linux-kernel - Re: build error: f7655d42fcee drm/edid: Add CTA-861-G modes with VIC >= 193

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Message-ID: <3e5d7142-cacc-6830-94d3-f57ef18592d9@gmail.com>
Date:   Tue, 11 Feb 2020 13:06:05 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>
Subject: Re: build error: f7655d42fcee drm/edid: Add CTA-861-G modes with VIC
 >= 193

On 2/11/20 12:48 PM, Frank Rowand wrote:
> I am getting a kernel build error at version 5.6-rc1:
> 
> drivers/gpu/drm/drm_edid.c: In function 'cea_mode_alternate_timings':
> drivers/gpu/drm/drm_edid.c:3275:2: error: call to '__compiletime_assert_3282' declared with attribute error: BUILD_BUG_ON failed: cea_mode_for_vic(8)->vtotal != 262 || cea_mode_for_vic(9)->vtotal != 262 || cea_mode_for_vic(12)->vtotal != 262 || cea_mode_for_vic(13)->vtotal != 262 || cea_mode_for_vic(23)->vtotal != 312 || cea_mode_for_vic(24)->vtotal != 312 || cea_mode_for_vic(27)->vtotal != 312 || cea_mode_for_vic(28)->vtotal != 312
> make[4]: *** [drivers/gpu/drm/drm_edid.o] Error 1
> 
> 
> Kernel configuration:
>   make qcom_defconfig
> 
>   (arch/arm/configs/qcom_defconfig)
> 
> 
> Compiler is arm-eabi-gcc 4.6.x
> 
> 
> The build error goes away if I revert:
> 
>    f7655d42fcee drm/edid: Add CTA-861-G modes with VIC >= 193

I did not actually revert f7655d42fcee from 5.6-rc1.  I checked out the commit
before f7655d42fcee and was able to build the kernel.  Then I checked out
f7655d42fcee and the build failed in the same manner as at 5.6-rc1.

Simply reverting f7655d42fcee at 5.6-rc1 does not result in a buildable
kernel due to other related changes.

-Frank

> 
> 
> The build error also goes away if I comment out the two lines added to cea_mode_for_vic():
> 
>  	if (vic >= 193 && vic < 193 + ARRAY_SIZE(edid_cea_modes_193))
>  		return &edid_cea_modes_193[vic - 193];
> 
> 
> -Frank
>