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drm/i915/dp: Factor out intel_dp_read_dprx_caps()

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Factor out a function to read the sink's DPRX capabilities used by a
follow-up patch enabling the DP tunnel BW allocation mode.

Reviewed-by: Uma Shankar <uma.shankar@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/20240220211841.448846-10-imre.deak@intel.com
This commit is contained in:
Imre Deak 2024-02-20 23:18:29 +02:00
parent 85e5be6821
commit 363c317873
2 changed files with 26 additions and 5 deletions
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30
drivers/gpu/drm/i915/display/intel_dp_link_training.c
View File

@ -162,6 +162,28 @@ static int intel_dp_init_lttpr(struct intel_dp *intel_dp, const u8 dpcd[DP_RECEI
return lttpr_count;
}
int intel_dp_read_dprx_caps(struct intel_dp *intel_dp, u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
struct drm_i915_private *i915 = dp_to_i915(intel_dp);
if (intel_dp_is_edp(intel_dp))
return 0;
/*
* Detecting LTTPRs must be avoided on platforms with an AUX timeout
* period < 3.2ms. (see DP Standard v2.0, 2.11.2, 3.6.6.1).
*/
if (DISPLAY_VER(i915) >= 10 && !IS_GEMINILAKE(i915))
if (drm_dp_dpcd_probe(&intel_dp->aux,
DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV))
return -EIO;
if (drm_dp_read_dpcd_caps(&intel_dp->aux, dpcd))
return -EIO;
return 0;
}
/**
* intel_dp_init_lttpr_and_dprx_caps - detect LTTPR and DPRX caps, init the LTTPR link training mode
* @intel_dp: Intel DP struct
@ -192,12 +214,10 @@ int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp)
if (!intel_dp_is_edp(intel_dp) &&
(DISPLAY_VER(i915) >= 10 && !IS_GEMINILAKE(i915))) {
u8 dpcd[DP_RECEIVER_CAP_SIZE];
int err = intel_dp_read_dprx_caps(intel_dp, dpcd);
if (drm_dp_dpcd_probe(&intel_dp->aux, DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV))
return -EIO;
if (drm_dp_read_dpcd_caps(&intel_dp->aux, dpcd))
return -EIO;
if (err != 0)
return err;
lttpr_count = intel_dp_init_lttpr(intel_dp, dpcd);
}

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

@ -11,6 +11,7 @@
struct intel_crtc_state;
struct intel_dp;
int intel_dp_read_dprx_caps(struct intel_dp *intel_dp, u8 dpcd[DP_RECEIVER_CAP_SIZE]);
int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp);
void intel_dp_get_adjust_train(struct intel_dp *intel_dp,