linux-kernel - [PATCH 1/1] clk: meson: pll: fix rounding and setting a rate that matches precisely

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Date:   Sun, 24 Mar 2019 17:43:27 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     narmstrong@...libre.com, jbrunet@...libre.com,
        linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org
Cc:     mturquette@...libre.com, sboyd@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 1/1] clk: meson: pll: fix rounding and setting a rate that matches precisely

Make meson_clk_pll_is_better() consider a rate that precisely matches
the requested rate to be better than any previous rate (which was
smaller than the current).

Prior to commit 8eed1db1adec6a ("clk: meson: pll: update driver for the
g12a") meson_clk_get_pll_settings() returned early (before calling
meson_clk_pll_is_better()) if the rate from the current iteration
matches the requested rate precisely. After this commit
meson_clk_pll_is_better() is called unconditionally. This requires
meson_clk_pll_is_better() to work with the case where "now == rate".

This fixes a hang during boot on Meson8b / Odroid-C1 for me.

Fixes: 8eed1db1adec6a ("clk: meson: pll: update driver for the g12a")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/clk/meson/clk-pll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c
index 41e16dd7272a..7a14ac9b2fec 100644
--- a/drivers/clk/meson/clk-pll.c
+++ b/drivers/clk/meson/clk-pll.c
@@ -120,7 +120,7 @@ static bool meson_clk_pll_is_better(unsigned long rate,
 			return true;
 	} else {
 		/* Round down */
-		if (now < rate && best < now)
+		if (now <= rate && best < now)
 			return true;
 	}

-- 
2.21.0