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Commit 9fbbdde9 authored by Erik Gilling's avatar Erik Gilling Committed by Paul Mundt
Browse files

video: add fb_edid_add_monspecs for parsing extended edid information 



Modern monitors/tvs have more extended EDID information blocks which can
contain extra detailed modes.  This adds a fb_edid_add_monspecs function
which drivers can use to parse those additions blocks.

Signed-off-by: default avatarErik Gilling <konkers@android.com>
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent a7bcf21e

drivers/video/fbmon.c

+57 −0
Original line number Diff line number Diff line
@@ -973,6 +973,63 @@ void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 
	DPRINTK("========================================\n");

}



void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)

{

	unsigned char *block;

	struct fb_videomode *mode, *m;

	int num = 0, i, first = 1;



	if (edid == NULL)

		return;



	if (!edid_checksum(edid))

		return;



	if (edid[0] != 0x2)

		return;



	mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);

	if (mode == NULL)

		return;



	block = edid + edid[0x2];



	DPRINTK("  Extended Detailed Timings\n");



	for (i = 0; i < (128 - edid[0x2]) / DETAILED_TIMING_DESCRIPTION_SIZE;

	     i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {

		if (!(block[0] == 0x00 && block[1] == 0x00)) {

			get_detailed_timing(block, &mode[num]);

			if (first) {

			        mode[num].flag |= FB_MODE_IS_FIRST;

				first = 0;

			}

			num++;

		}

	}



	/* Yikes, EDID data is totally useless */

	if (!num) {

		kfree(mode);

		return;

	}



	m = kzalloc((specs->modedb_len + num) *

		       sizeof(struct fb_videomode), GFP_KERNEL);



	if (!m) {

		kfree(mode);

		return;

	}



	memmove(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));

	memmove(m + specs->modedb_len, mode, num * sizeof(struct fb_videomode));

	kfree(mode);

	kfree(specs->modedb);

	specs->modedb = m;

	specs->modedb_len = specs->modedb_len + num;

}



/*

 * VESA Generalized Timing Formula (GTF)

 */

include/linux/fb.h

+2 −0
Original line number Diff line number Diff line
@@ -1092,6 +1092,8 @@ extern int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var); 
extern const unsigned char *fb_firmware_edid(struct device *device);

extern void fb_edid_to_monspecs(unsigned char *edid,

				struct fb_monspecs *specs);

extern void fb_edid_add_monspecs(unsigned char *edid,

				 struct fb_monspecs *specs);

extern void fb_destroy_modedb(struct fb_videomode *modedb);

extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);

extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);