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Message-Id: <1367914491-17445-1-git-send-email-marek.belisko@streamunlimited.com> Date: Tue, 7 May 2013 10:14:50 +0200 From: Marek Belisko <marek.belisko@...il.com> To: mturquette@...aro.org Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, daniel@...que.org, sebastian.hesselbarth@...il.com, Marek Belisko <marek.belisko@...eamunlimited.com> Subject: [PATCH 1/2] clk: si5351: Fix msynth_recalc_rate return value when fOUT is 0. When p3 is eual to 0 then result for fOUT is 0. In that case we should return 0 not parent_rate; This issue was causing deadlock in si5351 chip when user set_rate for ms0->clk0 and then set_rate for ms1->clk1 (both ms sourced from plla). After that clk1 was 0 and it wasn't possible to enable it again (try also manually with i2cset commands). Only power cycle helps. Signed-off-by: Marek Belisko <marek.belisko@...eamunlimited.com> --- drivers/clk/clk-si5351.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clk/clk-si5351.c b/drivers/clk/clk-si5351.c index fc215ce..a8fc0f4 100644 --- a/drivers/clk/clk-si5351.c +++ b/drivers/clk/clk-si5351.c @@ -607,7 +607,7 @@ static unsigned long si5351_msynth_recalc_rate(struct clk_hw *hw, si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params); if (hwdata->params.p3 == 0) - return parent_rate; + return 0; /* * multisync0-5: fOUT = (128 * P3 * fIN) / (P1*P3 + P2 + 512*P3) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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