drm/msm/dp: allow voltage swing / pre emphasis of 3

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Both dp_link_adjust_levels() and dp_ctrl_update_vx_px() limit swing and
pre-emphasis to 2, while the real maximum value for the sum of the
voltage swing and pre-emphasis is 3. Fix the DP code to remove this
limitation.

Fixes: c943b4948b ("drm/msm/dp: add displayPort driver support")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Tested-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/577006/
Link: https://lore.kernel.org/r/20240203-dp-swing-3-v1-1-6545e1706196@linaro.org

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This commit is contained in:

Dmitry Baryshkov 2024-02-03 15:47:25 +02:00

parent 766f705204

commit 22578178e5

3 changed files with 15 additions and 27 deletions

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6

drivers/gpu/drm/msm/dp/dp_ctrl.c

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22

drivers/gpu/drm/msm/dp/dp_link.c

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14

drivers/gpu/drm/msm/dp/dp_link.h

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