[PATCH 1/3] drm: Add Adaptive Sync SDP logging

[Mitul Golani]

Add structure representing Adaptive Sync Secondary Data
Packet (AS SDP). Also, add Adaptive Sync SDP logging in
drm_dp_helper.c to facilitate debugging.

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
---
 drivers/gpu/drm/display/drm_dp_helper.c | 15 +++++++++++++
 include/drm/display/drm_dp.h            |  1 +
 include/drm/display/drm_dp_helper.h     | 30 +++++++++++++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
index d72b6f9a352c..8e3bc971a0d2 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -2917,6 +2917,21 @@ void drm_dp_vsc_sdp_log(const char *level, struct device *dev,
 }
 EXPORT_SYMBOL(drm_dp_vsc_sdp_log);
 
+void drm_dp_as_sdp_log(const char *level, struct device *dev,
+		       const struct drm_dp_as_sdp *as_sdp)
+{
+#define DP_SDP_LOG(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)
+	DP_SDP_LOG("DP SDP: %s, revision %u, length %u\n", "AS_SDP",
+		   as_sdp->revision, as_sdp->length);
+	DP_SDP_LOG("	vmin: %d vmax: %d\n", as_sdp->vmin, as_sdp->vmax);
+	DP_SDP_LOG("    target_rr: %d\n", as_sdp->target_rr);
+	DP_SDP_LOG("    duration_incr_ms: %d\n", as_sdp->duration_incr_ms);
+	DP_SDP_LOG("    duration_decr_ms: %d\n", as_sdp->duration_decr_ms);
+	DP_SDP_LOG("    operation_mode: %d\n", as_sdp->operation_mode);
+#undef DP_SDP_LOG
+}
+EXPORT_SYMBOL(drm_dp_as_sdp_log);
+
 /**
  * drm_dp_get_pcon_max_frl_bw() - maximum frl supported by PCON
  * @dpcd: DisplayPort configuration data
diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h
index 83d2039c018b..19e9f274efbf 100644
--- a/include/drm/display/drm_dp.h
+++ b/include/drm/display/drm_dp.h
@@ -1578,6 +1578,7 @@ enum drm_dp_phy {
 #define DP_SDP_PPS			0x10 /* DP 1.4 */
 #define DP_SDP_VSC_EXT_VESA		0x20 /* DP 1.4 */
 #define DP_SDP_VSC_EXT_CEA		0x21 /* DP 1.4 */
+
 /* 0x80+ CEA-861 infoframe types */
 
 #define DP_SDP_AUDIO_INFOFRAME_HB2	0x1b
diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h
index 863b2e7add29..f5c34d4e350a 100644
--- a/include/drm/display/drm_dp_helper.h
+++ b/include/drm/display/drm_dp_helper.h
@@ -98,6 +98,36 @@ struct drm_dp_vsc_sdp {
 	enum dp_content_type content_type;
 };
 
+/**
+ * struct drm_dp_as_sdp - drm DP Adaptive Sync SDP
+ *
+ * This structure represents a DP AS SDP of drm
+ * It is based on DP 2.1 spec [Table 2-126:  Adaptive-Sync SDP Header Bytes] and
+ * [Table 2-127: Adaptive-Sync SDP Payload for DB0 through DB8]
+ *
+ * @sdp_type: secondary-data packet type
+ * @length: number of valid data bytes
+ * @vmin: minimum vtotal
+ * @vmax: maximum vtotal
+ * @duration_incr_ms: Successive frame duration increase
+ * @duration_decr_ms: Successive frame duration decrease
+ * @operation_mode: Adaptive Sync Operation Mode
+ */
+
+struct drm_dp_as_sdp {
+	unsigned char sdp_type;
+	unsigned char revision;
+	unsigned char length;
+	int vmin, vmax;
+	int target_rr;
+	int duration_incr_ms;
+	int duration_decr_ms;
+	int operation_mode;
+};
+
+void drm_dp_as_sdp_log(const char *level, struct device *dev,
+		       const struct drm_dp_as_sdp *async);
+
 void drm_dp_vsc_sdp_log(const char *level, struct device *dev,
 			const struct drm_dp_vsc_sdp *vsc);
 
-- 
2.25.1