media: mtk-vcodec: venc: handle firmware version field

Firmwares for encoders newer than MT8173 will include an ABI version
number in their initialization ack message. Add the capacity to manage
it and make initialization fail if the firmware ABI is of a version that
we don't support.

For MT8173, this ABI version field is reserved and thus undefined ; thus
ignore it on this chip. There should only be one firmware version available
for it anyway.
Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Acked-by: Tiffany Lin <tiffany.lin@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h

@@ -300,13 +300,21 @@ struct mtk_vcodec_ctx {
 
 };
 
+enum mtk_chip {
+	MTK_MT8173,
+};
+
 /**
  * struct mtk_vcodec_enc_pdata - compatible data for each IC
  *
+ * @chip: chip this encoder is compatible with
+ *
  * @uses_ext: whether the encoder uses the extended firmware messaging format
  * @has_lt_irq: whether the encoder uses the LT irq
  */
 struct mtk_vcodec_enc_pdata {
+	enum mtk_chip chip;
+
 	bool uses_ext;
 	bool has_lt_irq;
 };

drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c

@@ -393,6 +393,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 }
 
 static const struct mtk_vcodec_enc_pdata mt8173_pdata = {
+	.chip = MTK_MT8173,
 	.has_lt_irq = true,
 };
 

drivers/media/platform/mtk-vcodec/venc_ipi_msg.h

@@ -138,16 +138,17 @@ struct venc_vpu_ipi_msg_common {
  * @venc_inst:	AP encoder instance (struct venc_vp8_inst/venc_h264_inst *)
  * @vpu_inst_addr:	VPU encoder instance addr
  *			(struct venc_vp8_vsi/venc_h264_vsi *)
- * @reserved:	reserved for future use. vpu is running in 32bit. Without
- *		this reserved field, if kernel run in 64bit. this struct size
- *		will be different between kernel and vpu
+ * @venc_abi_version:	ABI version of the firmware. Kernel can use it to
+ *			ensure that it is compatible with the firmware.
+ *			For MT8173 the value of this field is undefined and
+ *			should not be used.
  */
 struct venc_vpu_ipi_msg_init {
 	uint32_t msg_id;
 	uint32_t status;
 	uint64_t venc_inst;
 	uint32_t vpu_inst_addr;
-	uint32_t reserved;
+	uint32_t venc_abi_version;
 };
 
 /**

drivers/media/platform/mtk-vcodec/venc_vpu_if.c

@@ -4,6 +4,7 @@
  * Author: PoChun Lin <pochun.lin@mediatek.com>
  */
 
+#include "mtk_vcodec_drv.h"
 #include "mtk_vcodec_fw.h"
 #include "venc_ipi_msg.h"
 #include "venc_vpu_if.h"
@@ -15,6 +16,23 @@ static void handle_enc_init_msg(struct venc_vpu_inst *vpu, const void *data)
 	vpu->inst_addr = msg->vpu_inst_addr;
 	vpu->vsi = mtk_vcodec_fw_map_dm_addr(vpu->ctx->dev->fw_handler,
 					     msg->vpu_inst_addr);
+
+	/* Firmware version field value is unspecified on MT8173. */
+	if (vpu->ctx->dev->venc_pdata->chip == MTK_MT8173)
+		return;
+
+	/* Check firmware version. */
+	mtk_vcodec_debug(vpu, "firmware version: 0x%x\n",
+			 msg->venc_abi_version);
+	switch (msg->venc_abi_version) {
+	case 1:
+		break;
+	default:
+		mtk_vcodec_err(vpu, "unhandled firmware version 0x%x\n",
+			       msg->venc_abi_version);
+		vpu->failure = 1;
+		break;
+	}
 }
 
 static void handle_enc_encode_msg(struct venc_vpu_inst *vpu, const void *data)
@@ -35,6 +53,11 @@ static void vpu_enc_ipi_handler(void *data, unsigned int len, void *priv)
 	mtk_vcodec_debug(vpu, "msg_id %x inst %p status %d",
 			 msg->msg_id, vpu, msg->status);
 
+	vpu->signaled = 1;
+	vpu->failure = (msg->status != VENC_IPI_MSG_STATUS_OK);
+	if (vpu->failure)
+		goto failure;
+
 	switch (msg->msg_id) {
 	case VPU_IPIMSG_ENC_INIT_DONE:
 		handle_enc_init_msg(vpu, data);
@@ -51,9 +74,7 @@ static void vpu_enc_ipi_handler(void *data, unsigned int len, void *priv)
 		break;
 	}
 
-	vpu->signaled = 1;
-	vpu->failure = (msg->status != VENC_IPI_MSG_STATUS_OK);
-
+failure:
 	mtk_vcodec_debug_leave(vpu);
 }