media: imx-jpeg: Support to assign slot for encoder/decoder

imx jpeg encoder and decoder support 4 slots each,
aim to support some virtualization scenarios.

driver should only enable one slot one time.

but due to some hardware issue,
only slot 0 can be enabled in imx8q platform,
and they may be fixed in imx9 platform.

Signed-off-by: Ming Qian <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.h

···
 #define CAST_OFBSIZE_LO			CAST_STATUS18
 #define CAST_OFBSIZE_HI			CAST_STATUS19
 
-#define MXC_MAX_SLOTS	1 /* TODO use all 4 slots*/
 /* JPEG-Decoder Wrapper Slot Registers 0..3 */
 #define SLOT_BASE			0x10000
 #define SLOT_STATUS			0x0

drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c

···
 	v4l2_event_queue_fh(&ctx->fh, &ev);
 }
 
-static int mxc_get_free_slot(struct mxc_jpeg_slot_data slot_data[], int n)
+static int mxc_get_free_slot(struct mxc_jpeg_slot_data *slot_data)
 {
-	int free_slot = 0;
-
-	while (slot_data[free_slot].used && free_slot < n)
-		free_slot++;
-
-	return free_slot; /* >=n when there are no more free slots */
+	if (!slot_data->used)
+		return slot_data->slot;
+	return -1;
 }
 
-static bool mxc_jpeg_alloc_slot_data(struct mxc_jpeg_dev *jpeg,
-				     unsigned int slot)
+static bool mxc_jpeg_alloc_slot_data(struct mxc_jpeg_dev *jpeg)
 {
 	struct mxc_jpeg_desc *desc;
 	struct mxc_jpeg_desc *cfg_desc;
 	void *cfg_stm;
 
-	if (jpeg->slot_data[slot].desc)
+	if (jpeg->slot_data.desc)
 		goto skip_alloc; /* already allocated, reuse it */
 
 	/* allocate descriptor for decoding/encoding phase */
 	desc = dma_alloc_coherent(jpeg->dev,
 				  sizeof(struct mxc_jpeg_desc),
-				  &jpeg->slot_data[slot].desc_handle,
+				  &jpeg->slot_data.desc_handle,
 				  GFP_ATOMIC);
 	if (!desc)
 		goto err;
-	jpeg->slot_data[slot].desc = desc;
+	jpeg->slot_data.desc = desc;
 
 	/* allocate descriptor for configuration phase (encoder only) */
 	cfg_desc = dma_alloc_coherent(jpeg->dev,
 				      sizeof(struct mxc_jpeg_desc),
-				      &jpeg->slot_data[slot].cfg_desc_handle,
+				      &jpeg->slot_data.cfg_desc_handle,
 				      GFP_ATOMIC);
 	if (!cfg_desc)
 		goto err;
-	jpeg->slot_data[slot].cfg_desc = cfg_desc;
+	jpeg->slot_data.cfg_desc = cfg_desc;
 
 	/* allocate configuration stream */
 	cfg_stm = dma_alloc_coherent(jpeg->dev,
 				     MXC_JPEG_MAX_CFG_STREAM,
-				     &jpeg->slot_data[slot].cfg_stream_handle,
+				     &jpeg->slot_data.cfg_stream_handle,
 				     GFP_ATOMIC);
 	if (!cfg_stm)
 		goto err;
-	jpeg->slot_data[slot].cfg_stream_vaddr = cfg_stm;
+	jpeg->slot_data.cfg_stream_vaddr = cfg_stm;
 
 skip_alloc:
-	jpeg->slot_data[slot].used = true;
+	jpeg->slot_data.used = true;
 
 	return true;
 err:
-	dev_err(jpeg->dev, "Could not allocate descriptors for slot %d", slot);
+	dev_err(jpeg->dev, "Could not allocate descriptors for slot %d", jpeg->slot_data.slot);
 
 	return false;
 }
 
-static void mxc_jpeg_free_slot_data(struct mxc_jpeg_dev *jpeg,
-				    unsigned int slot)
+static void mxc_jpeg_free_slot_data(struct mxc_jpeg_dev *jpeg)
 {
-	if (slot >= MXC_MAX_SLOTS) {
-		dev_err(jpeg->dev, "Invalid slot %d, nothing to free.", slot);
-		return;
-	}
-
 	/* free descriptor for decoding/encoding phase */
 	dma_free_coherent(jpeg->dev, sizeof(struct mxc_jpeg_desc),
-			  jpeg->slot_data[slot].desc,
-			  jpeg->slot_data[slot].desc_handle);
+			  jpeg->slot_data.desc,
+			  jpeg->slot_data.desc_handle);
 
 	/* free descriptor for encoder configuration phase / decoder DHT */
 	dma_free_coherent(jpeg->dev, sizeof(struct mxc_jpeg_desc),
-			  jpeg->slot_data[slot].cfg_desc,
-			  jpeg->slot_data[slot].cfg_desc_handle);
+			  jpeg->slot_data.cfg_desc,
+			  jpeg->slot_data.cfg_desc_handle);
 
 	/* free configuration stream */
 	dma_free_coherent(jpeg->dev, MXC_JPEG_MAX_CFG_STREAM,
-			  jpeg->slot_data[slot].cfg_stream_vaddr,
-			  jpeg->slot_data[slot].cfg_stream_handle);
+			  jpeg->slot_data.cfg_stream_vaddr,
+			  jpeg->slot_data.cfg_stream_handle);
 
-	jpeg->slot_data[slot].used = false;
+	jpeg->slot_data.used = false;
 }
 
 static void mxc_jpeg_check_and_set_last_buffer(struct mxc_jpeg_ctx *ctx,
···
 	v4l2_m2m_buf_done(dst_buf, state);
 
 	mxc_jpeg_disable_irq(reg, ctx->slot);
-	ctx->mxc_jpeg->slot_data[ctx->slot].used = false;
+	jpeg->slot_data.used = false;
 	if (reset)
 		mxc_jpeg_sw_reset(reg);
 }
···
 		goto job_unlock;
 	}
 
-	if (!jpeg->slot_data[slot].used)
+	if (!jpeg->slot_data.used)
 		goto job_unlock;
 
 	dec_ret = readl(reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS));
···
 	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
 	void __iomem *reg = jpeg->base_reg;
 	unsigned int slot = ctx->slot;
-	struct mxc_jpeg_desc *desc = jpeg->slot_data[slot].desc;
-	struct mxc_jpeg_desc *cfg_desc = jpeg->slot_data[slot].cfg_desc;
-	dma_addr_t desc_handle = jpeg->slot_data[slot].desc_handle;
-	dma_addr_t cfg_desc_handle = jpeg->slot_data[slot].cfg_desc_handle;
-	dma_addr_t cfg_stream_handle = jpeg->slot_data[slot].cfg_stream_handle;
-	unsigned int *cfg_size = &jpeg->slot_data[slot].cfg_stream_size;
-	void *cfg_stream_vaddr = jpeg->slot_data[slot].cfg_stream_vaddr;
+	struct mxc_jpeg_desc *desc = jpeg->slot_data.desc;
+	struct mxc_jpeg_desc *cfg_desc = jpeg->slot_data.cfg_desc;
+	dma_addr_t desc_handle = jpeg->slot_data.desc_handle;
+	dma_addr_t cfg_desc_handle = jpeg->slot_data.cfg_desc_handle;
+	dma_addr_t cfg_stream_handle = jpeg->slot_data.cfg_stream_handle;
+	unsigned int *cfg_size = &jpeg->slot_data.cfg_stream_size;
+	void *cfg_stream_vaddr = jpeg->slot_data.cfg_stream_vaddr;
 	struct mxc_jpeg_src_buf *jpeg_src_buf;
 
 	jpeg_src_buf = vb2_to_mxc_buf(src_buf);
···
 	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
 	void __iomem *reg = jpeg->base_reg;
 	unsigned int slot = ctx->slot;
-	struct mxc_jpeg_desc *desc = jpeg->slot_data[slot].desc;
-	struct mxc_jpeg_desc *cfg_desc = jpeg->slot_data[slot].cfg_desc;
-	dma_addr_t desc_handle = jpeg->slot_data[slot].desc_handle;
-	dma_addr_t cfg_desc_handle = jpeg->slot_data[slot].cfg_desc_handle;
-	void *cfg_stream_vaddr = jpeg->slot_data[slot].cfg_stream_vaddr;
+	struct mxc_jpeg_desc *desc = jpeg->slot_data.desc;
+	struct mxc_jpeg_desc *cfg_desc = jpeg->slot_data.cfg_desc;
+	dma_addr_t desc_handle = jpeg->slot_data.desc_handle;
+	dma_addr_t cfg_desc_handle = jpeg->slot_data.cfg_desc_handle;
+	void *cfg_stream_vaddr = jpeg->slot_data.cfg_stream_vaddr;
 	struct mxc_jpeg_q_data *q_data;
 	enum mxc_jpeg_image_format img_fmt;
 	int w, h;
 
 	q_data = mxc_jpeg_get_q_data(ctx, src_buf->vb2_queue->type);
 
-	jpeg->slot_data[slot].cfg_stream_size =
+	jpeg->slot_data.cfg_stream_size =
 			mxc_jpeg_setup_cfg_stream(cfg_stream_vaddr,
 						  q_data->fmt->fourcc,
 						  q_data->crop.width,
···
 	/* chain the config descriptor with the encoding descriptor */
 	cfg_desc->next_descpt_ptr = desc_handle | MXC_NXT_DESCPT_EN;
 
-	cfg_desc->buf_base0 = jpeg->slot_data[slot].cfg_stream_handle;
+	cfg_desc->buf_base0 = jpeg->slot_data.cfg_stream_handle;
 	cfg_desc->buf_base1 = 0;
 	cfg_desc->line_pitch = 0;
 	cfg_desc->stm_bufbase = 0; /* no output expected */
···
 	unsigned long flags;
 
 	spin_lock_irqsave(&ctx->mxc_jpeg->hw_lock, flags);
-	if (ctx->slot < MXC_MAX_SLOTS && ctx->mxc_jpeg->slot_data[ctx->slot].used) {
+	if (ctx->mxc_jpeg->slot_data.used) {
 		dev_warn(jpeg->dev, "%s timeout, cancel it\n",
 			 ctx->mxc_jpeg->mode == MXC_JPEG_DECODE ? "decode" : "encode");
 		mxc_jpeg_job_finish(ctx, VB2_BUF_STATE_ERROR, true);
···
 	mxc_jpeg_enable(reg);
 	mxc_jpeg_set_l_endian(reg, 1);
 
-	ctx->slot = mxc_get_free_slot(jpeg->slot_data, MXC_MAX_SLOTS);
-	if (ctx->slot >= MXC_MAX_SLOTS) {
+	ctx->slot = mxc_get_free_slot(&jpeg->slot_data);
+	if (ctx->slot < 0) {
 		dev_err(dev, "No more free slots\n");
 		goto end;
 	}
-	if (!mxc_jpeg_alloc_slot_data(jpeg, ctx->slot)) {
+	if (!mxc_jpeg_alloc_slot_data(jpeg)) {
 		dev_err(dev, "Cannot allocate slot data\n");
 		goto end;
 	}
···
 	}
 	ctx->fh.ctrl_handler = &ctx->ctrl_handler;
 	mxc_jpeg_set_default_params(ctx);
-	ctx->slot = MXC_MAX_SLOTS; /* slot not allocated yet */
+	ctx->slot = -1; /* slot not allocated yet */
 	INIT_DELAYED_WORK(&ctx->task_timer, mxc_jpeg_device_run_timeout);
 
 	if (mxc_jpeg->mode == MXC_JPEG_DECODE)
···
 		dev_err(dev, "No power domains defined for jpeg node\n");
 		return jpeg->num_domains;
 	}
+	if (jpeg->num_domains == 1) {
+		/* genpd_dev_pm_attach() attach automatically if power domains count is 1 */
+		jpeg->num_domains = 0;
+		return 0;
+	}
 
 	jpeg->pd_dev = devm_kmalloc_array(dev, jpeg->num_domains,
 					  sizeof(*jpeg->pd_dev), GFP_KERNEL);
···
 	int ret;
 	int mode;
 	const struct of_device_id *of_id;
-	unsigned int slot;
 
 	of_id = of_match_node(mxc_jpeg_match, dev->of_node);
 	if (!of_id)
···
 	if (IS_ERR(jpeg->base_reg))
 		return PTR_ERR(jpeg->base_reg);
 
-	for (slot = 0; slot < MXC_MAX_SLOTS; slot++) {
-		dec_irq = platform_get_irq(pdev, slot);
-		if (dec_irq < 0) {
-			ret = dec_irq;
-			goto err_irq;
-		}
-		ret = devm_request_irq(&pdev->dev, dec_irq, mxc_jpeg_dec_irq,
-				       0, pdev->name, jpeg);
-		if (ret) {
-			dev_err(&pdev->dev, "Failed to request irq %d (%d)\n",
-				dec_irq, ret);
-			goto err_irq;
-		}
+	ret = of_property_read_u32_index(pdev->dev.of_node, "slot", 0, &jpeg->slot_data.slot);
+	if (ret)
+		jpeg->slot_data.slot = 0;
+	dev_info(&pdev->dev, "choose slot %d\n", jpeg->slot_data.slot);
+	dec_irq = platform_get_irq(pdev, 0);
+	if (dec_irq < 0) {
+		dev_err(&pdev->dev, "Failed to get irq %d\n", dec_irq);
+		ret = dec_irq;
+		goto err_irq;
+	}
+	ret = devm_request_irq(&pdev->dev, dec_irq, mxc_jpeg_dec_irq,
+			       0, pdev->name, jpeg);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to request irq %d (%d)\n",
+			dec_irq, ret);
+		goto err_irq;
 	}
 
 	jpeg->pdev = pdev;
···
 
 static void mxc_jpeg_remove(struct platform_device *pdev)
 {
-	unsigned int slot;
 	struct mxc_jpeg_dev *jpeg = platform_get_drvdata(pdev);
 
-	for (slot = 0; slot < MXC_MAX_SLOTS; slot++)
-		mxc_jpeg_free_slot_data(jpeg, slot);
+	mxc_jpeg_free_slot_data(jpeg);
 
 	pm_runtime_disable(&pdev->dev);
 	video_unregister_device(jpeg->dec_vdev);

drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.h

···
 	struct mxc_jpeg_q_data		cap_q;
 	struct v4l2_fh			fh;
 	enum mxc_jpeg_enc_state		enc_state;
-	unsigned int			slot;
+	int				slot;
 	unsigned int			source_change;
 	bool				header_parsed;
 	struct v4l2_ctrl_handler	ctrl_handler;
···
 };
 
 struct mxc_jpeg_slot_data {
+	int slot;
 	bool used;
 	struct mxc_jpeg_desc *desc; // enc/dec descriptor
 	struct mxc_jpeg_desc *cfg_desc; // configuration descriptor
···
 	struct v4l2_device		v4l2_dev;
 	struct v4l2_m2m_dev		*m2m_dev;
 	struct video_device		*dec_vdev;
-	struct mxc_jpeg_slot_data	slot_data[MXC_MAX_SLOTS];
+	struct mxc_jpeg_slot_data	slot_data;
 	int				num_domains;
 	struct device			**pd_dev;
 	struct device_link		**pd_link;