[PATCH 3/8] drm/i915: Added SDP and VSC structures for handling PSR for eDP

[Rodrigo Vivi]

From: Shobhit Kumar <shobhit.kumar at intel.com>

Signed-off-by: Sateesh Kavuri <sateesh.kavuri at intel.com>

v2: Modified and corrected the structures to be more in line for
kernel coding guidelines and rebased the code on Paulo's DP patchset

Signed-off-by: Shobhit Kumar <shobhit.kumar at intel.com>

v3: removing unecessary identation at DP_RECEIVER_CAP_SIZE
v4: moving them to include/drm/drm_dp_helper.h and also already
    icluding EDP_PSR_RECEIVER_CAP_SIZE to add everything needed
    for PSR at once at drm_dp_helper.h

Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
---
 include/drm/drm_dp_helper.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index e8e1417..06c5060 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -343,12 +343,34 @@ u8 drm_dp_get_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE],
 					  int lane);
 
 #define DP_RECEIVER_CAP_SIZE	0xf
+#define EDP_PSR_RECEIVER_CAP_SIZE      2
+
 void drm_dp_link_train_clock_recovery_delay(u8 dpcd[DP_RECEIVER_CAP_SIZE]);
 void drm_dp_link_train_channel_eq_delay(u8 dpcd[DP_RECEIVER_CAP_SIZE]);
 
 u8 drm_dp_link_rate_to_bw_code(int link_rate);
 int drm_dp_bw_code_to_link_rate(u8 link_bw);
 
+/* SDP header as per eDP 1.3 spec, section 3.6 */
+struct edp_sdp_header {
+	u8 id;
+	u8 type;
+	u8 revision;
+	u8 valid_payload_bytes;
+} __attribute__((packed));
+
+/* SDP VSC header as per eDP 1.3 spec, section 3.6 */
+struct edp_vsc_psr {
+	struct edp_sdp_header sdp_header;
+	u8 DB1; /* 0 - PSR State; 1 - Update RFB; 2 - CRC Valid*/
+	u8 DB2; /* CRC value bits 7:0 of the R or Cr component */
+	u8 DB3; /* CRC value bits 15:8 of the R or Cr component */
+	u8 DB4; /* CRC value bits 7:0 of the G or Y component */
+	u8 DB5; /* CRC value bits 15:8 of the G or Y component */
+	u8 DB6; /* CRC value bits 7:0 of the B or Cb component */
+	u8 DB7; /* CRC value bits 15:8 of the B or Cb component */
+} __attribute__((packed));
+
 static inline int
 drm_dp_max_link_rate(u8 dpcd[DP_RECEIVER_CAP_SIZE])
 {
-- 
1.8.1.2