[PATCH 3/9] drm/i915: Added SDP and VSC structures for handling PSR for eDP

[Rodrigo Vivi <rodrigo.vivi@gmail.com>]

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

Signed-off-by: Sateesh Kavuri <sateesh.kavuri@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@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@gmail.com>
---
 include/drm/drm_dp_helper.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index e8e1417..e9b7c4b 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -343,12 +343,41 @@ 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 : 5;   	    /* Bits 0:4 */
+	u8 rsvd1    : 3;   	    /* Bits 5:7 */
+	u8 valid_payload_bytes : 5; /* Bits 0:4 */
+	u8 rsvd2	       : 3; /* Bits 5:7 */
+} __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 unused;
+	u8 psr_state  : 1; 	/* Bit 0 */
+	u8 update_rfb : 1;	/* Bit 1 */
+	u8 valid_crc  : 1;	/* Bit 2 */
+	u8 reserved1  : 5;	/* Bits 3:7 */
+	u8 crc_r_lower;
+	u8 crc_r_higher;
+	u8 crc_g_lower;
+	u8 crc_g_higher;
+	u8 crc_b_lower;
+	u8 crc_b_higher;
+	u8 reserved2[24];
+} __attribute__((packed));
+
 static inline int
 drm_dp_max_link_rate(u8 dpcd[DP_RECEIVER_CAP_SIZE])
 {
-- 
1.7.11.7