[PATCH v2 1/4] drm/edid: add drm_edid_get_product_id()

[Jani Nikula]

Add a struct drm_edid based function to get the vendor and product ID
from an EDID. Add a separate struct for defining this part of the EDID,
with defined byte order for product code and serial number.

v2: Define manufacturer_name as __be16 instead of u8[2] (Ville)

Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Acked-by: Melissa Wen <m...@igalia.com>
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 15 +++++++++++++++
 include/drm/drm_edid.h     | 25 ++++++++++++++++++++-----
 2 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index ea77577a3786..626a0e24e66a 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2756,6 +2756,21 @@ const struct drm_edid *drm_edid_read(struct 
drm_connector *connector)
 }
 EXPORT_SYMBOL(drm_edid_read);
 
+/**
+ * drm_edid_get_product_id - Get the vendor and product identification
+ * @drm_edid: EDID
+ * @id: Where to place the product id
+ */
+void drm_edid_get_product_id(const struct drm_edid *drm_edid,
+                            struct drm_edid_product_id *id)
+{
+       if (drm_edid && drm_edid->edid && drm_edid->size >= EDID_LENGTH)
+               memcpy(id, &drm_edid->edid->product_id, sizeof(*id));
+       else
+               memset(id, 0, sizeof(*id));
+}
+EXPORT_SYMBOL(drm_edid_get_product_id);
+
 /**
  * drm_edid_get_panel_id - Get a panel's ID from EDID
  * @drm_edid: EDID that contains panel ID.
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 6f65bbf655a1..8bdd8d54815d 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -272,14 +272,27 @@ struct detailed_timing {
 #define DRM_EDID_DSC_MAX_SLICES                        0xf
 #define DRM_EDID_DSC_TOTAL_CHUNK_KBYTES                0x3f
 
+struct drm_edid_product_id {
+       __be16 manufacturer_name;
+       __le16 product_code;
+       __le32 serial_number;
+       u8 week_of_manufacture;
+       u8 year_of_manufacture;
+} __packed;
+
 struct edid {
        u8 header[8];
        /* Vendor & product info */
-       u8 mfg_id[2];
-       u8 prod_code[2];
-       u32 serial; /* FIXME: byte order */
-       u8 mfg_week;
-       u8 mfg_year;
+       union {
+               struct drm_edid_product_id product_id;
+               struct {
+                       u8 mfg_id[2];
+                       u8 prod_code[2];
+                       u32 serial; /* FIXME: byte order */
+                       u8 mfg_week;
+                       u8 mfg_year;
+               } __packed;
+       } __packed;
        /* EDID version */
        u8 version;
        u8 revision;
@@ -466,6 +479,8 @@ int drm_edid_connector_update(struct drm_connector 
*connector,
                              const struct drm_edid *edid);
 int drm_edid_connector_add_modes(struct drm_connector *connector);
 bool drm_edid_is_digital(const struct drm_edid *drm_edid);
+void drm_edid_get_product_id(const struct drm_edid *drm_edid,
+                            struct drm_edid_product_id *id);
 
 const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid,
                                  int ext_id, int *ext_index);
-- 
2.39.2