drm/i915: Kill intel_dp->{link_bw, rate_select}

We only need the link_bw/rate_select parameters when starting link
training, and they should be computed based on the currently active
config, so throw them out from intel_dp and just compute on demand.

Toss in an extra debug print to see rate_select in addition to link_bw,
as the latter may be 0 for eDP 1.4.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 6231eb1..b905c19 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1376,6 +1376,19 @@ int intel_dp_rate_select(struct intel_dp *intel_dp, int rate)
        return rate_to_index(rate, intel_dp->sink_rates);
 }
 
+static void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,
+                                 uint8_t *link_bw, uint8_t *rate_select)
+{
+       if (intel_dp->num_sink_rates) {
+               *link_bw = 0;
+               *rate_select =
+                       intel_dp_rate_select(intel_dp, port_clock);
+       } else {
+               *link_bw = drm_dp_link_rate_to_bw_code(port_clock);
+               *rate_select = 0;
+       }
+}
+
 bool
 intel_dp_compute_config(struct intel_encoder *encoder,
                        struct intel_crtc_state *pipe_config)
@@ -1397,6 +1410,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
        int link_avail, link_clock;
        int common_rates[DP_MAX_SUPPORTED_RATES] = {};
        int common_len;
+       uint8_t link_bw, rate_select;
 
        common_len = intel_dp_common_rates(intel_dp, common_rates);
 
@@ -1501,21 +1515,14 @@ found:
 
        pipe_config->lane_count = lane_count;
 
-       if (intel_dp->num_sink_rates) {
-               intel_dp->link_bw = 0;
-               intel_dp->rate_select =
-                       intel_dp_rate_select(intel_dp, common_rates[clock]);
-       } else {
-               intel_dp->link_bw =
-                       drm_dp_link_rate_to_bw_code(common_rates[clock]);
-               intel_dp->rate_select = 0;
-       }
-
        pipe_config->pipe_bpp = bpp;
        pipe_config->port_clock = common_rates[clock];
 
-       DRM_DEBUG_KMS("DP link bw %02x lane count %d clock %d bpp %d\n",
-                     intel_dp->link_bw, pipe_config->lane_count,
+       intel_dp_compute_rate(intel_dp, pipe_config->port_clock,
+                             &link_bw, &rate_select);
+
+       DRM_DEBUG_KMS("DP link bw %02x rate select %02x lane count %d clock %d bpp %d\n",
+                     link_bw, rate_select, pipe_config->lane_count,
                      pipe_config->port_clock, bpp);
        DRM_DEBUG_KMS("DP link bw required %i available %i\n",
                      mode_rate, link_avail);
@@ -3624,19 +3631,23 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
        int voltage_tries, loop_tries;
        uint32_t DP = intel_dp->DP;
        uint8_t link_config[2];
+       uint8_t link_bw, rate_select;
 
        if (HAS_DDI(dev))
                intel_ddi_prepare_link_retrain(encoder);
 
+       intel_dp_compute_rate(intel_dp, crtc->config->port_clock,
+                             &link_bw, &rate_select);
+
        /* Write the link configuration data */
-       link_config[0] = intel_dp->link_bw;
+       link_config[0] = link_bw;
        link_config[1] = crtc->config->lane_count;
        if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
                link_config[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
        drm_dp_dpcd_write(&intel_dp->aux, DP_LINK_BW_SET, link_config, 2);
        if (intel_dp->num_sink_rates)
                drm_dp_dpcd_write(&intel_dp->aux, DP_LINK_RATE_SET,
-                               &intel_dp->rate_select, 1);
+                                 &rate_select, 1);
 
        link_config[0] = 0;
        link_config[1] = DP_SET_ANSI_8B10B;

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index fdb5e31..1dd2b37 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -38,7 +38,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
        struct intel_dp *intel_dp = &intel_dig_port->dp;
        struct drm_atomic_state *state;
        int bpp, i;
-       int lane_count, slots, rate;
+       int lane_count, slots;
        struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
        struct drm_connector *drm_connector;
        struct intel_connector *connector, *found = NULL;
@@ -55,20 +55,11 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
         */
        lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
 
-       rate = intel_dp_max_link_rate(intel_dp);
-
-       if (intel_dp->num_sink_rates) {
-               intel_dp->link_bw = 0;
-               intel_dp->rate_select = intel_dp_rate_select(intel_dp, rate);
-       } else {
-               intel_dp->link_bw = drm_dp_link_rate_to_bw_code(rate);
-               intel_dp->rate_select = 0;
-       }
 
        pipe_config->lane_count = lane_count;
 
        pipe_config->pipe_bpp = 24;
-       pipe_config->port_clock = rate;
+       pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
 
        state = pipe_config->base.state;
 

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 0a11041..22dc8b6 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -712,8 +712,6 @@ struct intel_dp {
        enum hdmi_force_audio force_audio;
        bool limited_color_range;
        bool color_range_auto;
-       uint8_t link_bw;
-       uint8_t rate_select;
        uint8_t dpcd[DP_RECEIVER_CAP_SIZE];
        uint8_t psr_dpcd[EDP_PSR_RECEIVER_CAP_SIZE];
        uint8_t downstream_ports[DP_MAX_DOWNSTREAM_PORTS];