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drm/i915: Update eDP fast link training link rate parsing

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We're not parsing the 5.4 Gbps value for the old eDP fast link
training link rate, nor are we parsing the new fast link training
link rate field. Remedy both.

Also we'll now use the actual link rate instead of the DPCD BW
register value.

Note that we're not even using this information for anything
currently, so should perhaps just nuke it all unless someone
is planning on implementing fast link training finally...

v2: Stop using the DPCD BW values (Jani)
    *20 instead of *2 to get the rate in correct units (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220602205649.11283-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä
2022-06-02 23:56:49 +03:00
parent f09d2b0bdd
commit f06d1d66d5
2 changed files with 21 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/gpu/drm/i915/display/intel_bios.c
View File

@@ -1366,18 +1366,26 @@ parse_edp(struct drm_i915_private *i915,
panel->vbt.edp.pps = *edp_pps;
switch (edp_link_params->rate) {
case EDP_RATE_1_62:
panel->vbt.edp.rate = DP_LINK_BW_1_62;
break;
case EDP_RATE_2_7:
panel->vbt.edp.rate = DP_LINK_BW_2_7;
break;
default:
drm_dbg_kms(&i915->drm,
"VBT has unknown eDP link rate value %u\n",
edp_link_params->rate);
break;
if (i915->vbt.version >= 224) {
panel->vbt.edp.rate =
edp->edp_fast_link_training_rate[panel_type] * 20;
} else {
switch (edp_link_params->rate) {
case EDP_RATE_1_62:
panel->vbt.edp.rate = 162000;
break;
case EDP_RATE_2_7:
panel->vbt.edp.rate = 270000;
break;
case EDP_RATE_5_4:
panel->vbt.edp.rate = 540000;
break;
default:
drm_dbg_kms(&i915->drm,
"VBT has unknown eDP link rate value %u\n",
edp_link_params->rate);
break;
}
}
switch (edp_link_params->lanes) {

1
drivers/gpu/drm/i915/display/intel_vbt_defs.h
View File

@@ -638,6 +638,7 @@ struct bdb_sdvo_panel_dtds {
#define EDP_30BPP 2
#define EDP_RATE_1_62 0
#define EDP_RATE_2_7 1
#define EDP_RATE_5_4 2
#define EDP_LANE_1 0
#define EDP_LANE_2 1
#define EDP_LANE_4 3