Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
To:     sboyd@kernel.org
Cc:     mturquette@baylibre.com, matthias.bgg@gmail.com,
        angelogioacchino.delregno@collabora.com, wenst@chromium.org,
        miles.chen@mediatek.com, nfraprado@collabora.com,
        rex-bc.chen@mediatek.com, chun-jie.chen@mediatek.com,
        jose.exposito89@gmail.com, yangyingliang@huawei.com,
        msp@baylibre.com, linux-clk@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 02/10] clk: mediatek: mt8186-topckgen: Drop flags for main/univpll fixed factors
Date:   Mon, 24 Oct 2022 12:22:59 +0200
Message-Id: <20221024102307.33722-3-angelogioacchino.delregno@collabora.com>
In-Reply-To: <20221024102307.33722-1-angelogioacchino.delregno@collabora.com>
References: <20221024102307.33722-1-angelogioacchino.delregno@collabora.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The mainpll and univpll clocks are used as clock sources for multiple
peripherals of different kind, some of which are critical (like AXIs);
a rate change on any of these two will produce a rate change on many
devices and that's likely to produce system instability if not done
correctly: this is the reason why we have "fixed factor" clocks, used
by MUX clocks to provide different rates based on PLL output dividers.

Though, there's one fundamental issue that must be resolved somehow:

When performing GPU DVFS, we get a rate request that will try to change
the frequency of MAINPLL due to the CLK_TOP_MFG mux having clk26m,
mfgpll (the GPU dedicated PLL), mainpll_d3, mainpll_d5 (fixed factor
dividers) as possible parents.

In order to solve that, there are two ways:
 1. Add new "fake" mainpll_d3_fixed, mainpll_d5_fixed clocks, clones
    of mainpll_d3, mainpll_d5 clocks, for the only purpose of not
    declaring CLK_SET_RATE_PARENT; or
 2. Simply drop said flag from the original dividers.

After some careful validation, I cannot see anything calling a rate
change request during runtime for MAINPLL, nor for UNIVPLL (which would,
again, mean that we're reclocking lots of peripherals at once!), so it
is safe *and sane* to simply remove the CLK_SET_RATE_PARENT flag to all
of the main/univpll fixed factor divider clocks.

Besides, if for any (doubtful) reason main/univpll rate change will be
required in the future, it's still possible to call that on the PLL main
clocks, so we're still covered anyway.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/clk/mediatek/clk-mt8186-topckgen.c | 62 +++++++++++-----------
 1 file changed, 31 insertions(+), 31 deletions(-)

diff --git a/drivers/clk/mediatek/clk-mt8186-topckgen.c b/drivers/clk/mediatek/clk-mt8186-topckgen.c
index d7f2c4663c85..62b5ff4a5723 100644
--- a/drivers/clk/mediatek/clk-mt8186-topckgen.c
+++ b/drivers/clk/mediatek/clk-mt8186-topckgen.c
@@ -19,37 +19,37 @@ static const struct mtk_fixed_clk top_fixed_clks[] = {
 };
 
 static const struct mtk_fixed_factor top_divs[] = {
-	FACTOR(CLK_TOP_MAINPLL_D2, "mainpll_d2", "mainpll", 1, 2),
-	FACTOR(CLK_TOP_MAINPLL_D2_D2, "mainpll_d2_d2", "mainpll_d2", 1, 2),
-	FACTOR(CLK_TOP_MAINPLL_D2_D4, "mainpll_d2_d4", "mainpll_d2", 1, 4),
-	FACTOR(CLK_TOP_MAINPLL_D2_D16, "mainpll_d2_d16", "mainpll_d2", 1, 16),
-	FACTOR(CLK_TOP_MAINPLL_D3, "mainpll_d3", "mainpll", 1, 3),
-	FACTOR(CLK_TOP_MAINPLL_D3_D2, "mainpll_d3_d2", "mainpll_d3", 1, 2),
-	FACTOR(CLK_TOP_MAINPLL_D3_D4, "mainpll_d3_d4", "mainpll_d3", 1, 4),
-	FACTOR(CLK_TOP_MAINPLL_D5, "mainpll_d5", "mainpll", 1, 5),
-	FACTOR(CLK_TOP_MAINPLL_D5_D2, "mainpll_d5_d2", "mainpll_d5", 1, 2),
-	FACTOR(CLK_TOP_MAINPLL_D5_D4, "mainpll_d5_d4", "mainpll_d5", 1, 4),
-	FACTOR(CLK_TOP_MAINPLL_D7, "mainpll_d7", "mainpll", 1, 7),
-	FACTOR(CLK_TOP_MAINPLL_D7_D2, "mainpll_d7_d2", "mainpll_d7", 1, 2),
-	FACTOR(CLK_TOP_MAINPLL_D7_D4, "mainpll_d7_d4", "mainpll_d7", 1, 4),
-	FACTOR(CLK_TOP_UNIVPLL, "univpll", "univ2pll", 1, 2),
-	FACTOR(CLK_TOP_UNIVPLL_D2, "univpll_d2", "univpll", 1, 2),
-	FACTOR(CLK_TOP_UNIVPLL_D2_D2, "univpll_d2_d2", "univpll_d2", 1, 2),
-	FACTOR(CLK_TOP_UNIVPLL_D2_D4, "univpll_d2_d4", "univpll_d2", 1, 4),
-	FACTOR(CLK_TOP_UNIVPLL_D3, "univpll_d3", "univpll", 1, 3),
-	FACTOR(CLK_TOP_UNIVPLL_D3_D2, "univpll_d3_d2", "univpll_d3", 1, 2),
-	FACTOR(CLK_TOP_UNIVPLL_D3_D4, "univpll_d3_d4", "univpll_d3", 1, 4),
-	FACTOR(CLK_TOP_UNIVPLL_D3_D8, "univpll_d3_d8", "univpll_d3", 1, 8),
-	FACTOR(CLK_TOP_UNIVPLL_D3_D32, "univpll_d3_d32", "univpll_d3", 1, 32),
-	FACTOR(CLK_TOP_UNIVPLL_D5, "univpll_d5", "univpll", 1, 5),
-	FACTOR(CLK_TOP_UNIVPLL_D5_D2, "univpll_d5_d2", "univpll_d5", 1, 2),
-	FACTOR(CLK_TOP_UNIVPLL_D5_D4, "univpll_d5_d4", "univpll_d5", 1, 4),
-	FACTOR(CLK_TOP_UNIVPLL_D7, "univpll_d7", "univpll", 1, 7),
-	FACTOR(CLK_TOP_UNIVPLL_192M, "univpll_192m", "univ2pll", 1, 13),
-	FACTOR(CLK_TOP_UNIVPLL_192M_D4, "univpll_192m_d4", "univpll_192m", 1, 4),
-	FACTOR(CLK_TOP_UNIVPLL_192M_D8, "univpll_192m_d8", "univpll_192m", 1, 8),
-	FACTOR(CLK_TOP_UNIVPLL_192M_D16, "univpll_192m_d16", "univpll_192m", 1, 16),
-	FACTOR(CLK_TOP_UNIVPLL_192M_D32, "univpll_192m_d32", "univpll_192m", 1, 32),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D2, "mainpll_d2", "mainpll", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D2_D2, "mainpll_d2_d2", "mainpll_d2", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D2_D4, "mainpll_d2_d4", "mainpll_d2", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D2_D16, "mainpll_d2_d16", "mainpll_d2", 1, 16, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D3, "mainpll_d3", "mainpll", 1, 3, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D3_D2, "mainpll_d3_d2", "mainpll_d3", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D3_D4, "mainpll_d3_d4", "mainpll_d3", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D5, "mainpll_d5", "mainpll", 1, 5, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D5_D2, "mainpll_d5_d2", "mainpll_d5", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D5_D4, "mainpll_d5_d4", "mainpll_d5", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D7, "mainpll_d7", "mainpll", 1, 7, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D7_D2, "mainpll_d7_d2", "mainpll_d7", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_MAINPLL_D7_D4, "mainpll_d7_d4", "mainpll_d7", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL, "univpll", "univ2pll", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D2, "univpll_d2", "univpll", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D2_D2, "univpll_d2_d2", "univpll_d2", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D2_D4, "univpll_d2_d4", "univpll_d2", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D3, "univpll_d3", "univpll", 1, 3, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D3_D2, "univpll_d3_d2", "univpll_d3", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D3_D4, "univpll_d3_d4", "univpll_d3", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D3_D8, "univpll_d3_d8", "univpll_d3", 1, 8, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D3_D32, "univpll_d3_d32", "univpll_d3", 1, 32, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D5, "univpll_d5", "univpll", 1, 5, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D5_D2, "univpll_d5_d2", "univpll_d5", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D5_D4, "univpll_d5_d4", "univpll_d5", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D7, "univpll_d7", "univpll", 1, 7, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_192M, "univpll_192m", "univ2pll", 1, 13, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_192M_D4, "univpll_192m_d4", "univpll_192m", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_192M_D8, "univpll_192m_d8", "univpll_192m", 1, 8, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_192M_D16, "univpll_192m_d16", "univpll_192m", 1, 16, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_192M_D32, "univpll_192m_d32", "univpll_192m", 1, 32, 0),
 	FACTOR(CLK_TOP_APLL1_D2, "apll1_d2", "apll1", 1, 2),
 	FACTOR(CLK_TOP_APLL1_D4, "apll1_d4", "apll1", 1, 4),
 	FACTOR(CLK_TOP_APLL1_D8, "apll1_d8", "apll1", 1, 8),
-- 
2.37.2