Re: [PATCH v12 2/8] drm: Add Adaptive Sync SDP logging

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On 2/28/2024 8:08 PM, Mitul Golani wrote:
Add structure representing Adaptive Sync Secondary Data Packet (AS SDP).
Also, add Adaptive Sync SDP logging in drm_dp_helper.c to facilitate
debugging.

--v2:
- Update logging. [Jani, Ankit]
- Use 'as_sdp' instead of 'async' [Ankit]
- Correct define placeholders to where they are actually used. [Jani]
- Update members in 'as_sdp' structure to make it uniform. [Jani]

--v3:
- Added changes to dri-devel mailing list. No code changes.

--v4:
- Instead of directly using operation mode, use an enum to accommodate
all operation modes (Ankit).

--v5:
Nit-pick changes to commit message.

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@xxxxxxxxx>
---
  drivers/gpu/drm/display/drm_dp_helper.c       | 12 +++++++
  .../drm/i915/display/intel_crtc_state_dump.c  | 12 +++++++
  .../drm/i915/display/intel_display_types.h    |  1 +
  include/drm/display/drm_dp.h                  |  9 +++++
  include/drm/display/drm_dp_helper.h           | 33 +++++++++++++++++++
  5 files changed, 67 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
index f94c04db7187..b1459ac92aea 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -2913,6 +2913,18 @@ void drm_dp_vsc_sdp_log(struct drm_printer *p, const struct drm_dp_vsc_sdp *vsc)
  }
  EXPORT_SYMBOL(drm_dp_vsc_sdp_log);
+void drm_dp_as_sdp_log(struct drm_printer *p, const struct drm_dp_as_sdp *as_sdp)
+{
+	drm_printf(p, "DP SDP: AS_SDP, revision %u, length %u\n",
+		   as_sdp->revision, as_sdp->length);
+	drm_printf(p, "    vtotal: %d\n", as_sdp->vtotal);
+	drm_printf(p, "    target_rr: %d\n", as_sdp->target_rr);
+	drm_printf(p, "    duration_incr_ms: %d\n", as_sdp->duration_incr_ms);
+	drm_printf(p, "    duration_decr_ms: %d\n", as_sdp->duration_decr_ms);
+	drm_printf(p, "    operation_mode: %d\n", as_sdp->mode);
+}
+EXPORT_SYMBOL(drm_dp_as_sdp_log);
+
  /**
   * drm_dp_as_sdp_supported() - check if adaptive sync sdp is supported
   * @aux: DisplayPort AUX channel
diff --git a/drivers/gpu/drm/i915/display/intel_crtc_state_dump.c b/drivers/gpu/drm/i915/display/intel_crtc_state_dump.c
index 4bcf446c75f4..26d77c2934e8 100644
--- a/drivers/gpu/drm/i915/display/intel_crtc_state_dump.c
+++ b/drivers/gpu/drm/i915/display/intel_crtc_state_dump.c
@@ -60,6 +60,15 @@ intel_dump_dp_vsc_sdp(struct drm_i915_private *i915,
  	drm_dp_vsc_sdp_log(&p, vsc);
  }
+static void
+intel_dump_dp_as_sdp(struct drm_i915_private *i915,
+		     const struct drm_dp_as_sdp *as_sdp)
+{
+	struct drm_printer p = drm_dbg_printer(&i915->drm, DRM_UT_KMS, "AS_SDP");
+
+	drm_dp_as_sdp_log(&p, as_sdp);
+}
+
  static void
  intel_dump_buffer(struct drm_i915_private *i915,
  		  const char *prefix, const u8 *buf, size_t len)
@@ -299,6 +308,9 @@ void intel_crtc_state_dump(const struct intel_crtc_state *pipe_config,
  	if (pipe_config->infoframes.enable &
  	    intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA))
  		intel_dump_infoframe(i915, &pipe_config->infoframes.drm);
+	if (pipe_config->infoframes.enable &
+	    intel_hdmi_infoframe_enable(DP_SDP_ADAPTIVE_SYNC))
+		intel_dump_dp_as_sdp(i915, &pipe_config->infoframes.as_sdp);
  	if (pipe_config->infoframes.enable &
  	    intel_hdmi_infoframe_enable(DP_SDP_VSC))
  		intel_dump_dp_vsc_sdp(i915, &pipe_config->infoframes.vsc);
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 8ce986fadd9a..1256730ea276 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1335,6 +1335,7 @@ struct intel_crtc_state {
  		union hdmi_infoframe hdmi;
  		union hdmi_infoframe drm;
  		struct drm_dp_vsc_sdp vsc;
+		struct drm_dp_as_sdp as_sdp;
  	} infoframes;
u8 eld[MAX_ELD_BYTES];
diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h
index 281afff6ee4e..0601b95d53db 100644
--- a/include/drm/display/drm_dp.h
+++ b/include/drm/display/drm_dp.h
@@ -1578,10 +1578,12 @@ enum drm_dp_phy {
  #define DP_SDP_AUDIO_COPYMANAGEMENT	0x05 /* DP 1.2 */
  #define DP_SDP_ISRC			0x06 /* DP 1.2 */
  #define DP_SDP_VSC			0x07 /* DP 1.2 */
+#define DP_SDP_ADAPTIVE_SYNC		0x22 /* DP 1.4 */
  #define DP_SDP_CAMERA_GENERIC(i)	(0x08 + (i)) /* 0-7, DP 1.3 */
  #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
@@ -1737,4 +1739,11 @@ enum dp_content_type {
  	DP_CONTENT_TYPE_GAME = 0x04,
  };
+enum operation_mode {
+	DP_AS_SDP_AVT_DYNAMIC_VTOTAL = 0x00,
+	DP_AS_SDP_AVT_FIXED_VTOTAL = 0x01,
+	DP_AS_SDP_FAVT_TRR_NOT_REACHED = 0x02,
+	DP_AS_SDP_FAVT_TRR_REACHED = 0x03
+};

We can drop the initialization here.


+
  #endif /* _DRM_DP_H_ */
diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h
index 7c1aa3a703c8..7b7729488ad8 100644
--- a/include/drm/display/drm_dp_helper.h
+++ b/include/drm/display/drm_dp_helper.h
@@ -98,6 +98,37 @@ 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
+ * @revision: Revision Number
+ * @length: Number of valid data bytes
+ * @vtotal: Minimum Vertical Vtotal
+ * @target_rr: Target Refresh
+ * @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 vtotal;
+	int target_rr;
+	int duration_incr_ms;
+	int duration_decr_ms;
+	enum operation_mode mode;
+};
+
+void drm_dp_as_sdp_log(struct drm_printer *p,
+		       const struct drm_dp_as_sdp *as_sdp);
+
  void drm_dp_vsc_sdp_log(struct drm_printer *p, const struct drm_dp_vsc_sdp *vsc);
bool drm_dp_vsc_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
@@ -810,6 +841,8 @@ int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc);
  #define DRM_DP_BW_OVERHEAD_FEC		BIT(3)
  #define DRM_DP_BW_OVERHEAD_DSC		BIT(4)
+#define AS_SDP_OP_MODE GENMASK(1, 0)

I think we can keep this along the enum.

Apart from the above minor things, patch LGTM.

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>




+
  int drm_dp_bw_overhead(int lane_count, int hactive,
  		       int dsc_slice_count,
  		       int bpp_x16, unsigned long flags);



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