linux-kernel - [PATCH 3/5] clk: ingenic: Don't use CLK_SET_RATE

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Message-Id: <20200903015048.3091523-3-paul@crapouillou.net>
Date:   Thu,  3 Sep 2020 03:50:46 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     od@...c.me, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 3/5] clk: ingenic: Don't use CLK_SET_RATE_GATE for PLL

CLK_SET_RATE_GATE means that the clock must be gated when being
reclocked. This is not the case for the PLLs in Ingenic SoCs.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/clk/ingenic/cgu.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
index 6bb5dedf0252..521a40dfcb72 100644
--- a/drivers/clk/ingenic/cgu.c
+++ b/drivers/clk/ingenic/cgu.c
@@ -182,6 +182,7 @@ ingenic_pll_set_rate(struct clk_hw *hw, unsigned long req_rate,
 	const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
 	unsigned long rate, flags;
 	unsigned int m, n, od;
+	int ret = 0;
 	u32 ctl;
 
 	rate = ingenic_pll_calc(clk_info, req_rate, parent_rate,
@@ -203,9 +204,14 @@ ingenic_pll_set_rate(struct clk_hw *hw, unsigned long req_rate,
 	ctl |= pll_info->od_encoding[od - 1] << pll_info->od_shift;
 
 	writel(ctl, cgu->base + pll_info->reg);
+
+	/* If the PLL is enabled, verify that it's stable */
+	if (ctl & BIT(pll_info->enable_bit))
+		ret = ingenic_pll_check_stable(cgu, pll_info);
+
 	spin_unlock_irqrestore(&cgu->lock, flags);
 
-	return 0;
+	return ret;
 }
 
 static int ingenic_pll_enable(struct clk_hw *hw)
@@ -662,7 +668,6 @@ static int ingenic_register_clock(struct ingenic_cgu *cgu, unsigned idx)
 		}
 	} else if (caps & CGU_CLK_PLL) {
 		clk_init.ops = &ingenic_pll_ops;
-		clk_init.flags |= CLK_SET_RATE_GATE;
 
 		caps &= ~CGU_CLK_PLL;
 
-- 
2.28.0