drm/radeon/kms: cleanup atombios_adjust_pll()

The logic was messy and hard to follow.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/atombios_crtc.c

@@ -638,20 +638,17 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 				if (ss_enabled && ss->percentage)
 					args.v3.sInput.ucDispPllConfig |=
 						DISPPLL_CONFIG_SS_ENABLE;
-				if (radeon_encoder->devices & (ATOM_DEVICE_DFP_SUPPORT) ||
-				    radeon_encoder_is_dp_bridge(encoder)) {
-					struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 				if (encoder_mode == ATOM_ENCODER_MODE_DP) {
 					args.v3.sInput.ucDispPllConfig |=
 						DISPPLL_CONFIG_COHERENT_MODE;
 					/* 16200 or 27000 */
 					args.v3.sInput.usPixelClock = cpu_to_le16(dp_clock / 10);
-					} else {
-						if (encoder_mode == ATOM_ENCODER_MODE_HDMI) {
+				} else if (radeon_encoder->devices & (ATOM_DEVICE_DFP_SUPPORT)) {
+					struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
+					if (encoder_mode == ATOM_ENCODER_MODE_HDMI)
 						/* deep color support */
 						args.v3.sInput.usPixelClock =
 							cpu_to_le16((mode->clock * bpc / 8) / 10);
-						}
 					if (dig->coherent_mode)
 						args.v3.sInput.ucDispPllConfig |=
 							DISPPLL_CONFIG_COHERENT_MODE;
@@ -659,18 +656,6 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 						args.v3.sInput.ucDispPllConfig |=
 							DISPPLL_CONFIG_DUAL_LINK;
 				}
-				} else if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
-					if (encoder_mode == ATOM_ENCODER_MODE_DP) {
-						args.v3.sInput.ucDispPllConfig |=
-							DISPPLL_CONFIG_COHERENT_MODE;
-						/* 16200 or 27000 */
-						args.v3.sInput.usPixelClock = cpu_to_le16(dp_clock / 10);
-					} else if (encoder_mode != ATOM_ENCODER_MODE_LVDS) {
-						if (mode->clock > 165000)
-							args.v3.sInput.ucDispPllConfig |=
-								DISPPLL_CONFIG_DUAL_LINK;
-					}
-				}
 				if (radeon_encoder_is_dp_bridge(encoder)) {
 					struct drm_encoder *ext_encoder = radeon_atom_get_external_encoder(encoder);
 					struct radeon_encoder *ext_radeon_encoder = to_radeon_encoder(ext_encoder);