drm/kms/radeon: pick digitial encoders smarter. (v3)

booting a Lenovo W500 with LVDS + DP outputs showed up a TODO we had
on our list, to pick a correct digital encoder block. The LVTMA
encoder requires the second digital encoder, all others can use any
encoder at all.

This fixes the digital encoder selection logic to enable LVDS/DP combos
to work okay.

V2: fix silly addition of connector dig_block and cleanup the other
places in the code that pick the encoder.

V3: rename to dig_encoder and clean up further - also fix
the picking algorithm.

tested on Lenovo W500 + desktop 3650 cards.

Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 99 insertions, 89 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 9c023d25aad..71060114d5d 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -596,21 +596,14 @@ void dp_link_train(struct drm_encoder *encoder,
                 return;
         dig_connector = radeon_connector->con_priv;
 
-        if (ASIC_IS_DCE32(rdev)) {
-                if (dig->dig_block)
-                        enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
-                else
-                        enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
-                if (dig_connector->linkb)
-                        enc_id |= ATOM_DP_CONFIG_LINK_B;
-                else
-                        enc_id |= ATOM_DP_CONFIG_LINK_A;
-        } else {
-                if (dig_connector->linkb)
-                        enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER | ATOM_DP_CONFIG_LINK_B;
-                else
-                        enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER | ATOM_DP_CONFIG_LINK_A;
-        }
+        if (dig->dig_encoder)
+                enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
+        else
+                enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
+        if (dig_connector->linkb)
+                enc_id |= ATOM_DP_CONFIG_LINK_B;
+        else
+                enc_id |= ATOM_DP_CONFIG_LINK_A;
 
         memset(link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
         if (dig_connector->dp_clock == 270000)
diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 10746c9c805..3c91724457c 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -156,6 +156,26 @@ radeon_get_encoder_id(struct drm_device *dev, uint32_t supported_device, uint8_t
         return ret;
 }
 
+static inline bool radeon_encoder_is_digital(struct drm_encoder *encoder)
+{
+        struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+        switch (radeon_encoder->encoder_id) {
+        case ENCODER_OBJECT_ID_INTERNAL_LVDS:
+        case ENCODER_OBJECT_ID_INTERNAL_TMDS1:
+        case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:
+        case ENCODER_OBJECT_ID_INTERNAL_LVTM1:
+        case ENCODER_OBJECT_ID_INTERNAL_DVO1:
+        case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DVO1:
+        case ENCODER_OBJECT_ID_INTERNAL_DDI:
+        case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
+        case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
+        case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
+        case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
+                return true;
+        default:
+                return false;
+        }
+}
 void
 radeon_link_encoder_connector(struct drm_device *dev)
 {
@@ -676,31 +696,11 @@ atombios_dig_encoder_setup(struct drm_encoder *encoder, int action)
 
         memset(&args, 0, sizeof(args));
 
-        if (ASIC_IS_DCE32(rdev)) {
-                if (dig->dig_block)
-                        index = GetIndexIntoMasterTable(COMMAND, DIG2EncoderControl);
-                else
-                        index = GetIndexIntoMasterTable(COMMAND, DIG1EncoderControl);
-                num = dig->dig_block + 1;
-        } else {
-                switch (radeon_encoder->encoder_id) {
-                case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
-                        /* XXX doesn't really matter which dig encoder we pick as long as it's
-                         * not already in use
-                         */
-                        if (dig_connector->linkb)
-                                index = GetIndexIntoMasterTable(COMMAND, DIG2EncoderControl);
-                        else
-                                index = GetIndexIntoMasterTable(COMMAND, DIG1EncoderControl);
-                        num = 1;
-                        break;
-                case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
-                        /* Only dig2 encoder can drive LVTMA */
-                        index = GetIndexIntoMasterTable(COMMAND, DIG2EncoderControl);
-                        num = 2;
-                        break;
-                }
-        }
+        if (dig->dig_encoder)
+                index = GetIndexIntoMasterTable(COMMAND, DIG2EncoderControl);
+        else
+                index = GetIndexIntoMasterTable(COMMAND, DIG1EncoderControl);
+        num = dig->dig_encoder + 1;
 
         atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev);
 
@@ -822,7 +822,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                         args.v1.usPixelClock = cpu_to_le16(radeon_encoder->pixel_clock / 10);
         }
         if (ASIC_IS_DCE32(rdev)) {
-                if (dig->dig_block)
+                if (dig->dig_encoder == 1)
                         args.v2.acConfig.ucEncoderSel = 1;
                 if (dig_connector->linkb)
                         args.v2.acConfig.ucLinkSel = 1;
@@ -849,17 +849,16 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                                 args.v2.acConfig.fCoherentMode = 1;
                 }
         } else {
+
                 args.v1.ucConfig = ATOM_TRANSMITTER_CONFIG_CLKSRC_PPLL;
 
+                if (dig->dig_encoder)
+                        args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_DIG2_ENCODER;
+                else
+                        args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_DIG1_ENCODER;
+
                 switch (radeon_encoder->encoder_id) {
                 case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
-                        /* XXX doesn't really matter which dig encoder we pick as long as it's
-                         * not already in use
-                         */
-                        if (dig_connector->linkb)
-                                args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_DIG2_ENCODER;
-                        else
-                                args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_DIG1_ENCODER;
                         if (rdev->flags & RADEON_IS_IGP) {
                                 if (radeon_encoder->pixel_clock > 165000) {
                                         if (dig_connector->igp_lane_info & 0x3)
@@ -878,10 +877,6 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                                 }
                         }
                         break;
-                case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
-                        /* Only dig2 encoder can drive LVTMA */
-                        args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_DIG2_ENCODER;
-                        break;
                 }
 
                 if (radeon_encoder->pixel_clock > 165000)
@@ -1046,6 +1041,7 @@ atombios_set_encoder_crtc_source(struct drm_encoder *encoder)
         union crtc_sourc_param args;
         int index = GetIndexIntoMasterTable(COMMAND, SelectCRTC_Source);
         uint8_t frev, crev;
+        struct radeon_encoder_atom_dig *dig;
 
         memset(&args, 0, sizeof(args));
 
@@ -1109,40 +1105,16 @@ atombios_set_encoder_crtc_source(struct drm_encoder *encoder)
                         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
                         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
                         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
-                                if (ASIC_IS_DCE32(rdev)) {
-                                        if (radeon_crtc->crtc_id)
-                                                args.v2.ucEncoderID = ASIC_INT_DIG2_ENCODER_ID;
-                                        else
-                                                args.v2.ucEncoderID = ASIC_INT_DIG1_ENCODER_ID;
-                                } else {
-                                        struct drm_connector *connector;
-                                        struct radeon_connector *radeon_connector;
-                                        struct radeon_connector_atom_dig *dig_connector;
-
-                                        connector = radeon_get_connector_for_encoder(encoder);
-                                        if (!connector)
-                                                return;
-                                        radeon_connector = to_radeon_connector(connector);
-                                        if (!radeon_connector->con_priv)
-                                                return;
-                                        dig_connector = radeon_connector->con_priv;
-
-                                        /* XXX doesn't really matter which dig encoder we pick as long as it's
-                                         * not already in use
-                                         */
-                                        if (dig_connector->linkb)
-                                                args.v2.ucEncoderID = ASIC_INT_DIG2_ENCODER_ID;
-                                        else
-                                                args.v2.ucEncoderID = ASIC_INT_DIG1_ENCODER_ID;
-                                }
+                        case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
+                                dig = radeon_encoder->enc_priv;
+                                if (dig->dig_encoder)
+                                        args.v2.ucEncoderID = ASIC_INT_DIG2_ENCODER_ID;
+                                else
+                                        args.v2.ucEncoderID = ASIC_INT_DIG1_ENCODER_ID;
                                 break;
                         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DVO1:
                                 args.v2.ucEncoderID = ASIC_INT_DVO_ENCODER_ID;
                                 break;
-                        case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
-                                /* Only dig2 encoder can drive LVTMA */
-                                args.v2.ucEncoderID = ASIC_INT_DIG2_ENCODER_ID;
-                                break;
                         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DAC1:
                                 if (radeon_encoder->active_device & (ATOM_DEVICE_TV_SUPPORT))
                                         args.v2.ucEncoderID = ASIC_INT_TV_ENCODER_ID;
@@ -1202,6 +1174,47 @@ atombios_apply_encoder_quirks(struct drm_encoder *encoder,
         }
 }
 
+static int radeon_atom_pick_dig_encoder(struct drm_encoder *encoder)
+{
+        struct drm_device *dev = encoder->dev;
+        struct radeon_device *rdev = dev->dev_private;
+        struct radeon_crtc *radeon_crtc = to_radeon_crtc(encoder->crtc);
+        struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+        struct drm_encoder *test_encoder;
+        struct radeon_encoder_atom_dig *dig;
+        uint32_t dig_enc_in_use = 0;
+        /* on DCE32 and encoder can driver any block so just crtc id */
+        if (ASIC_IS_DCE32(rdev)) {
+                return radeon_crtc->crtc_id;
+        }
+
+        /* on DCE3 - LVTMA can only be driven by DIGB */
+        list_for_each_entry(test_encoder, &dev->mode_config.encoder_list, head) {
+                struct radeon_encoder *radeon_test_encoder;
+
+                if (encoder == test_encoder)
+                        continue;
+
+                if (!radeon_encoder_is_digital(test_encoder))
+                        continue;
+
+                radeon_test_encoder = to_radeon_encoder(test_encoder);
+                dig = radeon_test_encoder->enc_priv;
+
+                if (dig->dig_encoder >= 0)
+                        dig_enc_in_use |= (1 << dig->dig_encoder);
+        }
+
+        if (radeon_encoder->encoder_id == ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA) {
+                if (dig_enc_in_use & 0x2)
+                        DRM_ERROR("LVDS required digital encoder 2 but it was in use - stealing\n");
+                return 1;
+        }
+        if (!(dig_enc_in_use & 1))
+                return 0;
+        return 1;
+}
+
 static void
 radeon_atom_encoder_mode_set(struct drm_encoder *encoder,
                              struct drm_display_mode *mode,
@@ -1214,12 +1227,9 @@ radeon_atom_encoder_mode_set(struct drm_encoder *encoder,
 
         if (radeon_encoder->active_device &
             (ATOM_DEVICE_DFP_SUPPORT | ATOM_DEVICE_LCD_SUPPORT)) {
-                if (radeon_encoder->enc_priv) {
-                        struct radeon_encoder_atom_dig *dig;
-
-                        dig = radeon_encoder->enc_priv;
-                        dig->dig_block = radeon_crtc->crtc_id;
-                }
+                struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
+                if (dig)
+                        dig->dig_encoder = radeon_atom_pick_dig_encoder(encoder);
         }
         radeon_encoder->pixel_clock = adjusted_mode->clock;
 
@@ -1379,7 +1389,13 @@ static void radeon_atom_encoder_commit(struct drm_encoder *encoder)
 static void radeon_atom_encoder_disable(struct drm_encoder *encoder)
 {
         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+        struct radeon_encoder_atom_dig *dig;
         radeon_atom_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
+
+        if (radeon_encoder_is_digital(encoder)) {
+                dig = radeon_encoder->enc_priv;
+                dig->dig_encoder = -1;
+        }
         radeon_encoder->active_device = 0;
 }
 
@@ -1436,6 +1452,7 @@ radeon_atombios_set_dig_info(struct radeon_encoder *radeon_encoder)
 
         /* coherent mode by default */
         dig->coherent_mode = true;
+        dig->dig_encoder = -1;
 
         return dig;
 }
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 96b851f92f4..e81b2aeb6a8 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -299,7 +299,7 @@ struct radeon_atom_ss {
 struct radeon_encoder_atom_dig {
         /* atom dig */
         bool coherent_mode;
-        int dig_block;
+        int dig_encoder; /* -1 disabled, 0 DIGA, 1 DIGB */
         /* atom lvds */
         uint32_t lvds_misc;
         uint16_t panel_pwr_delay;