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drm/dp: Add macro to check max_downspread capability

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Add a macro to check for the max_downspread capability in
drm_dp_helper.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>

changes in v4:
    - Return 1 for DPCD version >= v1.1 (Stephen Boyd)
Link: https://lore.kernel.org/r/1635839325-401-4-git-send-email-quic_sbillaka@quicinc.com

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Sankeerth Billakanti 2021-11-02 13:18:43 +05:30 committed by Rob Clark
parent ef7837ff09
commit 447a39f4e8
1 changed files with 7 additions and 0 deletions
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7
include/drm/drm_dp_helper.h
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@ -1766,6 +1766,13 @@ drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED;
}
static inline bool
drm_dp_max_downspread(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
return dpcd[DP_DPCD_REV] >= 0x11 ||
dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5;
}
static inline bool
drm_dp_tps4_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{