From 2b5cf4ef541f1b2facaca58cae5e8e0b5f19ad4c Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Fri, 31 Aug 2018 20:47:39 +0300
Subject: [PATCH] drm/i915/dp_mst: Fix enabling pipe clock for all streams
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commit afb2c4437dae ("drm/i915/ddi: Push pipe clock enabling to encoders")
inadvertently stopped enabling the pipe clock for any DP-MST stream
after the first one. It also rearranged the pipe clock enabling wrt.
initial MST payload allocation step (which may or may not be a
problem, but it's contrary to the spec.).
Fix things by making the above commit truly a non-functional change.
Fixes: afb2c4437dae ("drm/i915/ddi: Push pipe clock enabling to encoders")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107365
Reported-by: Lyude Paul <lyude@redhat.com>
Reported-by: dmummenschanz@web.de
Tested-by: dmummenschanz@web.de
Tested-by: Lyude Paul <lyude@redhat.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: dmummenschanz@web.de
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180831174739.30387-1-imre.deak@intel.com
---
drivers/gpu/drm/i915/intel_ddi.c | 17 +++++++++--------
drivers/gpu/drm/i915/intel_dp_mst.c | 4 ++++
2 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index f3b115ce4029..dcb1a98d624d 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2912,7 +2912,8 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
icl_enable_phy_clock_gating(dig_port);
- intel_ddi_enable_pipe_clock(crtc_state);
+ if (!is_mst)
+ intel_ddi_enable_pipe_clock(crtc_state);
}
static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
@@ -3015,14 +3016,14 @@ static void intel_ddi_post_disable_dp(struct intel_encoder *encoder,
bool is_mst = intel_crtc_has_type(old_crtc_state,
INTEL_OUTPUT_DP_MST);
- intel_ddi_disable_pipe_clock(old_crtc_state);
-
- /*
- * Power down sink before disabling the port, otherwise we end
- * up getting interrupts from the sink on detecting link loss.
- */
- if (!is_mst)
+ if (!is_mst) {
+ intel_ddi_disable_pipe_clock(old_crtc_state);
+ /*
+ * Power down sink before disabling the port, otherwise we end
+ * up getting interrupts from the sink on detecting link loss.
+ */
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
+ }
intel_disable_ddi_buf(encoder);
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 352e5216cc65..77920f1a3da1 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -166,6 +166,8 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
struct intel_connector *connector =
to_intel_connector(old_conn_state->connector);
+ intel_ddi_disable_pipe_clock(old_crtc_state);
+
/* this can fail */
drm_dp_check_act_status(&intel_dp->mst_mgr);
/* and this can also fail */
@@ -249,6 +251,8 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
I915_WRITE(DP_TP_STATUS(port), temp);
ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
+
+ intel_ddi_enable_pipe_clock(pipe_config);
}
static void intel_mst_enable_dp(struct intel_encoder *encoder,
--
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