From af26608891d7b8248f52bde1c51db66507cfd0aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Sat, 27 Aug 2022 00:34:51 +0300
Subject: drm/edid: Handle EDID 1.4 range descriptor h/vfreq offsets
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Git-commit: c7943bb324e503baeeba3df2bc5ca8a377111bfa
Patch-mainline: v6.0-rc5
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
EDID 1.4 introduced some extra flags in the range
descriptor to support min/max h/vfreq >= 255. Consult them
to correctly parse the vfreq limits.
Note that some combinations of the flags are documented
as "reserved" (as are some other values in the descriptor)
but explicitly checking for those doesn't seem particularly
worthwile since we end up with bogus results whether we
decode them or not.
v2: Increase the storage to u16 to make it work (Jani)
Note the "reserved" values situation (Jani)
v3: Document the EDID version number in the defines
Drop some bogus (u8) casts
Cc: stable@vger.kernel.org
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6519
References: https://gitlab.freedesktop.org/drm/intel/-/issues/6484
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220826213501.31490-2-ville.syrjala@linux.intel.com
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/drm_debugfs.c | 4 ++--
drivers/gpu/drm/drm_edid.c | 24 ++++++++++++++++++------
include/drm/drm_connector.h | 4 ++--
include/drm/drm_edid.h | 5 +++++
4 files changed, 27 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 493922069c90..01ee3febb813 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -377,8 +377,8 @@ static int vrr_range_show(struct seq_file *m, void *data)
if (connector->status != connector_status_connected)
return -ENODEV;
- seq_printf(m, "Min: %u\n", (u8)connector->display_info.monitor_range.min_vfreq);
- seq_printf(m, "Max: %u\n", (u8)connector->display_info.monitor_range.max_vfreq);
+ seq_printf(m, "Min: %u\n", connector->display_info.monitor_range.min_vfreq);
+ seq_printf(m, "Max: %u\n", connector->display_info.monitor_range.max_vfreq);
return 0;
}
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index bbc25e3b7220..eaa819381281 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -5971,12 +5971,14 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
}
static
-void get_monitor_range(const struct detailed_timing *timing,
- void *info_monitor_range)
+void get_monitor_range(const struct detailed_timing *timing, void *c)
{
- struct drm_monitor_range_info *monitor_range = info_monitor_range;
+ struct detailed_mode_closure *closure = c;
+ struct drm_display_info *info = &closure->connector->display_info;
+ struct drm_monitor_range_info *monitor_range = &info->monitor_range;
const struct detailed_non_pixel *data = &timing->data.other_data;
const struct detailed_data_monitor_range *range = &data->data.range;
+ const struct edid *edid = closure->drm_edid->edid;
if (!is_display_descriptor(timing, EDID_DETAIL_MONITOR_RANGE))
return;
@@ -5992,18 +5994,28 @@ void get_monitor_range(const struct detailed_timing *timing,
monitor_range->min_vfreq = range->min_vfreq;
monitor_range->max_vfreq = range->max_vfreq;
+
+ if (edid->revision >= 4) {
+ if (data->pad2 & DRM_EDID_RANGE_OFFSET_MIN_VFREQ)
+ monitor_range->min_vfreq += 255;
+ if (data->pad2 & DRM_EDID_RANGE_OFFSET_MAX_VFREQ)
+ monitor_range->max_vfreq += 255;
+ }
}
static void drm_get_monitor_range(struct drm_connector *connector,
const struct drm_edid *drm_edid)
{
- struct drm_display_info *info = &connector->display_info;
+ const struct drm_display_info *info = &connector->display_info;
+ struct detailed_mode_closure closure = {
+ .connector = connector,
+ .drm_edid = drm_edid,
+ };
if (!version_greater(drm_edid, 1, 1))
return;
- drm_for_each_detailed_block(drm_edid, get_monitor_range,
- &info->monitor_range);
+ drm_for_each_detailed_block(drm_edid, get_monitor_range, &closure);
DRM_DEBUG_KMS("Supported Monitor Refresh rate range is %d Hz - %d Hz\n",
info->monitor_range.min_vfreq,
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index a1705d6b3fba..7df7876b2ad5 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -319,8 +319,8 @@ enum drm_panel_orientation {
* EDID's detailed monitor range
*/
struct drm_monitor_range_info {
- u8 min_vfreq;
- u8 max_vfreq;
+ u16 min_vfreq;
+ u16 max_vfreq;
};
/**
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 2181977ae683..1ed61e2b30a4 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -92,6 +92,11 @@ struct detailed_data_string {
u8 str[13];
} __attribute__((packed));
+#define DRM_EDID_RANGE_OFFSET_MIN_VFREQ (1 << 0) /* 1.4 */
+#define DRM_EDID_RANGE_OFFSET_MAX_VFREQ (1 << 1) /* 1.4 */
+#define DRM_EDID_RANGE_OFFSET_MIN_HFREQ (1 << 2) /* 1.4 */
+#define DRM_EDID_RANGE_OFFSET_MAX_HFREQ (1 << 3) /* 1.4 */
+
#define DRM_EDID_DEFAULT_GTF_SUPPORT_FLAG 0x00
#define DRM_EDID_RANGE_LIMITS_ONLY_FLAG 0x01
#define DRM_EDID_SECONDARY_GTF_SUPPORT_FLAG 0x02
--
2.38.1