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authorRafał Miłecki <zajec5@gmail.com>2013-04-19 19:01:25 +0200
committerAlex Deucher <alexander.deucher@amd.com>2013-04-23 18:03:58 -0400
commitfe214163cc6e6b33253b7ac14bc3dd616e76b513 (patch)
tree32c17795c76da99c458c61f71127d4897f82deb3
parent205996c0776a229052c33688ee58a605a021740d (diff)
downloadop-kernel-dev-fe214163cc6e6b33253b7ac14bc3dd616e76b513.zip
op-kernel-dev-fe214163cc6e6b33253b7ac14bc3dd616e76b513.tar.gz
drm: add drm_edid_to_eld helper extracting SADs from EDID (v2)
Some devices (ATI/AMD cards) don't support passing ELD struct to the hardware but just require filling specific registers and then the hardware/firmware does the rest. In such cases we need to read the info from SAD blocks and put them in the correct registers. agd5f: note that the returned pointer needs to be kfreed as per Christian's suggestion. v2: fix warning Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
-rw-r--r--drivers/gpu/drm/drm_edid.c59
-rw-r--r--include/drm/drm_edid.h9
2 files changed, 68 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index e2acfdb..b6807e8 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2511,6 +2511,65 @@ void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
EXPORT_SYMBOL(drm_edid_to_eld);
/**
+ * drm_edid_to_sad - extracts SADs from EDID
+ * @edid: EDID to parse
+ * @sads: pointer that will be set to the extracted SADs
+ *
+ * Looks for CEA EDID block and extracts SADs (Short Audio Descriptors) from it.
+ * Note: returned pointer needs to be kfreed
+ *
+ * Return number of found SADs or negative number on error.
+ */
+int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
+{
+ int count = 0;
+ int i, start, end, dbl;
+ u8 *cea;
+
+ cea = drm_find_cea_extension(edid);
+ if (!cea) {
+ DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
+ return -ENOENT;
+ }
+
+ if (cea_revision(cea) < 3) {
+ DRM_DEBUG_KMS("SAD: wrong CEA revision\n");
+ return -ENOTSUPP;
+ }
+
+ if (cea_db_offsets(cea, &start, &end)) {
+ DRM_DEBUG_KMS("SAD: invalid data block offsets\n");
+ return -EPROTO;
+ }
+
+ for_each_cea_db(cea, i, start, end) {
+ u8 *db = &cea[i];
+
+ if (cea_db_tag(db) == AUDIO_BLOCK) {
+ int j;
+ dbl = cea_db_payload_len(db);
+
+ count = dbl / 3; /* SAD is 3B */
+ *sads = kcalloc(count, sizeof(**sads), GFP_KERNEL);
+ if (!*sads)
+ return -ENOMEM;
+ for (j = 0; j < count; j++) {
+ u8 *sad = &db[1 + 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];
+ }
+ break;
+ }
+ }
+
+ return count;
+}
+EXPORT_SYMBOL(drm_edid_to_sad);
+
+/**
* drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
* @connector: connector associated with the HDMI/DP sink
* @mode: the display mode
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 5da1b4a..fc481fc 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -244,12 +244,21 @@ struct edid {
#define EDID_PRODUCT_ID(e) ((e)->prod_code[0] | ((e)->prod_code[1] << 8))
+/* Short Audio Descriptor */
+struct cea_sad {
+ u8 format;
+ u8 channels; /* max number of channels - 1 */
+ u8 freq;
+ u8 byte2; /* meaning depends on format */
+};
+
struct drm_encoder;
struct drm_connector;
struct drm_display_mode;
struct hdmi_avi_infoframe;
void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);
+int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads);
int drm_av_sync_delay(struct drm_connector *connector,
struct drm_display_mode *mode);
struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
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