From: u.kleine-koenig@pengutronix.de (Uwe Kleine-König)
To: linux-arm-kernel@lists.infradead.org
Subject: noise issues when recording sound on i.MX28
Date: Tue, 16 Feb 2016 20:35:35 +0100 [thread overview]
Message-ID: <20160216193535.GB32169@pengutronix.de> (raw)
In-Reply-To: <CAOMZO5BDjkWi+cQK1-J7ag8Z48tY1Uwofi4EkovN-drSC4_reA@mail.gmail.com>
Hello Fabio,
On Tue, Feb 16, 2016 at 01:01:19PM -0200, Fabio Estevam wrote:
> On Thu, Feb 11, 2016 at 6:40 AM, Uwe Kleine-K?nig
> <u.kleine-koenig@pengutronix.de> wrote:
>
> > root at hostname:/sys/kernel/debug/clk find -name saif?_sel
> > ./ref_xtal/pll0/saif0_sel
> > ./ref_xtal/pll0/saif1_sel
> >
> > root at hostname:/sys/kernel/debug/clk cat ./ref_xtal/pll0/saif?_sel/clk_rate
> > 480000000
> > 480000000
>
> Ok, what about the SAIF0 and SAIF1 sampling rates: are they always the same?
Lothar found a recipe to reproduce. I didn't try, but it's something
along the lines of (Lothar please correct if I'm wrong):
- start a recording on one SAIF
- start playback on the other SAIF
- using direct access to the registers stop and restart the playback
SAIF via the RUN bit.
The program I have doesn't provide a reliable reproduction recipe, it
runs in a loop and sometimes need several (>1000) iterations to trigger.
In my setup the sampling rates don't change. The values of
BITCLK_MULT_RATE differ however in my setup, I don't see why though.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-K?nig |
Industrial Linux Solutions | http://www.pengutronix.de/ |
next prev parent reply other threads:[~2016-02-16 19:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-27 10:56 noise issues when recording sound on i.MX28 Uwe Kleine-König
2016-01-27 11:53 ` Fabio Estevam
2016-01-27 14:43 ` Uwe Kleine-König
2016-01-28 6:38 ` Lothar Waßmann
2016-02-02 13:00 ` Fabio Estevam
2016-02-10 15:03 ` Uwe Kleine-König
2016-02-10 20:10 ` Fabio Estevam
2016-02-11 8:40 ` Uwe Kleine-König
2016-02-11 14:25 ` Lothar Waßmann
2016-02-16 15:01 ` Fabio Estevam
2016-02-16 19:35 ` Uwe Kleine-König [this message]
2016-02-17 7:55 ` Lothar Waßmann
2017-01-10 16:17 ` Jörg Krause
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