Thread (10 messages) 10 messages, 2 authors, 2016-09-21
STALE3555d
Revisions (3)
  1. v1 [diff vs current]
  2. v2 [diff vs current]
  3. v3 current

[PATCH v3 3/5] clk: at91: sckc: optimize boot time

From: Alexandre Belloni <hidden>
Date: 2016-09-20 20:59:58
Also in: linux-clk, lkml
Subsystem: common clk framework, the rest · Maintainers: Michael Turquette, Stephen Boyd, Linus Torvalds

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 <redacted>
---
 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 60d8225715a2..b1265f2cdae7 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
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