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[ Upstream commit4aa8961b1b] At least some panels using the LSB register are not happy with the unconditional increase of the command buffer to 3 bytes. With the BOE NE14QDM in my Dell Latitude 7455, the recent patches for luminance based brightness have introduced a regression: the brightness range stopped being contiguous and became nonsensical (it probably was interpreting the last 2 bytes of the buffer and not the first 2). Change from using a fixed sizeof() to a length variable that's only set to 3 when luminance is used. Let's leave the default as 2 even for the single-byte version, since that's how it worked before. Fixes:f2db78e37f("drm/dp: Modify drm_edp_backlight_set_level") Signed-off-by: Val Packett <val@packett.cool> Tested-by: Abel Vesa <abel.vesa@linaro.org> Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com> Link: https://lore.kernel.org/r/20250706204446.8918-1-val@packett.cool Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>