drm/radeon/kms: add support for external tmds on legacy boards

This enables initialization of external tmds chips on pre-atom
and mac systems.  Macs are untested.  Also, some macs have single
link tmds chips while others have dual link tmds chips.  We need
to figure out which ones have which.

This gets external TMDS working on my RS485 and RV380.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 40 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
index 00382122869b..2670a9e6502f 100644
--- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
@@ -697,6 +697,8 @@ static void radeon_legacy_tmds_ext_mode_set(struct drm_encoder *encoder,
 			/*if (mode->clock > 165000)
 			  fp2_gen_cntl |= R300_FP2_DVO_DUAL_CHANNEL_EN;*/
 		}
+		if (!radeon_combios_external_tmds_setup(encoder))
+			radeon_external_tmds_setup(encoder);
 	}
 
 	if (radeon_crtc->crtc_id == 0) {
@@ -724,6 +726,19 @@ static void radeon_legacy_tmds_ext_mode_set(struct drm_encoder *encoder,
 		radeon_combios_encoder_crtc_scratch_regs(encoder, radeon_crtc->crtc_id);
 }
 
+static void radeon_ext_tmds_enc_destroy(struct drm_encoder *encoder)
+{
+	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+	struct radeon_encoder_ext_tmds *tmds = radeon_encoder->enc_priv;
+	if (tmds) {
+		if (tmds->i2c_bus)
+			radeon_i2c_destroy(tmds->i2c_bus);
+	}
+	kfree(radeon_encoder->enc_priv);
+	drm_encoder_cleanup(encoder);
+	kfree(radeon_encoder);
+}
+
 static const struct drm_encoder_helper_funcs radeon_legacy_tmds_ext_helper_funcs = {
 	.dpms = radeon_legacy_tmds_ext_dpms,
 	.mode_fixup = radeon_legacy_tmds_ext_mode_fixup,
@@ -735,7 +750,7 @@ static const struct drm_encoder_helper_funcs radeon_legacy_tmds_ext_helper_funcs
 
 
 static const struct drm_encoder_funcs radeon_legacy_tmds_ext_enc_funcs = {
-	.destroy = radeon_enc_destroy,
+	.destroy = radeon_ext_tmds_enc_destroy,
 };
 
 static bool radeon_legacy_tv_dac_mode_fixup(struct drm_encoder *encoder,
@@ -1302,6 +1317,29 @@ static struct radeon_encoder_int_tmds *radeon_legacy_get_tmds_info(struct radeon
 	return tmds;
 }
 
+static struct radeon_encoder_ext_tmds *radeon_legacy_get_ext_tmds_info(struct radeon_encoder *encoder)
+{
+	struct drm_device *dev = encoder->base.dev;
+	struct radeon_device *rdev = dev->dev_private;
+	struct radeon_encoder_ext_tmds *tmds = NULL;
+	bool ret;
+
+	if (rdev->is_atom_bios)
+		return NULL;
+
+	tmds = kzalloc(sizeof(struct radeon_encoder_ext_tmds), GFP_KERNEL);
+
+	if (!tmds)
+		return NULL;
+
+	ret = radeon_legacy_get_ext_tmds_info_from_combios(encoder, tmds);
+
+	if (ret == false)
+		radeon_legacy_get_ext_tmds_info_from_table(encoder, tmds);
+
+	return tmds;
+}
+
 void
 radeon_add_legacy_encoder(struct drm_device *dev, uint32_t encoder_id, uint32_t supported_device)
 {
@@ -1373,7 +1411,7 @@ radeon_add_legacy_encoder(struct drm_device *dev, uint32_t encoder_id, uint32_t
 		drm_encoder_init(dev, encoder, &radeon_legacy_tmds_ext_enc_funcs, DRM_MODE_ENCODER_TMDS);
 		drm_encoder_helper_add(encoder, &radeon_legacy_tmds_ext_helper_funcs);
 		if (!rdev->is_atom_bios)
-			radeon_combios_get_ext_tmds_info(radeon_encoder);
+			radeon_encoder->enc_priv = radeon_legacy_get_ext_tmds_info(radeon_encoder);
 		break;
 	}
 }