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drm/i915: Disable LTTPR support when the LTTPR rev < 1.4 

By the specification the 0xF0000 - 0xF02FF range is only valid if the
LTTPR revision at 0xF0000 is at least 1.4. Disable the LTTPR support
otherwise.

Fixes: 7b2a4ab8b0 ("drm/i915: Switch to LTTPR transparent mode link training")
Cc: <stable@vger.kernel.org> # v5.11
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210317184901.4029798-4-imre.deak@intel.com
(cherry picked from commit 1663ad4936)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Imre Deak 2021-03-17 20:49:01 +02:00 committed by Rodrigo Vivi
parent 7dffbdedb9
commit ab03631087
1 changed files with 10 additions and 4 deletions
drivers/gpu/drm/i915/display
intel_dp_link_training.c

14
drivers/gpu/drm/i915/display/intel_dp_link_training.c
View File

@ -99,17 +99,23 @@ static bool intel_dp_read_lttpr_common_caps(struct intel_dp *intel_dp)
return false;
if (drm_dp_read_lttpr_common_caps(&intel_dp->aux,
intel_dp->lttpr_common_caps) < 0) {
intel_dp_reset_lttpr_common_caps(intel_dp);
return false;
}
intel_dp->lttpr_common_caps) < 0)
goto reset_caps;
drm_dbg_kms(&dp_to_i915(intel_dp)->drm,
"LTTPR common capabilities: %*ph\n",
(int)sizeof(intel_dp->lttpr_common_caps),
intel_dp->lttpr_common_caps);
/* The minimum value of LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV is 1.4 */
if (intel_dp->lttpr_common_caps[0] < 0x14)
goto reset_caps;
return true;
reset_caps:
intel_dp_reset_lttpr_common_caps(intel_dp);
return false;
}
static bool