From 442a43f50fac8ce13f1b43ca7c5f54af6f91c65e Mon Sep 17 00:00:00 2001 From: Antonio Ospite Date: Wed, 3 Dec 2008 16:21:08 -0300 Subject: V4L/DVB (9857): gspca: Use smaller chunks for urb buffer in ov534. Signed-off-by: Antonio Ospite Signed-off-by: Jean-Francois Moine Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/gspca/ov534.c | 46 +++++++++++++++++++++++++-------------- 1 file changed, 30 insertions(+), 16 deletions(-) diff --git a/drivers/media/video/gspca/ov534.c b/drivers/media/video/gspca/ov534.c index 530f0b71216..a1c31bc53a3 100644 --- a/drivers/media/video/gspca/ov534.c +++ b/drivers/media/video/gspca/ov534.c @@ -346,7 +346,14 @@ static int sd_config(struct gspca_dev *gspca_dev, cam->cam_mode = vga_mode; cam->nmodes = ARRAY_SIZE(vga_mode); - cam->bulk_size = vga_mode[0].sizeimage; + /* + * On some architectures we need contiguous memory for urb buffers, and + * in low memory situation 'sizeimage' can be too much. + * 16kiB chunks should be available even when we are low in memory. + * TODO: CHECK this description: is the problem arch-dependent or more + * general? + */ + cam->bulk_size = 16 * 1024; cam->bulk_nurbs = 2; PDEBUG(D_PROBE, "bulk_size = %d", cam->bulk_size); @@ -395,15 +402,19 @@ static int sd_init(struct gspca_dev *gspca_dev) static int sd_start(struct gspca_dev *gspca_dev) { - PDEBUG(D_PROBE, "width = %d, height = %d", - gspca_dev->width, gspca_dev->height); - - gspca_dev->cam.bulk_size = gspca_dev->width * gspca_dev->height * 2; + struct gspca_frame *frame; /* start streaming data */ ov534_set_led(gspca_dev->dev, 1); ov534_reg_write(gspca_dev->dev, 0xe0, 0x00); + frame = gspca_get_i_frame(gspca_dev); + if (frame == NULL) { + PDEBUG(D_ERR, "NULL frame!"); + return -1; + } + gspca_frame_add(gspca_dev, FIRST_PACKET, frame, gspca_dev->usb_buf, 0); + return 0; } @@ -421,18 +432,21 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, struct gspca_frame *frame, * The current camera setup doesn't stream the last pixel, so we set it * to a dummy value */ - __u8 last_pixel[4] = { 0, 0, 0, 0 }; - int framesize = gspca_dev->cam.bulk_size; - - if (len == framesize - 4) { - frame = - gspca_frame_add(gspca_dev, FIRST_PACKET, frame, data, len); - frame = - gspca_frame_add(gspca_dev, LAST_PACKET, frame, last_pixel, - 4); + __u8 last[4] = { 0, 0, 0, 0 }; + int framesize = frame->v4l2_buf.length; + + PDEBUG(D_PACK, ""); + PDEBUG(D_PACK, "** packet len = %d, framesize = %d", len, framesize); + PDEBUG(D_PACK, "** frame->data_end - frame->data + len = %d", + frame->data_end - frame->data + len); + + if (frame->data_end - frame->data + len == framesize - 4) { + PDEBUG(D_PACK, " end of frame!"); + gspca_frame_add(gspca_dev, INTER_PACKET, frame, data, len); + frame = gspca_frame_add(gspca_dev, LAST_PACKET, frame, last, 4); + gspca_frame_add(gspca_dev, FIRST_PACKET, frame, data, 0); } else - PDEBUG(D_PACK, "packet len = %d, framesize = %d", len, - framesize); + gspca_frame_add(gspca_dev, INTER_PACKET, frame, data, len); } /* sub-driver description */ -- cgit v1.2.3