Currently, two types of flush commands are queued to the firmware, the first flush queued as part of sequence change, does not wait for a response, while the second flush queued as part of stop, expects a completion response before proceeding further.
Due to timing issue, the flush response corresponding to the first command could arrive after the second flush is issued. This casuses the driver to incorrectly assume that the second flush has completed, leading to the premature signaling of flush_completion.
To address this, introduce a counter to track the number of pending flush responses and signal flush completion only when all expected responses are received.
Cc: stable@vger.kernel.org Fixes: 11712ce70f8e ("media: iris: implement vb2 streaming ops") Signed-off-by: Dikshita Agarwal quic_dikshita@quicinc.com --- .../media/platform/qcom/iris/iris_hfi_gen1_command.c | 4 +++- .../media/platform/qcom/iris/iris_hfi_gen1_response.c | 17 +++++++++++------ drivers/media/platform/qcom/iris/iris_instance.h | 2 ++ 3 files changed, 16 insertions(+), 7 deletions(-)
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 f9f3e2d2ce29..ef3ca676d2ea 100644 --- a/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c @@ -208,8 +208,10 @@ static int iris_hfi_gen1_session_stop(struct iris_inst *inst, u32 plane) flush_pkt.flush_type = flush_type;
ret = iris_hfi_queue_cmd_write(core, &flush_pkt, flush_pkt.shdr.hdr.size); - if (!ret) + if (!ret) { + inst->flush_responses_pending++; ret = iris_wait_for_session_response(inst, true); + } }
return ret; diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen1_response.c b/drivers/media/platform/qcom/iris/iris_hfi_gen1_response.c index dfca45d85759..01338baf3788 100644 --- a/drivers/media/platform/qcom/iris/iris_hfi_gen1_response.c +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen1_response.c @@ -207,7 +207,8 @@ static void iris_hfi_gen1_event_seq_changed(struct iris_inst *inst, flush_pkt.shdr.hdr.pkt_type = HFI_CMD_SESSION_FLUSH; flush_pkt.shdr.session_id = inst->session_id; flush_pkt.flush_type = HFI_FLUSH_OUTPUT; - iris_hfi_queue_cmd_write(inst->core, &flush_pkt, flush_pkt.shdr.hdr.size); + if (!iris_hfi_queue_cmd_write(inst->core, &flush_pkt, flush_pkt.shdr.hdr.size)) + inst->flush_responses_pending++; }
iris_vdec_src_change(inst); @@ -408,7 +409,9 @@ static void iris_hfi_gen1_session_ftb_done(struct iris_inst *inst, void *packet) flush_pkt.shdr.hdr.pkt_type = HFI_CMD_SESSION_FLUSH; flush_pkt.shdr.session_id = inst->session_id; flush_pkt.flush_type = HFI_FLUSH_OUTPUT; - iris_hfi_queue_cmd_write(core, &flush_pkt, flush_pkt.shdr.hdr.size); + if (!iris_hfi_queue_cmd_write(core, &flush_pkt, flush_pkt.shdr.hdr.size)) + inst->flush_responses_pending++; + iris_inst_sub_state_change_drain_last(inst);
return; @@ -570,7 +573,6 @@ static void iris_hfi_gen1_handle_response(struct iris_core *core, void *response const struct iris_hfi_gen1_response_pkt_info *pkt_info; struct device *dev = core->dev; struct hfi_session_pkt *pkt; - struct completion *done; struct iris_inst *inst; bool found = false; u32 i; @@ -631,9 +633,12 @@ static void iris_hfi_gen1_handle_response(struct iris_core *core, void *response if (shdr->error_type != HFI_ERR_NONE) iris_inst_change_state(inst, IRIS_INST_ERROR);
- done = pkt_info->pkt == HFI_MSG_SESSION_FLUSH ? - &inst->flush_completion : &inst->completion; - complete(done); + if (pkt_info->pkt == HFI_MSG_SESSION_FLUSH) { + if (--inst->flush_responses_pending <= 0) + complete(&inst->flush_completion); + } else { + complete(&inst->completion); + } } mutex_unlock(&inst->lock);
diff --git a/drivers/media/platform/qcom/iris/iris_instance.h b/drivers/media/platform/qcom/iris/iris_instance.h index 5150237f0020..9ed197799ee7 100644 --- a/drivers/media/platform/qcom/iris/iris_instance.h +++ b/drivers/media/platform/qcom/iris/iris_instance.h @@ -27,6 +27,7 @@ * @crop: structure of crop info * @completion: structure of signal completions * @flush_completion: structure of signal completions for flush cmd + * @flush_responses_pending: counter to track number of pending flush responses * @fw_caps: array of supported instance firmware capabilities * @buffers: array of different iris buffers * @fw_min_count: minimnum count of buffers needed by fw @@ -59,6 +60,7 @@ struct iris_inst { struct iris_hfi_rect_desc crop; struct completion completion; struct completion flush_completion; + u32 flush_responses_pending; struct platform_inst_fw_cap fw_caps[INST_FW_CAP_MAX]; struct iris_buffers buffers[BUF_TYPE_MAX]; u32 fw_min_count;