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drm/i915: Check for unsupported DP link rates during initial commit 

Some BIOSes set an unsupported/imprecise DP link rate (for instance on
TGL A stepping). Make sure that we do an encoder recompute and a modeset
in this case.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201003001846.1271151-4-imre.deak@intel.com
This commit is contained in:
Imre Deak 2020-10-03 03:18:44 +03:00
parent b671d6ef8b
commit 7d6287a848
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/i915/display/intel_dp.c
View File

@ -3707,6 +3707,18 @@ bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
/*
* If BIOS has set an unsupported or non-standard link rate for some
* reason force an encoder recompute and full modeset.
*/
if (intel_dp_rate_index(intel_dp->source_rates, intel_dp->num_source_rates,
crtc_state->port_clock) < 0) {
drm_dbg_kms(&i915->drm, "Forcing full modeset due to unsupported link rate\n");
crtc_state->uapi.connectors_changed = true;
return false;
}
/*
* FIXME hack to force full modeset when DSC is being used.