drm/i915: Store the converted link rates in intel_dp->supported_rates[]

No point in converting from hardware format every single time, just
store the rates in the final format under intel_dp.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com>
Reviewed-by: Todd Previte <tprevite@gmail.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 a9b9847..f71ede7 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1144,8 +1144,6 @@ static int
 intel_read_sink_rates(struct intel_dp *intel_dp, int *sink_rates)
 {
        struct drm_device *dev = intel_dp_to_dev(intel_dp);
-       int i = 0;
-       uint16_t val;
 
        if (INTEL_INFO(dev)->gen >= 9 && intel_dp->supported_rates[0]) {
                /*
@@ -1153,18 +1151,12 @@ intel_read_sink_rates(struct intel_dp *intel_dp, int *sink_rates)
                 * link rate table method, so read link rates from
                 * supported_link_rates
                 */
-               for (i = 0; i < DP_MAX_SUPPORTED_RATES; ++i) {
-                       val = le16_to_cpu(intel_dp->supported_rates[i]);
-                       if (val == 0)
-                               break;
-
-                       sink_rates[i] = val * 200;
-               }
+               memcpy(sink_rates, intel_dp->supported_rates,
+                      sizeof(intel_dp->supported_rates));
 
-               if (i <= 0)
-                       DRM_ERROR("No rates in SUPPORTED_LINK_RATES");
+               return intel_dp->num_supported_rates;
        }
-       return i;
+       return 0;
 }
 
 static int
@@ -3754,10 +3746,23 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
            (intel_dp->dpcd[DP_EDP_CONFIGURATION_CAP] & DP_DPCD_DISPLAY_CONTROL_CAPABLE) &&
            (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_EDP_DPCD_REV, &rev, 1) == 1) &&
            (rev >= 0x03)) { /* eDp v1.4 or higher */
+               __le16 supported_rates[DP_MAX_SUPPORTED_RATES];
+               int i;
+
                intel_dp_dpcd_read_wake(&intel_dp->aux,
                                DP_SUPPORTED_LINK_RATES,
-                               intel_dp->supported_rates,
-                               sizeof(intel_dp->supported_rates));
+                               supported_rates,
+                               sizeof(supported_rates));
+
+               for (i = 0; i < ARRAY_SIZE(supported_rates); i++) {
+                       int val = le16_to_cpu(supported_rates[i]);
+
+                       if (val == 0)
+                               break;
+
+                       intel_dp->supported_rates[i] = val * 200;
+               }
+               intel_dp->num_supported_rates = i;
        }
        if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
              DP_DWN_STRM_PORT_PRESENT))

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c77128c..69c8437 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -627,7 +627,8 @@ struct intel_dp {
        uint8_t dpcd[DP_RECEIVER_CAP_SIZE];
        uint8_t psr_dpcd[EDP_PSR_RECEIVER_CAP_SIZE];
        uint8_t downstream_ports[DP_MAX_DOWNSTREAM_PORTS];
-       __le16 supported_rates[DP_MAX_SUPPORTED_RATES];
+       uint8_t num_supported_rates;
+       int supported_rates[DP_MAX_SUPPORTED_RATES];
        struct drm_dp_aux aux;
        uint8_t train_set[4];
        int panel_power_up_delay;