[v2,04/17] clk: imx: fracn-gppll: fix fractional part of PLL getting lost

Commit Message

Peng Fan (OSS) May 10, 2024, 9:18 a.m. UTC

From: Pengfei Li <[e-mail]>

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 <[e-mail]>
Reviewed-by: Jacky Bai <[e-mail]>
Signed-off-by: Peng Fan <[e-mail]>
---
 drivers/clk/imx/clk-fracn-gppll.c | 4 ++++
 1 file changed, 4 insertions(+)

Patch

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);