linux.git/drivers/gpu/drm/clients, branch v6.16

printk: Rename console_start to console_resume

2025-03-11T11:51:21+00:00

The intent of console_start was to resume a previously suspended console,
so rename it accordingly.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Reviewed-by: John Ogness 
Link: https://lore.kernel.org/r/20250226-printk-renaming-v1-4-0b878577f2e6@suse.com
[pmladek@suse.com: Fixed typo in the commit message. Updated also new drm_log.c.]
Signed-off-by: Petr Mladek

printk: Rename console_stop to console_suspend

2025-03-11T11:41:55+00:00

The intent of console_stop was in fact to suspend it, so rename the
function accordingly.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Reviewed-by: John Ogness 
Link: https://lore.kernel.org/r/20250226-printk-renaming-v1-3-0b878577f2e6@suse.com
[pmladek@suse.com: Fixed typo in the commit message. Updated also new drm_log.c]
Signed-off-by: Petr Mladek

drm/log: select CONFIG_FONT_SUPPORT

2024-12-12T17:26:32+00:00

Without fonts, this fails to link:

drivers/gpu/drm/clients/drm_log.o: in function `drm_log_init_client':
drm_log.c:(.text+0x3d4): undefined reference to `get_default_font'

Select this, like the other users do.

Fixes: f7b42442c4ac ("drm/log: Introduce a new boot logger to draw the kmsg on the screen")
Signed-off-by: Arnd Bergmann 
Reviewed-by: Jocelyn Falempe 
Signed-off-by: Jocelyn Falempe 
Link: https://patchwork.freedesktop.org/patch/msgid/20241212154003.1313437-1-arnd@kernel.org

drm/client: Fix drm client endless Kconfig loop

2024-12-12T10:22:32+00:00

if DRM_CLIENT_SELECTION is enabled, and none of the client is, the
"Default DRM Client" choice is empty, and this makes Kconfig goes
into an infinite loop of:

  Default DRM Client
  choice[1-0?]: 0
  Default DRM Client
  choice[1-0?]: 0
  Default DRM Client
  choice[1-0?]: 0
  ....

So only allow the choice if at least one of the client is selected.

Fixes: f7b42442c4ac ("drm/log: Introduce a new boot logger to draw the kmsg on the screen")
Reported-by: Dan Carpenter 
Closes: https://lore.kernel.org/dri-devel/20241204160014.1171469-1-jfalempe@redhat.com/T/#md78853bba8904fd7614073f280f721d13ab0b432
Signed-off-by: Jocelyn Falempe 
Tested-by: Dan Carpenter 
Acked-by: Simona Vetter 
Link: https://patchwork.freedesktop.org/patch/msgid/20241212091153.1592096-1-jfalempe@redhat.com

drm/log: Add integer scaling support

2024-12-10T13:36:54+00:00

Add a module parameter, to increase the font size for HiDPI screen.
Even with CONFIG_FONT_TER16x32, it can still be a bit small to read.
In this case, adding drm_log.scale=2 to your kernel command line will
double the character size.

Signed-off-by: Jocelyn Falempe 
Reviewed-by: Thomas Zimmermann 
Link: https://patchwork.freedesktop.org/patch/msgid/20241204160014.1171469-7-jfalempe@redhat.com

drm/log: Implement suspend/resume

2024-12-10T13:36:54+00:00

Normally the console is already suspended when the graphic driver
suspend callback is called, but if the parameter no_console_suspend
is set, it might still be active.
So call console_stop()/console_start() in the suspend/resume
callbacks, to make sure it won't try to write to the framebuffer
while the graphic driver is suspended.

Signed-off-by: Jocelyn Falempe 
Reviewed-by: John Ogness 
Acked-by: Petr Mladek 
Reviewed-by: Thomas Zimmermann 
Link: https://patchwork.freedesktop.org/patch/msgid/20241204160014.1171469-6-jfalempe@redhat.com

drm/log: Color the timestamp, to improve readability

2024-12-10T13:36:54+00:00

Color the timesamp prefix, similar to dmesg.

Signed-off-by: Jocelyn Falempe 
Reviewed-by: Thomas Zimmermann 
Link: https://patchwork.freedesktop.org/patch/msgid/20241204160014.1171469-5-jfalempe@redhat.com

drm/log: Do not draw if drm_master is taken

2024-12-10T13:36:53+00:00

When userspace takes drm_master, the drm_client buffer is no more
visible, so drm_log shouldn't waste CPU cycle to draw on it.

Signed-off-by: Jocelyn Falempe 
Reviewed-by: Thomas Zimmermann 
Link: https://patchwork.freedesktop.org/patch/msgid/20241204160014.1171469-4-jfalempe@redhat.com

drm/log: Introduce a new boot logger to draw the kmsg on the screen

2024-12-10T13:36:53+00:00

drm_log is a simple logger that uses the drm_client API to print the
kmsg boot log on the screen. This is not a full replacement to fbcon,
as it will only print the kmsg. It will never handle user input, or a
terminal because this is better done in userspace.

Design decisions:
 * It uses the drm_client API, so it should work on all drm drivers
   from the start.
 * It doesn't scroll the message, that way it doesn't need to redraw
   the whole screen for each new message.
   It also means it doesn't have to keep drawn messages in memory, to
   redraw them when scrolling.
 * It uses the new non-blocking console API, so it should work well
   with PREEMPT_RT.

This patch also adds a Kconfig menu to select the drm client to use.
It can be overwritten on the kernel command line with:
drm_client_lib.active=log or drm_client_lib.active=fbdev

Signed-off-by: Jocelyn Falempe 
Reviewed-by: John Ogness  # console API
Reviewed-by: Thomas Zimmermann 
Link: https://patchwork.freedesktop.org/patch/msgid/20241204160014.1171469-3-jfalempe@redhat.com

drm/fbdev-client: Unexport drm_fbdev_client_setup()

2024-11-15T08:42:21+00:00

DRM drivers invoke drm_client_setup() to set up in-kernel clients.
No driver should call drm_fbdev_client_setup() directly. Therefore,
unexport the symbol and move the declaration to the internal header
drm_client_internal.h.

Signed-off-by: Thomas Zimmermann 
Reviewed-by: Jocelyn Falempe 
Link: https://patchwork.freedesktop.org/patch/msgid/20241108154600.126162-4-tzimmermann@suse.de