[v7,0/4] drm: Minimum backlight overrides and implementation for amdgpu

Message

Thomas Weißschuh Nov. 11, 2024, 6:09 p.m. UTC

The value of "min_input_signal" returned from ATIF on a Framework AMD 13
is "12". This leads to a fairly bright minimum display backlight.

Introduce a quirk to override "min_input_signal" to "0" which leads to a
much lower minimum brightness, which is still readable even in daylight.

One solution would be a fixed firmware version, which was announced but
has no timeline.

---
Changes in v7:
- Rebase on drm-next
- Drop now unnecessary hacky allocation of struct drm_edid
- Link to v6: https://lore.kernel.org/r/[e-mail]

Changes in v6:
- Clean up cover letter and commit messages
- Add my S-o-b to patch from Dustin
- Mention testing in combination with "panel_power_savings"
- Link to v5: https://lore.kernel.org/r/[e-mail]

Changes in v5:
- Forward-declare struct drm_edid
- Reorder patches, quirk entries are last
- Add patch from Dustin for additional quirk entries
- Link to v4: https://lore.kernel.org/r/[e-mail]

Changes in v4:
- Switch back to v2 implementation
- Add MODULE_DESCRIPTION()
- Simplify quirk infrastructure to only handle min backlight quirks.
  It can be extended if necessary.
- Expand documentation.
- Link to v3: https://lore.kernel.org/r/[e-mail]

Changes in v3:
- Switch to cmdline override parameter
- Link to v2: https://lore.kernel.org/r/[e-mail]

Changes in v2:
- Introduce proper drm backlight quirk infrastructure
- Quirk by EDID and DMI instead of only DMI
- Limit quirk to only single Framework 13 matte panel
- Link to v1: https://lore.kernel.org/r/[e-mail]

---
Dustin L. Howett (1):
      drm: panel-backlight-quirks: Add Framework 13 glossy and 2.8k panels

Thomas Weißschuh (3):
      drm: Add panel backlight quirks
      drm/amd/display: Add support for minimum backlight quirk
      drm: panel-backlight-quirks: Add Framework 13 matte panel

 Documentation/gpu/drm-kms-helpers.rst             |  3 +
 drivers/gpu/drm/Kconfig                           |  4 +
 drivers/gpu/drm/Makefile                          |  1 +
 drivers/gpu/drm/amd/amdgpu/Kconfig                |  1 +
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  6 ++
 drivers/gpu/drm/drm_panel_backlight_quirks.c      | 94 +++++++++++++++++++++++
 include/drm/drm_utils.h                           |  4 +
 7 files changed, 113 insertions(+)
---
base-commit: 377dda2cff59825079aee3906aa4904779747b0b
change-id: 20240610-amdgpu-min-backlight-quirk-8402fd8e736a

Best regards,

Comments

Mario Limonciello Nov. 21, 2024, 3:53 p.m. UTC | #1

On 11/11/2024 12:09, Thomas Weißschuh wrote:
> The value of "min_input_signal" returned from ATIF on a Framework AMD 13
> is "12". This leads to a fairly bright minimum display backlight.
> 
> Introduce a quirk to override "min_input_signal" to "0" which leads to a
> much lower minimum brightness, which is still readable even in daylight.
> 
> One solution would be a fixed firmware version, which was announced but
> has no timeline.

Hi Thomas,

Thanks for this resubmission and the rebase.  Apologies for the delay, 
but this is now picked up to drm-misc-next.

https://cgit.freedesktop.org/drm/drm-misc/commit/?id=22e5c7ae12145af13785e3ff138395d5b1a22116
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c2753b2471c65955de18cbc58530641447e5bfe9
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=916ecc0db336768d80e14ef28a8c64a775274f95
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=d80b5c5b9be6b2e1cdeaaeaa8259523b63cae292

Thanks!

> 
> ---
> Changes in v7:
> - Rebase on drm-next
> - Drop now unnecessary hacky allocation of struct drm_edid
> - Link to v6: https://lore.kernel.org/r/[e-mail]
> 
> Changes in v6:
> - Clean up cover letter and commit messages
> - Add my S-o-b to patch from Dustin
> - Mention testing in combination with "panel_power_savings"
> - Link to v5: https://lore.kernel.org/r/[e-mail]
> 
> Changes in v5:
> - Forward-declare struct drm_edid
> - Reorder patches, quirk entries are last
> - Add patch from Dustin for additional quirk entries
> - Link to v4: https://lore.kernel.org/r/[e-mail]
> 
> Changes in v4:
> - Switch back to v2 implementation
> - Add MODULE_DESCRIPTION()
> - Simplify quirk infrastructure to only handle min backlight quirks.
>    It can be extended if necessary.
> - Expand documentation.
> - Link to v3: https://lore.kernel.org/r/[e-mail]
> 
> Changes in v3:
> - Switch to cmdline override parameter
> - Link to v2: https://lore.kernel.org/r/[e-mail]
> 
> Changes in v2:
> - Introduce proper drm backlight quirk infrastructure
> - Quirk by EDID and DMI instead of only DMI
> - Limit quirk to only single Framework 13 matte panel
> - Link to v1: https://lore.kernel.org/r/[e-mail]
> 
> ---
> Dustin L. Howett (1):
>        drm: panel-backlight-quirks: Add Framework 13 glossy and 2.8k panels
> 
> Thomas Weißschuh (3):
>        drm: Add panel backlight quirks
>        drm/amd/display: Add support for minimum backlight quirk
>        drm: panel-backlight-quirks: Add Framework 13 matte panel
> 
>   Documentation/gpu/drm-kms-helpers.rst             |  3 +
>   drivers/gpu/drm/Kconfig                           |  4 +
>   drivers/gpu/drm/Makefile                          |  1 +
>   drivers/gpu/drm/amd/amdgpu/Kconfig                |  1 +
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  6 ++
>   drivers/gpu/drm/drm_panel_backlight_quirks.c      | 94 +++++++++++++++++++++++
>   include/drm/drm_utils.h                           |  4 +
>   7 files changed, 113 insertions(+)
> ---
> base-commit: 377dda2cff59825079aee3906aa4904779747b0b
> change-id: 20240610-amdgpu-min-backlight-quirk-8402fd8e736a
> 
> Best regards,