diff options
| author | Fangzhi Zuo <Jerry.Zuo@amd.com> | 2025-07-09 21:42:54 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2025-08-04 14:40:06 -0400 |
| commit | fa5f99ee7260e067e4e3c1350243471862fad11c (patch) | |
| tree | 8bf6ab9a124e66f9e602e3ba6b37ca66c8176e3c /drivers/gpu/drm/amd/display/amdgpu_dm | |
| parent | 6ec8a5cbec751625133461600d0d4950ffd3a214 (diff) | |
drm/amd/display: Avoid Read Remote DPCD Many Times
Reading remote dpcd is time consuming. Instead of reading each byte
one by one, read 16 bytes together.
Reviewed-by: ChiaHsuan (Tom) Chung <chiahsuan.chung@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c index 137f18d41f1b..32281bf62f70 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c @@ -1763,14 +1763,17 @@ static bool dp_get_link_current_set_bw(struct drm_dp_aux *aux, uint32_t *cur_lin union lane_count_set lane_count; u8 dp_link_encoding; u8 link_bw_set = 0; + u8 data[16] = {0}; *cur_link_bw = 0; - if (drm_dp_dpcd_read(aux, DP_MAIN_LINK_CHANNEL_CODING_SET, &dp_link_encoding, 1) != 1 || - drm_dp_dpcd_read(aux, DP_LANE_COUNT_SET, &lane_count.raw, 1) != 1 || - drm_dp_dpcd_read(aux, DP_LINK_BW_SET, &link_bw_set, 1) != 1) + if (drm_dp_dpcd_read(aux, DP_LINK_BW_SET, data, 16) != 16) return false; + dp_link_encoding = data[DP_MAIN_LINK_CHANNEL_CODING_SET - DP_LINK_BW_SET]; + link_bw_set = data[DP_LINK_BW_SET - DP_LINK_BW_SET]; + lane_count.raw = data[DP_LANE_COUNT_SET - DP_LINK_BW_SET]; + switch (dp_link_encoding) { case DP_8b_10b_ENCODING: link_rate = link_bw_set; |