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drm/dp: Add HBR3 support in existing DRM DP helpers 

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
This commit is contained in:
Manasi Navare 2018-01-22 14:43:10 -08:00 committed by Jani Nikula
parent a35f2f34b5
commit e0bd878a95
3 changed files with 8 additions and 0 deletions
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4
drivers/gpu/drm/drm_dp_helper.c
View File

@ -146,6 +146,8 @@ u8 drm_dp_link_rate_to_bw_code(int link_rate)
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_bw)
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);

3
drivers/gpu/drm/drm_dp_mst_topology.c
View File

@ -2087,6 +2087,9 @@ static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
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;
}

1
include/drm/drm_dp_helper.h
View File

@ -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