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UPSTREAM: drm/edid: Parse MAX_FRL field from HFVSDB block

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This patch parses MAX_FRL field to get the MAX rate in Gbps that
the HDMI 2.1 panel can support in FRL mode. Source need this
field to determine the optimal rate between the source and sink
during FRL training.

v2: Fixed minor bugs, and removed extra wrapper function (Uma Shankar)

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
[Jani: Fixed checkpatch FROM_SIGN_OFF_MISMATCH, PARENTHESIS_ALIGNMENT.]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201218103723.30844-3-ankit.k.nautiyal@intel.com
(cherry picked from commit 4499d488f6)
Change-Id: I34cec87592960398eb04e9c2437b9352c14cdf3e
This commit is contained in:
Swati Sharma
2020-12-18 16:07:10 +05:30
committed by Tao Huang
parent e95a840b8e
commit 67020697e3
2 changed files with 50 additions and 0 deletions
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44
drivers/gpu/drm/drm_edid.c
View File

@@ -4277,6 +4277,41 @@ static void drm_parse_ycbcr420_deep_color_info(struct drm_connector *connector,
hdmi->y420_dc_modes = dc_mask;
}
static
void drm_get_max_frl_rate(int max_frl_rate, u8 *max_lanes, u8 *max_rate_per_lane)
{
switch (max_frl_rate) {
case 1:
*max_lanes = 3;
*max_rate_per_lane = 3;
break;
case 2:
*max_lanes = 3;
*max_rate_per_lane = 6;
break;
case 3:
*max_lanes = 4;
*max_rate_per_lane = 6;
break;
case 4:
*max_lanes = 4;
*max_rate_per_lane = 8;
break;
case 5:
*max_lanes = 4;
*max_rate_per_lane = 10;
break;
case 6:
*max_lanes = 4;
*max_rate_per_lane = 12;
break;
case 0:
default:
*max_lanes = 0;
*max_rate_per_lane = 0;
}
}
static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
const u8 *hf_vsdb)
{
@@ -4320,6 +4355,15 @@ static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
}
}
if (hf_vsdb[7]) {
u8 max_frl_rate;
DRM_DEBUG_KMS("hdmi_21 sink detected. parsing edid\n");
max_frl_rate = (hf_vsdb[7] & DRM_EDID_MAX_FRL_RATE_MASK) >> 4;
drm_get_max_frl_rate(max_frl_rate, &hdmi->max_lanes,
&hdmi->max_frl_rate_per_lane);
}
drm_parse_ycbcr420_deep_color_info(connector, hf_vsdb);
parse_hdmi_hf_vsdb(connector, hf_vsdb);
}

6
include/drm/drm_connector.h
View File

@@ -209,6 +209,12 @@ struct drm_hdmi_info {
/* @colorimetry: bitmap of supported colorimetry modes */
u16 colorimetry;
/** @max_frl_rate_per_lane: support fixed rate link */
u8 max_frl_rate_per_lane;
/** @max_lanes: supported by sink */
u8 max_lanes;
};
/**