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-rw-r--r--drivers/gpu/drm/drm_edid.c102
1 files changed, 88 insertions, 14 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 9e62bbe..e8d17ee 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2321,6 +2321,31 @@ u8 *drm_find_cea_extension(struct edid *edid)
}
EXPORT_SYMBOL(drm_find_cea_extension);
+/*
+ * Calculate the alternate clock for the CEA mode
+ * (60Hz vs. 59.94Hz etc.)
+ */
+static unsigned int
+cea_mode_alternate_clock(const struct drm_display_mode *cea_mode)
+{
+ unsigned int clock = cea_mode->clock;
+
+ if (cea_mode->vrefresh % 6 != 0)
+ return clock;
+
+ /*
+ * edid_cea_modes contains the 59.94Hz
+ * variant for 240 and 480 line modes,
+ * and the 60Hz variant otherwise.
+ */
+ if (cea_mode->vdisplay == 240 || cea_mode->vdisplay == 480)
+ clock = clock * 1001 / 1000;
+ else
+ clock = DIV_ROUND_UP(clock * 1000, 1001);
+
+ return clock;
+}
+
/**
* drm_match_cea_mode - look for a CEA mode matching given mode
* @to_match: display mode
@@ -2339,21 +2364,9 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
const struct drm_display_mode *cea_mode = &edid_cea_modes[mode];
unsigned int clock1, clock2;
- clock1 = clock2 = cea_mode->clock;
-
/* Check both 60Hz and 59.94Hz */
- if (cea_mode->vrefresh % 6 == 0) {
- /*
- * edid_cea_modes contains the 59.94Hz
- * variant for 240 and 480 line modes,
- * and the 60Hz variant otherwise.
- */
- if (cea_mode->vdisplay == 240 ||
- cea_mode->vdisplay == 480)
- clock1 = clock1 * 1001 / 1000;
- else
- clock2 = DIV_ROUND_UP(clock2 * 1000, 1001);
- }
+ clock1 = cea_mode->clock;
+ clock2 = cea_mode_alternate_clock(cea_mode);
if ((KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock1) ||
KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock2)) &&
@@ -2364,6 +2377,66 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
}
EXPORT_SYMBOL(drm_match_cea_mode);
+static int
+add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_display_mode *mode, *tmp;
+ LIST_HEAD(list);
+ int modes = 0;
+
+ /* Don't add CEA modes if the CEA extension block is missing */
+ if (!drm_find_cea_extension(edid))
+ return 0;
+
+ /*
+ * Go through all probed modes and create a new mode
+ * with the alternate clock for certain CEA modes.
+ */
+ list_for_each_entry(mode, &connector->probed_modes, head) {
+ const struct drm_display_mode *cea_mode;
+ struct drm_display_mode *newmode;
+ u8 cea_mode_idx = drm_match_cea_mode(mode) - 1;
+ unsigned int clock1, clock2;
+
+ if (cea_mode_idx >= ARRAY_SIZE(edid_cea_modes))
+ continue;
+
+ cea_mode = &edid_cea_modes[cea_mode_idx];
+
+ clock1 = cea_mode->clock;
+ clock2 = cea_mode_alternate_clock(cea_mode);
+
+ if (clock1 == clock2)
+ continue;
+
+ if (mode->clock != clock1 && mode->clock != clock2)
+ continue;
+
+ newmode = drm_mode_duplicate(dev, cea_mode);
+ if (!newmode)
+ continue;
+
+ /*
+ * The current mode could be either variant. Make
+ * sure to pick the "other" clock for the new mode.
+ */
+ if (mode->clock != clock1)
+ newmode->clock = clock1;
+ else
+ newmode->clock = clock2;
+
+ list_add_tail(&newmode->head, &list);
+ }
+
+ list_for_each_entry_safe(mode, tmp, &list, head) {
+ list_del(&mode->head);
+ drm_mode_probed_add(connector, mode);
+ modes++;
+ }
+
+ return modes;
+}
static int
do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
@@ -2946,6 +3019,7 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
if (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)
num_modes += add_inferred_modes(connector, edid);
num_modes += add_cea_modes(connector, edid);
+ num_modes += add_alternate_cea_modes(connector, edid);
if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
edid_fixup_preferred(connector, quirks);