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From: alexandre.belloni@free-electrons.com (Alexandre Belloni)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 5/5] clk: at91: sckc: optimize boot time
Date: Thu,  8 Sep 2016 16:51:46 +0200	[thread overview]
Message-ID: <20160908145146.20422-6-alexandre.belloni@free-electrons.com> (raw)
In-Reply-To: <20160908145146.20422-1-alexandre.belloni@free-electrons.com>

Assume that if the oscillator is enabled (OSC32EN bit is present), the
delay has already elapsed as the bootloader probably waited for the
oscillator to settle. This could waste up to 1.2s.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/clk/at91/sckc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index 04059ea761c2..d669f5ca4dac 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -69,7 +69,7 @@ static int clk_slow_osc_prepare(struct clk_hw *hw)
 	void __iomem *sckcr = osc->sckcr;
 	u32 tmp = readl(sckcr);
 
-	if (tmp & AT91_SCKC_OSC32BYP)
+	if (tmp & (AT91_SCKC_OSC32BYP | AT91_SCKC_OSC32EN))
 		return 0;
 
 	writel(tmp | AT91_SCKC_OSC32EN, sckcr);
-- 
2.9.3

  parent reply	other threads:[~2016-09-08 14:51 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-08 14:51 [PATCH v2 0/5] AT91: sckc improvements Alexandre Belloni
2016-09-08 14:51 ` [PATCH v2 1/5] clk: at91: move slow clock controller clocks to sckc.c Alexandre Belloni
2016-09-08 14:51 ` [PATCH v2 2/5] clk: at91: Add sama5d4 sckc support Alexandre Belloni
2016-09-09 10:52   ` Alexandre Belloni
2016-09-08 14:51 ` [PATCH v2 3/5] ARM: dts: at91: sama5d4: use proper sckc compatible Alexandre Belloni
2016-09-08 14:51 ` [PATCH v2 4/5] ARM: dts: at91: sama5d2: use correct " Alexandre Belloni
2016-09-08 14:51 ` Alexandre Belloni [this message]
2016-09-15  0:46 ` [PATCH v2 0/5] AT91: sckc improvements Stephen Boyd

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