Commit d1ff6409 authored by Adam Jackson's avatar Adam Jackson Committed by Dave Airlie
Browse files

drm/edid: Add test for monitor reduced blanking support. 



The generic block walk callback looks like overkill, but we'll need it
for other detailed block walks in the future.

Signed-off-by: default avatarAdam Jackson <ajax@redhat.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent a327f6b8

drivers/gpu/drm/drm_edid.c

+43 −4
Original line number Diff line number Diff line
@@ -33,6 +33,10 @@ 
#include "drmP.h"

#include "drm_edid.h"



#define EDID_EST_TIMINGS 16

#define EDID_STD_TIMINGS 8

#define EDID_DETAILED_TIMINGS 4



/*

 * EDID blocks out in the wild have a variety of bugs, try to collect

 * them here (note that userspace may work around broken monitors first,
@@ -670,6 +674,45 @@ static struct drm_display_mode *drm_find_dmt(struct drm_device *dev, 
	return mode;

}



typedef void detailed_cb(struct detailed_timing *timing, void *closure);



static void

drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)

{

	int i;

	struct edid *edid = (struct edid *)raw_edid;



	if (edid == NULL)

		return;



	for (i = 0; i < EDID_DETAILED_TIMINGS; i++)

		cb(&(edid->detailed_timings[i]), closure);



	/* XXX extension block walk */

}



static void

is_rb(struct detailed_timing *t, void *data)

{

	u8 *r = (u8 *)t;

	if (r[3] == EDID_DETAIL_MONITOR_RANGE)

		if (r[15] & 0x10)

			*(bool *)data = true;

}



/* EDID 1.4 defines this explicitly.  For EDID 1.3, we guess, badly. */

static bool

drm_monitor_supports_rb(struct edid *edid)

{

	if (edid->revision >= 4) {

		bool ret;

		drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);

		return ret;

	}



	return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);

}



/*

 * 0 is reserved.  The spec says 0x01 fill for unused timings.  Some old

 * monitors fill with ascii space (0x20) instead.
@@ -952,10 +995,6 @@ static struct drm_display_mode edid_est_modes[] = { 
		   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */

};



#define EDID_EST_TIMINGS 16

#define EDID_STD_TIMINGS 8

#define EDID_DETAILED_TIMINGS 4



/**

 * add_established_modes - get est. modes from EDID and add them

 * @edid: EDID block to scan