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

From: Kenneth Westfield
Date: Wed Mar 11 2015 - 23:42:41 EST

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@xxxxxxxxxxxxxx>
> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxxxx>

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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