parent rate changes

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Message-Id: <20230825-pll-mipi_keep_rate-v1-2-35bc43570730@oltmanns.dev>
Date:   Fri, 25 Aug 2023 07:36:38 +0200
From:   Frank Oltmanns <frank@...manns.dev>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Ondrej Jirman <x@...x.eu>,
        Icenowy Zheng <uwu@...nowy.me>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        dri-devel@...ts.freedesktop.org,
        Frank Oltmanns <frank@...manns.dev>
Subject: [PATCH 2/3] clk: sunxi-ng: a64: keep rate of pll-mipi stable
 across parent rate changes

Keep the clock rate of Allwinner A64's pll-mipi even when the parent
(pll-video0) changes its rate. This is required, to drive both an LCD
and HDMI display, because both have pll-video0 as an ancestor.

Signed-off-by: Frank Oltmanns <frank@...manns.dev>
---
 drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
index 8951ffc14ff5..d22094ce1d66 100644
--- a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
+++ b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
@@ -180,7 +180,8 @@ static struct ccu_nkm pll_mipi_clk = {
 		.reg		= 0x040,
 		.hw.init	= CLK_HW_INIT("pll-mipi", "pll-video0",
 					      &ccu_nkm_ops,
-					      CLK_SET_RATE_UNGATE | CLK_SET_RATE_PARENT),
+					      CLK_SET_RATE_UNGATE | CLK_SET_RATE_PARENT |
+					      CLK_KEEP_RATE),
 		.features	= CCU_FEATURE_CLOSEST_RATE,
 	},
 };

-- 
2.41.0