drm/radeon/kms: refine TMDS dual link checks

HDMI 1.3 defines single link clocks up to 340 Mhz.
Refine the current dual link checks to only enable
dual link for DVI > 165 Mhz or HDMI > 340 Mhz if the
hw supports HDMI 1.3 (DCE3+).

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=44755

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

4 files changed, 105 insertions, 37 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 807b89b4933..891935271d3 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -518,6 +518,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
         int encoder_mode = 0;
         u32 dp_clock = mode->clock;
         int bpc = 8;
+        bool is_duallink = false;
 
         /* reset the pll flags */
         pll->flags = 0;
@@ -552,6 +553,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                         if (connector && connector->display_info.bpc)
                                 bpc = connector->display_info.bpc;
                         encoder_mode = atombios_get_encoder_mode(encoder);
+                        is_duallink = radeon_dig_monitor_is_duallink(encoder, mode->clock);
                         if ((radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT | ATOM_DEVICE_DFP_SUPPORT)) ||
                             (radeon_encoder_get_dp_bridge_encoder_id(encoder) != ENCODER_OBJECT_ID_NONE)) {
                                 if (connector) {
@@ -647,7 +649,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                                         if (dig->coherent_mode)
                                                 args.v3.sInput.ucDispPllConfig |=
                                                         DISPPLL_CONFIG_COHERENT_MODE;
-                                        if (mode->clock > 165000)
+                                        if (is_duallink)
                                                 args.v3.sInput.ucDispPllConfig |=
                                                         DISPPLL_CONFIG_DUAL_LINK;
                                 }
diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index f2f14a20a49..b88c4608731 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -57,22 +57,6 @@ static inline bool radeon_encoder_is_digital(struct drm_encoder *encoder)
         }
 }
 
-static struct drm_connector *
-radeon_get_connector_for_encoder_init(struct drm_encoder *encoder)
-{
-        struct drm_device *dev = encoder->dev;
-        struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
-        struct drm_connector *connector;
-        struct radeon_connector *radeon_connector;
-
-        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-                radeon_connector = to_radeon_connector(connector);
-                if (radeon_encoder->devices & radeon_connector->devices)
-                        return connector;
-        }
-        return NULL;
-}
-
 static bool radeon_atom_mode_fixup(struct drm_encoder *encoder,
                                    struct drm_display_mode *mode,
                                    struct drm_display_mode *adjusted_mode)
@@ -253,7 +237,7 @@ atombios_dvo_setup(struct drm_encoder *encoder, int action)
                         /* R4xx, R5xx */
                         args.ext_tmds.sXTmdsEncoder.ucEnable = action;
 
-                        if (radeon_encoder->pixel_clock > 165000)
+                        if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.ext_tmds.sXTmdsEncoder.ucMisc |= PANEL_ENCODER_MISC_DUAL;
 
                         args.ext_tmds.sXTmdsEncoder.ucMisc |= ATOM_PANEL_MISC_888RGB;
@@ -265,7 +249,7 @@ atombios_dvo_setup(struct drm_encoder *encoder, int action)
                         /* DFP1, CRT1, TV1 depending on the type of port */
                         args.dvo.sDVOEncoder.ucDeviceType = ATOM_DEVICE_DFP1_INDEX;
 
-                        if (radeon_encoder->pixel_clock > 165000)
+                        if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.dvo.sDVOEncoder.usDevAttr.sDigAttrib.ucAttribute |= PANEL_ENCODER_MISC_DUAL;
                         break;
                 case 3:
@@ -349,7 +333,7 @@ atombios_digital_setup(struct drm_encoder *encoder, int action)
                         } else {
                                 if (dig->linkb)
                                         args.v1.ucMisc |= PANEL_ENCODER_MISC_TMDS_LINKB;
-                                if (radeon_encoder->pixel_clock > 165000)
+                                if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v1.ucMisc |= PANEL_ENCODER_MISC_DUAL;
                                 /*if (pScrn->rgbBits == 8) */
                                 args.v1.ucMisc |= ATOM_PANEL_MISC_888RGB;
@@ -388,7 +372,7 @@ atombios_digital_setup(struct drm_encoder *encoder, int action)
                         } else {
                                 if (dig->linkb)
                                         args.v2.ucMisc |= PANEL_ENCODER_MISC_TMDS_LINKB;
-                                if (radeon_encoder->pixel_clock > 165000)
+                                if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v2.ucMisc |= PANEL_ENCODER_MISC_DUAL;
                         }
                         break;
@@ -587,7 +571,7 @@ atombios_dig_encoder_setup(struct drm_encoder *encoder, int action, int panel_mo
 
                         if (ENCODER_MODE_IS_DP(args.v1.ucEncoderMode))
                                 args.v1.ucLaneNum = dp_lane_count;
-                        else if (radeon_encoder->pixel_clock > 165000)
+                        else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.v1.ucLaneNum = 8;
                         else
                                 args.v1.ucLaneNum = 4;
@@ -622,7 +606,7 @@ atombios_dig_encoder_setup(struct drm_encoder *encoder, int action, int panel_mo
 
                         if (ENCODER_MODE_IS_DP(args.v1.ucEncoderMode))
                                 args.v3.ucLaneNum = dp_lane_count;
-                        else if (radeon_encoder->pixel_clock > 165000)
+                        else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.v3.ucLaneNum = 8;
                         else
                                 args.v3.ucLaneNum = 4;
@@ -662,7 +646,7 @@ atombios_dig_encoder_setup(struct drm_encoder *encoder, int action, int panel_mo
 
                         if (ENCODER_MODE_IS_DP(args.v1.ucEncoderMode))
                                 args.v4.ucLaneNum = dp_lane_count;
-                        else if (radeon_encoder->pixel_clock > 165000)
+                        else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.v4.ucLaneNum = 8;
                         else
                                 args.v4.ucLaneNum = 4;
@@ -806,7 +790,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                                 if (is_dp)
                                         args.v1.usPixelClock =
                                                 cpu_to_le16(dp_clock / 10);
-                                else if (radeon_encoder->pixel_clock > 165000)
+                                else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v1.usPixelClock = cpu_to_le16((radeon_encoder->pixel_clock / 2) / 10);
                                 else
                                         args.v1.usPixelClock = cpu_to_le16(radeon_encoder->pixel_clock / 10);
@@ -821,7 +805,8 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
 
                         if ((rdev->flags & RADEON_IS_IGP) &&
                             (radeon_encoder->encoder_id == ENCODER_OBJECT_ID_INTERNAL_UNIPHY)) {
-                                if (is_dp || (radeon_encoder->pixel_clock <= 165000)) {
+                                if (is_dp ||
+                                    !radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock)) {
                                         if (igp_lane_info & 0x1)
                                                 args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_LANE_0_3;
                                         else if (igp_lane_info & 0x2)
@@ -848,7 +833,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                         else if (radeon_encoder->devices & (ATOM_DEVICE_DFP_SUPPORT)) {
                                 if (dig->coherent_mode)
                                         args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_COHERENT;
-                                if (radeon_encoder->pixel_clock > 165000)
+                                if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_8LANE_LINK;
                         }
                         break;
@@ -863,7 +848,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                                 if (is_dp)
                                         args.v2.usPixelClock =
                                                 cpu_to_le16(dp_clock / 10);
-                                else if (radeon_encoder->pixel_clock > 165000)
+                                else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v2.usPixelClock = cpu_to_le16((radeon_encoder->pixel_clock / 2) / 10);
                                 else
                                         args.v2.usPixelClock = cpu_to_le16(radeon_encoder->pixel_clock / 10);
@@ -891,7 +876,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                         } else if (radeon_encoder->devices & (ATOM_DEVICE_DFP_SUPPORT)) {
                                 if (dig->coherent_mode)
                                         args.v2.acConfig.fCoherentMode = 1;
-                                if (radeon_encoder->pixel_clock > 165000)
+                                if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v2.acConfig.fDualLinkConnector = 1;
                         }
                         break;
@@ -906,7 +891,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                                 if (is_dp)
                                         args.v3.usPixelClock =
                                                 cpu_to_le16(dp_clock / 10);
-                                else if (radeon_encoder->pixel_clock > 165000)
+                                else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v3.usPixelClock = cpu_to_le16((radeon_encoder->pixel_clock / 2) / 10);
                                 else
                                         args.v3.usPixelClock = cpu_to_le16(radeon_encoder->pixel_clock / 10);
@@ -914,7 +899,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
 
                         if (is_dp)
                                 args.v3.ucLaneNum = dp_lane_count;
-                        else if (radeon_encoder->pixel_clock > 165000)
+                        else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.v3.ucLaneNum = 8;
                         else
                                 args.v3.ucLaneNum = 4;
@@ -951,7 +936,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                         else if (radeon_encoder->devices & (ATOM_DEVICE_DFP_SUPPORT)) {
                                 if (dig->coherent_mode)
                                         args.v3.acConfig.fCoherentMode = 1;
-                                if (radeon_encoder->pixel_clock > 165000)
+                                if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v3.acConfig.fDualLinkConnector = 1;
                         }
                         break;
@@ -966,7 +951,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                                 if (is_dp)
                                         args.v4.usPixelClock =
                                                 cpu_to_le16(dp_clock / 10);
-                                else if (radeon_encoder->pixel_clock > 165000)
+                                else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v4.usPixelClock = cpu_to_le16((radeon_encoder->pixel_clock / 2) / 10);
                                 else
                                         args.v4.usPixelClock = cpu_to_le16(radeon_encoder->pixel_clock / 10);
@@ -974,7 +959,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
 
                         if (is_dp)
                                 args.v4.ucLaneNum = dp_lane_count;
-                        else if (radeon_encoder->pixel_clock > 165000)
+                        else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.v4.ucLaneNum = 8;
                         else
                                 args.v4.ucLaneNum = 4;
@@ -1014,7 +999,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                         else if (radeon_encoder->devices & (ATOM_DEVICE_DFP_SUPPORT)) {
                                 if (dig->coherent_mode)
                                         args.v4.acConfig.fCoherentMode = 1;
-                                if (radeon_encoder->pixel_clock > 165000)
+                                if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                         args.v4.acConfig.fDualLinkConnector = 1;
                         }
                         break;
@@ -1137,7 +1122,7 @@ atombios_external_encoder_setup(struct drm_encoder *encoder,
                                 if (dp_clock == 270000)
                                         args.v1.sDigEncoder.ucConfig |= ATOM_ENCODER_CONFIG_DPLINKRATE_2_70GHZ;
                                 args.v1.sDigEncoder.ucLaneNum = dp_lane_count;
-                        } else if (radeon_encoder->pixel_clock > 165000)
+                        } else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.v1.sDigEncoder.ucLaneNum = 8;
                         else
                                 args.v1.sDigEncoder.ucLaneNum = 4;
@@ -1156,7 +1141,7 @@ atombios_external_encoder_setup(struct drm_encoder *encoder,
                                 else if (dp_clock == 540000)
                                         args.v3.sExtEncoder.ucConfig |= EXTERNAL_ENCODER_CONFIG_V3_DPLINKRATE_5_40GHZ;
                                 args.v3.sExtEncoder.ucLaneNum = dp_lane_count;
-                        } else if (radeon_encoder->pixel_clock > 165000)
+                        } else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
                                 args.v3.sExtEncoder.ucLaneNum = 8;
                         else
                                 args.v3.sExtEncoder.ucLaneNum = 4;
diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 4b27efa4405..9419c51bcf5 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -202,6 +202,22 @@ radeon_get_connector_for_encoder(struct drm_encoder *encoder)
         return NULL;
 }
 
+struct drm_connector *
+radeon_get_connector_for_encoder_init(struct drm_encoder *encoder)
+{
+        struct drm_device *dev = encoder->dev;
+        struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+        struct drm_connector *connector;
+        struct radeon_connector *radeon_connector;
+
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                radeon_connector = to_radeon_connector(connector);
+                if (radeon_encoder->devices & radeon_connector->devices)
+                        return connector;
+        }
+        return NULL;
+}
+
 struct drm_encoder *radeon_get_external_encoder(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
@@ -288,3 +304,64 @@ void radeon_panel_mode_fixup(struct drm_encoder *encoder,
 
 }
 
+bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
+                                    u32 pixel_clock)
+{
+        struct drm_device *dev = encoder->dev;
+        struct radeon_device *rdev = dev->dev_private;
+        struct drm_connector *connector;
+        struct radeon_connector *radeon_connector;
+        struct radeon_connector_atom_dig *dig_connector;
+
+        connector = radeon_get_connector_for_encoder(encoder);
+        /* if we don't have an active device yet, just use one of
+         * the connectors tied to the encoder.
+         */
+        if (!connector)
+                connector = radeon_get_connector_for_encoder_init(encoder);
+        radeon_connector = to_radeon_connector(connector);
+
+        switch (connector->connector_type) {
+        case DRM_MODE_CONNECTOR_DVII:
+        case DRM_MODE_CONNECTOR_HDMIB:
+                if (radeon_connector->use_digital) {
+                        /* HDMI 1.3 supports up to 340 Mhz over single link */
+                        if (ASIC_IS_DCE3(rdev) && drm_detect_hdmi_monitor(radeon_connector->edid)) {
+                                if (pixel_clock > 340000)
+                                        return true;
+                                else
+                                        return false;
+                        } else {
+                                if (pixel_clock > 165000)
+                                        return true;
+                                else
+                                        return false;
+                        }
+                } else
+                        return false;
+        case DRM_MODE_CONNECTOR_DVID:
+        case DRM_MODE_CONNECTOR_HDMIA:
+        case DRM_MODE_CONNECTOR_DisplayPort:
+                dig_connector = radeon_connector->con_priv;
+                if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
+                    (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP))
+                        return false;
+                else {
+                        /* HDMI 1.3 supports up to 340 Mhz over single link */
+                        if (ASIC_IS_DCE3(rdev) && drm_detect_hdmi_monitor(radeon_connector->edid)) {
+                                if (pixel_clock > 340000)
+                                        return true;
+                                else
+                                        return false;
+                        } else {
+                                if (pixel_clock > 165000)
+                                        return true;
+                                else
+                                        return false;
+                        }
+                }
+        default:
+                return false;
+        }
+}
+
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index d34dcb6ac38..4330e325357 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -467,6 +467,10 @@ radeon_atombios_get_tv_info(struct radeon_device *rdev);
 
 extern struct drm_connector *
 radeon_get_connector_for_encoder(struct drm_encoder *encoder);
+extern struct drm_connector *
+radeon_get_connector_for_encoder_init(struct drm_encoder *encoder);
+extern bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
+                                    u32 pixel_clock);
 
 extern u16 radeon_encoder_get_dp_bridge_encoder_id(struct drm_encoder *encoder);
 extern u16 radeon_connector_encoder_get_dp_bridge_encoder_id(struct drm_connector *connector);