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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: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
hifive-unleashed-5.1
Adam Jackson 2010-03-29 21:43:26 +00:00 committed by Dave Airlie
parent a327f6b806
commit d1ff6409b1
1 changed files with 43 additions and 4 deletions
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47
drivers/gpu/drm/drm_edid.c
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@ -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