[PATCH v2 2/7] ramfb: Add driver for ramfb display

[Simon Glass]

On Tue, 22 Aug 2023 at 06:10, Alper Nebi Yasak <alpernebiyasak at gmail.com> wrote:
>
> From: Alexander Graf <agraf at csgraf.de>
>
> QEMU implements multiple ways to expose graphics output to the virt
> machine, but most of them are incompatible with hardware virtualization.
>
> The one that does work reliably is ramfb. It's a very simple mechanism
> in which the guest reserves a memory region for the frame buffer and then
> notifies the host about its location and properties. The host then just
> displays the contents of the frame buffer on screen.
>
> This patch implements a trivial version of a ramfb driver - hard coded
> to a single resolution set in Kconfig.
>
> Signed-off-by: Alexander Graf <agraf at csgraf.de>
> [Alper: Deduplicate depends on DM_VIDEO, drop MAINTAINERS, decouple from
>         EFI_LOADER, add .bind(), kconfigurable resolution, struct in .h]
> Co-developed-by: Alper Nebi Yasak <alpernebiyasak at gmail.com>
> Signed-off-by: Alper Nebi Yasak <alpernebiyasak at gmail.com>
> ---
>
> Changes in v2:
> - Remove extra "depends on DM_VIDEO" already in "if VIDEO"
> - Drop drivers/video/MAINTAINERS file
> - Decouple framebuffer allocation from EFI_LOADER
> - Add .bind() method for ramfb driver
> - Make resolution configurable with kconfig
> - Move struct to qfw.h and add comments for members
> - Use RAMFB_* definitions instead of DEFAULT_*
>
>  drivers/video/Kconfig  | 30 +++++++++++++
>  drivers/video/Makefile |  1 +
>  drivers/video/ramfb.c  | 97 ++++++++++++++++++++++++++++++++++++++++++
>  include/qfw.h          | 10 +++++
>  4 files changed, 138 insertions(+)
>  create mode 100644 drivers/video/ramfb.c

Reviewed-by: Simon Glass <sjg at chromium.org>