Add a quirk which adds a new downclocked mode to the EDID of Samsung
LTN121AT10-301 panels. This allows the intel driver to apply downclocking
and save power.
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 7425e5c..e2e3d9b 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -65,6 +65,8 @@
#define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
/* use +hsync +vsync for detailed mode */
#define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
+/* the panel supports, but does not include a lower clocked mode for lvds */
+#define EDID_QUIRK_ADD_DOWNCLOCK_MODE (1 << 7)
struct detailed_mode_closure {
struct drm_connector *connector;
@@ -119,6 +121,18 @@ static struct edid_quirk {
/* Samsung SyncMaster 22[5-6]BW */
{ "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
{ "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
+
+ /* Samsung TFT-LCD LTN121AT10-301 */
+ { "SEC", 0x3142, EDID_QUIRK_ADD_DOWNCLOCK_MODE },
+};
+
+static struct downclock_rate {
+ char *vendor;
+ int product_id;
+ int clock;
+} downclock_rate_list[] = {
+ /* Samsung TFT-LCD LTN121AT10-301 */
+ { "SEC", 0x3142, 56428},
};
/*** DDC fetch and block validation ***/
@@ -481,6 +495,36 @@ static void edid_fixup_preferred(struct drm_connector *connector,
preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
}
+static int edid_add_downclock(struct drm_connector *connector,
+ struct edid *edid)
+{
+ struct drm_display_mode *t, *cur_mode, *downclock_mode;
+ struct downclock_rate *rate;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(downclock_rate_list); i++) {
+ rate = &downclock_rate_list[i];
+
+ if (edid_vendor(edid, rate->vendor) &&
+ (EDID_PRODUCT_ID(edid) == rate->product_id))
+ break;
+ }
+ if (i == ARRAY_SIZE(downclock_rate_list))
+ return 0;
+
+ list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
+ if (!(cur_mode->type & DRM_MODE_TYPE_PREFERRED))
+ continue;
+
+ downclock_mode = drm_mode_duplicate(connector->dev, cur_mode);
+ downclock_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
+ downclock_mode->clock = rate->clock;
+ drm_mode_probed_add(connector, downclock_mode);
+ return 1;
+ }
+ return 0;
+}
+
struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
int hsize, int vsize, int fresh)
{
@@ -1554,6 +1598,9 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
edid_fixup_preferred(connector, quirks);
+ if (quirks & EDID_QUIRK_ADD_DOWNCLOCK_MODE)
+ num_modes += edid_add_downclock(connector, edid);
+
drm_add_display_info(edid, &connector->display_info);
return num_modes;
--
1.7.7.3
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