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drm/amd/display: Prevent crash when disable stream 

commit 72d72e8fdd upstream.

[Why]
Disabling stream encoder invokes a function that no longer exists.

[How]
Check if the function declaration is NULL in disable stream encoder.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Chris Park <chris.park@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@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:
Chris Park 2024-03-05 17:41:15 -05:00 committed by Greg Kroah-Hartman
parent a5ca1be7f9
commit 2b17133a0a
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
View File

@ -1185,7 +1185,8 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx)
if (dccg) {
dccg->funcs->disable_symclk32_se(dccg, dp_hpo_inst);
dccg->funcs->set_dpstreamclk(dccg, REFCLK, tg->inst, dp_hpo_inst);
dccg->funcs->set_dtbclk_dto(dccg, &dto_params);
if (dccg && dccg->funcs->set_dtbclk_dto)
dccg->funcs->set_dtbclk_dto(dccg, &dto_params);
}
} else if (dccg && dccg->funcs->disable_symclk_se) {
dccg->funcs->disable_symclk_se(dccg, stream_enc->stream_enc_inst,