[PATCH 5/6] drm/edid: add helpers to get/set struct cea_sad from/to 3-byte sad

[Jani Nikula]

Add helpers to pack/unpack SADs. Both ways and non-static, as follow-up
work needs them.

Cc: Mitul Golani <mitulkumar.ajitkumar.gol...@intel.com>
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
 drivers/gpu/drm/drm_edid.c     | 33 ++++++++++++++++++++++++---------
 drivers/gpu/drm/drm_internal.h |  6 ++++++
 2 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fcdc2c314cde..1260e2688bd7 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -5499,6 +5499,27 @@ static void clear_eld(struct drm_connector *connector)
        connector->audio_latency[1] = 0;
 }
 
+/*
+ * Get 3-byte SAD buf from struct cea_sad.
+ */
+void drm_edid_cta_sad_get(const struct cea_sad *cta_sad, u8 *sad)
+{
+       sad[0] = cta_sad->format << 3 | cta_sad->channels;
+       sad[1] = cta_sad->freq;
+       sad[2] = cta_sad->byte2;
+}
+
+/*
+ * Set struct cea_sad from 3-byte SAD buf.
+ */
+void drm_edid_cta_sad_set(struct cea_sad *cta_sad, const u8 *sad)
+{
+       cta_sad->format = (sad[0] & 0x78) >> 3;
+       cta_sad->channels = sad[0] & 0x07;
+       cta_sad->freq = sad[1] & 0x7f;
+       cta_sad->byte2 = sad[2];
+}
+
 /*
  * drm_edid_to_eld - build ELD from EDID
  * @connector: connector corresponding to the HDMI/DP sink
@@ -5593,21 +5614,15 @@ static int _drm_edid_to_sad(const struct drm_edid 
*drm_edid,
        cea_db_iter_for_each(db, &iter) {
                if (cea_db_tag(db) == CTA_DB_AUDIO) {
                        struct cea_sad *sads;
-                       int j;
+                       int i;
 
                        count = cea_db_payload_len(db) / 3; /* SAD is 3B */
                        sads = kcalloc(count, sizeof(*sads), GFP_KERNEL);
                        *psads = sads;
                        if (!sads)
                                return -ENOMEM;
-                       for (j = 0; j < count; j++) {
-                               const u8 *sad = &db->data[j * 3];
-
-                               sads[j].format = (sad[0] & 0x78) >> 3;
-                               sads[j].channels = sad[0] & 0x7;
-                               sads[j].freq = sad[1] & 0x7F;
-                               sads[j].byte2 = sad[2];
-                       }
+                       for (i = 0; i < count; i++)
+                               drm_edid_cta_sad_set(&sads[i], &db->data[i * 
3]);
                        break;
                }
        }
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index ab9a472f4a47..5b7c661da459 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -22,6 +22,7 @@
  */
 
 #include <linux/kthread.h>
+#include <linux/types.h>
 
 #include <drm/drm_ioctl.h>
 #include <drm/drm_vblank.h>
@@ -31,6 +32,7 @@
 
 #define DRM_IF_VERSION(maj, min) (maj << 16 | min)
 
+struct cea_sad;
 struct dentry;
 struct dma_buf;
 struct iosys_map;
@@ -265,3 +267,7 @@ int drm_syncobj_query_ioctl(struct drm_device *dev, void 
*data,
 void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
                                const struct drm_framebuffer *fb);
 void drm_framebuffer_debugfs_init(struct drm_device *dev);
+
+/* drm_edid.c */
+void drm_edid_cta_sad_get(const struct cea_sad *cta_sad, u8 *sad);
+void drm_edid_cta_sad_set(struct cea_sad *cta_sad, const u8 *sad);
-- 
2.39.2