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Date:   Thu, 10 Jan 2019 18:42:00 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-bluetooth@...r.kernel.org, linux-media@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/14] Add support for FM radio in hcill and kill TI_ST

Hi,

On Sat, Dec 22, 2018 at 09:08:28PM +0100, Pavel Machek wrote:
> Merry Christmas!
> 
> > This moves all remaining users of the legacy TI_ST driver to hcill (patches
> > 1-3). Then patches 4-7 convert wl128x-radio driver to a standard platform
> > device driver with support for multiple instances. Patch 7 will result in
> > (userless) TI_ST driver no longer supporting radio at runtime. Patch 8-11 do
> > some cleanups in the wl128x-radio driver. Finally patch 12 removes the TI_ST
> > specific parts from wl128x-radio and adds the required infrastructure to use it
> > with the serdev hcill driver instead. The remaining patches 13 and 14 remove
> > the old TI_ST code.
> > 
> > The new code has been tested on the Motorola Droid 4. For testing the audio
> > should be configured to route Ext to Speaker or Headphone. Then you need to
> > plug headphone, since its cable is used as antenna. For testing there is a
> > 'radio' utility packages in Debian. When you start the utility you need to
> > specify a frequency, since initial get_frequency returns an error:
> > 
> > $ radio -f 100.0
> 
> Ok, it seems  the driver does not work built-in, due to firmware issue:
> 
> root@...uan:/home/user# dmesg | grep wl12
> [    1.018951] reg-fixed-voltage regulator-wl12xx: GPIO lookup for
> consumer (null)
> [    1.026550] reg-fixed-voltage regulator-wl12xx: using device tree
> for GPIO lookup
> [    1.034271] of_get_named_gpiod_flags: can't parse 'gpios' property
> of node '/regulator-wl12xx[0]'
> [    1.043487] of_get_named_gpiod_flags: parsed 'gpio' property of
> node '/regulator-wl12xx[0]' - status (0)
> [    4.151885] wl12xx_driver wl12xx.1.auto: Direct firmware load for
> ti-connectivity/wl128x-nvs.bin failed with error -2
> [   11.368286] vwl1271: disabling
> root@...uan:/home/user# find /lib/firmware/ | grep wl128
> /lib/firmware/ti-connectivity/wl128x-fw-5-plt.bin
> /lib/firmware/ti-connectivity/wl128x-fw-5-mr.bin
> /lib/firmware/ti-connectivity/wl128x-fw-5-sr.bin
> /lib/firmware/ti-connectivity/wl128x-nvs.bin
> root@...uan:/home/user#
>
> Ideas welcome... ... ... am I supposed to compile wl128-nvs.bin into
> the kernel using EXTRA_FIRMWARE?

This is due to the driver loading before the rootfs is available.
You can workaround this without touching your kernel configuration by
rebinding the driver via sysfs: https://lwn.net/Articles/143397/

-- Sebastian

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