drm/edid: add #defines and helpers for ELD

In the interest of reducing magic numbers and having to cross check with
the specs all the time.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index b96031d..c2f1bfa 100644 (file)
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -207,6 +207,61 @@ struct detailed_timing {
 #define DRM_EDID_HDMI_DC_30               (1 << 4)
 #define DRM_EDID_HDMI_DC_Y444             (1 << 3)
 
+/* ELD Header Block */
+#define DRM_ELD_HEADER_BLOCK_SIZE      4
+
+#define DRM_ELD_VER                    0
+# define DRM_ELD_VER_SHIFT             3
+# define DRM_ELD_VER_MASK              (0x1f << 3)
+
+#define DRM_ELD_BASELINE_ELD_LEN       2       /* in dwords! */
+
+/* ELD Baseline Block for ELD_Ver == 2 */
+#define DRM_ELD_CEA_EDID_VER_MNL       4
+# define DRM_ELD_CEA_EDID_VER_SHIFT    5
+# define DRM_ELD_CEA_EDID_VER_MASK     (7 << 5)
+# define DRM_ELD_CEA_EDID_VER_NONE     (0 << 5)
+# define DRM_ELD_CEA_EDID_VER_CEA861   (1 << 5)
+# define DRM_ELD_CEA_EDID_VER_CEA861A  (2 << 5)
+# define DRM_ELD_CEA_EDID_VER_CEA861BCD        (3 << 5)
+# define DRM_ELD_MNL_SHIFT             0
+# define DRM_ELD_MNL_MASK              (0x1f << 0)
+
+#define DRM_ELD_SAD_COUNT_CONN_TYPE    5
+# define DRM_ELD_SAD_COUNT_SHIFT       4
+# define DRM_ELD_SAD_COUNT_MASK                (0xf << 4)
+# define DRM_ELD_CONN_TYPE_SHIFT       2
+# define DRM_ELD_CONN_TYPE_MASK                (3 << 2)
+# define DRM_ELD_CONN_TYPE_HDMI                (0 << 2)
+# define DRM_ELD_CONN_TYPE_DP          (1 << 2)
+# define DRM_ELD_SUPPORTS_AI           (1 << 1)
+# define DRM_ELD_SUPPORTS_HDCP         (1 << 0)
+
+#define DRM_ELD_AUD_SYNCH_DELAY                6       /* in units of 2 ms */
+# define DRM_ELD_AUD_SYNCH_DELAY_MAX   0xfa    /* 500 ms */
+
+#define DRM_ELD_SPEAKER                        7
+# define DRM_ELD_SPEAKER_RLRC          (1 << 6)
+# define DRM_ELD_SPEAKER_FLRC          (1 << 5)
+# define DRM_ELD_SPEAKER_RC            (1 << 4)
+# define DRM_ELD_SPEAKER_RLR           (1 << 3)
+# define DRM_ELD_SPEAKER_FC            (1 << 2)
+# define DRM_ELD_SPEAKER_LFE           (1 << 1)
+# define DRM_ELD_SPEAKER_FLR           (1 << 0)
+
+#define DRM_ELD_PORT_ID                        8       /* offsets 8..15 inclusive */
+# define DRM_ELD_PORT_ID_LEN           8
+
+#define DRM_ELD_MANUFACTURER_NAME0     16
+#define DRM_ELD_MANUFACTURER_NAME1     17
+
+#define DRM_ELD_PRODUCT_CODE0          18
+#define DRM_ELD_PRODUCT_CODE1          19
+
+#define DRM_ELD_MONITOR_NAME_STRING    20      /* offsets 20..(20+mnl-1) inclusive */
+
+#define DRM_ELD_CEA_SAD(mnl, sad)      (20 + (mnl) + 3 * (sad))
+
 struct edid {
        u8 header[8];
        /* Vendor & product info */
@@ -279,4 +334,51 @@ int
 drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
                                            const struct drm_display_mode *mode);
 
+/**
+ * drm_eld_mnl - Get ELD monitor name length in bytes.
+ * @eld: pointer to an eld memory structure with mnl set
+ */
+static inline int drm_eld_mnl(const uint8_t *eld)
+{
+       return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;
+}
+
+/**
+ * drm_eld_sad_count - Get ELD SAD count.
+ * @eld: pointer to an eld memory structure with sad_count set
+ */
+static inline int drm_eld_sad_count(const uint8_t *eld)
+{
+       return (eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_SAD_COUNT_MASK) >>
+               DRM_ELD_SAD_COUNT_SHIFT;
+}
+
+/**
+ * drm_eld_calc_baseline_block_size - Calculate baseline block size in bytes
+ * @eld: pointer to an eld memory structure with mnl and sad_count set
+ *
+ * This is a helper for determining the payload size of the baseline block, in
+ * bytes, for e.g. setting the Baseline_ELD_Len field in the ELD header block.
+ */
+static inline int drm_eld_calc_baseline_block_size(const uint8_t *eld)
+{
+       return DRM_ELD_MONITOR_NAME_STRING - DRM_ELD_HEADER_BLOCK_SIZE +
+               drm_eld_mnl(eld) + drm_eld_sad_count(eld) * 3;
+}
+
+/**
+ * drm_eld_size - Get ELD size in bytes
+ * @eld: pointer to a complete eld memory structure
+ *
+ * The returned value does not include the vendor block. It's vendor specific,
+ * and comprises of the remaining bytes in the ELD memory buffer after
+ * drm_eld_size() bytes of header and baseline block.
+ *
+ * The returned value is guaranteed to be a multiple of 4.
+ */
+static inline int drm_eld_size(const uint8_t *eld)
+{
+       return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4;
+}
+
 #endif /* __DRM_EDID_H__ */