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disp: msm: sde: revert to previous smmu state upon failure to switch

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This change saves the previous state before moving into the transitional
smmu state, during secure-display/secure-camera usecases. Upon failure
to complete the transition, set smmu state to the previous state.
Previously, smmu state was staying in transitional state.

Change-Id: I1a78ddcf6ac1c7ea66c8c2095cd1a6d6160647a1
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
This commit is contained in:
Samantha Tran
2019-08-30 17:05:56 -07:00
parent 685240ed01
commit ad97f0cf4d
3 changed files with 21 additions and 5 deletions
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22
msm/sde/sde_kms.c
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@@ -528,12 +528,24 @@ static int _sde_kms_secure_ctrl(struct sde_kms *sde_kms, struct drm_crtc *crtc,
end:
smmu_state->sui_misr_state = NONE;
smmu_state->transition_type = NONE;
smmu_state->transition_error = ret ? true : false;
smmu_state->transition_error = false;
SDE_DEBUG("crtc %d: old_state %d, new_state %d, sec_lvl %d, ret %d\n",
DRMID(crtc), old_smmu_state, smmu_state->state,
smmu_state->secure_level, ret);
SDE_EVT32(DRMID(crtc), smmu_state->state, smmu_state->transition_type,
/*
* If switch failed, toggling secure_level is enough since
* there are only two secure levels - secure/non-secure
*/
if (ret) {
smmu_state->transition_error = true;
smmu_state->state = smmu_state->prev_state;
smmu_state->secure_level = !smmu_state->secure_level;
}
SDE_DEBUG(
"crtc %d: old_state %d, req_state %d, new_state %d, sec_lvl %d, ret %d\n",
DRMID(crtc), smmu_state->prev_state, old_smmu_state,
smmu_state->state, smmu_state->secure_level, ret);
SDE_EVT32(DRMID(crtc), smmu_state->prev_state,
smmu_state->state, smmu_state->transition_type,
smmu_state->transition_error, smmu_state->secure_level,
smmu_state->sui_misr_state, ret, SDE_EVTLOG_FUNC_EXIT);