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From: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Date: Sat, 04 May 2024 08:48:57 +0800
Subject: [PATCH 04/18] clk: imx: fracn-gppll: fix fractional part of PLL
 getting lost
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Message-Id: <20240504-imx-clk-v1-4-f7915489d58d@nxp.com>
References: <20240504-imx-clk-v1-0-f7915489d58d@nxp.com>
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To: Abel Vesa <abelvesa@kernel.org>, 
 Michael Turquette <mturquette@baylibre.com>, 
 Stephen Boyd <sboyd@kernel.org>, Shawn Guo <shawnguo@kernel.org>, 
 Sascha Hauer <s.hauer@pengutronix.de>, 
 Pengutronix Kernel Team <kernel@pengutronix.de>, 
 Fabio Estevam <festevam@gmail.com>, Jacky Bai <ping.bai@nxp.com>, 
 Ye Li <ye.li@nxp.com>, Dong Aisheng <aisheng.dong@nxp.com>
Cc: linux-clk@vger.kernel.org, imx@lists.linux.dev, 
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, 
 Abel Vesa <abel.vesa@linaro.org>, Peng Fan <peng.fan@nxp.com>, 
 Pengfei Li <pengfei.li_1@nxp.com>
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From: Pengfei Li <pengfei.li_1@nxp.com>

Fractional part of PLL gets lost after re-enabling the PLL. the
MFN can NOT be automatically loaded when doing frac PLL enable/disable,
So when re-enable PLL, configure mfn explicitly.

Fixes: 1b26cb8a77a4 ("clk: imx: support fracn gppll")
Signed-off-by: Pengfei Li <pengfei.li_1@nxp.com>
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/clk/imx/clk-fracn-gppll.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/clk/imx/clk-fracn-gppll.c b/drivers/clk/imx/clk-fracn-gppll.c
index 44462ab50e51..1becba2b62d0 100644
--- a/drivers/clk/imx/clk-fracn-gppll.c
+++ b/drivers/clk/imx/clk-fracn-gppll.c
@@ -291,6 +291,10 @@ static int clk_fracn_gppll_prepare(struct clk_hw *hw)
 	if (val & POWERUP_MASK)
 		return 0;
 
+	if (pll->flags & CLK_FRACN_GPPLL_FRACN)
+		writel_relaxed(readl_relaxed(pll->base + PLL_NUMERATOR),
+			       pll->base + PLL_NUMERATOR);
+
 	val |= CLKMUX_BYPASS;
 	writel_relaxed(val, pll->base + PLL_CTRL);
 

-- 
2.37.1