Hi Andy,

On Wed, Feb 9, 2022 at 2:48 PM Andy Shevchenko
[off-list ref] wrote:

On Tue, Feb 08, 2022 at 04:10:49PM +0100, Javier Martinez Canillas wrote:

quoted

On 2/8/22 15:19, Geert Uytterhoeven wrote:

quoted

On Fri, Feb 4, 2022 at 2:43 PM Javier Martinez Canillas
[off-list ref] wrote:
  - Kernel size increased by 349 KiB,
  - The "Memory:" line reports 412 KiB less memory,
  - On top of that, "free" shows ca. 92 KiB more memory in use after
    bootup.

The memory consumption should really be taken seriously, because these kind of
displays are for embedded platforms with limited amount of resources.

Thanks for your concern!

Looking at the options that are auto-enabled, a few stand out that
look like they're not needed on systems witch such small displays,
or on legacy systems predating DDC:

    menuconfig DRM
            tristate "Direct Rendering Manager (XFree86 4.1.0 and
higher DRI support)"
            depends on (AGP || AGP=n) && !EMULATED_CMPXCHG && HAS_DMA
            select DRM_NOMODESET
            select DRM_PANEL_ORIENTATION_QUIRKS
            select HDMI

Not everyone pays HDMI royalties ;-)

            select FB_CMDLINE
            select I2C
            select I2C_ALGOBIT

I do need I2C, as it's the transport for my SSD1306 display, but not
everyone needs it.

            select DMA_SHARED_BUFFER
            select SYNC_FILE
    # gallium uses SYS_kcmp for os_same_file_description() to de-duplicate
    # device and dmabuf fd. Let's make sure that is available for our userspace.
            select KCMP

And:

    config DRM_BRIDGE
            def_bool y
            depends on DRM
            help
              Bridge registration and lookup framework.

    config DRM_PANEL_BRIDGE
            def_bool y


Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds