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drm/amd/display: explicitly set is_dsc_supported to false before use

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commit 63ad5371cd1e379519395c49a4b6a652c36c98e5 upstream.

When UBSAN is enabled a case is shown on unplugging the display that
this variable hasn't been initialized by `update_dsc_caps`, presumably
when the display was unplugged it wasn't copied from the DPCD.

Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1956497
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mario Limonciello 2022-01-05 12:48:16 -06:00 committed by Greg Kroah-Hartman
parent d5df26479c
commit ce258c74f8
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -5604,6 +5604,7 @@ static void update_dsc_caps(struct amdgpu_dm_connector *aconnector,
struct dsc_dec_dpcd_caps *dsc_caps)
{
stream->timing.flags.DSC = 0;
dsc_caps->is_dsc_supported = false;
if (aconnector->dc_link && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT) {
dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,