[PATCH 2/4] drm/edid: add drm_edid_print_product_id()

[Jani Nikula <jani.nikula@xxxxxxxxx>]

Add a function to print a decoded EDID vendor and product id to a drm
printer, optinally with the raw data.

Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
 drivers/gpu/drm/drm_edid.c | 35 +++++++++++++++++++++++++++++++++++
 include/drm/drm_edid.h     |  3 +++
 2 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 626a0e24e66a..198986f0eb8b 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -29,6 +29,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/byteorder/generic.h>
 #include <linux/cec.h>
 #include <linux/hdmi.h>
 #include <linux/i2c.h>
@@ -2771,6 +2772,40 @@ void drm_edid_get_product_id(const struct drm_edid *drm_edid,
 }
 EXPORT_SYMBOL(drm_edid_get_product_id);
 
+/**
+ * drm_edid_print_product_id - Print decoded product id to printer
+ * @p: drm printer
+ * @id: EDID product id
+ * @raw: If true, also print the raw hex
+ */
+void drm_edid_print_product_id(struct drm_printer *p,
+			       const struct drm_edid_product_id *id, bool raw)
+{
+	u16 mfg_id = id->manufacturer_name[0] << 8 | id->manufacturer_name[1];
+	char *date;
+	char vend[4];
+
+	drm_edid_decode_mfg_id(mfg_id, vend);
+
+	if (id->week_of_manufacture == 0xff)
+		date = kasprintf(GFP_KERNEL, "model year: %d",
+				 id->year_of_manufacture + 1990);
+	else
+		date = kasprintf(GFP_KERNEL, "week: %d, year of manufacture: %d",
+				 id->week_of_manufacture,
+				 id->year_of_manufacture + 1990);
+
+	drm_printf(p, "manufacturer name: %s, product code: %u, serial number: %u, %s\n",
+		   vend, le16_to_cpu(id->product_code),
+		   le32_to_cpu(id->serial_number), date ?: "");
+
+	if (raw)
+		drm_printf(p, "raw product id: %*ph\n", (int)sizeof(*id), id);
+
+	kfree(date);
+}
+EXPORT_SYMBOL(drm_edid_print_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 7911a2f8a672..c763ba1a0bbd 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -30,6 +30,7 @@ struct drm_connector;
 struct drm_device;
 struct drm_display_mode;
 struct drm_edid;
+struct drm_printer;
 struct hdmi_avi_infoframe;
 struct hdmi_vendor_infoframe;
 struct i2c_adapter;
@@ -481,6 +482,8 @@ 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);
+void drm_edid_print_product_id(struct drm_printer *p,
+			       const struct drm_edid_product_id *id, bool raw);
 
 const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid,
 				  int ext_id, int *ext_index);
-- 
2.39.2