+/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2012 The Chromium OS Authors.
*
* (C) Copyright 2010
* Petr Stetiar <ynezz@true.cz>
*
- * SPDX-License-Identifier: GPL-2.0+
- *
* Contains stolen code from ddcprobe project which is:
* Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
*/
#include <linux/types.h>
+/* Size of the EDID data */
+#define EDID_SIZE 128
+#define EDID_EXT_SIZE 256
+
+/* OUI of HDMI vendor specific data block */
+#define HDMI_IEEE_OUI 0x000c03
+
#define GET_BIT(_x, _pos) \
(((_x) >> (_pos)) & 1)
#define GET_BITS(_x, _pos_msb, _pos_lsb) \
(_x).vertical_blanking)
unsigned char hsync_offset;
unsigned char hsync_pulse_width;
- unsigned char sync_offset_pulse_width;
+ unsigned char vsync_offset_pulse_width;
unsigned char hsync_vsync_offset_pulse_width_hi;
#define EDID_DETAILED_TIMING_HSYNC_OFFSET(_x) \
((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 7, 6) << 8) + \
GET_BITS((_x).flags, 4, 3)
#define EDID_DETAILED_TIMING_FLAG_POLARITY(_x) \
GET_BITS((_x).flags, 2, 1)
+#define EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(_x) \
+ GET_BIT((_x).flags, 2)
+#define EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(_x) \
+ GET_BIT((_x).flags, 1)
#define EDID_DETAILED_TIMING_FLAG_INTERLEAVED(_x) \
GET_BIT((_x).flags, 0)
} __attribute__ ((__packed__));
unsigned char checksum;
} __attribute__ ((__packed__));
+enum edid_cea861_db_types {
+ EDID_CEA861_DB_AUDIO = 0x01,
+ EDID_CEA861_DB_VIDEO = 0x02,
+ EDID_CEA861_DB_VENDOR = 0x03,
+ EDID_CEA861_DB_SPEAKER = 0x04,
+};
+
+struct edid_cea861_info {
+ unsigned char extension_tag;
+#define EDID_CEA861_EXTENSION_TAG 0x02
+ unsigned char revision;
+ unsigned char dtd_offset;
+ unsigned char dtd_count;
+#define EDID_CEA861_SUPPORTS_UNDERSCAN(_x) \
+ GET_BIT(((_x).dtd_count), 7)
+#define EDID_CEA861_SUPPORTS_BASIC_AUDIO(_x) \
+ GET_BIT(((_x).dtd_count), 6)
+#define EDID_CEA861_SUPPORTS_YUV444(_x) \
+ GET_BIT(((_x).dtd_count), 5)
+#define EDID_CEA861_SUPPORTS_YUV422(_x) \
+ GET_BIT(((_x).dtd_count), 4)
+#define EDID_CEA861_DTD_COUNT(_x) \
+ GET_BITS(((_x).dtd_count), 3, 0)
+ unsigned char data[124];
+#define EDID_CEA861_DB_TYPE(_x, offset) \
+ GET_BITS((_x).data[offset], 7, 5)
+#define EDID_CEA861_DB_LEN(_x, offset) \
+ GET_BITS((_x).data[offset], 4, 0)
+} __attribute__ ((__packed__));
+
/**
* Print the EDID info.
*
*/
int edid_check_info(struct edid1_info *info);
+/**
+ * Check checksum of a 128 bytes EDID data block
+ *
+ * @param edid_block EDID block data
+ *
+ * @return 0 on success, or a negative errno on error
+ */
+int edid_check_checksum(u8 *edid_block);
+
/**
* Get the horizontal and vertical rate ranges of the monitor.
*
unsigned int *hmax, unsigned int *vmin,
unsigned int *vmax);
+struct display_timing;
+
+/**
+ * edid_get_timing() - Get basic digital display parameters
+ *
+ * @param buf Buffer containing EDID data
+ * @param buf_size Size of buffer in bytes
+ * @param timing Place to put preferring timing information
+ * @param panel_bits_per_colourp Place to put the number of bits per
+ * colour supported by the panel. This will be set to
+ * -1 if not available
+ * @return 0 if timings are OK, -ve on error
+ */
+int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing,
+ int *panel_bits_per_colourp);
+
#endif /* __EDID_H_ */