linux-kernel - Re: [PATCH v2] of: Fix of platform build on powerpc due to bad of disaply code

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Message-ID: <20230119124232.5879410d@yea>
Date:   Thu, 19 Jan 2023 12:42:32 +0100
From:   "Erhard F." <erhard_f@...lbox.org>
To:     Michal Suchanek <msuchanek@...e.de>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>, linuxppc-dev@...ts.ozlabs.org,
        Javier Martinez Canillas <javierm@...hat.com>,
        open list <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH v2] of: Fix of platform build on powerpc due to bad of
 disaply code

On Thu, 19 Jan 2023 10:53:23 +0100
Michal Suchanek <msuchanek@...e.de> wrote:

> The commit 2d681d6a23a1 ("of: Make of framebuffer devices unique")
> breaks build because of wrong argument to snprintf. That certainly
> avoids the runtime error but is not the intended outcome.
> 
> Also use standard device name format of-display.N for all created
> devices.
> 
> Fixes: 2d681d6a23a1 ("of: Make of framebuffer devices unique")
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>
> ---
> v2: Update the device name format

Hi Michal!

Just tested your 'of: Make of framebuffer devices unique' + 'v2 of: Fix of platform build on powerpc due to bad of disaply code' on my G4 and can confirm they fix the original issue (https://bugzilla.kernel.org/show_bug.cgi?id=216095). Thanks!

Also ofdrm gets loaded now without error messages:
 # modprobe -v ofdrm
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/video/fbdev/core/cfbcopyarea.ko 
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/video/fbdev/core/sysimgblt.ko 
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/video/fbdev/core/sysfillrect.ko 
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/video/fbdev/core/cfbimgblt.ko 
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/video/fbdev/core/syscopyarea.ko 
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/video/fbdev/core/cfbfillrect.ko 
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/gpu/drm/drm_kms_helper.ko 
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/gpu/drm/drm_shmem_helper.ko 
insmod /lib/modules/6.2.0-rc4-PMacG4+/kernel/drivers/gpu/drm/tiny/ofdrm.ko 

However I get no monitor output yet, despite ofdrm is loaded:
 # lsmod | grep -i drm
ofdrm                   9736  0
drm_shmem_helper        5704  1 ofdrm
drm_kms_helper        101736  1 ofdrm
cfbfillrect             2896  1 drm_kms_helper
syscopyarea             2400  1 drm_kms_helper
cfbimgblt               2256  1 drm_kms_helper
sysfillrect             2920  1 drm_kms_helper
sysimgblt               2296  1 drm_kms_helper
cfbcopyarea             2376  1 drm_kms_helper
drm                   288960  3 drm_shmem_helper,ofdrm,drm_kms_helper
drm_panel_orientation_quirks       16  1 drm

I use DRM [=m], DRM_OFDRM [=m], DRM_RADEON [=n], DRM_FBDEV_EMULATION [=y], FB [=y] and FB_OF [=n] in my kernel test .config. As far as I understand  DRM_OFDRM and FB_OF would be mutually exclusive? Also does not seem to make a difference whether FB_SIMPLE [=y] is set.

Regards,
Erhard

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