drm/i915/psr: Check for the specific AUX_FRAME_SYNC cap bit.

The cap check should be specifically for bit 0 instead of any bit.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Fixes: 474d1ec4a3d7 ("drm/i915/skl: Enabling PSR2 SU with frame sync")
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180223221520.18464-4-dhinakaran.pandiyan@intel.com

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 8f8bcff..b7cc6dd 100644 (file)
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -144,7 +144,7 @@ void intel_psr_init_dpcd(struct intel_dp *intel_dp)
                                      DP_SINK_DEVICE_AUX_FRAME_SYNC_CAP,
                                      &frame_sync_cap) != 1)
                        frame_sync_cap = 0;
-               dev_priv->psr.aux_frame_sync = frame_sync_cap ? true : false;
+               dev_priv->psr.aux_frame_sync = frame_sync_cap & DP_AUX_FRAME_SYNC_CAP;
                /* PSR2 needs frame sync as well */
                dev_priv->psr.psr2_support = dev_priv->psr.aux_frame_sync;
                DRM_DEBUG_KMS("PSR2 %s on sink",