From: Manasi Navare <manasi.d.navare@intel.com>
Date: Mon, 22 Jan 2018 14:43:10 -0800
Subject: drm/dp: Add HBR3 support in existing DRM DP helpers
Git-commit: e0bd878a959008f02a1280b1dd2c128324586af3
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Existing helpers add support upto HBR2. This patch
adds support for HBR3 rate (8.1 Gbps) introduced as
part of DP 1.4 specification.
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1516660991-20697-1-git-send-email-manasi.d.navare@intel.com
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/drm_dp_helper.c | 4 ++++
drivers/gpu/drm/drm_dp_mst_topology.c | 3 +++
include/drm/drm_dp_helper.h | 1 +
3 files changed, 8 insertions(+)
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -146,6 +146,8 @@ u8 drm_dp_link_rate_to_bw_code(int link_
return DP_LINK_BW_2_7;
case 540000:
return DP_LINK_BW_5_4;
+ case 810000:
+ return DP_LINK_BW_8_1;
}
}
EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code);
@@ -161,6 +163,8 @@ int drm_dp_bw_code_to_link_rate(u8 link_
return 270000;
case DP_LINK_BW_5_4:
return 540000;
+ case DP_LINK_BW_8_1:
+ return 810000;
}
}
EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2087,6 +2087,9 @@ static bool drm_dp_get_vc_payload_bw(int
case DP_LINK_BW_5_4:
*out = 10 * dp_link_count;
break;
+ case DP_LINK_BW_8_1:
+ *out = 15 * dp_link_count;
+ break;
}
return true;
}
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -334,6 +334,7 @@
# define DP_LINK_BW_1_62 0x06
# define DP_LINK_BW_2_7 0x0a
# define DP_LINK_BW_5_4 0x14 /* 1.2 */
+# define DP_LINK_BW_8_1 0x1e /* 1.4 */
#define DP_LANE_COUNT_SET 0x101
# define DP_LANE_COUNT_MASK 0x0f