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 <a...@redhat.com>
---
drivers/gpu/drm/drm_edid.c | 47 ++++++++++++++++++++++++++++++++++++++++---
1 files changed, 43 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fb7c2fc..ead57ab 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -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,
@@ -673,6 +677,45 @@ 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.
@@ -964,10 +1007,6 @@ static struct drm_display_mode edid_est_modes[] = {
DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /*
1152x...@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
--
1.6.6.1
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