edid: Add a function to read detailed monitor timings
For digital displays (such as EDP LCDs) we would like to read the EDID
information and use that to set display timings. Provide a function to do
this.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/edid.h b/include/edid.h
index 18ec1d5..88b4b7d 100644
--- a/include/edid.h
+++ b/include/edid.h
@@ -15,6 +15,9 @@
#include <linux/types.h>
+/* Size of the EDID data */
+#define EDID_SIZE 128
+
#define GET_BIT(_x, _pos) \
(((_x) >> (_pos)) & 1)
#define GET_BITS(_x, _pos_msb, _pos_lsb) \
@@ -287,4 +290,20 @@
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_ */