From b9d44f9b6d2b5cfdafba64a8389d1727e409900d Mon Sep 17 00:00:00 2001
From: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Date: Tue, 2 Nov 2021 13:18:43 +0530
Subject: drm/dp: Add macro to check max_downspread capability
Git-commit: 447a39f4e89d992f82f03521d46746f6a4348578
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
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>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
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 8b2ed4199284..30359e434c3f 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1783,6 +1783,13 @@ 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])
{
--
2.38.1