Commit 5f78f7e7 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

media: vim2m: speedup passthrough copy 



When in passthrough mode, copy the entire line at once, in
order to make it faster (if not HFLIP).

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent f9729920

drivers/media/platform/vim2m.c

+17 −20
Original line number Diff line number Diff line
@@ -267,26 +267,23 @@ static const char *type_name(enum v4l2_buf_type type) 
#define CLIP(__color) \

	(u8)(((__color) > 0xff) ? 0xff : (((__color) < 0) ? 0 : (__color)))



static void fast_copy_two_pixels(struct vim2m_q_data *q_data_in,

				 struct vim2m_q_data *q_data_out,

				 u8 **src, u8 **dst, bool reverse)

static void copy_line(struct vim2m_q_data *q_data_out,

		      u8 *src, u8 *dst, bool reverse)

{

	int depth = q_data_out->fmt->depth >> 3;

	int x, depth = q_data_out->fmt->depth >> 3;



	if (!reverse) {

		memcpy(*dst, *src, depth << 1);

		*src += depth << 1;

		*dst += depth << 1;

		return;

		memcpy(dst, src, q_data_out->width * depth);

	} else {

		for (x = 0; x < q_data_out->width >> 1; x++) {

			memcpy(dst, src, depth);

			memcpy(dst + depth, src - depth, depth);

			src -= depth << 1;

			dst += depth << 1;

		}



	/* copy RGB formats in reverse order */

	memcpy(*dst, *src, depth);

	memcpy(*dst + depth, *src - depth, depth);

	*src -= depth << 1;

	*dst += depth << 1;

		return;

	}

}



static void copy_two_pixels(struct vim2m_q_data *q_data_in,

			    struct vim2m_q_data *q_data_out,
@@ -487,7 +484,7 @@ static int device_process(struct vim2m_ctx *ctx, 
	}

	y_out = 0;



	/* Faster copy logic,  when format and resolution are identical */

	/* When format and resolution are identical, we can use a faster copy logic */

	if (q_data_in->fmt->fourcc == q_data_out->fmt->fourcc &&

	    q_data_in->width == q_data_out->width &&

	    q_data_in->height == q_data_out->height) {
@@ -496,15 +493,15 @@ static int device_process(struct vim2m_ctx *ctx, 
			if (ctx->mode & MEM2MEM_HFLIP)

				p += bytesperline - (q_data_in->fmt->depth >> 3);



			for (x = 0; x < width >> 1; x++)

				fast_copy_two_pixels(q_data_in, q_data_out,

						     &p, &p_out,

			copy_line(q_data_out, p, p_out,

				  ctx->mode & MEM2MEM_HFLIP);



			p_out += bytesperline;

		}

		return 0;

	}



	/* Slower algorithm with format conversion and scaler */

	/* Slower algorithm with format conversion, hflip, vflip and scaler */



	/* To speed scaler up, use Bresenham for X dimension */

	x_int = q_data_in->width / q_data_out->width;