There is one instance of those registers for each DDI port.

Signed-off-by: Eugeni Dodonov <[email protected]>
---
 drivers/gpu/drm/i915/i915_reg.h |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3831fe7..2927460 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3914,4 +3914,27 @@
 #define DP_TP_STATUS_E                 0x64444
 #define  DP_TP_STATUS_AUTOTRAIN_DONE   (1<<12)
 
+/* DDI Buffer Control */
+#define DDI_BUF_CTL_A                          0x64000
+#define DDI_BUF_CTL_B                          0x64100
+#define DDI_BUF_CTL_C                          0x64200
+#define DDI_BUF_CTL_D                          0x64300
+#define DDI_BUF_CTL_E                          0x64400
+#define  DDI_BUF_CTL_ENABLE                    (1<<31)
+#define  DDI_BUF_EMP_400MV_0DB_HSW             (0<<24)   /* Sel0 */
+#define  DDI_BUF_EMP_400MV_3_5DB_HSW   (1<<24)   /* Sel1 */
+#define  DDI_BUF_EMP_400MV_6DB_HSW             (2<<24)   /* Sel2 */
+#define  DDI_BUF_EMP_400MV_9_5DB_HSW   (3<<24)   /* Sel3 */
+#define  DDI_BUF_EMP_600MV_0DB_HSW             (4<<24)   /* Sel4 */
+#define  DDI_BUF_EMP_600MV_3_5DB_HSW   (5<<24)   /* Sel5 */
+#define  DDI_BUF_EMP_600MV_6DB_HSW             (6<<24)   /* Sel6 */
+#define  DDI_BUF_EMP_800MV_0DB_HSW             (7<<24)   /* Sel7 */
+#define  DDI_BUF_EMP_800MV_3_5DB_HSW   (8<<24)   /* Sel8 */
+#define  DDI_BUF_EMP_MASK                              (0xf<<24)
+#define  DDI_BUF_IS_IDLE                               (1<<7)
+#define  DDI_PORT_WIDTH_X1                             (0<<1)
+#define  DDI_PORT_WIDTH_X2                             (1<<1)
+#define  DDI_PORT_WIDTH_X4                             (3<<1)
+#define  DDI_INIT_DISPLAY_DETECTED             (1<<0)
+
 #endif /* _I915_REG_H_ */
-- 
1.7.9.2

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