[PATCH v4 3/5] drm/dp: Add macro to check max_downspread capability

[Sankeerth Billakanti <quic_sbillaka@xxxxxxxxxxx>]

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

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@xxxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>

changes in v4:
    - Return 1 for DPCD version >= v1.1 (Stephen Boyd)
---
 include/drm/drm_dp_helper.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index b52df4d..596635c 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1767,6 +1767,13 @@ drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 }
 
 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])
 {
 	return dpcd[DP_DPCD_REV] >= 0x14 &&
-- 
2.7.4