drm/radeon/kms/atom: add support for spread spectrum (v2)

Spread spectrum is a periodic disturbance added
to the feedback divider to change the pixel clock
periodically to reduce interference.

Only enabled on LVDS.

v2: add support for r4xx and fix DCE 3

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

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index b6868fbe7346..2ea5707c018c 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -260,6 +260,16 @@ struct radeon_encoder_int_tmds {
         struct radeon_tmds_pll tmds_pll[4];
 };
 
+/* spread spectrum */
+struct radeon_atom_ss {
+        uint16_t percentage;
+        uint8_t type;
+        uint8_t step;
+        uint8_t delay;
+        uint8_t range;
+        uint8_t refdiv;
+};
+
 struct radeon_encoder_atom_dig {
         /* atom dig */
         bool coherent_mode;
@@ -267,6 +277,7 @@ struct radeon_encoder_atom_dig {
         /* atom lvds */
         uint32_t lvds_misc;
         uint16_t panel_pwr_delay;
+        struct radeon_atom_ss *ss;
         /* panel mode */
         struct drm_display_mode native_mode;
 };