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disp: msm: dp: address race condition in LM allocation

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Addresses a race condition which could cause the RM to overcommiting LMs to
DP when multiple DP displays are used.

sde_rm_get_resource_info now uses the RM's mutex and assumes a null
encoder is not a built in display so that it can return an accurate
count of unreserved resources.

DP layer now maintains internal accounting of LMs in use to avoid
validating modes that have insufficient remaining resources.

Change-Id: I908c1597c1d651b6f9c9b74a34137f30087d8801
Signed-off-by: Alex Danila <quic_eadanila@quicinc.com>
This commit is contained in:
Alex Danila
2021-12-14 13:37:22 -05:00
parent 7b00783abe
commit 5ed42eb243
7 changed files with 82 additions and 17 deletions
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4
msm/dp/dp_drm.c
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@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
* Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.
*/
@@ -256,6 +257,8 @@ static void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
dp->convert_to_dp_mode(dp, bridge->dp_panel, adjusted_mode,
&bridge->dp_mode);
dp->clear_reservation(dp, bridge->dp_panel);
}
static bool dp_bridge_mode_fixup(struct drm_bridge *drm_bridge,
@@ -289,6 +292,7 @@ static bool dp_bridge_mode_fixup(struct drm_bridge *drm_bridge,
dp = bridge->display;
dp->convert_to_dp_mode(dp, bridge->dp_panel, mode, &dp_mode);
dp->clear_reservation(dp, bridge->dp_panel);
convert_to_drm_mode(&dp_mode, adjusted_mode);
end:
return ret;