From: Nicholas Kazlauskas nicholas.kazlauskas@amd.com
commit 1210b17dd4ece454d68a9283f391e3b036aeb010 upstream.
[Why] DMCUB will hang if we send a PSR unsupported set version command.
This can occur if we fall-through into the default case in the switch statement for PSR version.
[How] Add an unsupported check after the switch statement.
Tested-by: Daniel Wheeler daniel.wheeler@amd.com Reviewed-by: Anthony Koo Anthony.Koo@amd.com Acked-by: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Signed-off-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Cc: "Limonciello, Mario" Mario.Limonciello@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c @@ -138,6 +138,10 @@ static bool dmub_psr_set_version(struct cmd.psr_set_version.psr_set_version_data.version = PSR_VERSION_UNSUPPORTED; break; } + + if (cmd.psr_set_version.psr_set_version_data.version == PSR_VERSION_UNSUPPORTED) + return false; + cmd.psr_set_version.psr_set_version_data.cmd_version = DMUB_CMD_PSR_CONTROL_VERSION_1; cmd.psr_set_version.psr_set_version_data.panel_inst = panel_inst; cmd.psr_set_version.header.payload_bytes = sizeof(struct dmub_cmd_psr_set_version_data);