While clearing the Ports ync mode enable and master select bits we need to make sure that we perform a RMW for disable else it sets the other bits casuing unwanted sideeffects.
Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/5 Cc: Ville Syrjälä <ville.syrj...@linux.intel.com> Cc: Jani Nikula <jani.nik...@intel.com> Fixes: 51528afe7c5e ("drm/i915/display/icl: Disable transcoder port sync as part of crtc_disable() sequence") Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com> --- drivers/gpu/drm/i915/display/intel_display.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index c0a2dab3fe67..3fccda0f1f36 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -4599,7 +4599,8 @@ static void icl_disable_transcoder_port_sync(const struct intel_crtc_state *old_ transcoder_name(old_crtc_state->cpu_transcoder)); reg = TRANS_DDI_FUNC_CTL2(old_crtc_state->cpu_transcoder); - trans_ddi_func_ctl2_val = ~(PORT_SYNC_MODE_ENABLE | + trans_ddi_func_ctl2_val = I915_READ(reg); + trans_ddi_func_ctl2_val &= ~(PORT_SYNC_MODE_ENABLE | PORT_SYNC_MODE_MASTER_SELECT_MASK); I915_WRITE(reg, trans_ddi_func_ctl2_val); } -- 2.19.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
