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Message-ID: <001b01d163fd$bfb15280$3f13f780$@codeaurora.org>
Date: Wed, 10 Feb 2016 17:52:37 +0530
From: "Sricharan" <sricharan@...eaurora.org>
To: "'Michael Welling'" <mwelling@...e.org>
Cc: "'Wolfram Sang'" <wsa@...-dreams.de>,
"'Daniel Baluta'" <daniel.baluta@...el.com>,
"'Jonathan Cameron'" <jic23@...nel.org>,
"'Hartmut Knaack'" <knaack.h@....de>,
"'Lars-Peter Clausen'" <lars@...afoo.de>,
"'Peter Meerwald-Stadler'" <pmeerw@...erw.net>,
"'Linux Kernel Mailing List'" <linux-kernel@...r.kernel.org>,
<linux-iio@...r.kernel.org>,
"'Lucas De Marchi'" <lucas.demarchi@...el.com>,
"'Andy Gross'" <agross@...eaurora.org>,
"'Pramod Gurav'" <pramod.gurav@...rtplayin.com>,
"'Bjorn Andersson'" <bjorn.andersson@...ymobile.com>,
"'Guenter Roeck'" <linux@...ck-us.net>, <eibach@...ys.de>,
<linux-arm-msm@...r.kernel.org>
Subject: RE: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support
Hi,
> -----Original Message-----
> From: linux-arm-msm-owner@...r.kernel.org [mailto:linux-arm-msm-
> owner@...r.kernel.org] On Behalf Of Michael Welling
> Sent: Tuesday, February 09, 2016 12:47 AM
> To: Sricharan
> Cc: 'Wolfram Sang'; 'Daniel Baluta'; 'Jonathan Cameron'; 'Hartmut Knaack';
> 'Lars-Peter Clausen'; 'Peter Meerwald-Stadler'; 'Linux Kernel Mailing
List';
> linux-iio@...r.kernel.org; 'Lucas De Marchi'; 'Andy Gross'; 'Pramod
Gurav';
> 'Bjorn Andersson'; 'Guenter Roeck'; eibach@...ys.de; linux-arm-
> msm@...r.kernel.org
> Subject: Re: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support
>
> On Tue, Feb 09, 2016 at 12:41:35AM +0530, Sricharan wrote:
> > Hi,
> >
> > > -----Original Message-----
> > > From: Michael Welling [mailto:mwelling79@...il.com] On Behalf Of
> > > Michael Welling
> > > Sent: Monday, February 08, 2016 10:07 PM
> > > To: Wolfram Sang
> > > Cc: Daniel Baluta; Jonathan Cameron; Hartmut Knaack; Lars-Peter
> > > Clausen; Peter Meerwald-Stadler; Linux Kernel Mailing List;
> > linux-iio@...r.kernel.org;
> > > Lucas De Marchi; Andy Gross; Pramod Gurav; Bjorn Andersson; Guenter
> > > Roeck; eibach@...ys.de; Sricharan R; linux-arm-msm@...r.kernel.org
> > > Subject: Re: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support
> > >
> > > On Mon, Feb 08, 2016 at 11:25:00AM +0100, Wolfram Sang wrote:
> > > > On Fri, Feb 05, 2016 at 06:32:45PM -0600, Michael Welling wrote:
> > > > > On Fri, Feb 05, 2016 at 09:32:34PM +0200, Daniel Baluta wrote:
> > > > > > >> +static int ads1015_read_raw(struct iio_dev *indio_dev,
> > > > > > >> + struct iio_chan_spec const *chan,
> > > > > > >> +int
> > *val,
> > > > > > >> + int *val2, long mask) {
> > > > > > >> + int ret, idx;
> > > > > > >> + struct ads1015_data *data = iio_priv(indio_dev);
> > > > > > >> +
> > > > > > >> + mutex_lock(&data->lock);
> > > > > > >> + switch (mask) {
> > > > > > >> + case IIO_CHAN_INFO_RAW:
> > > > > > >> + if (iio_buffer_enabled(indio_dev)) {
> > > > > > >> + ret = -EBUSY;
> > > > > > >> + break;
> > > > > > >> + }
> > > > > > >> +
> > > > > > >> + ret = ads1015_set_power_state(data, true);
> > > > > > >> + if (ret < 0)
> > > > > > >> + break;
> > > > > > >
> > > > > > > Just tested the driver on a Dragonboard 410C with a robotics
> > > > > > > mezzanine that I designed.
> > > > > > >
> > > > > > > The above ads1015_set_power_state(data, true) is always
> > > > > > > returning
> > -
> > > EINVAL.
> > > > > > >
> > > > > > > Any ideas why that would be happening?
> > > > > > > I think it may be the return from pm_runtime_get_sync?
> > > > > >
> > > > > > Can you confirm that pm_runtime_get_sync fails? Using some
> printk?
> > > > > >
> > > > > > Also adding printks in suspend/resume function would be helpful.
> > > > > > Do you have CONFIG_PM enabled?
> > > > > >
> > > > >
> > > > > Indeed it is the pm_runtime_get_sync that fails with a -EINVAL.
> > > > >
> > > > > > >
> > > > > > > When I comment out the break the readings come back but are
> > > > > > > not
> > > updated continually.
> > > > > > > If I read in_voltage0-voltage1_raw then in_voltage0_raw the
> > > > > > > value
> > is
> > > updated.
> > > > > >
> > > > > > I guess this is normal if set_power_state fails.
> > > > >
> > > > > The hwmod driver works fine BTW.
> > > > >
> > > > > My guess is there is an issue with the qup i2c driver seeing as
> > > > > it has worked on other system without issue.
> > > > >
> > > > > CC'd some the latest developer on the qup i2c driver.
> > > > >
> > > > > I2C guys have any ideas on this?
> > > > >
> > > >
> > > > Adding some more people who recently worked on this. Might be nice
> > > > to know which kernel version you are using.
> > > >
> > Which i2c bus is this connected to ? I can give a try with 410c to
> > see why pm_runtime_get_sync from qup fails.
>
> It is on the lowspeed header. Here is my devicetree entry:
>
> i2c@...6000 {
> /* On Low speed expansion */
> label = "LS-I2C0";
> status = "okay";
>
> pca: pca@40 {
> compatible = "nxp,pca9685-pwm";
> #pwm-cells = <2>;
> reg = <0x40>;
> };
>
> adc: adc@48 {
> compatible = "ti,ads1015";
> reg = <0x48>;
> };
> };
Whats the sequence in which the failure happens ?
I tested on DB410c by adding the DT entry that you mentioned above on
4.5-rc2 and rc3.
I see that the i2c transfers call from pca9685 during pca9685_pwm_probe
did
go through and no failure from pm_runtime_get_sync
Regards,
Sricharan
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