linux-kernel - [PATCH 1/3] clk: at91: fix programmable clk irq handling

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Date:	Mon,  3 Feb 2014 12:25:28 +0100
From:	Boris BREZILLON <b.brezillon@...rkiz.com>
To:	Mike Turquette <mturquette@...aro.org>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Boris BREZILLON <b.brezillon@...rkiz.com>
Subject: [PATCH 1/3] clk: at91: fix programmable clk irq handling

The prog irq is a level irq reflecting the prog clk status. As a result the
irq line will stay high when the prog clk is ready and the system will
hang.
Disable the irq when it is handled to avoid this problem.

Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
---
 drivers/clk/at91/clk-programmable.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/at91/clk-programmable.c b/drivers/clk/at91/clk-programmable.c
index fd792b2..02f62a0 100644
--- a/drivers/clk/at91/clk-programmable.c
+++ b/drivers/clk/at91/clk-programmable.c
@@ -55,6 +55,7 @@ static irqreturn_t clk_programmable_irq_handler(int irq, void *dev_id)
 	struct clk_programmable *prog = (struct clk_programmable *)dev_id;
 
 	wake_up(&prog->wait);
+	disable_irq_nosync(prog->irq);
 
 	return IRQ_HANDLED;
 }
@@ -74,8 +75,10 @@ static int clk_programmable_prepare(struct clk_hw *hw)
 
 	pmc_write(pmc, AT91_PMC_PCKR(id), tmp);
 
-	while (!(pmc_read(pmc, AT91_PMC_SR) & mask))
+	while (!(pmc_read(pmc, AT91_PMC_SR) & mask)) {
+		enable_irq(prog->irq);
 		wait_event(prog->wait, pmc_read(pmc, AT91_PMC_SR) & mask);
+	}
 
 	return 0;
 }
-- 
1.7.9.5

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