linux-kernel - [PATCH 5.15 252/279] drm/i915/dp: Ensure max link params are always valid

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Message-Id: <20211124115727.431013071@linuxfoundation.org>
Date:   Wed, 24 Nov 2021 12:58:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, Imre Deak <imre.deak@...el.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: [PATCH 5.15 252/279] drm/i915/dp: Ensure max link params are always valid

From: Imre Deak <imre.deak@...el.com>

commit cc99bc62ff6902688ee7bd3a7b25eefc620fbb6a upstream.

Atm until the DPCD for a connector is read the max link rate and lane
count params are invalid. If the connector is modeset, in
intel_dp_compute_config(), intel_dp_common_len_rate_limit(max_link_rate)
will return 0, leading to a intel_dp->common_rates[-1] access.

Fix the above by making sure the max link params are always valid.

The above access leads to an undefined behaviour by definition, though
not causing a user visible problem to my best knowledge, see the previous
patch why. Nevertheless it is an undefined behaviour and it triggers a
BUG() in CONFIG_UBSAN builds, hence CC:stable.

Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Imre Deak <imre.deak@...el.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Acked-by: Jani Nikula <jani.nikula@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018094154.1407705-4-imre.deak@intel.com
(cherry picked from commit 9ad87de4735620ffc555592e8c5f580478fa3ed0)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/i915/display/intel_dp.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1773,6 +1773,12 @@ void intel_dp_set_link_params(struct int
 	intel_dp->lane_count = lane_count;
 }
 
+static void intel_dp_reset_max_link_params(struct intel_dp *intel_dp)
+{
+	intel_dp->max_link_lane_count = intel_dp_max_common_lane_count(intel_dp);
+	intel_dp->max_link_rate = intel_dp_max_common_rate(intel_dp);
+}
+
 /* Enable backlight PWM and backlight PP control. */
 void intel_edp_backlight_on(const struct intel_crtc_state *crtc_state,
 			    const struct drm_connector_state *conn_state)
@@ -1932,8 +1938,7 @@ void intel_dp_sync_state(struct intel_en
 	if (intel_dp->dpcd[DP_DPCD_REV] == 0)
 		intel_dp_get_dpcd(intel_dp);
 
-	intel_dp->max_link_lane_count = intel_dp_max_common_lane_count(intel_dp);
-	intel_dp->max_link_rate = intel_dp_max_common_rate(intel_dp);
+	intel_dp_reset_max_link_params(intel_dp);
 }
 
 bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
@@ -2506,6 +2511,7 @@ intel_edp_init_dpcd(struct intel_dp *int
 		intel_dp_set_sink_rates(intel_dp);
 
 	intel_dp_set_common_rates(intel_dp);
+	intel_dp_reset_max_link_params(intel_dp);
 
 	/* Read the eDP DSC DPCD registers */
 	if (DISPLAY_VER(dev_priv) >= 10)
@@ -4249,12 +4255,7 @@ intel_dp_detect(struct drm_connector *co
 	 * supports link training fallback params.
 	 */
 	if (intel_dp->reset_link_params || intel_dp->is_mst) {
-		/* Initial max link lane count */
-		intel_dp->max_link_lane_count = intel_dp_max_common_lane_count(intel_dp);
-
-		/* Initial max link rate */
-		intel_dp->max_link_rate = intel_dp_max_common_rate(intel_dp);
-
+		intel_dp_reset_max_link_params(intel_dp);
 		intel_dp->reset_link_params = false;
 	}
 
@@ -5307,6 +5308,7 @@ intel_dp_init_connector(struct intel_dig
 	intel_dp_set_source_rates(intel_dp);
 	intel_dp_set_default_sink_rates(intel_dp);
 	intel_dp_set_common_rates(intel_dp);
+	intel_dp_reset_max_link_params(intel_dp);
 
 	intel_dp->reset_link_params = true;
 	intel_dp->pps.pps_pipe = INVALID_PIPE;