linux-kernel - [PATCH v2 00/14] efi/gop: Refactoring + mode-setting feature

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Date:   Thu, 19 Mar 2020 22:00:14 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Hans de Goede <hdegoede@...hat.com>, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 00/14] efi/gop: Refactoring + mode-setting feature

This series is against tip:efi/core.

Patches 1-9 are small cleanups and refactoring of the code in
libstub/gop.c.

The rest of the patches add the ability to use a command-line option to
switch the gop's display mode.

The options supported are:
video=efifb:mode=n
        Choose a specific mode number
video=efifb:<xres>x<yres>[-(rgb|bgr|<bpp>)]
        Specify mode by resolution and optionally color depth
video=efifb:auto
        Let the EFI stub choose the highest resolution mode available.

The mode-setting additions increase code size of gop.o by about 3k on
x86-64 with EFI_MIXED enabled.

Changes in v2 (HT lkp@...el.com):
- Fix __efistub_global attribute to be after the variable.
  (NB: bunch of other places should ideally be fixed, those I guess
  don't matter as they are scalars?)
- Silence -Wmaybe-uninitialized warning in set_mode function.

Arvind Sankar (14):
  efi/gop: Remove redundant current_fb_base
  efi/gop: Move check for framebuffer before con_out
  efi/gop: Get mode information outside the loop
  efi/gop: Factor out locating the gop into a function
  efi/gop: Slightly re-arrange logic of find_gop
  efi/gop: Move variable declarations into loop block
  efi/gop: Use helper macros for populating lfb_base
  efi/gop: Use helper macros for find_bits
  efi/gop: Remove unreachable code from setup_pixel_info
  efi/gop: Add prototypes for query_mode and set_mode
  efi/gop: Allow specifying mode number on command line
  efi/gop: Allow specifying mode by <xres>x<yres>
  efi/gop: Allow specifying depth as well as resolution
  efi/gop: Allow automatically choosing the best mode

 Documentation/fb/efifb.rst                    |  33 +-
 arch/x86/include/asm/efi.h                    |   4 +
 .../firmware/efi/libstub/efi-stub-helper.c    |   3 +
 drivers/firmware/efi/libstub/efistub.h        |   8 +-
 drivers/firmware/efi/libstub/gop.c            | 489 ++++++++++++++----
 5 files changed, 428 insertions(+), 109 deletions(-)


base-commit: d5528d5e91041e68e8eab9792ce627705a0ed273
-- 
2.24.1