[media] s5p-fimc: mem2mem driver refactoring and cleanup

Register access functions refactored for camera capture interface
control. Removed the workqueue since it was only useful for FIFO
output mode which is not supported at this time.
Fixed errors on module unload. Comments and whitespace cleanup.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 148 insertions, 178 deletions

diff --git a/drivers/media/video/s5p-fimc/fimc-core.c b/drivers/media/video/s5p-fimc/fimc-core.c
index c56029ee6e31..fccab1398425 100644
--- a/drivers/media/video/s5p-fimc/fimc-core.c
+++ b/drivers/media/video/s5p-fimc/fimc-core.c
@@ -117,7 +117,7 @@ static struct fimc_fmt fimc_formats[] = {
 		.buff_cnt = 1,
 		.planes_cnt = 2
 	}
- };
+};
 
 static struct v4l2_queryctrl fimc_ctrls[] = {
 	{
@@ -127,16 +127,14 @@ static struct v4l2_queryctrl fimc_ctrls[] = {
 		.minimum	= 0,
 		.maximum	= 1,
 		.default_value	= 0,
-	},
-	{
+	}, {
 		.id		= V4L2_CID_VFLIP,
 		.type		= V4L2_CTRL_TYPE_BOOLEAN,
 		.name		= "Vertical flip",
 		.minimum	= 0,
 		.maximum	= 1,
 		.default_value	= 0,
-	},
-	{
+	}, {
 		.id		= V4L2_CID_ROTATE,
 		.type		= V4L2_CTRL_TYPE_INTEGER,
 		.name		= "Rotation (CCW)",
@@ -181,28 +179,23 @@ static int fimc_check_scaler_ratio(struct v4l2_rect *r, struct fimc_frame *f)
 
 static int fimc_get_scaler_factor(u32 src, u32 tar, u32 *ratio, u32 *shift)
 {
-	if (src >= tar * 64) {
+	u32 sh = 6;
+
+	if (src >= 64 * tar)
 		return -EINVAL;
-	} else if (src >= tar * 32) {
-		*ratio = 32;
-		*shift = 5;
-	} else if (src >= tar * 16) {
-		*ratio = 16;
-		*shift = 4;
-	} else if (src >= tar * 8) {
-		*ratio = 8;
-		*shift = 3;
-	} else if (src >= tar * 4) {
-		*ratio = 4;
-		*shift = 2;
-	} else if (src >= tar * 2) {
-		*ratio = 2;
-		*shift = 1;
-	} else {
-		*ratio = 1;
-		*shift = 0;
+
+	while (sh--) {
+		u32 tmp = 1 << sh;
+		if (src >= tar * tmp) {
+			*shift = sh, *ratio = tmp;
+			return 0;
+		}
 	}
 
+	*shift = 0, *ratio = 1;
+
+	dbg("s: %d, t: %d, shift: %d, ratio: %d",
+	    src, tar, *shift, *ratio);
 	return 0;
 }
 
@@ -265,8 +258,8 @@ static int fimc_set_scaler_info(struct fimc_ctx *ctx)
 static irqreturn_t fimc_isr(int irq, void *priv)
 {
 	struct fimc_vid_buffer *src_buf, *dst_buf;
-	struct fimc_dev *fimc = (struct fimc_dev *)priv;
 	struct fimc_ctx *ctx;
+	struct fimc_dev *fimc = priv;
 
 	BUG_ON(!fimc);
 	fimc_hw_clear_irq(fimc);
@@ -281,7 +274,7 @@ static irqreturn_t fimc_isr(int irq, void *priv)
 		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
 		if (src_buf && dst_buf) {
 			spin_lock(&fimc->irqlock);
-			src_buf->vb.state = dst_buf->vb.state =  VIDEOBUF_DONE;
+			src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE;
 			wake_up(&src_buf->vb.done);
 			wake_up(&dst_buf->vb.done);
 			spin_unlock(&fimc->irqlock);
@@ -295,20 +288,13 @@ isr_unlock:
 }
 
 /* The color format (planes_cnt, buff_cnt) must be already configured. */
-static int fimc_prepare_addr(struct fimc_ctx *ctx,
-		struct fimc_vid_buffer *buf, enum v4l2_buf_type type)
+int fimc_prepare_addr(struct fimc_ctx *ctx, struct fimc_vid_buffer *buf,
+		      struct fimc_frame *frame, struct fimc_addr *paddr)
 {
-	struct fimc_frame *frame;
-	struct fimc_addr *paddr;
-	u32 pix_size;
 	int ret = 0;
+	u32 pix_size;
 
-	frame = ctx_m2m_get_frame(ctx, type);
-	if (IS_ERR(frame))
-		return PTR_ERR(frame);
-	paddr = &frame->paddr;
-
-	if (!buf)
+	if (buf == NULL || frame == NULL)
 		return -EINVAL;
 
 	pix_size = frame->width * frame->height;
@@ -344,8 +330,8 @@ static int fimc_prepare_addr(struct fimc_ctx *ctx,
 		}
 	}
 
-	dbg("PHYS_ADDR: type= %d, y= 0x%X  cb= 0x%X cr= 0x%X ret= %d",
-	type, paddr->y, paddr->cb, paddr->cr, ret);
+	dbg("PHYS_ADDR: y= 0x%X  cb= 0x%X cr= 0x%X ret= %d",
+	    paddr->y, paddr->cb, paddr->cr, ret);
 
 	return ret;
 }
@@ -466,16 +452,14 @@ static int fimc_prepare_config(struct fimc_ctx *ctx, u32 flags)
 
 	if (flags & FIMC_SRC_ADDR) {
 		buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
-		ret = fimc_prepare_addr(ctx, buf,
-			V4L2_BUF_TYPE_VIDEO_OUTPUT);
+		ret = fimc_prepare_addr(ctx, buf, s_frame, &s_frame->paddr);
 		if (ret)
 			return ret;
 	}
 
 	if (flags & FIMC_DST_ADDR) {
 		buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
-		ret = fimc_prepare_addr(ctx, buf,
-			V4L2_BUF_TYPE_VIDEO_CAPTURE);
+		ret = fimc_prepare_addr(ctx, buf, d_frame, &d_frame->paddr);
 	}
 
 	return ret;
@@ -499,12 +483,14 @@ static void fimc_dma_run(void *priv)
 	ctx->state |= (FIMC_SRC_ADDR | FIMC_DST_ADDR);
 	ret = fimc_prepare_config(ctx, ctx->state);
 	if (ret) {
-		err("general configuration error");
+		err("Wrong parameters");
 		goto dma_unlock;
 	}
-
-	if (fimc->m2m.ctx != ctx)
+	/* Reconfigure hardware if the context has changed. */
+	if (fimc->m2m.ctx != ctx) {
 		ctx->state |= FIMC_PARAMS;
+		fimc->m2m.ctx = ctx;
+	}
 
 	fimc_hw_set_input_addr(fimc, &ctx->s_frame.paddr);
 
@@ -512,10 +498,9 @@ static void fimc_dma_run(void *priv)
 		fimc_hw_set_input_path(ctx);
 		fimc_hw_set_in_dma(ctx);
 		if (fimc_set_scaler_info(ctx)) {
-			err("scaler configuration error");
+			err("Scaler setup error");
 			goto dma_unlock;
 		}
-		fimc_hw_set_prescaler(ctx);
 		fimc_hw_set_scaler(ctx);
 		fimc_hw_set_target_format(ctx);
 		fimc_hw_set_rotation(ctx);
@@ -524,19 +509,15 @@ static void fimc_dma_run(void *priv)
 
 	fimc_hw_set_output_path(ctx);
 	if (ctx->state & (FIMC_DST_ADDR | FIMC_PARAMS))
-		fimc_hw_set_output_addr(fimc, &ctx->d_frame.paddr);
+		fimc_hw_set_output_addr(fimc, &ctx->d_frame.paddr, -1);
 
 	if (ctx->state & FIMC_PARAMS)
 		fimc_hw_set_out_dma(ctx);
 
-	if (ctx->scaler.enabled)
-		fimc_hw_start_scaler(fimc);
-	fimc_hw_en_capture(ctx);
-
 	ctx->state = 0;
-	fimc_hw_start_in_dma(fimc);
+	fimc_activate_capture(ctx);
 
-	fimc->m2m.ctx = ctx;
+	fimc_hw_activate_input_dma(fimc, true);
 
 dma_unlock:
 	spin_unlock_irqrestore(&ctx->slock, flags);
@@ -560,7 +541,7 @@ static int fimc_buf_setup(struct videobuf_queue *vq, unsigned int *count,
 	struct fimc_ctx *ctx = vq->priv_data;
 	struct fimc_frame *frame;
 
-	frame = ctx_m2m_get_frame(ctx, vq->type);
+	frame = ctx_get_frame(ctx, vq->type);
 	if (IS_ERR(frame))
 		return PTR_ERR(frame);
 
@@ -578,7 +559,7 @@ static int fimc_buf_prepare(struct videobuf_queue *vq,
 	struct fimc_frame *frame;
 	int ret;
 
-	frame = ctx_m2m_get_frame(ctx, vq->type);
+	frame = ctx_get_frame(ctx, vq->type);
 	if (IS_ERR(frame))
 		return PTR_ERR(frame);
 
@@ -663,7 +644,7 @@ static int fimc_m2m_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
 	struct fimc_ctx *ctx = priv;
 	struct fimc_frame *frame;
 
-	frame = ctx_m2m_get_frame(ctx, f->type);
+	frame = ctx_get_frame(ctx, f->type);
 	if (IS_ERR(frame))
 		return PTR_ERR(frame);
 
@@ -999,7 +980,7 @@ static int fimc_m2m_cropcap(struct file *file, void *fh,
 	struct fimc_frame *frame;
 	struct fimc_ctx *ctx = fh;
 
-	frame = ctx_m2m_get_frame(ctx, cr->type);
+	frame = ctx_get_frame(ctx, cr->type);
 	if (IS_ERR(frame))
 		return PTR_ERR(frame);
 
@@ -1019,7 +1000,7 @@ static int fimc_m2m_g_crop(struct file *file, void *fh, struct v4l2_crop *cr)
 	struct fimc_frame *frame;
 	struct fimc_ctx *ctx = file->private_data;
 
-	frame = ctx_m2m_get_frame(ctx, cr->type);
+	frame = ctx_get_frame(ctx, cr->type);
 	if (IS_ERR(frame))
 		return PTR_ERR(frame);
 
@@ -1052,7 +1033,7 @@ static int fimc_m2m_s_crop(struct file *file, void *fh, struct v4l2_crop *cr)
 		return -EINVAL;
 	}
 
-	f = ctx_m2m_get_frame(ctx, cr->type);
+	f = ctx_get_frame(ctx, cr->type);
 	if (IS_ERR(f))
 		return PTR_ERR(f);
 
@@ -1136,7 +1117,7 @@ static void queue_init(void *priv, struct videobuf_queue *vq,
 	struct fimc_dev *fimc = ctx->fimc_dev;
 
 	videobuf_queue_dma_contig_init(vq, &fimc_qops,
-		fimc->m2m.v4l2_dev.dev,
+		&fimc->pdev->dev,
 		&fimc->irqlock, type, V4L2_FIELD_NONE,
 		sizeof(struct fimc_vid_buffer), priv, NULL);
 }
@@ -1159,13 +1140,12 @@ static int fimc_m2m_open(struct file *file)
 
 	file->private_data = ctx;
 	ctx->fimc_dev = fimc;
-	/* default format */
+	/* Default color format */
 	ctx->s_frame.fmt = &fimc_formats[0];
 	ctx->d_frame.fmt = &fimc_formats[0];
 	/* per user process device context initialization */
 	ctx->state = 0;
 	ctx->flags = 0;
-	ctx->effect.type = S5P_FIMC_EFFECT_ORIGINAL;
 	ctx->in_path = FIMC_DMA;
 	ctx->out_path = FIMC_DMA;
 	spin_lock_init(&ctx->slock);
@@ -1241,7 +1221,7 @@ static int fimc_register_m2m_device(struct fimc_dev *fimc)
 
 	ret = v4l2_device_register(&pdev->dev, v4l2_dev);
 	if (ret)
-		return ret;;
+		goto err_m2m_r1;
 
 	vfd = video_device_alloc();
 	if (!vfd) {
@@ -1293,7 +1273,7 @@ static void fimc_unregister_m2m_device(struct fimc_dev *fimc)
 	if (fimc) {
 		v4l2_m2m_release(fimc->m2m.m2m_dev);
 		video_unregister_device(fimc->m2m.vfd);
-		video_device_release(fimc->m2m.vfd);
+
 		v4l2_device_unregister(&fimc->m2m.v4l2_dev);
 	}
 }
@@ -1399,25 +1379,15 @@ static int fimc_probe(struct platform_device *pdev)
 		goto err_clk;
 	}
 
-	fimc->work_queue = create_workqueue(dev_name(&fimc->pdev->dev));
-	if (!fimc->work_queue) {
-		ret = -ENOMEM;
-		goto err_irq;
-	}
-
 	ret = fimc_register_m2m_device(fimc);
 	if (ret)
-		goto err_wq;
-
-	fimc_hw_en_lastirq(fimc, true);
+		goto err_irq;
 
 	dev_dbg(&pdev->dev, "%s(): fimc-%d registered successfully\n",
 		__func__, fimc->id);
 
 	return 0;
 
-err_wq:
-	destroy_workqueue(fimc->work_queue);
 err_irq:
 	free_irq(fimc->irq, fimc);
 err_clk:
@@ -1429,7 +1399,7 @@ err_req_region:
 	kfree(fimc->regs_res);
 err_info:
 	kfree(fimc);
-	dev_err(&pdev->dev, "failed to install\n");
+
 	return ret;
 }
 
@@ -1438,10 +1408,7 @@ static int __devexit fimc_remove(struct platform_device *pdev)
 	struct fimc_dev *fimc =
 		(struct fimc_dev *)platform_get_drvdata(pdev);
 
-	v4l2_info(&fimc->m2m.v4l2_dev, "Removing %s\n", pdev->name);
-
 	free_irq(fimc->irq, fimc);
-
 	fimc_hw_reset(fimc);
 
 	fimc_unregister_m2m_device(fimc);
@@ -1450,6 +1417,8 @@ static int __devexit fimc_remove(struct platform_device *pdev)
 	release_resource(fimc->regs_res);
 	kfree(fimc->regs_res);
 	kfree(fimc);
+
+	dev_info(&pdev->dev, "%s driver unloaded\n", pdev->name);
 	return 0;
 }
 
@@ -1484,7 +1453,7 @@ static struct samsung_fimc_variant fimc01_variant_s5pv210 = {
 	.has_inp_rot	= 1,
 	.has_out_rot	= 1,
 	.min_inp_pixsize = 16,
-	.min_out_pixsize = 32,
+	.min_out_pixsize = 16,
 
 	.scaler_en_w	= 4224,
 	.scaler_dis_w	= 8192,
@@ -1497,7 +1466,7 @@ static struct samsung_fimc_variant fimc01_variant_s5pv210 = {
 static struct samsung_fimc_variant fimc2_variant_s5pv210 = {
 	.pix_hoff	 = 1,
 	.min_inp_pixsize = 16,
-	.min_out_pixsize = 32,
+	.min_out_pixsize = 16,
 
 	.scaler_en_w	= 1920,
 	.scaler_dis_w	= 8192,
@@ -1547,20 +1516,12 @@ static struct platform_driver fimc_driver = {
 	}
 };
 
-static char banner[] __initdata = KERN_INFO
-	"S5PC Camera Interface V4L2 Driver, (c) 2010 Samsung Electronics\n";
-
 static int __init fimc_init(void)
 {
-	u32 ret;
-	printk(banner);
-
-	ret = platform_driver_register(&fimc_driver);
-	if (ret) {
-		printk(KERN_ERR "FIMC platform driver register failed\n");
-		return -1;
-	}
-	return 0;
+	int ret = platform_driver_register(&fimc_driver);
+	if (ret)
+		err("platform_driver_register failed: %d\n", ret);
+	return ret;
 }
 
 static void __exit fimc_exit(void)
diff --git a/drivers/media/video/s5p-fimc/fimc-core.h b/drivers/media/video/s5p-fimc/fimc-core.h
index 6b3e0cd73cdd..5aeb3efbd457 100644
--- a/drivers/media/video/s5p-fimc/fimc-core.h
+++ b/drivers/media/video/s5p-fimc/fimc-core.h
@@ -34,6 +34,7 @@
 #define FIMC_MAX_OUT_BUFS	4
 #define SCALER_MAX_HRATIO	64
 #define SCALER_MAX_VRATIO	64
+#define DMA_MIN_SIZE		8
 
 enum {
 	ST_IDLE,
@@ -54,21 +55,21 @@ enum fimc_datapath {
 };
 
 enum fimc_color_fmt {
-	S5P_FIMC_RGB565,
+	S5P_FIMC_RGB565 = 0x10,
 	S5P_FIMC_RGB666,
 	S5P_FIMC_RGB888,
-	S5P_FIMC_YCBCR420,
+	S5P_FIMC_RGB30_LOCAL,
+	S5P_FIMC_YCBCR420 = 0x20,
 	S5P_FIMC_YCBCR422,
 	S5P_FIMC_YCBYCR422,
 	S5P_FIMC_YCRYCB422,
 	S5P_FIMC_CBYCRY422,
 	S5P_FIMC_CRYCBY422,
-	S5P_FIMC_RGB30_LOCAL,
 	S5P_FIMC_YCBCR444_LOCAL,
-	S5P_FIMC_MAX_COLOR = S5P_FIMC_YCBCR444_LOCAL,
-	S5P_FIMC_COLOR_MASK = 0x0F,
 };
 
+#define fimc_fmt_is_rgb(x) ((x) & 0x10)
+
 /* Y/Cb/Cr components order at DMA output for 1 plane YCbCr 4:2:2 formats. */
 #define	S5P_FIMC_OUT_CRYCBY	S5P_CIOCTRL_ORDER422_CRYCBY
 #define	S5P_FIMC_OUT_CBYCRY	S5P_CIOCTRL_ORDER422_YCRYCB
@@ -93,11 +94,13 @@ enum fimc_color_fmt {
 #define	S5P_FIMC_EFFECT_SIKHOUETTE	S5P_CIIMGEFF_FIN_SILHOUETTE
 
 /* The hardware context state. */
-#define	FIMC_PARAMS			(1 << 0)
-#define	FIMC_SRC_ADDR			(1 << 1)
-#define	FIMC_DST_ADDR			(1 << 2)
-#define	FIMC_SRC_FMT			(1 << 3)
-#define	FIMC_DST_FMT			(1 << 4)
+#define	FIMC_PARAMS		(1 << 0)
+#define	FIMC_SRC_ADDR		(1 << 1)
+#define	FIMC_DST_ADDR		(1 << 2)
+#define	FIMC_SRC_FMT		(1 << 3)
+#define	FIMC_DST_FMT		(1 << 4)
+#define	FIMC_CTX_M2M		(1 << 5)
+#define	FIMC_CTX_CAP		(1 << 6)
 
 /* Image conversion flags */
 #define	FIMC_IN_DMA_ACCESS_TILED	(1 << 0)
@@ -106,7 +109,9 @@ enum fimc_color_fmt {
 #define	FIMC_OUT_DMA_ACCESS_LINEAR	(0 << 1)
 #define	FIMC_SCAN_MODE_PROGRESSIVE	(0 << 2)
 #define	FIMC_SCAN_MODE_INTERLACED	(1 << 2)
-/* YCbCr data dynamic range for RGB-YUV color conversion. Y/Cb/Cr: (0 ~ 255) */
+/*
+ * YCbCr data dynamic range for RGB-YUV color conversion.
+ * Y/Cb/Cr: (0 ~ 255) */
 #define	FIMC_COLOR_RANGE_WIDE		(0 << 3)
 /* Y (16 ~ 235), Cb/Cr (16 ~ 240) */
 #define	FIMC_COLOR_RANGE_NARROW		(1 << 3)
@@ -167,37 +172,37 @@ struct fimc_effect {
 /**
  * struct fimc_scaler - the configuration data for FIMC inetrnal scaler
  *
- * @enabled:		the flag set when the scaler is used
+ * @scaleup_h:		flag indicating scaling up horizontally
+ * @scaleup_v:		flag indicating scaling up vertically
+ * @copy_mode:		flag indicating transparent DMA transfer (no scaling
+ *			and color format conversion)
+ * @enabled:		flag indicating if the scaler is used
  * @hfactor:		horizontal shift factor
  * @vfactor:		vertical shift factor
  * @pre_hratio:		horizontal ratio of the prescaler
  * @pre_vratio:		vertical ratio of the prescaler
  * @pre_dst_width:	the prescaler's destination width
  * @pre_dst_height:	the prescaler's destination height
- * @scaleup_h:		flag indicating scaling up horizontally
- * @scaleup_v:		flag indicating scaling up vertically
  * @main_hratio:	the main scaler's horizontal ratio
  * @main_vratio:	the main scaler's vertical ratio
- * @real_width:		source width - offset
- * @real_height:	source height - offset
- * @copy_mode:		flag set if one-to-one mode is used, i.e. no scaling
- *			and color format conversion
+ * @real_width:		source pixel (width - offset)
+ * @real_height:	source pixel (height - offset)
  */
 struct fimc_scaler {
-	u32	enabled;
+	int	scaleup_h:1;
+	int	scaleup_v:1;
+	int	copy_mode:1;
+	int	enabled:1;
 	u32	hfactor;
 	u32	vfactor;
 	u32	pre_hratio;
 	u32	pre_vratio;
 	u32	pre_dst_width;
 	u32	pre_dst_height;
-	u32	scaleup_h;
-	u32	scaleup_v;
 	u32	main_hratio;
 	u32	main_vratio;
 	u32	real_width;
 	u32	real_height;
-	u32	copy_mode;
 };
 
 /**
@@ -222,8 +227,7 @@ struct fimc_vid_buffer {
 };
 
 /**
- * struct fimc_frame - input/output frame format properties
- *
+ * struct fimc_frame - source/target frame properties
  * @f_width:	image full width (virtual screen size)
  * @f_height:	image full height (virtual screen size)
  * @o_width:	original image width as set by S_FMT
@@ -279,10 +283,10 @@ struct fimc_m2m_device {
  * @min_out_pixsize: minimum output pixel size
  * @scaler_en_w: maximum input pixel width when the scaler is enabled
  * @scaler_dis_w: maximum input pixel width when the scaler is disabled
- * @in_rot_en_h: maximum input width when the input rotator is used
- * @in_rot_dis_w: maximum input width when the input rotator is used
- * @out_rot_en_w: maximum output width for the output rotator enabled
- * @out_rot_dis_w: maximum output width for the output rotator enabled
+ * @in_rot_en_h: maximum input width when the input rotator is enabled
+ * @in_rot_dis_w: maximum input width when the input rotator is disabled
+ * @out_rot_en_w: maximum target width when the output rotator enabled
+ * @out_rot_dis_w: maximum target width when the output rotator disnabled
  */
 struct samsung_fimc_variant {
 	unsigned int	pix_hoff:1;
@@ -300,7 +304,7 @@ struct samsung_fimc_variant {
 };
 
 /**
- * struct samsung_fimc_driverdata - per-device type driver data for init time.
+ * struct samsung_fimc_driverdata - per device type driver data for init time.
  *
  * @variant: the variant information for this driver.
  * @dev_cnt: number of fimc sub-devices available in SoC
@@ -313,7 +317,7 @@ struct samsung_fimc_driverdata {
 struct fimc_ctx;
 
 /**
- * struct fimc_subdev - abstraction for a FIMC entity
+ * struct fimc_dev - abstraction for FIMC entity
  *
  * @slock:	the spinlock protecting this data structure
  * @lock:	the mutex protecting this data structure
@@ -323,7 +327,7 @@ struct fimc_ctx;
  * @regs:	the mapped hardware registers
  * @regs_res:	the resource claimed for IO registers
  * @irq:	interrupt number of the FIMC subdevice
- * @irqlock:	spinlock protecting videbuffer queue
+ * @irqlock:	spinlock protecting videobuffer queue
  * @m2m:	memory-to-memory V4L2 device information
  * @state:	the FIMC device state flags
  */
@@ -338,7 +342,6 @@ struct fimc_dev {
 	struct resource			*regs_res;
 	int				irq;
 	spinlock_t			irqlock;
-	struct workqueue_struct		*work_queue;
 	struct fimc_m2m_device		m2m;
 	unsigned long			state;
 };
@@ -359,7 +362,7 @@ struct fimc_dev {
  * @effect:		image effect
  * @rotation:		image clockwise rotation in degrees
  * @flip:		image flip mode
- * @flags:		an additional flags for image conversion
+ * @flags:		additional flags for image conversion
  * @state:		flags to keep track of user configuration
  * @fimc_dev:		the FIMC device this context applies to
  * @m2m_ctx:		memory-to-memory device context
@@ -397,18 +400,24 @@ static inline void fimc_hw_clear_irq(struct fimc_dev *dev)
 	writel(cfg, dev->regs + S5P_CIGCTRL);
 }
 
-static inline void fimc_hw_start_scaler(struct fimc_dev *dev)
+static inline void fimc_hw_enable_scaler(struct fimc_dev *dev, bool on)
 {
 	u32 cfg = readl(dev->regs + S5P_CISCCTRL);
-	cfg |= S5P_CISCCTRL_SCALERSTART;
+	if (on)
+		cfg |= S5P_CISCCTRL_SCALERSTART;
+	else
+		cfg &= ~S5P_CISCCTRL_SCALERSTART;
 	writel(cfg, dev->regs + S5P_CISCCTRL);
 }
 
-static inline void fimc_hw_stop_scaler(struct fimc_dev *dev)
+static inline void fimc_hw_activate_input_dma(struct fimc_dev *dev, bool on)
 {
-	u32 cfg = readl(dev->regs + S5P_CISCCTRL);
-	cfg &= ~S5P_CISCCTRL_SCALERSTART;
-	writel(cfg, dev->regs + S5P_CISCCTRL);
+	u32 cfg = readl(dev->regs + S5P_MSCTRL);
+	if (on)
+		cfg |= S5P_MSCTRL_ENVID;
+	else
+		cfg &= ~S5P_MSCTRL_ENVID;
+	writel(cfg, dev->regs + S5P_MSCTRL);
 }
 
 static inline void fimc_hw_dis_capture(struct fimc_dev *dev)
@@ -418,22 +427,8 @@ static inline void fimc_hw_dis_capture(struct fimc_dev *dev)
 	writel(cfg, dev->regs + S5P_CIIMGCPT);
 }
 
-static inline void fimc_hw_start_in_dma(struct fimc_dev *dev)
-{
-	u32 cfg = readl(dev->regs + S5P_MSCTRL);
-	cfg |= S5P_MSCTRL_ENVID;
-	writel(cfg, dev->regs + S5P_MSCTRL);
-}
-
-static inline void fimc_hw_stop_in_dma(struct fimc_dev *dev)
-{
-	u32 cfg = readl(dev->regs + S5P_MSCTRL);
-	cfg &= ~S5P_MSCTRL_ENVID;
-	writel(cfg, dev->regs + S5P_MSCTRL);
-}
-
-static inline struct fimc_frame *ctx_m2m_get_frame(struct fimc_ctx *ctx,
-						   enum v4l2_buf_type type)
+static inline struct fimc_frame *ctx_get_frame(struct fimc_ctx *ctx,
+					       enum v4l2_buf_type type)
 {
 	struct fimc_frame *frame;
 
@@ -452,20 +447,35 @@ static inline struct fimc_frame *ctx_m2m_get_frame(struct fimc_ctx *ctx,
 
 /* -----------------------------------------------------*/
 /* fimc-reg.c						*/
-void fimc_hw_reset(struct fimc_dev *dev);
+void fimc_hw_reset(struct fimc_dev *fimc);
 void fimc_hw_set_rotation(struct fimc_ctx *ctx);
 void fimc_hw_set_target_format(struct fimc_ctx *ctx);
 void fimc_hw_set_out_dma(struct fimc_ctx *ctx);
-void fimc_hw_en_lastirq(struct fimc_dev *dev, int enable);
-void fimc_hw_en_irq(struct fimc_dev *dev, int enable);
-void fimc_hw_set_prescaler(struct fimc_ctx *ctx);
+void fimc_hw_en_lastirq(struct fimc_dev *fimc, int enable);
+void fimc_hw_en_irq(struct fimc_dev *fimc, int enable);
 void fimc_hw_set_scaler(struct fimc_ctx *ctx);
 void fimc_hw_en_capture(struct fimc_ctx *ctx);
 void fimc_hw_set_effect(struct fimc_ctx *ctx);
 void fimc_hw_set_in_dma(struct fimc_ctx *ctx);
 void fimc_hw_set_input_path(struct fimc_ctx *ctx);
 void fimc_hw_set_output_path(struct fimc_ctx *ctx);
-void fimc_hw_set_input_addr(struct fimc_dev *dev, struct fimc_addr *paddr);
-void fimc_hw_set_output_addr(struct fimc_dev *dev, struct fimc_addr *paddr);
+void fimc_hw_set_input_addr(struct fimc_dev *fimc, struct fimc_addr *paddr);
+void fimc_hw_set_output_addr(struct fimc_dev *fimc, struct fimc_addr *paddr,
+			      int index);
+
+/* Locking: the caller holds fimc->slock */
+static inline void fimc_activate_capture(struct fimc_ctx *ctx)
+{
+	fimc_hw_enable_scaler(ctx->fimc_dev, ctx->scaler.enabled);
+	fimc_hw_en_capture(ctx);
+}
+
+static inline void fimc_deactivate_capture(struct fimc_dev *fimc)
+{
+	fimc_hw_en_lastirq(fimc, true);
+	fimc_hw_dis_capture(fimc);
+	fimc_hw_enable_scaler(fimc, false);
+	fimc_hw_en_lastirq(fimc, false);
+}
 
 #endif /* FIMC_CORE_H_ */
diff --git a/drivers/media/video/s5p-fimc/fimc-reg.c b/drivers/media/video/s5p-fimc/fimc-reg.c
index 70f29c5a6d10..94e98d47a7d0 100644
--- a/drivers/media/video/s5p-fimc/fimc-reg.c
+++ b/drivers/media/video/s5p-fimc/fimc-reg.c
@@ -29,7 +29,7 @@ void fimc_hw_reset(struct fimc_dev *dev)
 	cfg = readl(dev->regs + S5P_CIGCTRL);
 	cfg |= (S5P_CIGCTRL_SWRST | S5P_CIGCTRL_IRQ_LEVEL);
 	writel(cfg, dev->regs + S5P_CIGCTRL);
-	msleep(1);
+	udelay(1000);
 
 	cfg = readl(dev->regs + S5P_CIGCTRL);
 	cfg &= ~S5P_CIGCTRL_SWRST;
@@ -247,21 +247,20 @@ void fimc_hw_en_lastirq(struct fimc_dev *dev, int enable)
 	spin_unlock_irqrestore(&dev->slock, flags);
 }
 
-void fimc_hw_set_prescaler(struct fimc_ctx *ctx)
+static void fimc_hw_set_prescaler(struct fimc_ctx *ctx)
 {
 	struct fimc_dev *dev =  ctx->fimc_dev;
 	struct fimc_scaler *sc = &ctx->scaler;
-	u32 cfg = 0, shfactor;
+	u32 cfg, shfactor;
 
 	shfactor = 10 - (sc->hfactor + sc->vfactor);
 
-	cfg |= S5P_CISCPRERATIO_SHFACTOR(shfactor);
+	cfg = S5P_CISCPRERATIO_SHFACTOR(shfactor);
 	cfg |= S5P_CISCPRERATIO_HOR(sc->pre_hratio);
 	cfg |= S5P_CISCPRERATIO_VER(sc->pre_vratio);
 	writel(cfg, dev->regs + S5P_CISCPRERATIO);
 
-	cfg = 0;
-	cfg |= S5P_CISCPREDST_WIDTH(sc->pre_dst_width);
+	cfg = S5P_CISCPREDST_WIDTH(sc->pre_dst_width);
 	cfg |= S5P_CISCPREDST_HEIGHT(sc->pre_dst_height);
 	writel(cfg, dev->regs + S5P_CISCPREDST);
 }
@@ -274,6 +273,8 @@ void fimc_hw_set_scaler(struct fimc_ctx *ctx)
 	struct fimc_frame *dst_frame = &ctx->d_frame;
 	u32 cfg = 0;
 
+	fimc_hw_set_prescaler(ctx);
+
 	if (!(ctx->flags & FIMC_COLOR_RANGE_NARROW))
 		cfg |= (S5P_CISCCTRL_CSCR2Y_WIDE | S5P_CISCCTRL_CSCY2R_WIDE);
 
@@ -364,7 +365,7 @@ static void fimc_hw_set_in_dma_size(struct fimc_ctx *ctx)
 	u32 cfg_r = 0;
 
 	if (FIMC_LCDFIFO == ctx->out_path)
-		cfg_r |=  S5P_CIREAL_ISIZE_AUTOLOAD_EN;
+		cfg_r |= S5P_CIREAL_ISIZE_AUTOLOAD_EN;
 
 	cfg_o |= S5P_ORIG_SIZE_HOR(frame->f_width);
 	cfg_o |= S5P_ORIG_SIZE_VER(frame->f_height);
@@ -380,27 +381,25 @@ void fimc_hw_set_in_dma(struct fimc_ctx *ctx)
 	struct fimc_dev *dev = ctx->fimc_dev;
 	struct fimc_frame *frame = &ctx->s_frame;
 	struct fimc_dma_offset *offset = &frame->dma_offset;
-	u32 cfg = 0;
+	u32 cfg;
 
 	/* Set the pixel offsets. */
-	cfg |= S5P_CIO_OFFS_HOR(offset->y_h);
+	cfg = S5P_CIO_OFFS_HOR(offset->y_h);
 	cfg |= S5P_CIO_OFFS_VER(offset->y_v);
 	writel(cfg, dev->regs + S5P_CIIYOFF);
 
-	cfg = 0;
-	cfg |= S5P_CIO_OFFS_HOR(offset->cb_h);
+	cfg = S5P_CIO_OFFS_HOR(offset->cb_h);
 	cfg |= S5P_CIO_OFFS_VER(offset->cb_v);
 	writel(cfg, dev->regs + S5P_CIICBOFF);
 
-	cfg = 0;
-	cfg |= S5P_CIO_OFFS_HOR(offset->cr_h);
+	cfg = S5P_CIO_OFFS_HOR(offset->cr_h);
 	cfg |= S5P_CIO_OFFS_VER(offset->cr_v);
 	writel(cfg, dev->regs + S5P_CIICROFF);
 
 	/* Input original and real size. */
 	fimc_hw_set_in_dma_size(ctx);
 
-	/* Autoload is used currently only in FIFO mode. */
+	/* Use DMA autoload only in FIFO mode. */
 	fimc_hw_en_autoload(dev, ctx->out_path == FIMC_LCDFIFO);
 
 	/* Set the input DMA to process single frame only. */
@@ -501,9 +500,7 @@ void fimc_hw_set_output_path(struct fimc_ctx *ctx)
 
 void fimc_hw_set_input_addr(struct fimc_dev *dev, struct fimc_addr *paddr)
 {
-	u32 cfg = 0;
-
-	cfg = readl(dev->regs + S5P_CIREAL_ISIZE);
+	u32 cfg = readl(dev->regs + S5P_CIREAL_ISIZE);
 	cfg |= S5P_CIREAL_ISIZE_ADDR_CH_DIS;
 	writel(cfg, dev->regs + S5P_CIREAL_ISIZE);
 
@@ -515,13 +512,15 @@ void fimc_hw_set_input_addr(struct fimc_dev *dev, struct fimc_addr *paddr)
 	writel(cfg, dev->regs + S5P_CIREAL_ISIZE);
 }
 
-void fimc_hw_set_output_addr(struct fimc_dev *dev, struct fimc_addr *paddr)
+void fimc_hw_set_output_addr(struct fimc_dev *dev,
+			     struct fimc_addr *paddr, int index)
 {
-	int i;
-	/* Set all the output register sets to point to single video buffer. */
-	for (i = 0; i < FIMC_MAX_OUT_BUFS; i++) {
+	int i = (index == -1) ? 0 : index;
+	do {
 		writel(paddr->y, dev->regs + S5P_CIOYSA(i));
 		writel(paddr->cb, dev->regs + S5P_CIOCBSA(i));
 		writel(paddr->cr, dev->regs + S5P_CIOCRSA(i));
-	}
+		dbg("dst_buf[%d]: 0x%X, cb: 0x%X, cr: 0x%X",
+		    i, paddr->y, paddr->cb, paddr->cr);
+	} while (index == -1 && ++i < FIMC_MAX_OUT_BUFS);
 }