Re: [PATCH v2 1/2] fbdev: Split frame buffer support in FB and FB_CORE symbols

From: Thomas Zimmermann
Date: Mon Jul 03 2023 - 03:53:03 EST


Hi

Am 03.07.23 um 09:46 schrieb Javier Martinez Canillas:
Thomas Zimmermann <tzimmermann@xxxxxxx> writes:

Hello Thomas,

Thanks for your review.

Hi

Am 01.07.23 um 23:44 schrieb Javier Martinez Canillas:

[...]

+menuconfig FB_CORE
+ tristate "Core support for frame buffer devices"

With the text, this is visible; as others noted.


Yes, I misremembered what made a Kconfig symbol non-visible, and thought
that was just the lack of a help section but forgot to remove the prompt.

This is already fixed in v3.

+
menuconfig FB
- tristate "Support for frame buffer devices"
+ tristate "Support for frame buffer device drivers"

Just keep the text as-is.


I disagree. Because we are slightly changing the Kconfig symbol semantics
here, for instance CONFIG_FB_CORE + CONFIG_DRM_FBDEV_EMULATION will also
provide a frame buffer device (and with CONFIG_FB_DEVICE, will be exposed
to user-space as a /dev/fb? device).

So now CONFIG_FB is really about allowing the native fbdev drivers to be
enabled. That's why I'm changing the prompt text to make that more clear.

[...]

config FB_DEVICE
bool "Provide legacy /dev/fb* device"
- depends on FB
+ select FB_CORE

This should depend on FB_CORE.


Yes, already fixed in v3 too. I did a select to prevent symbol circular
dependencies but doing that lead to CONFIG_FB_CORE=y even if CONFIG_DRM
was set as a module.

But with the "select FB_CORE if DRM_FBDEV_EMULATION" in the DRM symbol as
Arnd suggested, I was able to have FB_DEVICE to depend on FB_CORE again.

BTW, where does this item now show up in the menu? It used to be in the framebuffer menu. It's now in the graphics-drivers menu?

Best regards
Thomas


Best regards
Thomas



--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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