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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-10-18 10:15:27 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-10-22 22:34:45 +0200 |
| commit | 0f037bdee1a12947a0c55b21a05f57793332bc07 (patch) | |
| tree | 200cae72c4681af7849422ac1ee3b5937de55603 /drivers/gpu/drm/drm_dp_helper.c | |
| parent | 01916270b840f7f37b7daab936add1747d6afbbf (diff) | |
| download | linux-0f037bdee1a12947a0c55b21a05f57793332bc07.tar.gz | |
drm: extract helpers to compute new training values from sink request
Safe for the minor difference that the intel versions get an offset into the link_status as an argument, both are the same again. Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Acked-by: Dave Airlie <airlied@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_dp_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_helper.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 1378b789bd10..9461e2f27316 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -255,3 +255,30 @@ bool drm_dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE], return true; } EXPORT_SYMBOL(drm_dp_clock_recovery_ok); + +u8 drm_dp_get_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE], + int lane) +{ + int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); + int s = ((lane & 1) ? + DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : + DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); + u8 l = dp_link_status(link_status, i); + + return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT; +} +EXPORT_SYMBOL(drm_dp_get_adjust_request_voltage); + +u8 drm_dp_get_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE], + int lane) +{ + int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); + int s = ((lane & 1) ? + DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : + DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); + u8 l = dp_link_status(link_status, i); + + return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT; +} +EXPORT_SYMBOL(drm_dp_get_adjust_request_pre_emphasis); + |