diff options
| author | David S. Miller <davem@davemloft.net> | 2017-11-04 09:26:51 +0900 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-11-04 09:26:51 +0900 |
| commit | 2a171788ba7bb61995e98e8163204fc7880f63b2 (patch) | |
| tree | 4150a94dd08323748116e5051e56ddee830d4812 /drivers/gpu/drm/i915/intel_dp.c | |
| parent | bf5345882bd18bc1b4966d170c0491ebe5c9a7d6 (diff) | |
| parent | d4c2e9fca5b7db8d315d93a072e65d0847f8e0c5 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Files removed in 'net-next' had their license header updated
in 'net'. We take the remove from 'net-next'.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 203198659ab2..09f274419eea 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3731,9 +3731,16 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp) } - /* Read the eDP Display control capabilities registers */ - if ((intel_dp->dpcd[DP_EDP_CONFIGURATION_CAP] & DP_DPCD_DISPLAY_CONTROL_CAPABLE) && - drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_DPCD_REV, + /* + * Read the eDP display control registers. + * + * Do this independent of DP_DPCD_DISPLAY_CONTROL_CAPABLE bit in + * DP_EDP_CONFIGURATION_CAP, because some buggy displays do not have it + * set, but require eDP 1.4+ detection (e.g. for supported link rates + * method). The display control registers should read zero if they're + * not supported anyway. + */ + if (drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_DPCD_REV, intel_dp->edp_dpcd, sizeof(intel_dp->edp_dpcd)) == sizeof(intel_dp->edp_dpcd)) DRM_DEBUG_KMS("EDP DPCD : %*ph\n", (int) sizeof(intel_dp->edp_dpcd), |