drm/amd/display: Fix resetting DCN3.1 HW when resuming from S4

[Why] On S4 resume we also need to fix detection of when to reload DMCUB
firmware because we're currently using the VBIOS version which isn't
compatible with the driver version.

[How] Update the hardware init check for DCN31 since it's the ASIC that
has this issue.

Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Jude Shih <jude.shih@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c
index 6144617..6820012 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c
@@ -270,11 +270,13 @@ void dmub_dcn31_set_outbox1_rptr(struct dmub_srv *dmub, uint32_t rptr_offset)
 
 bool dmub_dcn31_is_hw_init(struct dmub_srv *dmub)
 {
-       uint32_t is_hw_init;
+       union dmub_fw_boot_status status;
+       uint32_t is_enable;
 
-       REG_GET(DMCUB_CNTL, DMCUB_ENABLE, &is_hw_init);
+       status.all = REG_READ(DMCUB_SCRATCH0);
+       REG_GET(DMCUB_CNTL, DMCUB_ENABLE, &is_enable);
 
-       return is_hw_init != 0;
+       return is_enable != 0 && status.bits.dal_fw;
 }
 
 bool dmub_dcn31_is_supported(struct dmub_srv *dmub)