linux-kernel - Re: [PATCH v2] clk: qcom: Properly change rates for ahbix clock

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Message-ID: <20150312034234.GA22530@kwestfie-linux.qualcomm.com>
Date:	Wed, 11 Mar 2015 20:42:34 -0700
From:	Kenneth Westfield <kwestfie@...eaurora.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Mike Turquette <mturquette@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Kenneth Westfield <kwestfie@...eaurora.org>
Subject: Re: [PATCH v2] clk: qcom: Properly change rates for ahbix clock

On Fri, Mar 06, 2015 at 03:41:53PM -0800, Stephen Boyd wrote:
> The ahbix clock can never be turned off in practice. To change the
> rates we need to switch the mux off the M/N counter to an always on
> source (XO), reprogram the M/N counter to get the rate we want and
> finally switch back to the M/N counter. Add a new ops structure
> for this type of clock so that we can set the rate properly.
> 
> Fixes: c99e515a92e9 "clk: qcom: Add IPQ806X LPASS clock controller (LCC) driver"
> Cc: Kenneth Westfield <kwestfie@...eaurora.org>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
> 
> Changes from v1:
>  * Handle the case where clock feeding M/N counter is off
> 
>  drivers/clk/qcom/clk-rcg.c     | 62 ++++++++++++++++++++++++++++++++++++++++++
>  drivers/clk/qcom/clk-rcg.h     |  1 +
>  drivers/clk/qcom/lcc-ipq806x.c |  5 ++--
>  3 files changed, 65 insertions(+), 3 deletions(-)

Verified I2S audio functionality on the Storm board; with and without
firmware audio enabled.

Tested-by: Kenneth Westfield <kwestfie@...eaurora.org>

-- 
Kenneth Westfield
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, 
a Linux Foundation Collaborative Project
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