linux-kernel - Re: [v10,20/27] drm/connector: hdmi: Add Infoframes generation

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Date: Fri, 22 Mar 2024 11:22:14 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>, Maxime Ripard
 <mripard@...nel.org>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann
 <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Daniel Vetter
 <daniel@...ll.ch>, Jonathan Corbet <corbet@....net>, Sandy Huang
 <hjc@...k-chips.com>, Heiko Stübner <heiko@...ech.de>,
 Chen-Yu Tsai
 <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, Samuel Holland
 <samuel@...lland.org>
Cc: Hans Verkuil <hverkuil@...all.nl>, Sebastian Wick
 <sebastian.wick@...hat.com>, Ville Syrjälä
 <ville.syrjala@...ux.intel.com>, dri-devel@...ts.freedesktop.org,
 linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [v10,20/27] drm/connector: hdmi: Add Infoframes generation

On Fri, 22 Mar 2024, Sui Jingfeng <sui.jingfeng@...ux.dev> wrote:
> Hi,
>
>
> On 2024/3/21 23:29, Maxime Ripard wrote:
>> Infoframes in KMS is usually handled by a bunch of low-level helpers
>> that require quite some boilerplate for drivers. This leads to
>> discrepancies with how drivers generate them, and which are actually
>> sent.
>>
>> Now that we have everything needed to generate them in the HDMI
>> connector state, we can generate them in our common logic so that
>> drivers can simply reuse what we precomputed.
>>
>> Signed-off-by: Maxime Ripard <mripard@...nel.org>
>> ---
>>   drivers/gpu/drm/Kconfig                            |   1 +
>>   drivers/gpu/drm/drm_atomic_state_helper.c          | 338 +++++++++++++++++++++
>>   drivers/gpu/drm/drm_connector.c                    |  14 +
>>   .../gpu/drm/tests/drm_atomic_state_helper_test.c   |   1 +
>>   drivers/gpu/drm/tests/drm_connector_test.c         |  12 +
>>   include/drm/drm_atomic_state_helper.h              |   8 +
>>   include/drm/drm_connector.h                        | 109 +++++++
>>   7 files changed, 483 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
>> index 16029435b750..3d3193c7aa5f 100644
>> --- a/drivers/gpu/drm/Kconfig
>> +++ b/drivers/gpu/drm/Kconfig
>> @@ -97,10 +97,11 @@ config DRM_KUNIT_TEST
>>   	  If in doubt, say "N".
>>   
>>   config DRM_KMS_HELPER
>>   	tristate
>>   	depends on DRM
>> +	select DRM_DISPLAY_HDMI_HELPER
>
> Should we select DRM_DISPLAY_HELPER here? Otherwise there will have some compile error
> emerged with default config.

Can we stop abusing select instead of adding more selects to paper over
the issues?

Use select only for non-visible symbols (no prompts anywhere) and for
symbols with no dependencies.


BR,
Jani.


>
>
> : drivers/gpu/drm/drm_atomic_state_helper.o: in function `drm_atomic_helper_connector_hdmi_check':
> drm_atomic_state_helper.c:(.text+0x15e4): undefined reference to `drm_hdmi_avi_infoframe_colorimetry'
> : drm_atomic_state_helper.c:(.text+0x15f0): undefined reference to `drm_hdmi_avi_infoframe_bars'
> : drm_atomic_state_helper.c:(.text+0x1638): undefined reference to `drm_hdmi_infoframe_set_hdr_metadata'
> make[2]: *** [scripts/Makefile.vmlinux:37: vmlinux] Error 1
>
> make[1]: *** [/home/suijingfeng/UpStream/drm-tip/Makefile:1162: vmlinux] Error 2
>
> make[1]: *** Waiting for unfinished jobs....
> make: *** [Makefile:240: __sub-make] Error 2
>
>>   	help
>>   	  CRTC helpers for KMS drivers.
>>   
>>   config DRM_DEBUG_DP_MST_TOPOLOGY_REFS
>>           bool "Enable refcount backtrace history in the DP MST helpers"

-- 
Jani Nikula, Intel