From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lucas Stach <l.stach@pengutronix.de>
Subject: Re: [PATCH 2/2] drm/msm/adreno: fix nvmem related link error
Date: Thu, 18 Jan 2018 11:15:18 +0100
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To: Rob Clark <robdclark@gmail.com>, Arnd Bergmann <arnd@arndb.de>
Cc: Linux Fbdev development list <linux-fbdev@vger.kernel.org>, Wolfram Sang <wsa@the-dreams.de>, David Airlie <airlied@linux.ie>, linux-arm-msm <linux-arm-msm@vger.kernel.org>, Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>, dri-devel <dri-devel@lists.freedesktop.org>, Bjorn Andersson <bjorn.andersson@linaro.org>, Srinivas Kandagatla <srinivas.kandagatla@linaro.org>, linux-i2c@vger.kernel.org, freedreno <freedreno@lists.freedesktop.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

Am Mittwoch, den 17.01.2018, 16:52 -0500 schrieb Rob Clark:
> On Mon, Jan 15, 2018 at 11:14 AM, Arnd Bergmann <arnd@arndb.de>
> wrote:
> > When NVMEM is configured as a loadable module, and adreno
> > is built-in, we get a link failure:
> > 
> > drivers/gpu/drm/msm/adreno/a5xx_gpu.o: In function `a5xx_gpu_init':
> > a5xx_gpu.c:(.text+0x15cc): undefined reference to `nvmem_cell_get'
> > a5xx_gpu.c:(.text+0x15da): undefined reference to `nvmem_cell_read'
> > a5xx_gpu.c:(.text+0x15e4): undefined reference to `nvmem_cell_put'
> > 
> > This adds a Kconfig dependency to enforce valid configurations,
> > when NVMEM is a loadable module, adreno now has to also be one.
> > The code seems to deal fine with nvmem being completely disabled,
> > it will just not set the right speed bin then, so we don't need
> > a hard dependency.
> > 
> > Fixes: f56d9df656c4 ("drm/msm/adreno: Read the speed bins for a5xx
> > targets")
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> 
> Arnd, beyond randconfig, I guess there are probably two real-world
> scenarios, both =m (distro) and both =y (android/oe/etc)..
> 
> Is there a kconfig way to say if nvmem=m then drm_msm must be =n or
> =m?

That's exactly what the below patch does.

Regards,
Lucas

> BR,
> -R
> 
> 
> > ---
> >  drivers/gpu/drm/msm/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/gpu/drm/msm/Kconfig
> > b/drivers/gpu/drm/msm/Kconfig
> > index 99d39b2aefa6..74fb1c816da9 100644
> > --- a/drivers/gpu/drm/msm/Kconfig
> > +++ b/drivers/gpu/drm/msm/Kconfig
> > @@ -4,6 +4,7 @@ config DRM_MSM
> >         depends on DRM
> >         depends on ARCH_QCOM || (ARM && COMPILE_TEST)
> >         depends on OF && COMMON_CLK
> > +       depends on NVMEM || !NVMEM
> >         depends on MMU
> >         select QCOM_MDT_LOADER if ARCH_QCOM
> >         select REGULATOR
> > --
> > 2.9.0
> > 
> 
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