[PATCH v3 29/29] media: iris: add check to allow sub states transitions

Dikshita Agarwal via B4 Relay
2024-08-27T10:06:37Z

From: Vedang Nagar <quic_vnagar@quicinc.com>

Based on state machine design, add allow checks to
transition from one sub-state to another sub-states.

Signed-off-by: Vedang Nagar <quic_vnagar@quicinc.com>
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
---
.../platform/qcom/iris/iris_hfi_gen1_command.c | 12 ++++++-
drivers/media/platform/qcom/iris/iris_state.c | 42 ++++++++++++++++++++++
drivers/media/platform/qcom/iris/iris_state.h | 1 +
3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c b/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c
index 17333768afa2..2f3e40368cce 100644
--- a/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c
+++ b/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c
@@ -135,6 +135,9 @@ static int iris_hfi_gen1_session_start(struct iris_inst *inst, u32 plane)
if (!V4L2_TYPE_IS_OUTPUT(plane))
return 0;

+ if (inst->sub_state & IRIS_INST_SUB_LOAD_RESOURCES)
+ return 0;
+
reinit_completion(&inst->completion);
iris_hfi_gen1_packet_session_cmd(inst, &packet, HFI_CMD_SESSION_LOAD_RESOURCES);

@@ -153,7 +156,11 @@ static int iris_hfi_gen1_session_start(struct iris_inst *inst, u32 plane)
if (ret)
return ret;

- return iris_wait_for_session_response(inst, false);
+ ret = iris_wait_for_session_response(inst, false);
+ if (ret)
+ return ret;
+
+ return iris_inst_change_sub_state(inst, 0, IRIS_INST_SUB_LOAD_RESOURCES);
}

static int iris_hfi_gen1_session_stop(struct iris_inst *inst, u32 plane)
@@ -180,6 +187,9 @@ static int iris_hfi_gen1_session_stop(struct iris_inst *inst, u32 plane)
ret = iris_hfi_queue_cmd_write(core, &pkt, pkt.shdr.hdr.size);
if (!ret)
ret = iris_wait_for_session_response(inst, false);
+
+ iris_inst_change_sub_state(inst, IRIS_INST_SUB_LOAD_RESOURCES, 0);
+
iris_helper_buffers_done(inst, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
VB2_BUF_STATE_ERROR);
iris_helper_buffers_done(inst, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
diff --git a/drivers/media/platform/qcom/iris/iris_state.c b/drivers/media/platform/qcom/iris/iris_state.c
index 1c7437bc808b..ab7dc768ef25 100644
--- a/drivers/media/platform/qcom/iris/iris_state.c
+++ b/drivers/media/platform/qcom/iris/iris_state.c
@@ -165,6 +165,45 @@ int iris_inst_state_change_streamoff(struct iris_inst *inst, u32 plane)
return iris_inst_change_state(inst, new_state);
}

+static int iris_inst_allow_sub_state(struct iris_inst *inst, enum iris_inst_sub_state sub_state)
+{
+ if (!sub_state)
+ return true;
+
+ switch (inst->state) {
+ case IRIS_INST_INIT:
+ if (sub_state & IRIS_INST_SUB_LOAD_RESOURCES)
+ return true;
+ break;
+ case IRIS_INST_INPUT_STREAMING:
+ if (sub_state & (IRIS_INST_SUB_FIRST_IPSC | IRIS_INST_SUB_DRC |
+ IRIS_INST_SUB_DRAIN | IRIS_INST_SUB_INPUT_PAUSE))
+ return true;
+ break;
+ case IRIS_INST_OUTPUT_STREAMING:
+ if (sub_state & (IRIS_INST_SUB_DRC_LAST |
+ IRIS_INST_SUB_DRAIN_LAST | IRIS_INST_SUB_OUTPUT_PAUSE))
+ return true;
+ break;
+ case IRIS_INST_STREAMING:
+ if (sub_state & (IRIS_INST_SUB_DRC | IRIS_INST_SUB_DRAIN |
+ IRIS_INST_SUB_DRC_LAST | IRIS_INST_SUB_DRAIN_LAST |
+ IRIS_INST_SUB_INPUT_PAUSE | IRIS_INST_SUB_OUTPUT_PAUSE))
+ return true;
+ break;
+ case IRIS_INST_DEINIT:
+ if (sub_state & (IRIS_INST_SUB_DRC | IRIS_INST_SUB_DRAIN |
+ IRIS_INST_SUB_DRC_LAST | IRIS_INST_SUB_DRAIN_LAST |
+ IRIS_INST_SUB_INPUT_PAUSE | IRIS_INST_SUB_OUTPUT_PAUSE))
+ return true;
+ break;
+ default:
+ return false;
+ }
+
+ return false;
+}
+
int iris_inst_change_sub_state(struct iris_inst *inst,
enum iris_inst_sub_state clear_sub_state,
enum iris_inst_sub_state set_sub_state)
@@ -184,6 +223,9 @@ int iris_inst_change_sub_state(struct iris_inst *inst,

prev_sub_state = inst->sub_state;

+ if (!iris_inst_allow_sub_state(inst, set_sub_state))
+ return -EINVAL;
+
inst->sub_state |= set_sub_state;
inst->sub_state &= ~clear_sub_state;

diff --git a/drivers/media/platform/qcom/iris/iris_state.h b/drivers/media/platform/qcom/iris/iris_state.h
index 9516425fcfa7..f60dc18ca30e 100644
--- a/drivers/media/platform/qcom/iris/iris_state.h
+++ b/drivers/media/platform/qcom/iris/iris_state.h
@@ -124,6 +124,7 @@ enum iris_inst_sub_state {
IRIS_INST_SUB_DRAIN_LAST = BIT(4),
IRIS_INST_SUB_INPUT_PAUSE = BIT(5),
IRIS_INST_SUB_OUTPUT_PAUSE = BIT(6),
+ IRIS_INST_SUB_LOAD_RESOURCES = BIT(7),
};

void iris_change_core_state(struct iris_core *core,

--
2.34.1