drm/radeon: unify bpc handling

We were already storing the bpc (bits per color) information
in radeon_crtc, so just use that everywhere rather than
calculating it everywhere we use it.  This also allows us
to change it in one place if we ever want to override it.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/atombios_crtc.c

@@ -559,7 +559,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 	u32 adjusted_clock = mode->clock;
 	int encoder_mode = atombios_get_encoder_mode(encoder);
 	u32 dp_clock = mode->clock;
-	int bpc = radeon_get_monitor_bpc(connector);
+	int bpc = radeon_crtc->bpc;
 	bool is_duallink = radeon_dig_monitor_is_duallink(encoder, mode->clock);
 
 	/* reset the pll flags */

drivers/gpu/drm/radeon/atombios_encoders.c

@@ -464,11 +464,12 @@ atombios_tv_setup(struct drm_encoder *encoder, int action)
 
 static u8 radeon_atom_get_bpc(struct drm_encoder *encoder)
 {
-	struct drm_connector *connector = radeon_get_connector_for_encoder(encoder);
 	int bpc = 8;
 
-	if (connector)
-		bpc = radeon_get_monitor_bpc(connector);
+	if (encoder->crtc) {
+		struct radeon_crtc *radeon_crtc = to_radeon_crtc(encoder->crtc);
+		bpc = radeon_crtc->bpc;
+	}
 
 	switch (bpc) {
 	case 0: