media: venus: vdec: Handle DRC after drain

If the DRC is near the end of the stream the client
may send a V4L2_DEC_CMD_STOP before the DRC occurs.
V4L2_DEC_CMD_STOP puts the driver into the
VENUS_DEC_STATE_DRAIN state.  DRC must be aware so
that after the DRC event the state can be restored
correctly.
Signed-off-by: Fritz Koenig <frkoenig@chromium.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/qcom/venus/core.h

@@ -413,6 +413,7 @@ struct venus_inst {
 	unsigned int core_acquired: 1;
 	unsigned int bit_depth;
 	bool next_buf_last;
+	bool drain_active;
 };
 
 #define IS_V1(core)	((core)->res->hfi_version == HFI_VERSION_1XX)

drivers/media/platform/qcom/venus/vdec.c

@@ -519,8 +519,10 @@ vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
 
 		ret = hfi_session_process_buf(inst, &fdata);
 
-		if (!ret && inst->codec_state == VENUS_DEC_STATE_DECODING)
+		if (!ret && inst->codec_state == VENUS_DEC_STATE_DECODING) {
 			inst->codec_state = VENUS_DEC_STATE_DRAIN;
+			inst->drain_active = true;
+		}
 	}
 
 unlock:
@@ -970,9 +972,13 @@ static int vdec_start_capture(struct venus_inst *inst)
 
 	inst->codec_state = VENUS_DEC_STATE_DECODING;
 
+	if (inst->drain_active)
+		inst->codec_state = VENUS_DEC_STATE_DRAIN;
+
 	inst->streamon_cap = 1;
 	inst->sequence_cap = 0;
 	inst->reconfig = false;
+	inst->drain_active = false;
 
 	return 0;
 
@@ -1098,6 +1104,7 @@ static int vdec_stop_capture(struct venus_inst *inst)
 		fallthrough;
 	case VENUS_DEC_STATE_DRAIN:
 		inst->codec_state = VENUS_DEC_STATE_STOPPED;
+		inst->drain_active = false;
 		fallthrough;
 	case VENUS_DEC_STATE_SEEK:
 		vdec_cancel_dst_buffers(inst);
@@ -1297,8 +1304,10 @@ static void vdec_buf_done(struct venus_inst *inst, unsigned int buf_type,
 
 			v4l2_event_queue_fh(&inst->fh, &ev);
 
-			if (inst->codec_state == VENUS_DEC_STATE_DRAIN)
+			if (inst->codec_state == VENUS_DEC_STATE_DRAIN) {
+				inst->drain_active = false;
 				inst->codec_state = VENUS_DEC_STATE_STOPPED;
+			}
 		}
 
 		if (!bytesused)
@@ -1374,6 +1383,7 @@ static void vdec_event_change(struct venus_inst *inst,
 		inst->codec_state = VENUS_DEC_STATE_CAPTURE_SETUP;
 		break;
 	case VENUS_DEC_STATE_DECODING:
+	case VENUS_DEC_STATE_DRAIN:
 		inst->codec_state = VENUS_DEC_STATE_DRC;
 		break;
 	default: