drm/i915/vbt: Fix backlight parsing for VBT 234+

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Child min_brightness is obsolete from VBT 234+, instead the new
min_brightness field in the main structure should be used.

This new field is 16 bits wide, so backlight_precision_bits is needed
to check if value needs to be scaled down but it is only available in
VBT 236+ so working around it by using the also new backlight_level
in the main struct.

v2:
- missed that backlight_data->level is also obsolete

v3:
- s/backlight/brightness to better match specification
- using u16 to specify brightness level instead of a u32 : 16

BSpec: 20149
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201008211932.24989-1-jose.souza@intel.com

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This commit is contained in:

José Roberto de Souza 2020-10-08 14:19:30 -07:00

parent 63b9d9aa85

commit d381baad29

2 changed files with 38 additions and 4 deletions

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30

drivers/gpu/drm/i915/display/intel_bios.c

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12

drivers/gpu/drm/i915/display/intel_vbt_defs.h

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