[PATCH v4 10/14] drm/amd/display: add a mid-layer file to handle EDID in DC

[Melissa Wen <mwen@igalia.com>]

From: Rodrigo Siqueira <siqueira@igalia.com>

Since DC is a shared code, this commit introduces a new file to work as
a mid-layer in DC for the edid manipulation.

v3:
- rebase on top of asdn

Signed-off-by: Rodrigo Siqueira <siqueira@igalia.com>
Co-developed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/Makefile    |  1 +
 .../gpu/drm/amd/display/amdgpu_dm/dc_edid.c   | 19 +++++++++++++++++++
 .../gpu/drm/amd/display/amdgpu_dm/dc_edid.h   | 11 +++++++++++
 .../drm/amd/display/dc/link/link_detection.c  | 17 +++--------------
 4 files changed, 34 insertions(+), 14 deletions(-)
 create mode 100644 drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.c
 create mode 100644 drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.h

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile b/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile
index 7329b8cc2576..09cb94d8e0e4 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile
@@ -39,6 +39,7 @@ AMDGPUDM = \
 	amdgpu_dm_psr.o \
 	amdgpu_dm_replay.o \
 	amdgpu_dm_quirks.o \
+	dc_edid.o \
 	amdgpu_dm_wb.o
 
 ifdef CONFIG_DRM_AMD_DC_FP
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.c b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.c
new file mode 100644
index 000000000000..fab873b091f5
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: MIT
+#include "amdgpu_dm/dc_edid.h"
+#include "dc.h"
+
+bool dc_edid_is_same_edid(struct dc_sink *prev_sink,
+			  struct dc_sink *current_sink)
+{
+	struct dc_edid *old_edid = &prev_sink->dc_edid;
+	struct dc_edid *new_edid = &current_sink->dc_edid;
+
+       if (old_edid->length != new_edid->length)
+               return false;
+
+       if (new_edid->length == 0)
+               return false;
+
+       return (memcmp(old_edid->raw_edid,
+                      new_edid->raw_edid, new_edid->length) == 0);
+}
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.h b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.h
new file mode 100644
index 000000000000..7e3b1177bc8a
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: MIT */
+
+#ifndef __DC_EDID_H__
+#define __DC_EDID_H__
+
+#include "dc.h"
+
+bool dc_edid_is_same_edid(struct dc_sink *prev_sink,
+			  struct dc_sink *current_sink);
+
+#endif /* __DC_EDID_H__ */
diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
index 863c24fe1117..344356e26f8b 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
@@ -48,6 +48,8 @@
 #include "dm_helpers.h"
 #include "clk_mgr.h"
 
+#include "dc_edid.h"
+
  // Offset DPCD 050Eh == 0x5A
 #define MST_HUB_ID_0x5A  0x5A
 
@@ -617,18 +619,6 @@ static bool detect_dp(struct dc_link *link,
 	return true;
 }
 
-static bool is_same_edid(struct dc_edid *old_edid, struct dc_edid *new_edid)
-{
-	if (old_edid->length != new_edid->length)
-		return false;
-
-	if (new_edid->length == 0)
-		return false;
-
-	return (memcmp(old_edid->raw_edid,
-		       new_edid->raw_edid, new_edid->length) == 0);
-}
-
 static bool wait_for_entering_dp_alt_mode(struct dc_link *link)
 {
 
@@ -1105,8 +1095,7 @@ static bool detect_link_and_local_sink(struct dc_link *link,
 		// Check if edid is the same
 		if ((prev_sink) &&
 		    (edid_status == EDID_THE_SAME || edid_status == EDID_OK))
-			same_edid = is_same_edid(&prev_sink->dc_edid,
-						 &sink->dc_edid);
+			same_edid = dc_edid_is_same_edid(prev_sink, sink);
 
 		if (sink->edid_caps.panel_patch.skip_scdc_overwrite)
 			link->ctx->dc->debug.hdmi20_disable = true;
-- 
2.47.2